10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

(Mark One)
☑	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2021.

or
☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period from          to          .

Commission File Number: 001-13831

Quanta Services, Inc.

(Exact name of registrant as specified in its charter)

Delaware	74-2851603
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

2800 Post Oak Boulevard, Suite 2600

Houston, Texas 77056

(Address of principal executive offices, including zip code)

(713) 629-7600

(Registrant’s telephone number, including area code)

N/A

(Former name, former address and former fiscal year, if changed since last report)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, $0.00001 par value	PWR	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes ☑    No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).  Yes ☑     No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☑	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes ☐     No ☑

As of November 2, 2021, the number of outstanding shares of Common Stock of the registrant was 142,499,280.

QUANTA SERVICES, INC. AND SUBSIDIARIES

INDEX

		Page
	PART I. FINANCIAL INFORMATION
ITEM 1.	Financial Statements (Unaudited)
	Condensed Consolidated Balance Sheets	5
	Condensed Consolidated Statements of Operations	6
	Condensed Consolidated Statements of Comprehensive Income (Loss)	7
	Condensed Consolidated Statements of Cash Flows	8
	Condensed Consolidated Statements of Equity	9
	Notes to Condensed Consolidated Financial Statements	11
ITEM 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	43
ITEM 3.	Quantitative and Qualitative Disclosures About Market Risk	67
ITEM 4.	Controls and Procedures	68
	PART II. OTHER INFORMATION
ITEM 1.	Legal Proceedings	70
ITEM 1A.	Risk Factors	70
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds	72
ITEM 3.	Defaults Upon Senior Securities	72
ITEM 4.	Mine Safety Disclosures	72
ITEM 5.	Other Information	73
ITEM 6.	Exhibits	74
Signature		75

Cautionary Statement About Forward-Looking Statements and Information

This Quarterly Report on Form 10-Q (Quarterly Report) of Quanta Services, Inc. (together with its subsidiaries, Quanta, we, us or our) includes forward-looking statements reflecting assumptions, expectations, projections, intentions or beliefs about future events that are intended to qualify for the “safe harbor” from liability established by the Private Securities Litigation Reform Act of 1995. You can identify these statements by the fact that they do not relate strictly to historical or current facts. They use words such as “anticipate,” “estimate,” “project,” “forecast,” “may,” “will,” “should,” “could,” “expect,” “believe,” “plan,” “intend” and other words of similar meaning. In particular, these include, but are not limited to, statements relating to the following:

•Projected revenues, net income, earnings per share, margins, cash flows, liquidity, weighted average shares outstanding, capital expenditures and tax rates, as well as other projections of operating and GAAP (as defined below) and non-GAAP financial results;

•Expectations regarding our business or financial outlook;

•Expectations regarding opportunities, technological developments, competitive positioning, future economic and regulatory conditions and other trends in particular markets or industries, including with respect to our increased operations in the renewable energy market after our acquisition of Blattner (as defined below);

•Expectations regarding the pandemic associated with the novel coronavirus disease that began in 2019 (COVID-19), including the continued and potential impact of the COVID-19 pandemic and of governmental responses to the pandemic (including, among other things, implementation of vaccination and testing requirements) on our business, operations, supply chain, personnel, financial condition, results of operations, cash flows and liquidity;

•Expectations regarding our plans and strategies;

•The business plans or financial condition of our customers, including with respect to the COVID-19 pandemic and the transition to a carbon-neutral economy;

•The potential impact of commodity prices and production volumes on our business, financial condition, results of operations, cash flows and demand for our services;

•The potential benefits from, and future financial and operational performance of, acquired businesses and our investments, including Blattner and our equity interest in LUMA (as defined below);

•Beliefs and assumptions about the collectability of receivables;

•The expected value of contracts or intended contracts with customers, as well as the scope, services, term or results of any awarded or expected projects;

•The development of and opportunities with respect to future projects, including renewable energy projects and larger electric transmission and pipeline projects;

•Future capital allocation initiatives, including the amount and timing of, and strategies with respect to, any future stock repurchases and expectations regarding the declaration, amount and timing of any future cash dividends;

•The impact of existing or potential legislation or regulation;

•Potential opportunities that may be indicated by bidding activity or similar discussions with customers;

•The future demand for, availability of and costs related to labor resources in the industries we serve;

•The expected realization of our remaining performance obligations or backlog;

•The expected outcome of pending or threatened legal proceedings;

•Expectations with respect to our ability to reduce our debt and maintain our current credit ratings; and

•Possible recovery of pending or contemplated insurance claims, change orders and claims asserted against customers or third parties.

These forward-looking statements are not guarantees of future performance, involve or rely on a number of risks, uncertainties, and assumptions that are difficult to predict or are beyond our control, and reflect management’s beliefs and assumptions based on information available at the time the statements are made. We caution you that actual outcomes and results may differ materially from what is expressed, implied or forecasted by our forward-looking statements and that any or all of our forward-looking statements may turn out to be inaccurate or incorrect. These statements can be affected by inaccurate assumptions and by known or unknown risks and uncertainties, including the following:

•Market, industry, economic, financial or political conditions that are outside of our control, including economic, energy, infrastructure and environmental policies and plans that are adopted or proposed by the U.S. federal and state governments or other governments in territories or countries in which we operate, weakness in the capital markets and the ongoing and potential impact on financial markets and worldwide economic activity of the COVID-19 pandemic and governmental responses thereto;

1

•Quarterly variations in our operating and financial results, liquidity, financial condition, cash flows, capital requirements, and reinvestment opportunities, including the ongoing and potential impact to our business, operations, workforce and supply chains resulting from the COVID-19 pandemic and governmental responses thereto (including, among other things, implementation of vaccination and testing requirements);

•The severity, magnitude and duration of the COVID-19 pandemic, including impacts of the pandemic and of business and governmental responses thereto on our operations, personnel and supply chains, and on commercial activity and demand across our business and our customers’ businesses, as well as our inability to predict the extent to which the COVID-19 pandemic will adversely impact our business, financial performance, results of operations, financial position, liquidity, cash flows, the price of our securities and the achievement of our strategic objectives;

•Trends and growth opportunities in relevant markets, including our ability to obtain future project awards;

•The time and costs required to exit and resolve outstanding matters related to our Latin American operations, as well as the business and political climate in Latin America;

•Delays, deferrals, reductions in scope or cancellations of anticipated, pending or existing projects as a result of, among other things, the COVID-19 pandemic, supply chain disruptions, weather, regulatory or permitting issues, environmental processes, project performance issues, claimed force majeure events, protests or other political activity, legal challenges, reductions or eliminations in governmental funding or customer capital constraints;

•The effect of commodity prices and commodity production volumes on our operations and growth opportunities and on our customers’ capital programs and demand for our services;

•The successful negotiation, execution, performance and completion of anticipated, pending and existing contracts;

•Risks associated with operational hazards that arise due to the nature of the services we provide and the conditions in which we operate, including, among others, wildfires and explosions;

•Unexpected costs, liabilities, fines or penalties that may arise from legal proceedings, indemnity obligations, reimbursement obligations associated with letters of credit or bonds, multiemployer pension plans (e.g., underfunding of liabilities, termination or withdrawal liability) or other claims or actions asserted against us, including amounts that are not covered by, or are in excess of the coverage under, our third-party insurance;

•Potential unavailability or cancellation of third-party insurance coverage, as well as the exclusion of coverage for certain losses, potential increases in premiums for coverage deemed beneficial to us, or the unavailability of coverage deemed beneficial to us at reasonable and competitive rates (e.g., coverage for wildfire events);

•Damage to our brands or reputation arising as a result of cyber-security breaches, environmental and occupational health and safety matters, corporate scandal, failure to successfully perform a high-profile project, involvement in a catastrophic event (e.g., fire, explosion) or other negative incidents;

•Disruptions in, or failure to adequately protect, our information technology systems;

•Our dependence on suppliers, subcontractors, equipment manufacturers and other third parties and the impact of the COVID-19 pandemic on these service providers;

•Estimates and assumptions related to our financial results, remaining performance obligations and backlog;

•Our ability to attract, the potential shortage of, and increased costs with respect to skilled employees, as well as our ability to retain key personnel and qualified employees;

•Our dependence on fixed price contracts and the potential that we incur losses with respect to these contracts, including as a result of inaccurate estimates of project costs or inability to meet project schedule requirements or achieve guaranteed performance or quality standards for a project;

•Adverse weather conditions, natural disasters and other emergencies, including wildfires, pandemics (including the ongoing COVID-19 pandemic), hurricanes, tropical storms, floods, debris flows, earthquakes and other geological- and weather-related hazards;

•Our ability to generate internal growth;

•Competition in our business, including our ability to effectively compete for new projects and market share;

•The future development of natural resources;

•The failure of existing or potential legislative actions and initiatives to result in increased demand for our services;

2

•Fluctuations of prices of certain materials and equipment used in our and our customers’ businesses, including as a result of inflation, supply chain disruptions, governmental regulations on sourcing, the imposition of tariffs, and other changes in U.S. trade relationships with foreign countries;

•Cancellation provisions within our contracts and the risk that contracts expire and are not renewed or are replaced on less favorable terms;

•Loss of customers with whom we have long-standing or significant relationships;

•The potential that our participation in joint ventures or similar structures exposes us to liability or harm to our reputation as a result of acts or omissions by our partners;

•Our inability or failure to comply with the terms of our contracts, which may result in additional costs, unexcused delays, warranty claims, failure to meet performance guarantees, damages or contract terminations;

•The inability or refusal of our customers or third-party contractors to pay for services, which could be attributable to, among other things, the COVID-19 pandemic or challenged energy markets, and which could result in our inability to collect our outstanding receivables, failure to recover amounts billed to, or avoidance of certain payments received from, customers in bankruptcy or failure to recover on change orders or contract claims;

•Budgetary or other constraints that may reduce or eliminate tax incentives or government funding for projects, including renewable energy projects, which may result in project delays or cancellations;

•Our inability to successfully complete our remaining performance obligations or realize our backlog;

•Technological advancements and market developments that could reduce demand for our services;

•Risks associated with operating in international markets, including instability of foreign governments, currency exchange fluctuations, and compliance with unfamiliar foreign legal systems and cultural practices, the U.S. Foreign Corrupt Practices Act and other applicable anti-bribery and anti-corruption laws, and complex U.S. and foreign tax regulations and international treaties;

•Our inability to successfully identify, complete, integrate and realize synergies from acquisitions, including the inability to retain key personnel from acquired businesses;

•The potential adverse impact of acquisitions and investments, including the potential increase in risks already existing in our operations, poor performance or decline in value of acquired businesses or investments and unexpected costs or liabilities that may arise from acquisitions or investments;

•The adverse impact of impairments of goodwill, other intangible assets, receivables, long-lived assets or investments;

•Difficulties arising from our decentralized management structure;

•The impact of the unionized portion of our workforce on our operations, including labor stoppages or interruptions due to strikes or lockouts;

•An inability to access sufficient funding to finance desired growth and operations, including our ability to access capital markets on favorable terms, as well as fluctuations in the price and trading volume of our common stock, debt covenant compliance, interest rate fluctuations, a downgrade in our credit ratings and other factors affecting our financing and investing activities;

•Our ability to obtain bonds, letters of credit and other project security;

•Risks related to the implementation of new information technology systems;

•New or changed tax laws, treaties or regulations;

•Inability to realize deferred tax assets;

•Significant fluctuations in foreign currency exchange rates; and

•The other risks and uncertainties described elsewhere herein, including in Item 1A. Risk Factors of Part II of this Quarterly Report and in Item 1A. Risk Factors of Part I of our Annual Report on Form 10-K for the year ended December 31, 2020 (2020 Annual Report), and as may be detailed from time to time in our other public filings with the U.S. Securities and Exchange Commission (SEC).

3

All of our forward-looking statements, whether written or oral, are expressly qualified by these cautionary statements and any other cautionary statements that may accompany such forward-looking statements or that are otherwise included in this report. Although forward-looking statements reflect our good faith beliefs at the time they are made, reliance should not be placed on forward-looking statements because they involve known and unknown risks, uncertainties and other factors, which may cause our actual results, performance or achievements to differ materially from anticipated future results, performance or achievements expressed or implied by such forward-looking statements. In addition, we do not undertake and expressly disclaim any obligation to update or revise any forward-looking statements to reflect events or circumstances after the date of this report or otherwise.

4

PART I - FINANCIAL INFORMATION

Item 1. Financial Statements.

QUANTA SERVICES, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands, except share information)

(Unaudited)

	September 30, 2021		December 31, 2020
ASSETS
Current Assets:
Cash and cash equivalents	$	1,696,210	$	184,620
Accounts receivable, net of allowances of $39,709 and $16,546	3,002,172		2,716,083
Contract assets	760,279		453,832
Inventories	61,959		50,472
Prepaid expenses and other current assets	183,514		183,382
Total current assets	5,704,134		3,588,389
Property and equipment, net of accumulated depreciation of $1,481,416 and $1,372,132	1,601,500		1,560,656
Operating lease right-of-use assets	232,282		256,845
Other assets, net	602,838		435,713
Other intangible assets, net of accumulated amortization of $582,126 and $517,574	388,999		435,655
Goodwill	2,145,963		2,121,014
Total assets	$	10,675,716	$	8,398,272
LIABILITIES AND EQUITY
Current Liabilities:
Current maturities of long-term debt and short-term debt	$	23,748	$	14,764
Current portion of operating lease liabilities	78,869		85,134
Accounts payable and accrued expenses	1,760,789		1,509,794
Contract liabilities	501,142		528,864
Total current liabilities	2,364,548		2,138,556
Long-term debt, net of current maturities	2,930,905		1,174,294
Operating lease liabilities, net of current portion	161,320		178,822
Deferred income taxes	184,827		166,407
Insurance and other non-current liabilities	400,284		391,221
Total liabilities	6,041,884		4,049,300
Commitments and Contingencies
Equity:
Common stock, $0.00001 par value, 600,000,000 shares authorized, 165,007,258 and 162,710,792 shares issued, and 139,111,888 and 138,300,191 shares outstanding	2		2
Additional paid-in capital	2,232,319		2,170,026
Retained earnings	3,620,409		3,264,967
Accumulated other comprehensive loss	(242,986)		(232,997)
Treasury stock, 25,895,370 and 24,410,601 common shares	(979,034)		(857,817)
Total stockholders’ equity	4,630,710		4,344,181
Non-controlling interests	3,122		4,791
Total equity	4,633,832		4,348,972
Total liabilities and equity	$	10,675,716	$	8,398,272

The accompanying notes are an integral part of these condensed consolidated financial statements.

5

QUANTA SERVICES, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share information)

(Unaudited)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Revenues	$	3,353,278	$	3,020,161	$	9,056,675	$	8,290,487
Cost of services (including depreciation)	2,818,602		2,512,647		7,701,398		7,095,513
Gross profit	534,676		507,514		1,355,277		1,194,974
Equity in earnings of integral unconsolidated affiliates	10,232		5,120		22,865		6,165
Selling, general and administrative expenses	(274,846)		(250,654)		(788,308)		(709,299)
Amortization of intangible assets	(22,772)		(19,687)		(65,418)		(55,374)
Asset impairment charges	—		—		(2,319)		—
Change in fair value of contingent consideration liabilities	787		(78)		1,360		(598)
Operating income	248,077		242,215		523,457		435,868
Interest expense	(17,259)		(11,049)		(42,843)		(33,709)
Interest income	72		80		3,098		1,114
Other income (expense), net	6,089		2,931		18,232		(3,649)
Income before income taxes	236,979		234,177		501,944		399,624
Provision for income taxes	61,581		70,477		116,256		119,626
Net income	175,398		163,700		385,688		279,998
Less: Net income attributable to non-controlling interests	1,033		787		4,529		4,453
Net income attributable to common stock	$	174,365	$	162,913	$	381,159	$	275,545
Earnings per share attributable to common stock:
Basic	$	1.25	$	1.16	$	2.72	$	1.95
Diluted	$	1.21	$	1.13	$	2.64	$	1.90
Shares used in computing earnings per share:
Weighted average basic shares outstanding	140,008		140,542		140,134		141,610
Weighted average diluted shares outstanding	144,304		144,363		144,448		144,985

The accompanying notes are an integral part of these condensed consolidated financial statements.

6

QUANTA SERVICES, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(In thousands)

(Unaudited)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Net income	$	175,398	$	163,700	$	385,688	$	279,998
Other comprehensive income (loss), net of tax provision:
Foreign currency translation adjustment, net of tax of $0, $0, $0 and $0	(26,429)		15,707		(10,009)		(32,524)
Other, net of tax of $1, $0, $4 and $0	6		—		20		—
Other comprehensive income (loss)	(26,423)		15,707		(9,989)		(32,524)
Comprehensive income	148,975		179,407		375,699		247,474
Less: Comprehensive income attributable to non-controlling interests	1,033		787		4,529		4,453
Total comprehensive income attributable to common stock	$	147,942	$	178,620	$	371,170	$	243,021

The accompanying notes are an integral part of these condensed consolidated financial statements.

7

QUANTA SERVICES, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(Unaudited)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Cash Flows from Operating Activities:
Net income	$	175,398	$	163,700	$	385,688	$	279,998
Adjustments to reconcile net income to net cash provided by operating activities—
Depreciation	61,616		56,244		186,480		165,180
Amortization of intangible assets	22,772		19,687		65,418		55,374
Asset impairment charges	—		—		2,319		—
Impairment of cost method investment	—		—		—		9,311
Change in fair value of contingent consideration liabilities	(787)		78		(1,360)		598
Equity in (earnings) losses of unconsolidated affiliates	(10,758)		(5,260)		(24,734)		2,207
Amortization of deferred financing costs	3,919		3,070		5,609		4,247
Gain on sale of property and equipment	(1,077)		(2,246)		(10,931)		(4,218)
Provision for credit losses	249		1,566		24,169		2,910
Deferred income tax provision (benefit)	(2,502)		(17,443)		14,245		(19,226)
Non-cash stock-based compensation	21,642		21,431		64,252		58,323
Foreign currency gain	(4,901)		(1,505)		(6,531)		(4,942)
Payments for contingent consideration liabilities	—		—		—		(590)
Changes in operating assets and liabilities, net of non-cash transactions	(247,695)		(124,463)		(372,187)		290,715
Net cash provided by operating activities	17,876		114,859		332,437		839,887
Cash Flows from Investing Activities:
Capital expenditures	(74,612)		(50,780)		(232,996)		(167,037)
Proceeds from sale of property and equipment	16,431		5,844		35,101		18,460
Proceeds from insurance settlements related to property and equipment	255		73		535		271
Cash paid for acquisitions, net of cash, cash equivalents and restricted cash acquired	(33,261)		(187,655)		(101,373)		(212,092)
Proceeds from disposition of businesses	—		203		—		11,064
Investments in unconsolidated affiliates and other	(5,154)		(778)		(119,478)		(9,538)
Cash received from investments in unconsolidated affiliates and other entities	5		2,538		3,022		2,570
Cash paid for intangible assets	(200)		—		(524)		—
Net cash used in investing activities	(96,536)		(230,555)		(415,713)		(356,302)
Cash Flows from Financing Activities:
Borrowings under credit facility	1,240,766		478,762		3,124,845		2,453,941
Payments under credit facility	(1,142,350)		(1,648,614)		(2,857,190)		(3,602,660)
Proceeds from notes offering	1,487,450		990,130		1,487,450		990,130
Payments of other long-term debt	(916)		(652)		(2,530)		(1,635)
Net repayments of short-term debt, net of borrowings	13,619		(1,761)		9,372		(6,180)
Deferred financing costs	(5,056)		(7,794)		(5,056)		(7,794)
Payments for contingent consideration liabilities	—		—		(263)		(10,399)
Distributions to non-controlling interests	(1,107)		(744)		(6,357)		(4,669)
Payments related to tax withholding for stock-based compensation	(2,638)		(830)		(63,131)		(24,403)
Payment of dividends	(8,414)		(7,001)		(25,627)		(21,545)
Repurchase of common stock	(17,764)		—		(66,687)		(200,000)
Net cash provided by (used in) financing activities	1,563,590		(198,504)		1,594,826		(435,214)
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	(549)		449		738		986
Net increase in cash, cash equivalents and restricted cash	1,484,381		(313,751)		1,512,288		49,357
Cash, cash equivalents and restricted cash, beginning of period	214,715		532,853		186,808		169,745
Cash, cash equivalents and restricted cash, end of period	$	1,699,096	$	219,102	$	1,699,096	$	219,102

The accompanying notes are an integral part of these condensed consolidated financial statements.

8

QUANTA SERVICES, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY

(In thousands, except share data)

(Unaudited)

								Accumulated
				Additional				Other				Total		Non-
	Common Stock			Paid-In		Retained		Comprehensive		Treasury		Stockholders’		Controlling		Total
	Shares	Amount		Capital		Earnings		Income (Loss)		Stock		Equity		Interests		Equity
Balance, December 31, 2020	138,300,191	$	2	$	2,170,026	$	3,264,967	$	(232,997)	$	(857,817)	$	4,344,181	$	4,791	$	4,348,972
Other comprehensive income	—	—		—		—		8,539		—		8,539		—		8,539
Stock-based compensation activity	1,368,739	—		13,702		—		—		(55,101)		(41,399)		—		(41,399)
Common stock repurchases	(222,081)	—		—		—		—		(17,710)		(17,710)		—		(17,710)
Dividends declared ($0.06 per share)	—	—		—		(8,429)		—		—		(8,429)		—		(8,429)
Distributions to non-controlling interests	—	—		—		—		—		—		—		(1,129)		(1,129)
Net income	—	—		—		89,761		—		—		89,761		1,558		91,319
Balance, March 31, 2021	139,446,849	2		2,183,728		3,346,299		(224,458)		(930,628)		4,374,943		5,220		4,380,163
Other comprehensive income	—	—		—		—		7,895		—		7,895		—		7,895
Stock-based compensation activity	64,600	—		25,177		—		—		(216)		24,961		—		24,961
Common stock repurchases	(313,725)	—		—		—		—		(29,450)		(29,450)		—		(29,450)
Dividends declared ($0.06 per share)	—	—		—		(8,650)		—		—		(8,650)		—		(8,650)
Distributions to non-controlling interests	—	—		—		—		—		—		—		(4,121)		(4,121)
Other	—	—		—		—		—		—		—		25		25
Net income	—	—		—		117,033		—		—		117,033		1,938		118,971
Balance, June 30, 2021	139,197,724	2		2,208,905		3,454,682		(216,563)		(960,294)		4,486,732		3,062		4,489,794
Other comprehensive loss	—	—		—		—		(26,423)		—		(26,423)		—		(26,423)
Acquisitions	32,822	—		2,479		—		—		—		2,479		—		2,479
Stock-based compensation activity	66,100	—		20,935		—		—		(1,912)		19,023		—		19,023
Common stock repurchases	(184,758)	—		—		—		—		(16,828)		(16,828)		—		(16,828)
Dividends declared ($0.06 per share)	—	—		—		(8,638)		—		—		(8,638)		—		(8,638)
Distributions to non-controlling interests	—	—		—		—		—		—		—		(1,107)		(1,107)
Other	—	—		—		—		—		—		—		134		134
Net income	—	—		—		174,365		—		—		174,365		1,033		175,398
Balance, September 30, 2021	139,111,888	$	2	$	2,232,319	$	3,620,409	$	(242,986)	$	(979,034)	$	4,630,710	$	3,122	$	4,633,832

The accompanying notes are an integral part of these condensed consolidated financial statements.

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QUANTA SERVICES, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY

(In thousands, except share data)

(Unaudited)

											Accumulated
				Exchangeable			Additional				Other				Total		Non-
	Common Stock			Shares			Paid-In		Retained		Comprehensive		Treasury		Stockholders’		Controlling		Total
	Shares	Amount		Shares	Amount		Capital		Earnings		Income (Loss)		Stock		Equity		Interests		Equity
Balance, December 31, 2019	142,324,318	$	2	36,183	$	—	$	2,024,610	$	2,854,271	$	(241,818)	$	(586,773)	$	4,050,292	$	3,539	$	4,053,831
Credit loss cumulative effect adjustment	—	—		—	—		—		(3,841)		—		—		(3,841)				(3,841)
Other comprehensive loss	—	—		—	—		—		—		(82,968)		—		(82,968)		—		(82,968)
Acquisitions	121,089	—		—	—		4,329		—		—		—		4,329				4,329
Stock-based compensation activity	1,124,530	—		—	—		11,444		—		—		(19,750)		(8,306)		—		(8,306)
Exchange of exchangeable shares	36,183	—		(36,183)	—		—		—		—		—		—		—		—
Common stock repurchases	(5,960,134)	—		—	—		—		—				(200,000)		(200,000)		—		(200,000)
Dividends declared ($0.05 per share)	—	—		—	—		—		(7,184)		—		—		(7,184)		—		(7,184)
Distributions to non-controlling interests	—	—		—	—		—		—		—		—		—		(1,963)		(1,963)
Other	—	—		—	—		—		(516)		—		—		(516)		293		(223)
Net income	—	—		—	—		—		38,686		—		—		38,686		2,817		41,503
Balance, March 31, 2020	137,645,986	2		—	—		2,040,383		2,881,416		(324,786)		(806,523)		3,790,492		4,686		3,795,178
Other comprehensive income	—	—		—	—		—		—		34,737		—		34,737		—		34,737
Stock-based compensation activity	65,826	—		—	—		22,717		—		—		(281)		22,436		—		22,436
Dividends declared ($0.05 per share)	—	—		—	—		—		(7,182)		—		—		(7,182)		—		(7,182)
Distributions to non-controlling interests	—	—		—	—		—		—		—		—		—		(1,962)		(1,962)
Net income	—	—		—	—		—		73,946		—		—		73,946		849		74,795
Balance, June 30, 2020	137,711,812	$	2	—	$	—	$	2,063,100	$	2,948,180	$	(290,049)	$	(806,804)	$	3,914,429	$	3,573	$	3,918,002
Other comprehensive income	—	—		—	—		—		—		15,707		—		15,707		—		15,707
Acquisitions	1,087,774	—		—	—		45,532		—		—		—		45,532		—		45,532
Stock-based compensation activity	43,760	—		—	—		21,425		—		—		(812)		20,613		—		20,613
Dividends declared ($0.05 per share)	—	—		—	—		—		(7,244)		—		—		(7,244)		—		(7,244)
Distributions to non-controlling interests	—	—		—	—		—		—		—		—		—		(744)		(744)
Net income	—	—		—	—		—		162,913		—		—		162,913		787		163,700
Balance, September 30, 2020	138,843,346	$	2	—	$	—	$	2,130,057	$	3,103,849	$	(274,342)	$	(807,616)	$	4,151,950	$	3,616	$	4,155,566

The accompanying notes are an integral part of these condensed consolidated financial statements.

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. BUSINESS AND ORGANIZATION:

Quanta Services, Inc. (together with its subsidiaries, Quanta) is a leading provider of specialty contracting services, delivering comprehensive infrastructure solutions for the electric and gas utility, communications, pipeline and energy industries in the United States, Canada, Australia and select other international markets. Quanta reports its results under two reportable segments: (1) Electric Power Infrastructure Solutions and (2) Underground Utility and Infrastructure Solutions.

On October 13, 2021, Quanta completed the acquisition of Blattner Holding Company and its operating subsidiaries (collectively, Blattner). Blattner is a large utility-scale renewable energy infrastructure solutions provider that is located and primarily operates in North America. For additional information regarding this acquisition, see Note 4. Blattner provides comprehensive solutions to customers in the renewable energy industry, which generally include front-end engineering, procurement, project management and construction services for wind, solar and energy storage projects. Blattner’s results will be included in Quanta’s consolidated financial statements beginning on the acquisition date.

Electric Power Infrastructure Solutions Segment

The Electric Power Infrastructure Solutions segment provides comprehensive network solutions to customers in the electric power and other industries. Services performed by the Electric Power Infrastructure Solutions segment generally include the design, new construction, upgrade and repair and maintenance of electric power transmission and distribution infrastructure and substation facilities, along with other engineering and technical services. This includes solutions that support the implementation of upgrades by utilities to modernize and harden the electric power grid in order to ensure its safety and enhance reliability. In addition, this segment provides engineering and construction services for switchyards and transmission infrastructure needed to interconnect renewable energy generation, including solar, wind, hydro power and backup natural gas generation facilities. This segment also provides emergency restoration services, including the repair of infrastructure damaged by fire and inclement weather; the energized installation, maintenance and upgrade of electric power infrastructure utilizing unique bare hand and hot stick methods and Quanta’s proprietary robotic arm techniques; and the installation of “smart grid” technologies on electric power networks. Engineering and construction services related to, among other things, electric vehicle charging infrastructure, micro-grids and battery storage are also performed in this segment. This segment also provides comprehensive design and construction solutions to wireline and wireless communications companies, cable multi-system operators and other customers within the communications industry, including services in connection with 5G wireless deployment; and the design, installation, maintenance and repair of commercial and industrial wiring. This segment also provides aviation services in support of the services described above and includes the majority of the financial results of Quanta’s postsecondary educational institution, which specializes in pre-apprenticeship training, apprenticeship training and specialized utility task training for electric workers, as well as training for the gas distribution and communications industries.

Underground Utility and Infrastructure Solutions Segment

The Underground Utility and Infrastructure Solutions segment provides comprehensive infrastructure solutions, including design, engineering, new construction, upgrade and repair and maintenance services, to customers involved in the transportation, distribution, storage and processing of natural gas, oil and other products. Services include the upgrade, new construction and repair and maintenance of natural gas systems for gas utility customers, as well as pipeline protection, integrity testing, rehabilitation and replacement. Quanta also provides catalyst replacement services, high-pressure and critical-path turnaround services, instrumentation and electrical services, piping, fabrication and storage tank services to the midstream and downstream industrial energy markets. This segment also provides engineering and construction services for pipeline systems, storage systems and compressor and pump stations and the fabrication of pipeline support systems and related structures and facilities, as well as trenching, directional boring and mechanized welding services related to the services described above and in connection with our electric power infrastructure services. To a lesser extent, this segment includes construction services for the offshore energy market and services in connection with the design, installation and maintenance of fueling systems and water and sewer infrastructure.

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

(Unaudited)

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

Principles of Consolidation

The condensed consolidated financial statements of Quanta include the accounts of Quanta Services, Inc. and its wholly-owned subsidiaries, which are also referred to as its operating units. The condensed consolidated financial statements also include the accounts of certain of Quanta’s investments in joint ventures, which are either consolidated or proportionately consolidated. Investments in affiliated entities in which Quanta does not have a controlling financial interest, but over which Quanta has significant influence, usually because Quanta holds a voting interest of between 20% and 50% in the affiliated entity, are accounted for using the equity method. Unless the context requires otherwise, references to Quanta include Quanta Services, Inc. and its consolidated subsidiaries.

Interim Condensed Consolidated Financial Information

These unaudited condensed consolidated financial statements have been prepared pursuant to the rules of the U.S. Securities and Exchange Commission (SEC). Certain information and footnote disclosures, normally included in annual financial statements prepared in accordance with generally accepted accounting principles in the United States (GAAP), have been condensed or omitted pursuant to those rules and regulations. Quanta believes that the disclosures made are adequate to make the information presented not misleading. In the opinion of management, all adjustments, consisting only of normal recurring adjustments, necessary to fairly state the financial position, results of operations, comprehensive income and cash flows with respect to the interim condensed consolidated financial statements have been included. The results of operations and comprehensive income for the interim periods are not necessarily indicative of the results for the entire fiscal year. The results of Quanta have historically been subject to significant seasonal fluctuations.

Quanta recommends that these unaudited condensed consolidated financial statements be read in conjunction with the audited consolidated financial statements and notes thereto of Quanta and its consolidated subsidiaries, which contain additional information about Quanta’s policies and are included in Quanta’s 2020 Annual Report.

Use of Estimates and Assumptions

The preparation of financial statements in conformity with GAAP requires the use of estimates and assumptions by management in determining the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities known to exist as of the date the financial statements are published, and the reported amounts of revenues and expenses recognized during the periods presented. Quanta reviews all significant estimates affecting its consolidated financial statements on a recurring basis and records the effect of any necessary adjustments prior to their publication. Judgments and estimates are based on Quanta’s beliefs and assumptions derived from information available at the time such judgments and estimates are made. Uncertainties with respect to such estimates and assumptions are inherent in the preparation of financial statements. Estimates are primarily used in Quanta’s assessment of revenue recognition for construction contracts, including contractual change orders and claims; allowance for credit losses; valuation of inventory; useful lives of assets; fair value assumptions in analyzing goodwill, other intangibles and long-lived asset impairments; equity and other investments; purchase price allocations; acquisition-related contingent consideration liabilities; multiemployer pension plan withdrawal liabilities; contingent liabilities associated with, among other things, legal proceedings and claims, parent guarantees and indemnity obligations; estimated insurance claim recoveries; stock-based compensation; operating results of reportable segments; provision for income taxes; and uncertain tax positions.

Revenue Recognition

Quanta’s services may be provided pursuant to master service agreements (MSAs), repair and maintenance contracts and fixed price and non-fixed price construction contracts. These contracts are classified into three categories based on the methods by which transaction prices are determined and revenue is recognized: unit-price contracts, cost-plus contracts and fixed price contracts. Transaction prices for unit-price contracts are determined on a per unit basis, transaction prices for cost-plus contracts are determined by applying a profit margin to costs incurred on the contracts and transaction prices for fixed price contracts are determined on a lump-sum basis.

Performance Obligations

At September 30, 2021 and December 31, 2020, the aggregate transaction price allocated to unsatisfied or partially satisfied performance obligations was approximately $4.37 billion and $3.99 billion, of which 78.7% and 71.2% were expected to be recognized in the subsequent twelve months. These amounts represent management’s estimates of the consolidated revenues that are expected to be realized from the remaining portion of firm orders under fixed price contracts not yet completed or for which work had not yet begun as of such dates. For purposes of calculating remaining performance

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

(Unaudited)

obligations, Quanta includes all estimated revenues attributable to consolidated joint ventures and variable interest entities, revenues from funded and unfunded portions of government contracts to the extent they are reasonably expected to be realized and revenues from change orders and claims to the extent management believes additional contract revenues will be earned and are deemed probable of collection. Excluded from remaining performance obligations are potential orders under MSAs and non-fixed price contracts expected to be completed within one year.

Contract Estimates

Actual revenues and project costs can vary, sometimes substantially, from previous estimates due to changes in a variety of factors, including unforeseen or changed circumstances not included in Quanta’s cost estimates or covered by its contracts. Some of the factors that can result in positive changes in estimates on projects include successful execution through project risks, reduction of estimated project costs or increases of estimated revenues. Some of the factors that can result in negative changes in estimates include concealed or unknown site conditions; changes to or disputes with customers regarding the scope of services; changes in estimates related to the length of time to complete a performance obligation; changes or delays with respect to permitting and regulatory requirements; changes in the cost or availability of equipment, commodities, materials or skilled labor; unanticipated costs or claims due to delays or failure to perform by customers or third parties; customer failure to provide required materials or equipment; errors in engineering, specifications or designs; project modifications; adverse weather conditions, natural disasters, and other emergencies (including the ongoing COVID-19 pandemic); and performance and quality issues causing delay (including payment of liquidated damages) or requiring rework or replacement. Any changes in estimates may result in changes to profitability or losses associated with the related performance obligations.

Changes in estimated revenues, costs and profit are recognized on a cumulative catch-up basis and recorded in the period they are determined to be probable and can be reasonably estimated. Such changes in estimates can result in the recognition of revenue in a current period for performance obligations that were satisfied or partially satisfied in prior periods or the reversal of previously recognized revenue if the currently estimated revenue is less than the previous estimate. The impact of a change in contract estimate is measured as the difference between the revenue or gross profit recognized in the prior period as compared to the revenue or gross profit which would have been recognized had the revised estimate been used as the basis of recognition in the prior period. Changes in estimates can also result in contract losses, which are recognized in full when they are determined to be probable and can be reasonably estimated.

Operating results for the three months ended September 30, 2021 were favorably impacted by $41.9 million, or 7.8%, of gross profit as a result of aggregate changes in contract estimates related to projects that were in progress at June 30, 2021. Operating results for the nine months ended September 30, 2021 were favorably impacted by $127.4 million, or 9.4%, of gross profit as a result of aggregate changes in contract estimates related to projects that were in progress at December 31, 2020. The overall favorable impact resulted from net positive changes in estimates across a large number of projects, primarily as a result of favorable performance and successful mitigation of risks and contingencies as the projects progressed to completion.

Operating results for the three months ended September 30, 2020 were favorably impacted by $48.7 million, or 9.6%, of gross profit as a result of aggregate changes in contract estimates related to projects that were in progress at June 30, 2020. Operating results for the nine months ended September 30, 2020 were impacted by less than 5% of gross profit as a result of aggregate changes in contract estimates related to projects that were in progress at December 31, 2019.

Certain projects were materially impacted by changes to estimated contract revenues and/or project costs during the three and nine months ended September 30, 2020. Revenues and gross profit were favorably impacted as a result of successful execution through project risks and close-out activities on certain large pipeline projects in the United States, as well as a project scope reduction on a large pipeline project in the United States that allowed Quanta to recognize a portion of previously deferred milestone payments and reduce certain contingencies on the project. The favorable impact related to these projects was partially offset by increased costs on two large pipeline projects in Canada that experienced severe weather conditions during the three and nine months ended September 30, 2020, both of which were complete as of September 30, 2021. With respect to all of these large pipeline projects, the aggregate net favorable impact on gross profit related to work performed in prior periods was $32.9 million and $15.1 million during the three and nine months ended September 30, 2020.

Additionally, during the three and nine months ended September 30, 2020, Quanta was pursuing the orderly exit of its Latin American operations, which was substantially complete as of December 31, 2020. These operations were adversely impacted by the COVID-19 pandemic due to shelter-in-place restrictions and other work disruptions, and as a result Quanta accelerated various contract terminations and other activities in order to expedite cessation of operations in the region. These factors resulted in changes in estimates on several projects and negatively impacted gross profit related to work performed in prior periods by $12.1 million and $28.6 million in the aggregate during the three and nine months ended September 30, 2020.

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

(Unaudited)

Changes in cost estimates on certain contracts may also result in the issuance of change orders, which can be approved or unapproved by the customer, or the assertion of contract claims. As of September 30, 2021 and December 31, 2020, Quanta had recognized revenues of $254.1 million and $141.2 million related to change orders and claims included as contract price adjustments that were in the process of being negotiated in the normal course of business. The largest component of the revenues recognized is associated with change orders and claims arising from delays on two electric transmission projects in Canada. The most significant delays on these projects occurred in the first and third quarters of 2021 and were related to the COVID-19 pandemic that negatively impacted productivity. Additionally, during the third quarter of 2021, both of the projects were negatively impacted by unrelated wildfires, and one was also impacted by acceleration of the project timeline, all of which resulted in change orders. Quanta believes that the contracts for these projects entitle it to recover certain amounts associated with these delays. The aggregate amounts related to change orders and claims, which are included in “Contract assets” in the accompanying condensed consolidated balance sheets, represent management’s estimates of additional contract revenues that have been earned and are probable of collection. However, Quanta’s estimates could change, and the amount ultimately realized could be significantly higher or lower than the estimated amount.

Revenues by Category

The following tables present Quanta’s revenue disaggregated by geographic location, as determined by the job location, and contract type (in thousands):

	Three Months Ended September 30,								Nine Months Ended September 30,
	2021				2020				2021				2020
By primary geographic location:
United States	$	2,892,446	86.2	%	$	2,629,606	87.1	%	$	7,669,360	84.7	%	$	7,105,568	85.7	%
Canada	382,072		11.4	%	320,576		10.6	%	1,123,077		12.4	%	917,621		11.1	%
Australia	52,804		1.6	%	49,537		1.6	%	170,719		1.9	%	156,664		1.9	%
Others	25,956		0.8	%	20,442		0.7	%	93,519		1.0	%	110,634		1.3	%
Total revenues	$	3,353,278	100.0	%	$	3,020,161	100.0	%	$	9,056,675	100.0	%	$	8,290,487	100.0	%

	Three Months Ended September 30,								Nine Months Ended September 30,
	2021				2020				2021				2020
By contract type:
Unit-price contracts	$	1,399,358	41.8	%	$	1,141,102	37.7	%	$	3,593,644	39.7	%	$	3,034,169	36.6	%
Cost-plus contracts	825,622		24.6	%	702,392		23.3	%	2,247,879		24.8	%	1,958,404		23.6	%
Fixed price contracts	1,128,298		33.6	%	1,176,667		39.0	%	3,215,152		35.5	%	3,297,914		39.8	%
Total revenues	$	3,353,278	100.0	%	$	3,020,161	100.0	%	$	9,056,675	100.0	%	$	8,290,487	100.0	%

Under fixed price contracts, as well as unit-price contracts with more than an insignificant amount of partially completed units, revenue is recognized as performance obligations are satisfied over time, with the percentage completion generally measured as the percentage of costs incurred to total estimated costs for such performance obligation. Approximately 42.5% and 47.9% of Quanta’s revenues recognized during the three months ended September 30, 2021 and 2020 were associated with this revenue recognition method, and 43.4% and 48.4% of Quanta’s revenues recognized during the nine months ended September 30, 2021 and 2020 were associated with this revenue recognition method.

Contract Assets and Liabilities

Contract assets and liabilities, recorded as current assets and liabilities, respectively, consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Contract assets	$	760,279	$	453,832
Contract liabilities	$	501,142	$	528,864

Contract assets and liabilities fluctuate period to period based on various factors, including, among others, changes in the number and size of projects in progress at period end and variability in billing and payment terms, such as up-front or advance billings, interim or milestone billings, deferred billings and unapproved change orders and contract claims recognized in

14

QUANTA SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

(Unaudited)

revenues. The increase in contract assets from December 31, 2020 to September 30, 2021 was primarily due to increased working capital requirements related to progress on two large electric transmission projects in Canada and the timing of billings for such projects. Both of the projects were negatively impacted by delays related to the COVID-19 pandemic and unrelated wildfires, and one project was also impacted by acceleration of the project timeline, all of which resulted in change orders and an increase in contract assets.

Revenues were positively impacted by $151.7 million during the nine months ended September 30, 2021 as a result of changes in estimates associated with performance obligations on fixed price contracts partially satisfied prior to December 31, 2020. During the nine months ended September 30, 2021, Quanta recognized revenue of approximately $381.9 million related to contract liabilities outstanding at December 31, 2020.

Current and Long-Term Accounts Receivable and Allowance for Credit Losses

Quanta’s historical loss ratio and its determination of risk pools, which are used to calculate expected credit losses, may be adjusted for changes in customer credit concentrations within its portfolio of financial assets, customers’ ability to pay, and other considerations, such as economic and market changes, changes to the regulatory or technological environments affecting customers and the consistency between current and forecasted economic conditions and historical economic conditions used to derive historical loss ratios. At the end of each quarter, management reassesses these and other relevant factors, including any potential effects from the currently challenged energy market and the ongoing COVID-19 pandemic.

Quanta considers accounts receivable delinquent after 30 days but does not generally consider such amounts delinquent in its credit loss analysis unless the accounts receivable are at least 90 days past due. In addition to monitoring delinquent accounts, management monitors the credit quality of its receivables by, among other things, obtaining credit ratings of significant customers, assessing economic and market conditions and evaluating material changes to a customer’s business, cash flows and financial condition. Should anticipated recoveries relating to receivables fail to materialize, including anticipated recoveries relating to bankruptcies or other workout situations, Quanta could experience reduced cash flows and losses in excess of current allowances provided.

For example, in July 2021 Limetree Bay Refining, LLC (Limetree Refining), a customer within Quanta’s Underground Utility and Infrastructure Solutions segment, filed for bankruptcy protection under Chapter 11 of the U.S. Bankruptcy Code, as amended, after experiencing operational and financial difficulties and shutting down operations at its refinery. As of September 30, 2021, Quanta had $31.3 million of billed and unbilled receivables for services performed and other costs. Quanta also had $0.7 million of billed and unbilled receivables outstanding from Limetree Bay Terminals, LLC (Limetree Terminals), an affiliate of Limetree Refining that has not filed for bankruptcy. During the three months ended June 30, 2021, Quanta recorded a provision for credit loss of $23.6 million with respect to these receivables based on the current estimated amount of expected loss. However, given the uncertainties associated with the bankruptcy proceeding and the financial condition of the customers, the amount of receivables ultimately collected and the ultimate amount of credit loss recognized depends on a number of factors that are subject to change, including, among other things, the potential sale of the refinery assets by Limetree Refining, negotiations with respect to payment of the amounts owed by Limetree Terminals and the result of any preferential payment actions brought in the bankruptcy proceeding. As such, an additional allowance for credit loss may be recorded in the future, including with respect to the remaining $8.4 million of receivables owed by the customers. See Concentrations of Credit Risk in Note 10 for further discussion of the credit quality of certain other outstanding receivables due from customers that have experienced financial difficulties.

Activity in Quanta’s allowance for credit losses consisted of the following (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Balance at beginning of period	$	39,713	$	14,948	$	16,546	$	9,398
Cumulative effect of adoption of new credit loss standard	—		—		—		5,067
Provision for credit losses	249		1,566		24,169		2,910
Direct write-offs charged against the allowance	(253)		(110)		(1,006)		(971)
Balance at end of period	$	39,709	$	16,404	$	39,709	$	16,404

Certain contracts allow customers to withhold a small percentage of billings pursuant to retainage provisions, and such amounts are generally due upon completion of the contract and acceptance of the project by the customer. Based on Quanta’s

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QUANTA SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

(Unaudited)

experience in recent years, the majority of these retainage balances are expected to be collected within approximately twelve months of September 30, 2021. Retainage balances with expected settlement dates within twelve months of September 30, 2021 and December 31, 2020 were $295.9 million and $306.3 million, which are included in “Accounts receivable.” Retainage balances with expected settlement dates beyond twelve months of September 30, 2021 and December 31, 2020 were each $88.2 million and are included in “Other assets, net.”

Quanta recognizes unbilled receivables for non-fixed price contracts within “Accounts receivable” in certain circumstances, such as when revenues have been earned and recorded but the amount cannot be billed under the terms of the contract until a later date or when amounts arise from routine lags in billing (for example, work completed during one month but not billed until the next month). These balances do not include revenues recognized for work performed under fixed-price contracts, as these amounts are recorded as “Contract assets.” At September 30, 2021 and December 31, 2020, unbilled receivables included in “Accounts receivable” were $827.3 million and $472.3 million. The increase in unbilled receivables was primarily due to the ramp up of work, certain delays in billing related to a large customer and a significant amount of emergency restoration services revenues performed in the latter part of the third quarter that remained unbilled at the end of the quarter. Quanta also recognizes unearned revenues for non-fixed price contracts when cash is received prior to recognizing revenues for the related performance obligation. Unearned revenues, which are included in “Accounts payable and accrued expenses,” were $39.5 million and $53.6 million at September 30, 2021 and December 31, 2020.

Cash and Cash Equivalents

Amounts related to Quanta’s cash and cash equivalents based on geographic location of the bank accounts were as follows (in thousands):

	September 30, 2021		December 31, 2020
Cash and cash equivalents held in domestic bank accounts	$	1,664,990	$	156,122
Cash and cash equivalents held in foreign bank accounts	31,220		28,498
Total cash and cash equivalents	$	1,696,210	$	184,620

At September 30, 2021 and December 31, 2020, cash equivalents were $1.63 billion and $98.0 million and consisted primarily of money market investments and money market mutual funds and are discussed further in the Fair Value Measurements section within this Note 2. The proceeds received from Quanta’s issuance of senior notes on September 23, 2021 represented a significant portion of the cash and cash equivalents balance at September 30, 2021, and such proceeds were utilized to fund the acquisition of Blattner on October 13, 2021, as described further in Notes 4 and 6.

Cash and cash equivalents held by joint ventures, which are either consolidated or proportionately consolidated, are available to support joint venture operations, but Quanta cannot utilize those assets to support its other operations. Quanta generally has no right to cash and cash equivalents held by a joint venture other than participating in distributions, to the extent made, and in the event of dissolution. Cash and cash equivalents held by Quanta’s wholly-owned captive insurance company are generally not available for use in support of its other operations. Amounts related to cash and cash equivalents held by joint ventures and the captive insurance company, which are included in Quanta’s total cash and cash equivalents balances, were as follows (in thousands):

	September 30, 2021		December 31, 2020
Cash and cash equivalents held by domestic joint ventures	$	13,377	$	7,714
Cash and cash equivalents held by foreign joint ventures	4,568		3,973
Total cash and cash equivalents held by joint ventures	17,945		11,687
Cash and cash equivalents held by captive insurance company	132,916		85,014
Cash and cash equivalents not held by joint ventures or captive insurance company	1,545,349		87,919
Total cash and cash equivalents	$	1,696,210	$	184,620

Goodwill and Other Intangible Assets

Goodwill, net of accumulated impairment losses, represents the excess of cost over the fair market value of net tangible and identifiable intangible assets of acquired businesses and is stated at cost. Quanta has determined that its individual operating units represent its reporting units for the purpose of assessing goodwill impairment. Goodwill is not amortized but is tested for impairment annually in the fourth quarter of the fiscal year, or more frequently if events or circumstances arise which indicate

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that goodwill may be impaired. Qualitative indicators that may trigger the need for annual or interim quantitative impairment testing include, among other things, deterioration in macroeconomic conditions; declining financial performance; deterioration in the operational environment; an expectation of selling or disposing of a portion of a reporting unit; a significant change in market, management, business strategy or business climate; a loss of a significant customer; increased competition; a sustained decrease in share price; or a decrease in Quanta’s market capitalization below book value. Quanta did not identify any triggering events in the first three quarters of 2021 and did not recognize any goodwill impairments for the three and nine months ended September 30, 2021.

Quanta’s intangible assets include customer relationships; backlog; trade names; non-compete agreements; patented rights, developed technology, and process certifications; and curriculum, all of which are subject to amortization, as well as an engineering license, which is not subject to amortization. As a result of the broader challenges in the energy market, the effect of which continues to be exacerbated by the COVID-19 pandemic, Quanta assessed the expected negative impact related to its intangible assets, particularly intangible assets associated with reporting units within the Underground Utility and Infrastructure Solutions Division. Quanta concluded that such impact is not likely to result in intangible asset impairments, and therefore no intangible asset impairments were recognized during the three and nine months ended September 30, 2021.

In connection with its annual goodwill assessment in 2020, Quanta also considered the sensitivity of its fair value estimates to changes in certain valuation assumptions, including with respect to reporting units within Quanta’s Underground Utility and Infrastructure Solutions Division that have recently been negatively impacted by energy market challenges. The potential future impact of these challenges is uncertain and depends on numerous factors and could continue or increase in future periods. In particular, two Canadian pipeline-related businesses and a United States material handling services business were identified in the annual goodwill assessment to have an increased risk of goodwill impairment in the near and medium term due to the currently challenged energy market. After taking into account a 10% decrease in fair value, these reporting units would have had fair values below their carrying amounts as of December 31, 2020. The aggregate goodwill and intangible asset balances for these three businesses totaled $100.1 million and $16.0 million as of September 30, 2021. In addition, a specialized industrial services business located in the United States experienced lower demand for certain services during the year ended December 31, 2020, which has continued in 2021, as customers reduced and deferred regularly scheduled maintenance due to lack of demand for refined products, particularly certain transportation-related fuels, as a result of the COVID-19 pandemic. After taking into account a 10% decrease in fair value, the reporting unit would have had a fair value in excess of its carrying amount as of December 31, 2020; however, uncertainty as to the timing and extent of recovery of demand for refined products has increased the risk of goodwill impairment for this reporting unit. The goodwill and intangible asset balances for this reporting unit were $313.4 million and $51.9 million as of September 30, 2021. Quanta will continue to monitor the goodwill associated with these reporting units, and should they suffer additional declines in actual or forecasted financial results, the risk of goodwill impairment would increase.

Investments in Affiliates and Other Entities

Investments in entities of which Quanta is not the primary beneficiary, but over which Quanta has the ability to exercise significant influence, are accounted for using the equity method of accounting. Equity method investments are carried at original cost adjusted for Quanta’s proportionate share of the investees’ income, losses and distributions. The carrying values for Quanta’s unconsolidated equity method investments were $73.8 million and $44.9 million at September 30, 2021 and December 31, 2020 and are included in “Other assets, net” in the accompanying condensed consolidated balance sheets. Quanta’s share of net income or losses of these investments is included within operating income in the accompanying condensed consolidated statements of operations when the investee is operationally integral to the operations of Quanta and is reported as “Equity in earnings (losses) of integral unconsolidated affiliates.” Quanta’s share of net income or losses of unconsolidated equity method investments that are not operationally integral to the operations of Quanta are included in “Other income (expense), net” below operating income in the accompanying condensed consolidated statements of operations. As of September 30, 2021, Quanta had receivables of $13.3 million and payables of $3.2 million from its integral unconsolidated affiliates.

During the nine months ended September 30, 2020, Quanta recognized impairment losses of $8.7 million related to a non-integral equity method investment, which were primarily due to the decline in commodity prices and production volumes during 2020. These impairment losses are included in “Other income (expense), net” in the accompanying condensed consolidated statements of operations for the nine months ended September 30, 2020.

In October 2021, Quanta acquired a 44% interest in an entity that provides right-of-way solutions, including site preparation and clearing, materials delivery and installation and management of permitting requirements and traffic control for approximately $18 million, subject to certain adjustments. This investment will be accounted for as an integral affiliate using the equity method of accounting.

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Investments in entities of which Quanta is not the primary beneficiary, and over which Quanta does not have the ability to exercise significant influence are accounted for using the cost method of accounting. Additionally, certain investments provide for significant influence over the investee, but also include preferential liquidation rights, which precludes accounting for the investments under the equity method. These cost method investments are required to be measured at fair value, with changes in fair value recognized in net income unless the investments do not have readily determinable fair values, in which case the investments are measured at cost minus impairment (if any), plus or minus observable price changes in orderly transactions for an identical or similar investment in the same company. Earnings on investments accounted for using the cost method of accounting are recognized as dividends are declared. These earnings and any impairments of cost method investments are reported in “Other income (expense), net” in the accompanying condensed consolidated statements of operations.

The carrying values for investments accounted for using the cost method of accounting were $130.2 million and $39.5 million at September 30, 2021 and December 31, 2020, and these amounts are included in “Other assets, net” in the accompanying condensed consolidated balance sheets. During the three months ended March 31, 2021, Quanta acquired a minority interest in a broadband technology provider for $90.0 million. This investment includes preferential liquidation rights and is accounted for using the cost method of accounting. There have been no changes in the carrying value of the investment through September 30, 2021.

During the three months ended March 31, 2021, Quanta also purchased, through its wholly-owned captive insurance company, certain real property, including associated buildings and facilities, that is expected to be developed for its future corporate headquarters. A portion of this property is currently leased to third-party lessees and is expected to continue to be leased to third-party lessees in the future. As a result, an investment in real estate of $23.5 million was recognized at cost for the third-party leased portion of the property during the three months ended March 31, 2021, and the carrying amount of $23.4 million is included in “Other assets, net” in the accompanying condensed consolidated balance sheet at September 30, 2021.

During the three months ended June 30, 2020, Quanta recognized a $9.3 million impairment to an investment in a water and gas infrastructure contractor, which also represents the cumulative amount of impairment on investments accounted for using the cost method of accounting. Quanta did not exercise its option to acquire the remaining interest in this business at an agreed price based on a multiple of the company’s earnings during a designated performance period.

See Note 10 for additional information related to investments.

Puerto Rico Joint Venture

During the three months ended June 30, 2020, a joint venture in which Quanta owns a 50% interest, LUMA Energy, LLC (LUMA), was selected for a 15-year operation and maintenance agreement to operate, maintain and modernize the approximately 18,000-mile electric transmission and distribution system in Puerto Rico. In June 2021, LUMA completed the steps necessary to transition operation and maintenance of the system from the owner to LUMA and entered into an interim services agreement. Once the owner emerges from its Title III debt restructuring process, the 15-year operation and maintenance period is scheduled to begin. During the interim services period, LUMA receives a fixed annual management fee, payable in monthly installments, and is reimbursed for costs and expenses. During the 15-year operation and maintenance period, LUMA will continue to be reimbursed for costs and expenses and receive a fixed annual management fee, but will also have the opportunity to receive additional annual performance-based incentive fees. LUMA has not assumed and will not assume ownership of any electric transmission and distribution system assets or be responsible for operation of the power generation assets. Quanta’s ownership interest and participation in LUMA is accounted for as an equity method investment due to Quanta’s equal ownership and management of LUMA with its joint venture partner. LUMA is operationally integral to the operations of Quanta, and therefore Quanta’s share of LUMA’s net income or losses is reported within operating income in “Equity in earnings (losses) of integral unconsolidated affiliates.” Included within the equity method investments described above are Quanta’s equity interest in LUMA of $34.5 million and $10.9 million at September 30, 2021 and December 31, 2020.

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Accounts payable and accrued expenses

Accounts payable and accrued expenses consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Accounts payable, trade	$	956,873	$	798,023
Accrued compensation and related expenses	497,451		378,002
Other accrued expenses	306,465		333,769
Accounts payable and accrued expenses	$	1,760,789	$	1,509,794

Income Taxes

Quanta regularly evaluates valuation allowances established for deferred tax assets for which future realization is uncertain, including in connection with changes in tax laws. The estimation of required valuation allowances includes estimates of future taxable income. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Quanta considers projected future taxable income and tax planning strategies in making this assessment. If actual future taxable income differs from these estimates, Quanta may not realize deferred tax assets to the extent estimated.

As of September 30, 2021, the total amount of unrecognized tax benefits relating to uncertain tax positions was $40.6 million, an increase of $7.4 million from December 31, 2020. The increase resulted primarily from a $5.0 million increase in reserves for uncertain tax positions expected to be taken in 2021 and a $2.4 million increase related to prior year positions. Quanta’s consolidated federal income tax return for tax year 2019 is currently under examination by the Internal Revenue Services (IRS), and Quanta’s consolidated federal income tax returns for tax years 2017, 2018, and 2020 remain open to examination by the IRS, as these statute of limitations periods have not yet expired. Additionally, various state and foreign tax returns filed by Quanta and certain subsidiaries for multiple periods remain under examination by various U.S. state and foreign tax authorities. Quanta believes it is reasonably possible that within the next 12 months unrecognized tax benefits may decrease by up to $13.3 million as a result of settlement of these examinations or as a result of the expiration of certain statute of limitations periods.

Fair Value Measurements

For disclosure purposes, qualifying assets and liabilities are categorized into three broad levels based on the priority of the inputs used to determine their fair values. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). Certain assumptions and other information as they relate to these qualifying assets and liabilities are described below.

Goodwill and Other Intangible Assets

Quanta has recorded goodwill and identifiable intangible assets in connection with certain of its historical business acquisitions. Quanta utilizes the fair value premise as the primary basis for its impairment valuation procedures. The Goodwill and Other Intangible Assets sections in Note 2 of the Notes to Consolidated Financial Statements in Item 8. Financial Statements and Supplementary Data in Part II of the 2020 Annual Report provide information regarding valuation methods, including the income approach, market approach and cost approach, and assumptions used to determine the fair value of these assets based on the appropriateness of each method in relation to the type of asset being valued. Quanta believes that the valuation methods it employs appropriately represent the methods that would be used by other market participants in determining fair value, and periodically engages the services of an independent valuation firm when a new business is acquired to assist management with the valuation process, including assistance with the selection of appropriate valuation methodologies and the development of market-based valuation assumptions. The level of inputs used for these fair value measurements is the lowest level (Level 3).

Investments

Equity investments with readily determinable fair values are measured at fair value, with changes in fair value recognized in net income. In cases where those readily determinable values are quoted market prices, the level of input used for these fair value measurements is the highest level (Level 1). Equity investments without readily determinable fair values are measured on a nonrecurring basis. These types of fair market value assessments are similar to other nonrecurring fair value measures used by Quanta, which include the use of significant judgments and available relevant market data. Such market data may include observations of the valuation of comparable companies, risk-adjusted discount rates and an evaluation of the expected

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performance of the underlying portfolio asset, including historical and projected levels of profitability or cash flows. In addition, a variety of additional factors may be reviewed by management, including, but not limited to, contemporaneous financing and sales transactions with third parties, changes in market outlook and the third-party financing environment. The level of inputs used for these fair value measurements is the lowest level (Level 3).

Quanta has investments accounted for using the equity and cost methods of accounting. Quanta utilizes the fair value premise as the basis for its impairment valuation and recognizes impairment if there are sufficient indicators that the fair value of the investment is less than its carrying value.

Financial Instruments

The carrying amounts of cash equivalents, accounts receivable, contract assets, accounts payable, accrued expenses and contract liabilities approximate fair value due to the short-term nature of these instruments. All of Quanta’s cash equivalents were categorized as Level 1 assets at September 30, 2021 and December 31, 2020, as all values were based on unadjusted quoted prices for identical assets in an active market that Quanta has the ability to access.

Long-term Debt

The carrying amount of variable rate debt, which includes borrowings under Quanta’s senior credit facility, approximates fair value. Quanta’s fixed rate debt primarily includes its senior notes. The fair value of Quanta’s senior notes, which are described further in Note 6, was $2.52 billion at September 30, 2021, compared to a carrying value of $2.47 billion net of unamortized bond discount, underwriting discounts and deferred financing costs of $28.3 million. The fair value of the senior notes is based on the quoted market prices for the same issue, and the senior notes are categorized as Level 1 liabilities. See Note 6 for additional information regarding Quanta’s senior credit facility and senior notes.

3. NEW ACCOUNTING PRONOUNCEMENTS:

Adoption of New Accounting Pronouncements

In December 2019, the FASB issued an update that, among other things, amends the guidance related to accounting for tax law changes when an entity has a year-to-date loss in an interim period and provides guidance on how to evaluate whether a step-up in tax basis of goodwill relates to a business combination or a separate transaction. This update is effective for interim and annual periods beginning after December 15, 2020, with certain amendments applied prospectively and other amendments applied on a modified retrospective basis. Quanta adopted this update effective January 1, 2021, and it did not have a material impact on Quanta’s condensed consolidated financial statements at the date of adoption.

In January 2020, the FASB issued an update that clarified the applicable guidance for measurement of the fair value of equity and cost method investments when there is a change in the level of ownership or degree of influence. Quanta adopted this update effective January 1, 2021 and will prospectively apply this update.

4. ACQUISITIONS:

On October 13, 2021, Quanta completed the acquisition of Blattner, a large utility-scale renewable energy infrastructure solutions provider in North America. The consideration for this transaction consisted of approximately $2.29 billion paid in cash on the date of acquisition and 3.3 million shares of Quanta common stock, which had a fair value of $345.4 million as of the date of the acquisition. The final amount of consideration for this acquisition remains subject to certain post-closing adjustments, including with respect to net working capital. Additionally, pursuant to the terms of the agreement and plan of merger, the former owners of Blattner are eligible for the potential payment of up to $300 million of contingent consideration, payable to the extent the acquired business achieves certain financial performance objectives over a three-year period beginning in January 2022. Blattner’s results will be included in Quanta’s consolidated financial statements beginning on the acquisition date. Quanta is in the process of performing procedures to determine the fair value of assets acquired and liabilities assumed related to the acquisition of Blattner, including the fair value assessment of contingent consideration, and will include the preliminary purchase price allocation in its Annual Report on Form 10-K for the year ended December 31, 2021. See Note 6 for additional information regarding the financing of this acquisition.

In addition, in October 2021, Quanta acquired a business located in the United States that provides electric power construction and related services. The aggregate consideration for this acquisition included approximately $50.0 million paid or

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(Unaudited)

payable in cash, subject to certain adjustments, and the issuance of 42,748 shares of common stock, which had a fair value of approximately $4.0 million at the acquisition date.

During the nine months ended September 30, 2021, Quanta acquired a communications services business located in the United States that performs data center connection services; a business located in the United States that designs, develops and holds a certification for the manufacture of personal protective breathing equipment and related monitoring devices primarily used in the refining and petrochemical industries, including in connection with catalyst services; a business located in Canada that provides front-end land services for infrastructure development projects in Canada and the United States; and a business located in the United States that primarily provides horizontal directional drilling services. The aggregate consideration for these acquisitions was $59.2 million paid or payable in cash (subject to certain adjustments) and 32,822 shares of Quanta common stock, which had a fair value of $2.5 million as of the applicable acquisition date.

During the year ended December 31, 2020, Quanta acquired a contractor located in the United States that provides electric power distribution, transmission and substation maintenance and construction, directional boring and emergency restoration services; a professional engineering business located in the United States that provides infrastructure engineering and design services to electric utilities, gas utilities and communications services companies, as well as permitting and utility locating services; a business located in the United States that provides aviation services primarily for the utility industry; an electric power infrastructure business located in the United States that primarily provides underground conduit services; a business located in the United States that specializes in the deployment of short- and long-haul fiber optic cable and utilities; an industrial services business located in Canada that performs catalyst handling services, including changeover and shutdown maintenance, for customers in the refining and chemical industries; and a business located in the United States that provides heavy, civil, industrial and energy related services and specializes in the construction and maintenance of pipelines and metering stations. The aggregate consideration for these acquisitions was $359.6 million paid or payable in cash (subject to certain adjustments) and 1,334,469 shares of Quanta common stock, which had a fair value of $57.1 million as of the respective acquisition dates. Additionally, one of the acquisitions includes the potential payment of up to approximately $6.9 million of contingent consideration, payable if the acquired business achieves certain performance objectives over a five-year post-acquisition period. Based on the estimated fair value of the contingent consideration, Quanta recorded a $2.3 million liability as of the acquisition date.

The results of the businesses acquired as of or prior to September 30, 2021 have been included in Quanta’s consolidated financial statements beginning on the respective acquisition dates, with the results of the manufacturing business, the industrial services business and the business specializing in construction and maintenance of pipelines and metering stations generally included in the Underground Utility and Infrastructure Solutions segment and the results of the remaining businesses generally included in the Electric Power Infrastructure Solutions segment.

The following table summarizes the aggregate consideration paid or payable as of September 30, 2021 for the acquisitions completed in the nine months ended September 30, 2021 and the year ended December 31, 2020 and presents the allocation of these amounts to net tangible and identifiable intangible assets based on their estimated fair values as of the respective acquisition dates, inclusive of any purchase price adjustments. These allocations require significant use of estimates and are based on information that was available to management at the time these condensed consolidated financial statements were prepared. Quanta uses a variety of information to estimate fair values, including quoted market prices, carrying amounts and valuation techniques such as discounted cash flows. When deemed appropriate, third-party appraisal firms are engaged to assist in fair value determination of fixed assets, intangible assets and certain other assets and liabilities.

Quanta is finalizing its fair value assessments for the acquired assets and assumed liabilities related to businesses acquired subsequent to September 30, 2020, and further adjustments to the purchase price allocations may occur. As of September 30, 2021, the estimated fair values of the net assets acquired were preliminary, with possible updates primarily related to tax estimates and inventory. Consideration amounts are also subject to the finalization of closing working capital adjustments. The aggregate consideration paid or payable for businesses acquired between September 30, 2020 and September 30, 2021 was allocated to acquired assets and assumed liabilities, which resulted in an allocation of $136.4 million to net tangible assets, $37.6 million to identifiable intangible assets and $35.3 million to goodwill. The following table summarizes the fair value of

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total consideration transferred or estimated to be transferred and the fair value of assets acquired and liabilities assumed as of September 30, 2021 for acquisitions completed in the year-to-date periods shown below (in thousands).

	September 30, 2021		December 31, 2020
Consideration:
Cash paid or payable	$	59,226	$	359,624
Value of Quanta common stock issued	2,479		57,119
Contingent consideration	—		2,250
Fair value of total consideration transferred or estimated to be transferred	$	61,705	$	418,993
Accounts receivable	$	10,678	$	74,492
Contract assets	2,048		8,919
Other current assets	7,189		53,302
Property and equipment	5,651		143,276
Other assets	216		14
Identifiable intangible assets	18,506		96,827
Contract liabilities	(16)		(3,750)
Other current liabilities	(10,371)		(35,112)
Deferred tax liabilities, net	(2,093)		(3,185)
Total identifiable net assets	31,808		334,783
Goodwill	29,897		84,210
Fair value of net assets acquired	$	61,705	$	418,993

Goodwill represents the amount by which the purchase price for an acquired business exceeds the net fair value of the assets acquired and liabilities assumed. The acquisitions completed in the nine months ended September 30, 2021 and the year ended December 31, 2020 strategically expanded Quanta’s domestic and international underground utility and infrastructure solutions and domestic electric power infrastructure solutions, which Quanta believes contributes to the recognition of goodwill. Approximately $13.3 million and $72.6 million of goodwill is expected to be deductible for income tax purposes related to acquisitions completed in the nine months ended September 30, 2021 and the year ended December 31, 2020.

Quanta’s intangible assets include customer relationships; backlog; trade names; non-compete agreements; patented rights, developed technology, and process certifications; and curriculum, all of which are subject to amortization, as well as an engineering license, which is not subject to amortization. The following table summarizes the estimated fair values of identifiable intangible assets for the acquisitions completed in the nine months ended September 30, 2021 as of the acquisition

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date and the related weighted average amortization periods by asset type (in thousands, except for weighted average amortization periods, which are in years).    

	Estimated Fair Value		Weighted Average Amortization Period in Years
Customer relationships	$	3,063	5.6
Backlog	3,811		1.3
Trade names	1,110		14.4
Non-compete agreements	1,494		5.0
Patented rights, developed technology, and process certifications	9,028		3.5
Total intangible assets subject to amortization	$	18,506	4.2

The significant estimates used by management in determining the fair value of customer relationship intangible assets include future revenues, discount rates and customer attrition rates. The following table includes the discount rates and customer attrition rates used to determine the fair value of customer relationship intangible assets for businesses acquired during the nine months ended September 30, 2021 and the year ended December 31, 2020 as of the respective acquisition dates:

	2021		2020
	Range	Weighted Average	Range	Weighted Average
Discount rates	22% to 25%	22%	19% to 25%	20%
Customer attrition rates	20% to 30%	23%	10% to 43%	13%

The following unaudited supplemental pro forma results of operations for Quanta, which incorporate the acquisitions completed in the three and nine months ended September 30, 2021 and 2020, have been provided for illustrative purposes only and do not purport to be indicative of the actual results that would have been achieved by the combined companies for the periods presented or that may be achieved by the combined companies in the future. Future results may vary significantly from the results reflected in the following pro forma financial information because of future events and transactions, as well as other factors (in thousands, except per share amounts).

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Revenues	$	3,357,877	$	3,069,921	$	9,090,656	$	8,519,226
Gross profit	$	535,935	$	520,866	$	1,367,256	$	1,254,826
Selling, general and administrative expenses	$	(275,363)	$	(256,608)	$	(794,249)	$	(740,564)
Amortization of intangible assets	$	(22,836)	$	(22,843)	$	(68,167)	$	(69,742)
Net income	$	175,865	$	166,326	$	387,713	$	287,171
Net income attributable to common stock	$	174,832	$	165,539	$	383,184	$	282,718
Earnings per share attributable to common stock:
Basic	$	1.25	$	1.17	$	2.73	$	1.98
Diluted	$	1.21	$	1.14	$	2.65	$	1.94

The pro forma combined results of operations for the three and nine months ended September 30, 2021 and 2020 were prepared by adjusting the historical results of Quanta to include the historical results of the acquisitions completed in 2021 as if they occurred January 1, 2020. The pro forma combined results of operations for the three and nine months ended September 30, 2020 were prepared by also adjusting the historical results of Quanta to include the historical results of the acquisitions completed in 2020 as if they occurred January 1, 2019. These pro forma combined historical results were adjusted for the following: a reduction of interest expense as a result of the repayment of outstanding indebtedness of the acquired businesses; an increase in interest expense as a result of the cash consideration paid; an increase in amortization expense due to the incremental intangible assets recorded; elimination of inter-company sales; changes in depreciation expense to adjust acquired property and equipment to the acquisition date fair value and to conform with Quanta’s accounting policies; an increase in the

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number of outstanding shares of Quanta common stock; and reclassifications to conform the acquired businesses’ presentation to Quanta’s accounting policies. The pro forma combined results of operations do not include any adjustments to eliminate the impact of acquisition-related costs or any cost savings or other synergies that resulted or may result from the acquisitions. As noted above, the pro forma results of operations do not purport to be indicative of the actual results that would have been achieved by the combined company for the periods presented or that may be achieved by the combined company in the future.

Revenues of $13.4 million and a loss before income taxes of $0.3 million, which included $2.0 million of acquisition-related costs, related to the acquisitions completed in 2021 are included in Quanta’s condensed consolidated results of operations for the three months ended September 30, 2021. Revenues of $14.6 million and a loss before income taxes of $0.2 million, which included $2.4 million of acquisition-related costs, related to the acquisitions completed in 2021 are included in Quanta’s condensed consolidated results of operations for the nine months ended September 30, 2021. Revenues of $55.2 million and income before income taxes of $1.0 million, which included $10.6 million acquisition-related costs, related to the acquisitions completed in 2020 are included in Quanta’s condensed consolidated results of operations for the three months ended September 30, 2020. Revenues of $63.0 million and income before income taxes of $1.0 million, which included $11.4 million of acquisition-related costs, related to the acquisitions completed in 2020 are included in Quanta’s condensed consolidated results of operations for the nine months ended September 30, 2020.

5. PER SHARE INFORMATION:

The amounts used to compute basic and diluted earnings per share attributable to common stock consisted of the following (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Amounts attributable to common stock:
Net income attributable to common stock	$	174,365	$	162,913	$	381,159	$	275,545
Weighted average shares outstanding:
Weighted average shares outstanding for basic earnings per share attributable to common stock	140,008		140,542		140,134		141,610
Effect of dilutive unvested non-participating stock-based awards	4,296		3,821		4,314		3,375
Weighted average shares outstanding for diluted earnings per share attributable to common stock	144,304		144,363		144,448		144,985

Basic and diluted earnings per share attributable to common stock are computed using the weighted average number of shares of common stock outstanding during the applicable period. Unvested stock-based awards that contain non-forfeitable rights to dividends or dividend equivalents (participating securities) have been included in the calculation of basic and diluted earnings per share attributable to common stock for the portion of the periods that the awards were outstanding. Weighted average shares outstanding for basic and diluted earnings per share attributable to common stock included 0.5 million and 1.4 million weighted average participating securities for the three months ended September 30, 2021 and 2020 and 0.7 million and 1.7 million weighted average participating securities for the nine months ended September 30, 2021 and 2020.

For purposes of calculating diluted earnings per share attributable to common stock, there were no adjustments required to derive Quanta’s net income attributable to common stock. Diluted earnings per share attributable to common stock is computed using the weighted average number of shares of common stock outstanding during the period adjusted for all potentially dilutive common stock equivalents, except in cases where the effect of the common stock equivalents would be antidilutive.

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6. DEBT OBLIGATIONS:

Quanta’s long-term debt obligations consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
0.950% Senior Notes due October 2024	$	500,000	$	—
2.900% Senior Notes due October 2030	1,000,000		1,000,000
2.350% Senior Notes due January 2032	500,000		—
3.050% Senior Notes due October 2041	500,000		—
Borrowings under senior credit facility	415,851		148,508
Other long-term debt	51,366		46,981
Finance leases	2,253		2,228
Unamortized discount and deferred financing costs related to senior notes	(28,289)		(12,892)
Total long-term debt obligations	2,941,181		1,184,825
Less — Current maturities of long-term debt	10,276		10,531
Total long-term debt obligations, net of current maturities	$	2,930,905	$	1,174,294

Quanta’s current maturities of long-term debt and short-term debt consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Short-term debt	$	13,472	$	4,233
Current maturities of long-term debt	10,276		10,531
Current maturities of long-term debt and short-term debt	$	23,748	$	14,764

Senior Notes

On September 23, 2021, Quanta issued $1.50 billion aggregate principal amount of senior notes consisting of: $500.0 million aggregate principal amount of 0.950% senior notes due October 2024 (the 2024 notes); $500.0 million aggregate principal amount of 2.350% senior notes due January 2032 (the 2032 notes); and $500.0 million aggregate principal amount of 3.050% senior notes due October 2041 (the 2041 notes). The cumulative proceeds received from the public offering of the 2024 notes, the 2032 notes and the 2041 notes were $1.48 billion, net of the original issue discount, underwriting discounts and deferred financing costs, which were used, along with drawings under Quanta’s senior credit facility, as amended, to acquire Blattner. Additionally, on September 22, 2020, Quanta issued $1.00 billion aggregate principal amount of 2.900% senior notes due October 2030 (the 2030 notes, and together with the 2024 notes, the 2032 notes and the 2041 notes, collectively the Senior Notes) and received proceeds of $986.7 million from the offering, net of the original issue discount, underwriting discounts and deferred financing costs.

Interest on the Senior Notes is payable semi-annually in arrears as set forth below (dollars in thousands).

Title of the Notes	Interest Amount		Payment Dates	Commencement Date
0.950% Senior Notes due October 2024	$	2,375	April 1 and October 1	April 1, 2022
2.900% Senior Notes due October 2030	$	14,500	April 1 and October 1	April 1, 2021
2.350% Senior Notes due January 2032	$	5,875	January 15 and July 15	July 15, 2022
3.050% Senior Notes due October 2041	$	7,625	April 1 and October 1	April 1, 2022

In each case as further specified by the terms of the Senior Notes and the indenture and supplemental indentures governing the Senior Notes (collectively, the indenture), Quanta may redeem all or a portion of (i) the 2024 notes at any time prior to October 1, 2022 at a price equal to 100% of the principal amount plus a make-whole premium and accrued and unpaid interest, and at any time on or after October 1, 2022 at a price equal to 100% of the principal amount plus accrued and unpaid interest; (ii) the 2030 notes at any time prior to July 1, 2030 at a price equal to 100% of the principal amount plus a make-whole premium and accrued and unpaid interest, and at any time on or after July 1, 2030 at a price equal to 100% of the principal amount plus accrued and unpaid interest; (iii) the 2032 notes at any time prior to October 15, 2031 at a price equal to 100% of the principal amount plus a make-whole premium and accrued and unpaid interest, and at any time on or after October 15, 2031

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at a price equal to 100% of the principal amount plus accrued and unpaid interest; and (iv) the 2041 notes at any time prior to April 1, 2041 at a price equal to 100% of the principal amount plus a make-whole premium and accrued and unpaid interest, and at any time on or after April 1, 2041 at a price equal to 100% of the principal amount plus accrued and unpaid interest.

Upon the occurrence of a Change of Control Triggering Event (as defined in the indenture), unless Quanta has exercised its right to redeem the applicable series of Senior Notes in full by giving irrevocable notice to the trustee, each holder of such Senior Notes will have the right to require Quanta to purchase all or a portion of such holder’s Senior Notes of such series at a purchase price equal to 101% of the principal amount thereof plus accrued and unpaid interest.

The indenture contains covenants that, among other things, limit Quanta’s ability to incur liens securing certain indebtedness, to engage in certain sale and leaseback transactions with respect to certain properties and to sell all or substantially all of Quanta’s assets or merge or consolidate with or into other companies. The indenture also contains customary events of default.

Senior Credit Facility

October 2021 Amendment

On October 8, 2021, Quanta entered into an amendment to the credit agreement for its senior credit facility (the Amended Credit Agreement) that, among other things, (i) provided for a new $750.0 million term loan facility for the purpose of financing, in whole or in part, the acquisition of Blattner pursuant to the agreement and plan of merger, refinancing certain existing indebtedness of Blattner and paying certain related costs and expenses, (ii) increased the aggregate revolving commitments from $2.51 billion to $2.64 billion and (iii) extended the maturity date for revolving commitments under the senior credit facility from September 22, 2025 to October 8, 2026, which is also the maturity date for the new term loan facility. The amendment also increased the threshold amount for cross-defaults to certain debt instruments and for certain other purposes from $150.0 million to $300.0 million. After giving effect to the amendment, the aggregate amount of the credit facilities provided for under the Amended Credit Agreement is $3.39 billion.

On October 13, 2021, Quanta borrowed the full amount of the $750.0 million term loan facility and used such amount, together with the net proceeds from the September 2021 offering of the 2024 notes, the 2032 notes and the 2041 notes and approximately $50.9 million of revolving loans borrowed under the senior credit facility, to pay the cash consideration for the acquisition of Blattner, as further described in Note 4.

Quanta is required to make quarterly principal payments on the first business day of each January, April, July and October, beginning in January 2023, on outstanding borrowings under the new term loan facility in an amount equal to $4.7 million per quarter in 2023 and 2024, $9.4 million per quarter in 2025 and $18.8 million per quarter in 2026. The aggregate remaining principal amount outstanding for the new term loan facility must be paid on the maturity date of the senior credit facility. Quanta may voluntarily prepay the term loan borrowings from time to time, in whole or in part, without premium or penalty.

Amounts borrowed under the new term loan facility bear interest, at Quanta’s option, at a rate equal to either (a) the LIBOR Rate (as defined in the Amended Credit Agreement) plus 1.000% to 1.625%, or (b) the Base Rate (as defined below) plus 0.000% to 0.625%, each as determined based on either Quanta’s Consolidated Leverage Ratio (as described below) or Quanta’s Debt Rating (as defined in the Amended Credit Agreement), whichever is more favorable to Quanta. The Consolidated Leverage Ratio is the ratio of Quanta’s total funded debt to Consolidated EBITDA (as defined in the Amended Credit Agreement). For purposes of calculating the Consolidated Leverage Ratio, total funded debt is reduced by available cash and Cash Equivalents (as defined in the Amended Credit Agreement) in excess of $25.0 million. The Base Rate equals the highest of (i) the Federal Funds Rate (as defined in the Amended Credit Agreement) plus 0.5%, (ii) Bank of America’s prime rate and (iii) the LIBOR Rate plus 1.00%.

Beginning October 8, 2021, amounts borrowed in U.S. dollars under the revolving credit facility bear interest, at Quanta’s option, at a rate equal to either (a) the LIBOR Rate plus 1.125% to 1.750%, or (b) the Base Rate plus 0.125% to 0.750%, each as determined based on either Quanta’s Consolidated Leverage Ratio or its Debt Rating, whichever is more favorable to Quanta. Revolving loans borrowed in any currency other than U.S. dollars bear interest at a rate equal to the Alternative Currency Daily Rate or the Alternative Currency Term Rate (each as defined in the Amended Credit Agreement), as applicable, plus 1.125% to 1.750%, as determined based on either Quanta’s Consolidated Leverage Ratio or Quanta’s Debt Rating, whichever is more favorable to Quanta. Additionally, standby or commercial letters of credit issued under the Amended Credit Agreement are subject to a letter of credit fee of 1.125% to 1.750%; Performance Letters of Credit (as defined in the Amended Credit Agreement) issued under the Amended Credit Agreement in support of certain contractual obligations are subject to a letter of credit fee of 0.675% to 1.125%; and Quanta is subject to a commitment fee of 0.100% to 0.275% on any unused

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availability under the revolving credit facility, in each case as determined based on either the Quanta’s Consolidated Leverage Ratio or its Debt Rating, whichever is more favorable to Quanta.

The Amended Credit Agreement contains certain covenants, including, as of the end of any fiscal quarter of Quanta, (i) a maximum Consolidated Leverage Ratio (as defined in the Amended Credit Agreement) of 3.5 to 1.0 (except that in connection with certain permitted acquisitions in excess of $200.0 million, including Quanta’s acquisition of Blattner, such ratio is 4.0 to 1.0 for the fiscal quarter in which the acquisition is completed and the four subsequent fiscal quarters) and (ii) a minimum Consolidated Interest Coverage Ratio (as defined in the Amended Credit Agreement) of 3.0 to 1.0.

As of and for the three and nine months ended September 30, 2021

As of September 30, 2021, Quanta had $415.9 million of outstanding revolving loans under its senior credit facility. Of the total outstanding borrowings, $239.7 million were denominated in Canadian dollars, $142.2 million were denominated in U.S. dollars and $34.0 million were denominated in Australian dollars. As of September 30, 2021, Quanta also had $333.9 million of letters of credit issued under the senior credit facility, of which $92.8 million were denominated in currencies other than the U.S. dollar, primarily Canadian dollars. As of September 30, 2021, subject to the applicable sublimits and other terms and conditions, the remaining $1.76 billion of available commitments under the senior credit facility was available for loans or issuing new letters of credit in U.S. dollars and certain alternative currencies.

Borrowings under the senior credit facility and the applicable interest rates were as follows (dollars in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2021			2020			2021			2020
Maximum amount outstanding	$	517,883		$	1,462,069		$	576,993		$	2,023,326
Average daily amount outstanding	$	416,089		$	1,255,171		$	360,609		$	1,395,207
Weighted-average interest rate	2.13		%	1.57		%	2.05		%	2.13		%

As of September 30, 2021, Quanta was in compliance with all of the financial covenants under its senior credit facility.

Bridge Facility Commitment

On September 1, 2021, in connection with the signing of the merger agreement for the acquisition of Blattner, Quanta entered into a commitment letter, pursuant to which certain lenders committed to provide a 364-day senior unsecured bridge facility in an aggregate principal amount of up to $2.18 billion to finance the cash consideration estimated to be due at closing of the acquisition of Blattner and to pay fees and expenses incurred in connection therewith. On September 23, 2021, in accordance with the terms of the commitment letter, the aggregate commitments under the commitment letter were reduced to approximately $696.1 million concurrently with Quanta’s issuance of the 2024 notes, the 2032 notes and the 2041 notes. Additionally, concurrent with the amendment to Quanta’s senior credit facility, the remaining aggregate commitments under the commitment letter were reduced to zero and the commitment was terminated.

During the three months ended September 30, 2021, Quanta paid $4.4 million of fees to the lenders related to the bridge facility commitment, $3.1 million of which was amortized to interest expense in the three months ended September 30, 2021 and $1.3 million of which was recorded as deferred financing costs as of September 30, 2021 and will be amortized to interest expense in the three months ending December 31, 2021.

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7. LEASES:

Quanta primarily leases land, buildings, vehicles, construction equipment and office equipment. The components of lease costs in the accompanying condensed consolidated statements of operations are as follows (in thousands):

		Three Months Ended				Nine Months Ended
		September 30,				September 30,
Lease cost	Classification	2021		2020		2021		2020
Finance lease cost:
Amortization of lease assets	Depreciation (1)	$	231	$	53	$	705	$	515
Interest on lease liabilities	Interest expense	18		16		68		50
Operating lease cost	Cost of services and Selling, general and administrative expenses	25,323		29,577		80,046		89,289
Short-term and variable lease cost (2)	Cost of services and Selling, general and administrative expenses	176,605		160,365		494,846		478,683
Total lease cost		$	202,177	$	190,011	$	575,665	$	568,537

(1)    Depreciation is included within “Cost of services” and “Selling, general and administrative expenses” in the accompanying condensed consolidated statements of operations.

(2)    Short-term lease cost includes both leases and rentals with initial terms of one year or less. Variable lease cost is insignificant and primarily relates to real estate leases and consists of common area maintenance charges, real estate taxes, insurance and other variable costs.

Quanta has entered into arrangements with certain related parties to lease certain real property and facilities. Typically, the parties are employees of Quanta who are also the former owners of businesses acquired by Quanta, and the real properties and facilities continue to be utilized by Quanta subsequent to the acquisitions. Quanta utilizes third party market valuations to evaluate rental rates for these properties and facilities, and the lease agreements generally have remaining lease terms of up to 10 years, subject to renewal options. Related party lease expense was $2.4 million and $4.5 million for the three months ended September 30, 2021 and 2020 and $10.4 million and $13.2 million for the nine months ended September 30, 2021 and 2020.

Future minimum lease payments for operating and finance leases were as follows (in thousands):

	As of September 30, 2021
	Operating Leases		Finance Leases		Total
Remainder of 2021	$	23,964	$	296	$	24,260
2022	80,516		872		81,388
2023	58,265		666		58,931
2024	36,341		409		36,750
2025	24,449		126		24,575
Thereafter	36,996		—		36,996
Total future minimum operating and finance lease payments	$	260,531	$	2,369	$	262,900
Less imputed interest	(20,342)		(116)		(20,458)
Total lease liabilities	$	240,189	$	2,253	$	242,442

Future minimum lease payments for short-term leases, which are not recorded in the condensed consolidated balance sheets due to Quanta’s accounting policy election, were $18.7 million as of September 30, 2021. Month-to-month rental expense associated primarily with certain equipment rentals is excluded from these amounts because Quanta is unable to accurately predict future rental amounts.

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The weighted average remaining lease terms and discount rates were as follows:

	As of September 30, 2021
Weighted average remaining lease term (in years):
Operating leases	4.16
Finance leases	2.90
Weighted average discount rate:
Operating leases	3.9	%
Finance leases	3.7	%

Quanta has also guaranteed the residual value under certain of its equipment operating leases, agreeing to pay any difference between this residual value and the fair market value of the underlying asset at the date of lease termination. As of September 30, 2021, the maximum guaranteed residual value of this equipment was $886.9 million. While Quanta believes that no significant payments will be made as a result of these residual value guarantees, there can be no assurance that significant payments will not be required in the future.

As of September 30, 2021, Quanta had additional operating lease obligations of $6.4 million for leases that had not yet commenced but that are expected to commence in 2021 and have lease terms of one to seven years.

8. EQUITY:

Stock repurchases

Quanta repurchased the following shares of common stock in the open market under the stock repurchase programs (in thousands):

Quarter ended:	Shares	Amount
September 30, 2021	185	$	16,828
June 30, 2021	314	$	29,450
March 31, 2021	222	$	17,710
December 31, 2020	720	$	49,949
September 30, 2020	—	$	—
June 30, 2020	—	$	—
March 31, 2020	5,960	$	200,000

As of September 30, 2021, Quanta is authorized to repurchase up to an additional $472.8 million in shares of common stock through June 30, 2023 under its existing stock repurchase program. Quanta’s policy is to record a stock repurchase as of the trade date; however, the payment of cash related to the repurchase is made on the settlement date of the trade. During the three months ended September 30, 2021 and 2020, cash payments related to stock repurchases were $17.8 million and none, and during the nine months ended September 30, 2021 and 2020, cash payments related to stock repurchases were $66.7 million and $200.0 million.

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Dividends

Quanta declared the following cash dividends and cash dividend equivalents during 2020 and the first nine months of 2021 (in thousands, except per share amounts):

Declaration	Record	Payment	Dividend		Dividends
Date	Date	Date	Per Share		Declared
August 27, 2021	October 1, 2021	October 15, 2021	$	0.06	$	8,638
May 27, 2021	July 1, 2021	July 15, 2021	$	0.06	$	8,650
March 25, 2021	April 6, 2021	April 15, 2021	$	0.06	$	8,429
December 11, 2020	January 4, 2021	January 15, 2021	$	0.06	$	8,933
August 26, 2020	October 1, 2020	October 15, 2020	$	0.05	$	7,244
May 28, 2020	July 1, 2020	July 15, 2020	$	0.05	$	7,182
March 26, 2020	April 6, 2020	April 15, 2020	$	0.05	$	7,184

9. STOCK-BASED COMPENSATION:

Quanta has stock-based compensation awards outstanding under two equity incentive plans, the Quanta Services, Inc. 2011 Omnibus Equity Incentive Plan and the Quanta Services, Inc. 2019 Omnibus Equity Incentive Plan. For descriptions and further information regarding these plans, refer to Note 12 of the Notes to Consolidated Financial Statements in Item 8. Financial Statements and Supplementary Data in Part II of the 2020 Annual Report.

RSUs to be Settled in Common Stock

A summary of the activity for RSUs to be settled in common stock for the nine months ended September 30, 2021 and 2020 is set forth below (shares in thousands):

	2021		2020
	RSUs	Weighted Average Grant Date Fair Value (Per share)	RSUs	Weighted Average Grant Date Fair Value (Per share)
Unvested at January 1	3,869	$37.57	3,265	$35.34
Granted	945	$82.75	2,008	$39.65
Vested	(1,442)	$36.92	(1,228)	$35.68
Forfeited	(119)	$47.23	(114)	$36.26
Unvested at period ended September 30	3,253	$50.71	3,931	$37.41

The grant date fair value for RSUs to be settled in common stock is based on the closing price of Quanta’s common stock on the date of grant. The approximate fair values of RSUs settled in common stock during the nine months ended September 30, 2021 and 2020 were $121.7 million and $48.8 million.

During the nine months ended September 30, 2021 and 2020, Quanta recognized $48.8 million and $41.0 million of non-cash stock-based compensation expense related to RSUs to be settled in common stock. Such expense is recorded in “Selling, general and administrative expenses.” As of September 30, 2021, there was $101.0 million of total unrecognized compensation expense related to unvested RSUs to be settled in common stock granted to both employees and non-employees. This cost is expected to be recognized over a weighted average period of 2.21 years.

In October 2021, subsequent to Quanta’s acquisition of Blattner, Quanta granted 0.7 million RSUs to be settled in common stock, which had a fair market value of $72.3 million at the date of grant, to certain employees of Blattner that are continuing as employees after the acquisition. These awards are subject to forfeiture, restrictions on transfer and certain other conditions until vesting, which occurs in annual installments over periods ranging from five to ten years following the date of grant.

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PSUs to be Settled in Common Stock

A summary of the activity for PSUs to be settled in common stock for the nine months ended September 30, 2021 and 2020 is set forth below (shares in thousands):

	2021		2020
	PSUs	Weighted Average Grant Date Fair Value (Per share)	PSUs	Weighted Average Grant Date Fair Value (Per share)
Unvested at January 1	1,047	$37.65	848	$33.20
Granted	174	$90.44	436	$34.59
Vested	(268)	$38.28	(238)	$17.48
Forfeited	(11)	$36.90	—	N/A
Unvested at September 30	942	$47.27	1,046	$37.35

The grant date fair value for PSUs is determined as follows: (i) for the portion of the awards based on company financial and operational performance metrics, by utilizing the closing price of Quanta’s common stock on the date of grant and (ii) for the portion of the awards based on total shareholder return, by utilizing a Monte Carlo simulation valuation methodology. The Monte Carlo simulation valuation methodology applied the following key inputs:

	2021		2020
Valuation date price based on March 25, 2021 and March 26, 2020 closing stock prices of Quanta common stock	$83.48		$31.49
Expected volatility	36	%	34	%
Risk-free interest rate	0.26	%	0.35	%
Term in years	2.77		2.76

During the nine months ended September 30, 2021 and 2020, Quanta recognized $15.4 million and $17.4 million in compensation expense associated with PSUs. Such expense is recorded in “Selling, general and administrative expenses.” During both the nine months ended September 30, 2021 and 2020, 0.5 million shares of common stock were earned and either issued or deferred for future issuance in connection with PSUs.

RSUs to be Settled in Cash

Compensation expense related to RSUs to be settled in cash was $13.7 million and $5.3 million for the nine months ended September 30, 2021 and 2020. Such expense is recorded in “Selling, general and administrative expenses.” RSUs that are anticipated to be settled in cash are not included in the calculation of weighted average shares outstanding for earnings per share, and the estimated earned value of such RSUs is classified as a liability. Quanta paid $13.2 million and $4.3 million to settle liabilities related to cash-settled RSUs in the nine months ended September 30, 2021 and 2020. Accrued liabilities for the estimated earned value of outstanding RSUs to be settled in cash were $7.4 million and $8.7 million at September 30, 2021 and December 31, 2020.

10. COMMITMENTS AND CONTINGENCIES:

Investments in Affiliates and Other Entities

As described in Note 2, Quanta holds investments in various entities, including joint venture entities that provide infrastructure-related services under specific customer contracts and partially owned entities that own, operate and/or maintain certain infrastructure assets. As of September 30, 2021, Quanta had committed to contribute $13.6 million to certain new investments in joint venture entities. The timing of such contributions is not certain, but they are expected to occur in the next twelve months.

If losses are incurred by entities in which Quanta holds an interest, they are generally shared ratably based on the percentage ownership of the participants in the structures. However, in Quanta’s joint venture structures that provide infrastructure-related services, each participant is typically jointly and severally liable for all of the obligations of the joint venture entity pursuant to the contract with the customer, and therefore Quanta can be liable for full performance of the contract with the customer. Additionally, in circumstances where Quanta’s participation in a joint venture qualifies as a general

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partnership, Quanta can be liable for all obligations of the joint venture, including obligations owed to the customer or any other person or entity. Quanta is not aware of circumstances that would lead to future claims against it for material amounts in connection with these liabilities. Additionally, typically each joint venture participant agrees to indemnify the other participant for any liabilities incurred in excess of what the other participant is obligated to bear under the respective joint venture agreement or in accordance with the scope of work subcontracted to each participant. It is possible, however, that Quanta could be required to pay or perform obligations in excess of its share if another participant is unable or refuses to pay or perform its share of the obligations. Quanta is not aware of circumstances that would lead to future claims against it for material amounts that would not be indemnified. However, to the extent any such claims arise, they could be material and could adversely affect Quanta’s consolidated business, financial condition, results of operations and cash flows.

Committed Expenditures

Quanta has capital commitments for the expansion of its equipment fleet in order to accommodate manufacturer lead times on certain types of vehicles. As of September 30, 2021, Quanta had $58.5 million of production orders with expected delivery dates in the fourth quarter of 2021 and $106.9 million of production orders with expected delivery dates in 2022, $68.4 million of which is anticipated to occur in the first half of 2022. Although Quanta has committed to purchase these vehicles at the time of their delivery, Quanta anticipates that the majority of these orders will be assigned to third party leasing companies and made available under certain master equipment lease agreements, thereby releasing Quanta from its equipment purchase commitments.

Legal Proceedings

Quanta is from time to time party to various lawsuits, claims and other legal proceedings that arise in the ordinary course of business. These actions typically seek, among other things, compensation for alleged personal injury, property damage, breach of contract, negligence or gross negligence, environmental liabilities, wage and hour and other employment-related damages, punitive damages, consequential damages, civil penalties or other losses, or injunctive or declaratory relief. With respect to all such lawsuits, claims and proceedings, Quanta records a reserve when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. In addition, Quanta discloses matters for which management believes a material loss is at least reasonably possible. Except as otherwise stated below, none of these proceedings are expected to have a material adverse effect on Quanta’s consolidated financial position, results of operations or cash flows. In all instances, management has assessed the matter based on current information and made a judgment concerning its potential outcome, giving due consideration to the nature of the claim, the amount and nature of damages sought and the probability of success. Management’s judgment may prove materially inaccurate, and such judgment is made subject to the known uncertainties of litigation.

Peru Project Dispute

In 2015, Redes Andinas de Comunicaciones S.R.L. (Redes), a majority-owned subsidiary of Quanta, entered into two separate contracts with an agency of the Peruvian Ministry of Transportation and Communications (MTC), currently Programa Nacional de Telecomunicaciones (PRONATEL), as successor to Fondo de Inversion en Telecomunicaciones (FITEL), pursuant to which Redes would design, construct and operate certain telecommunication networks in rural regions of Peru. The aggregate consideration provided for in the contracts was approximately $248 million, consisting of approximately $151 million to be paid during the construction period and approximately $97 million to be paid during a 10-year post-construction operation and maintenance period. At the beginning of the project, FITEL made advance payments totaling approximately $87 million to Redes, which were secured by two on-demand advance payment bonds posted by Redes to guarantee proper use of the payments in the execution of the project. Redes also provided two on-demand performance bonds in the aggregate amount of $25 million to secure performance of its obligations under the contracts.

During the construction phase, the project experienced numerous challenges and delays, primarily related to issues which Quanta believes were outside of the control of and not attributable to Redes, including, among others, weather-related issues, local opposition to the project, permitting delays, the inability to acquire clear title to certain required parcels of land and other delays which Quanta believes were attributable to FITEL/PRONATEL. In response to various of these challenges and delays, Redes requested and received multiple extensions to certain contractual deadlines and relief from related liquidated damages. However, in April 2019, PRONATEL provided notice to Redes claiming that Redes was in default under the contracts due to the delays and that PRONATEL would terminate the contracts if the alleged defaults were not cured. Redes responded by claiming that it was not in default, as the delays were due to events not attributable to Redes, and therefore PRONATEL was not entitled to terminate the contracts. PRONATEL subsequently terminated the contracts for alleged cause prior to completion of Redes’ scope of work, exercised the on-demand performance bonds and advance payment bonds against Redes, and indicated its intention to claim damages, including a verbal allegation of approximately $45 million of liquidated damages

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under the contracts. In August 2020, Redes received a formal claim from PRONATEL for liquidated damages in the amount of approximately $38 million, which represents the U.S. dollar equivalent of the amount asserted based on the September 30, 2021 exchange rate.

In May 2019, Redes filed for arbitration before the Court of International Arbitration of the International Chamber of Commerce (ICC) against PRONATEL and the MTC. In the arbitration, Redes claims that PRONATEL: breached and wrongfully terminated the contracts; wrongfully executed the advance payment bonds and the performance bonds; and is not entitled to the alleged amount of liquidated damages. In addition, Redes is seeking compensation for all damages arising from PRONATEL’s actions, including but not limited to (i) repayment of the amounts collected by PRONATEL under the advance payment bonds and the performance bonds; (ii) payment of amounts owed for work completed by Redes under the contracts; (iii) lost income in connection with Redes’ future operation and maintenance of the networks; and (iv) other related costs and damages to Redes as a result of the breach and improper termination of the contracts (including construction costs caused by the delays and costs related to the transfer of the networks). The amount claimed by Redes in this arbitration is approximately $190 million. In May 2021, PRONATEL and the MTC filed their counter memorial and counterclaims in the ICC arbitration, requesting: (i) that Redes’ claims for breach of contract be rejected; (ii) a declaration that the execution of the advance payment bonds and the performance bonds was valid, and that the funds may be applied towards any debt owed by Redes; (iii) a declaration that the liquidated damages asserted by PRONATEL apply; (iv) that Redes’ claim for payment of amounts owed for work completed as a result of contractual reconciliation of balances be rejected and that any reconciliation of balances approved by the arbitration panel exclude the funds from the performance bonds; (v) that Redes’ claims for damages be rejected; (vi) a declaration that the contract terminations by PRONATEL were valid; and (vii) that Redes reimburse all funds it received from PRONATEL. In addition, PRONATEL alleges that Redes did not satisfy the contractual requirements for the transfer of the networks, which Redes disputes. In July 2021, Redes filed its statement of defense in reply to the counter memorial and counterclaims of PRONATEL and the MTC, in which it disputes all claims made by PRONATEL and the MTC and maintains the positions on its claims against PRONATEL and the MTC in the arbitration. In August 2021, PRONATEL and the MTC filed a rejoinder statement with their position on the merits and damages, which did not present any new claims, and in October 2021, Redes filed a rejoinder with respect to the counterclaims of PRONATEL and the MTC. The arbitration hearing on the merits is presently scheduled to take place in November 2021.

As of the date of the contract terminations, Redes had incurred costs of approximately $157 million related to the design and construction of the project and had received approximately $100 million of payments (inclusive of the approximately $87 million advance payments). Furthermore, upon completion of the transfer of the networks (as completed at the time of the contract terminations) to PRONATEL, which was required upon termination of the contracts and was completed in 2020, PRONATEL and the MTC are able to possess the networks, for which PRONATEL has paid approximately $100 million while also collecting approximately $112 million of bond proceeds. Quanta believes that PRONATEL’s actions represent an abuse of power and unfair and inequitable treatment and that PRONATEL and the MTC have been unjustly enriched. Specifically, under the terms of the contracts, the advance payment bonds were to be exercised only if it is determined that Redes did not use the advance payments for their intended purpose, in which case Redes would be obligated to return the portion of the advance payments not properly used. In connection with PRONATEL exercising the bonds, Redes was not afforded the opportunity to provide evidence of its proper use of the advance payments for project expenditures. Redes has incurred substantially more than the advance payment amounts in the execution of the project, and Quanta believes Redes has used the advance payment amounts for their intended purpose.

Quanta believes Redes is entitled to all amounts described in its claims above and intends to vigorously pursue those claims in the pending ICC arbitration proceeding. However, as a result of the contract terminations and the inherent uncertainty involved in arbitration proceedings and recovery of amounts owed, there can be no assurance that Redes will prevail on those claims or in defense of liquidated damages claims or any other claims asserted by PRONATEL. As a result, during the three months ended June 30, 2019, Quanta recorded a charge to earnings of $79.2 million, which included a reduction of previously recognized earnings on the project, a reserve against a portion of the project costs incurred through the project termination date, an accrual for a portion of the alleged liquidated damages, and the estimated costs to complete the project turnover and close out the project. The reduction of previously recognized earnings on the project included $14.5 million related to the correction of prior period errors associated with the determination of total estimated project costs and the resulting revenue recognized. Quanta assessed the materiality of the prior period errors and determined that the errors were immaterial individually and in the aggregate to its previously issued financial statements.

As of September 30, 2021, after taking into account the above charge, Quanta had a contract receivable of approximately $120 million related to the project, which includes the approximately $87 million PRONATEL collected through exercise of the advance payment bonds. The contract receivable from PRONATEL is included in “Other assets, net” in the accompanying condensed consolidated balance sheet as of September 30, 2021.

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Quanta also reserves the right to seek full compensation for the loss of its investment under applicable legal regimes, including investment treaties and customary international law, as well as to seek resolution through direct discussions with PRONATEL or the MTC. In connection with these rights, in May 2020 Quanta’s Dutch subsidiary delivered to the Peruvian government an official notice of dispute arising from the termination of the contracts and related acts by PRONATEL (which are attributable to Peru) under the Agreement on the Encouragement and Reciprocal Protection of Investments between the Kingdom of the Netherlands and the Republic of Peru (Investment Treaty). The Investment Treaty protects Quanta’s subsidiary’s indirect ownership stake in Redes and the project, and provides for rights and remedies distinct from the ICC arbitration. In December 2020, Quanta’s Dutch subsidiary filed a request for the institution of an arbitration proceeding against Peru with the International Centre for Settlement of Investment Disputes (ICSID) related to Peru’s breach of the Investment Treaty, which was registered by ICSID in January 2021. In the ICSID arbitration, Quanta’s Dutch subsidiary claims, without limitation, that Peru: (i) treated the subsidiary’s investment in Redes and the project unfairly and inequitably; and (ii) effectively expropriated the subsidiary’s investment in Redes and the project. In addition, Quanta’s Dutch subsidiary is seeking full compensation for all damages arising from Peru’s actions, including but not limited to (i) the fair market value of the investment and/or lost profits; (ii) attorneys’ fees and arbitration costs; (iii) other related costs and damages and (iv) pre- and post-award interest.

If Quanta is not successful in the pending arbitration proceedings, including the ICC arbitration scheduled for November 2021, this matter could result in an additional significant loss that could have a material adverse effect on Quanta’s consolidated results of operations and cash flows. However, based on the information currently available and the status of the pending arbitration proceedings, Quanta is not able to determine a range of reasonably possible additional loss, if any, with respect to this matter.

Maurepas Project Dispute

During the third quarter of 2017, Maurepas Pipeline, LLC (Maurepas) notified QPS Engineering, LLC (QPS), a subsidiary of Quanta, of its claim for liquidated damages allegedly arising from delay in mechanical completion of a project in Louisiana. Quanta disputes the claim and believes that QPS is not responsible for liquidated damages under the contract terms, and in June 2019 QPS filed suit against SemGroup Corporation (now Energy Transfer LP), the parent company of Maurepas, under the parent guarantee issued to secure payment from Maurepas on the project. QPS is seeking to recover $22 million that it believes has been wrongfully withheld, which represents the maximum liability for liquidated damages pursuant to the contract terms. In July and August 2018, QPS also received notice from Maurepas claiming certain warranty defects on the project. In July 2019, Maurepas filed suit against QPS and Quanta, pursuant to a parent guarantee, for damages related to the alleged warranty defects and for a declaratory judgment related to the liquidated damages claim, subsequently claiming approximately $59 million in damages related to a portion of the alleged warranty defects. The lawsuits relating to these claims have been consolidated and are pending in the Tulsa County District Court in Oklahoma. Quanta is continuing to evaluate the claimed warranty defects and, if they exist, the appropriate remedy. At this time, Quanta disputes the extent of the alleged defects or has not been able to substantiate them.

As of September 30, 2021, Quanta had recorded an accrual with respect to this matter based on its current estimated amount of probable loss. Based on the information currently available, including documentation received in the discovery process, Quanta estimates the range of additional reasonably possible loss in connection with this matter is between no additional loss and the amount claimed by Maurepas with respect to the alleged warranty defects and liquidated damages, less the accrued amount. Upon final resolution of this matter, any liquidated damages or warranty defect damages in excess of Quanta’s current loss accrual would be recorded as additional costs on the project.

Lorenzo Benton v. Telecom Network Specialists, Inc., et al.

In June 2006, plaintiff Lorenzo Benton filed a class action complaint in the Superior Court of California, County of Los Angeles, alleging various wage and hour violations against Telecom Network Specialists (TNS), a former subsidiary of Quanta. Quanta retained liability associated with this matter pursuant to the terms of Quanta’s sale of TNS in December 2012. Benton represents a class of workers that includes all persons who worked on certain TNS projects, including individuals that TNS retained through numerous staffing agencies. The plaintiff class in this matter is seeking damages for unpaid wages, penalties associated with the failure to provide meal and rest periods and overtime wages, interest and attorneys’ fees. In January 2017, the trial court granted a summary judgment motion filed by the plaintiff class and found that TNS was a joint employer of the class members and that it failed to provide adequate meal and rest breaks and failed to pay overtime wages. During 2019 and 2020, the parties filed additional summary judgment and other motions and a bench trial on liability and damages was held. Liability and damages have been determined by the trial court, with the amount of liability for TNS, including interest through the date of the trial court’s orders, determined to be approximately $9.5 million. Quanta believes the court’s decisions on liability and damages are not supported by controlling law and continues to contest its liability and the damage calculation

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asserted by the plaintiff class in this matter. The amount determined by the trial court includes damages and interest, but does not include attorneys’ fees or costs. In July 2021, the plaintiff class filed a motion for approval of approximately $37.0 million in attorneys’ fees, and in October 2021, Quanta filed a response to the motion opposing approval of substantially all of the claimed attorneys’ fees.

Additionally, in November 2007, TNS filed cross complaints for indemnity and breach of contract against the staffing agencies, which employed many of the individuals in question. In December 2012, the trial court heard cross-motions for summary judgment filed by TNS and the staffing agencies pertaining to TNS’s demand for indemnity. The court denied TNS’s motion and granted the motions filed by the staffing agencies; however, the California Appellate Court reversed the trial court’s decision in part and instructed the trial court to reconsider its ruling. In February 2017, the court denied a new motion for summary judgment filed by the staffing companies and has since stated that the staffing companies would be liable to TNS for any damages owed to the class members that the staffing companies employed. However, Quanta currently believes that, due to solvency issues, any contribution from the staffing companies may not be substantial.

The final amount of liability, if any, payable in connection with this matter remains the subject of pending litigation and will ultimately depend on various factors, including the outcome of Quanta’s appeal of the trial court’s rulings on liability and damages, a final determination with respect to any attorneys’ fees or additional costs or damages owed by Quanta, and the solvency of the staffing agencies. Based on review and analysis of the trial court’s rulings on liability, Quanta does not believe, at this time, that it is probable this matter will result in a material loss. However, if Quanta is unsuccessful in this litigation and the staffing agencies are unable to fund damages owed to class members, Quanta believes the range of reasonably possible loss to Quanta upon final resolution of this matter could be up to approximately $9.5 million, plus the final amount of any attorneys’ fees and expenses awarded to the plaintiff class.

Hallen Acquisition Assumed Liability

In August 2019, in connection with the acquisition of The Hallen Construction Co., Inc. (Hallen), Quanta assumed certain contingent liabilities associated with a March 2014 natural gas-fed explosion and fire in the Manhattan borough of New York City, New York. The incident resulted in, among other things, loss of life, personal injury and the destruction of two buildings and other property damage. After investigation, the National Transportation Safety Board determined that the probable cause of the incident was the failure of certain natural gas infrastructure installed by Consolidated Edison, Inc. (Con Ed) and the failure of certain sewer infrastructure maintained by the City of New York. Pursuant to a contract with Con Ed, Hallen had performed certain work related to such natural gas infrastructure and agreed to indemnify Con Ed for certain claims, liabilities and costs associated with its work. Numerous lawsuits are pending in New York state courts related to the incident, which generally name Con Ed, the City of New York and Hallen as defendants. These lawsuits are at various preliminary stages and generally seek unspecified damages and, in some cases, punitive damages, for wrongful death, personal injury, property damage and business interruption.

As of September 30, 2021, Quanta had not recorded an accrual related to this matter. Hallen’s liabilities associated with this matter are expected to be covered under applicable insurance policies or contractual remedies negotiated by Quanta with the former owners of Hallen. If a loss becomes probable and estimable with respect to this matter, Quanta expects to accrue its estimated liability and a receivable in the same amount. However, the ultimate amount of liability in connection with this matter remains subject to uncertainties associated with pending litigation, including, among other things, the apportionment of liability among the defendants and other responsible parties and the likelihood and amount of potential damages claims. As a result, this matter could result in a loss that is in excess of, or not covered by, such insurance or contractual remedies, which could have a material adverse effect on Quanta’s consolidated financial condition, results of operations and cash flows.

Concentrations of Credit Risk

Quanta is subject to concentrations of credit risk related primarily to its cash and cash equivalents and its net receivable position with customers, which includes amounts related to billed and unbilled accounts receivable and contract assets net of advanced billings with the same customer. Substantially all of Quanta’s cash and cash equivalents are managed by what it believes to be high credit quality financial institutions. In accordance with Quanta’s investment policies, these institutions are authorized to invest cash and cash equivalents in a diversified portfolio of what Quanta believes to be high quality cash and cash equivalent investments, which consist primarily of interest-bearing demand deposits, money market investments and money market mutual funds. Although Quanta does not currently believe the principal amount of these cash and cash equivalents is subject to any material risk of loss, changes in economic conditions could impact the interest income Quanta receives from these investments. In addition, Quanta grants credit under normal payment terms, generally without collateral, to its customers, which include electric power, communications and energy companies, governmental entities, general contractors, and builders, owners and managers of commercial and industrial properties located primarily in the United States, Canada and

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Australia. While Quanta generally has certain statutory lien rights with respect to services provided, Quanta is subject to potential credit risk related to business, economic and financial market conditions that affect these customers and locations, which has been heightened as a result of the unfavorable and uncertain economic and financial market conditions resulting from the ongoing COVID-19 pandemic and the currently challenged energy market. Some of Quanta’s customers have experienced significant financial difficulties (including bankruptcy), and customers may experience financial difficulties in the future. These difficulties expose Quanta to increased risk related to collectability of billed and unbilled receivables and contract assets for services Quanta has performed.

For example, a customer within Quanta’s Underground Utility and Infrastructure Solutions segment encountered financial difficulties during 2020 that resulted in nonpayment of $27.5 million of receivables, plus accrued interest. As a result of the nonpayment, Quanta decided to foreclose the liens on the pipeline asset in order to recover the outstanding amount. During the three months ended September 30, 2021, Quanta entered into a settlement with the customer resulting in the sale of the pipeline asset to a third party and pursuant to which Quanta received $10.0 million of the amount owed and the right to receive payment of the remainder of the receivables in quarterly installments from the third party based on the cash flows generated by the pipeline and certain related assets. As a result, the remaining receivable balance of $17.5 million was reclassified to long-term receivables at September 30, 2021. Quanta also retained a security interest in the pipeline asset to secure payment of the remaining amount owed and believes that the value of the pipeline asset is in excess of such amount. However, the ultimate outcome with respect to the amount owed remains uncertain and is based on a number of assumptions that are potentially subject to change, including the future financial performance of the third party and the cash flows generated by the pipeline asset, as well as the future value of the pipeline asset. As a result, the amount ultimately collected could be materially less than the amount owed.

Additionally, in July 2021 Limetree Refining, a customer within Quanta’s Underground Utility and Infrastructure Solutions segment, filed for bankruptcy protection under Chapter 11 of the U.S. Bankruptcy Code, as amended, after experiencing operational and financial difficulties and shutting down operations at its refinery. See Note 2 for further information related to this customer.

At September 30, 2021, the net receivable position of one customer within Quanta’s Electric Power Infrastructure Solutions segment, when combined with the net receivable position of a joint venture in which such customer owns a 50% interest, represented 12% of Quanta’s consolidated net receivable position. At December 31, 2020, no customer represented 10% or more of Quanta’s consolidated net receivable position. No customer represented 10% or more of Quanta’s consolidated revenues for the three and nine months ended September 30, 2021 or 2020.

Insurance

Quanta is insured for, among other things, employer’s liability, workers’ compensation, auto liability, aviation and general liability claims. Quanta manages and maintains a portion of its casualty risk through its wholly-owned captive insurance company, which insures all claims up to the amount of the applicable deductible of its third-party insurance programs. Deductibles for the employer’s liability and workers’ compensation programs are $5.0 million per occurrence, and deductibles for the auto liability and general liability programs are $15.0 million per occurrence. Quanta also has employee health care benefit plans for most employees not subject to collective bargaining agreements, of which the primary plan is subject to a deductible of $0.8 million per claimant per year.

As of September 30, 2021 and December 31, 2020, the gross amount accrued for employer’s liability, workers’ compensation, auto liability, general liability, and group health claims totaled $316.8 million and $319.5 million, with $232.8 million and $238.0 million considered to be long-term and included in “Insurance and other non-current liabilities.” Related insurance recoveries/receivables as of September 30, 2021 and December 31, 2020 were $26.1 million and $35.6 million, of which $0.4 million and $0.4 million are included in “Prepaid expenses and other current assets” and $25.7 million and $35.2 million are included in “Other assets, net.”

Quanta renews its insurance policies on an annual basis, and therefore deductibles and levels of insurance coverage may change in future periods. In addition, insurers may cancel Quanta’s coverage or determine to exclude certain items from coverage, including wildfires, or Quanta may elect not to obtain certain types or incremental levels of insurance based on the potential benefits considered relative to the cost of such insurance, or coverage may not be available at reasonable and competitive rates. In any such event, Quanta’s overall risk exposure would increase, which could negatively affect its results of operations, financial condition and cash flows. For example, due to the increased occurrence and future risk of wildfires in California and other areas in the western United States, Australia and other locations, insurers have reduced coverage availability and increased the cost of insurance coverage for such events in recent years. As a result, Quanta’s level of insurance coverage for wildfire events has decreased, including in connection with recent annual insurance renewals, and the current level

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of coverage may not be sufficient to cover potential losses in connection with these events. Additionally, Quanta’s third-party insurers could decide to further reduce, exclude or increase the cost of coverage for wildfires or other events in connection with insurance renewals in the future.

Letters of Credit

Certain of Quanta’s vendors require letters of credit to ensure reimbursement for amounts they are disbursing on Quanta’s behalf, such as to beneficiaries under its insurance programs. In addition, from time to time, certain customers require Quanta to post letters of credit to ensure payment of subcontractors and vendors and guarantee performance under contracts. Such letters of credit are generally issued by a bank or similar financial institution, typically pursuant to Quanta’s senior credit facility. Each letter of credit commits the issuer to pay specified amounts to the holder of the letter of credit if the holder claims that Quanta has failed to perform specified actions. If this were to occur, Quanta would be required to reimburse the issuer of the letter of credit. Depending on the circumstances of such a reimbursement, Quanta may also be required to record a charge to earnings for the reimbursement.

As of September 30, 2021, Quanta had $333.9 million in outstanding letters of credit under its senior credit facility securing its casualty insurance program and various other contractual commitments. These are irrevocable stand-by letters of credit with maturities generally expiring at various times throughout 2021 and 2022. Quanta expects to renew the majority of the letters of credit related to the casualty insurance program for subsequent one-year periods upon their maturity. Quanta is not aware of any claims currently asserted or threatened under any of these letters of credit that are material, individually or in the aggregate. However, to the extent payment is required for any such claims, the amount paid could be material and could adversely affect Quanta’s consolidated business, financial condition, results of operations and cash flows.

Bonds and Parent Guarantees

Many customers, particularly in connection with new construction, require Quanta to post performance and payment bonds. These bonds provide a guarantee that Quanta will perform under the terms of a contract and pay its subcontractors and vendors. In certain circumstances, the customer may demand that the surety make payments or provide services under the bond, and Quanta must reimburse the surety for any expenses or outlays it incurs. Quanta may also be required to post letters of credit in favor of the sureties, which would reduce the borrowing availability under its senior credit facility. Quanta has not been required to make any material reimbursements to its sureties for bond-related costs except in connection with the exercise of approximately $112 million advance payment and performance bonds in 2019 related to the terminated telecommunications project in Peru, as set forth in Legal Proceedings - Peru Project Dispute above. However, to the extent further reimbursements are required, the amounts could be material and could adversely affect Quanta’s consolidated business, financial condition, results of operations and cash flows. As of September 30, 2021, Quanta is not aware of any outstanding material obligations for payments related to bond obligations.

Performance bonds expire at various times ranging from mechanical completion of a project to a period extending beyond contract completion in certain circumstances, and therefore a determination of maximum potential amounts outstanding requires certain estimates and assumptions. Such amounts can also fluctuate from period to period based upon the mix and level of Quanta’s bonded operating activity. As of September 30, 2021, the total amount of the outstanding performance bonds was estimated to be approximately $3.8 billion. Quanta’s estimated maximum exposure related to the value of the performance bonds outstanding is lowered on each bonded project as the cost to complete is reduced, and each commitment under a performance bond generally extinguishes concurrently with the expiration of its related contractual obligation. The estimated cost to complete these bonded projects was approximately $1.1 billion as of September 30, 2021.

Additionally, from time to time, Quanta guarantees certain obligations and liabilities of its subsidiaries that may arise in connection with, among other things, contracts with customers, equipment lease obligations, joint venture arrangements and contractor licenses. These guarantees may cover all of the subsidiary’s unperformed, undischarged and unreleased obligations and liabilities under or in connection with the relevant agreement. For example, with respect to customer contracts, a guarantee may cover a variety of obligations and liabilities arising during the ordinary course of the subsidiary’s business or operations, including, among other things, warranty and breach of contract claims, third party and environmental liabilities arising from the subsidiary’s work and for which it is responsible, liquidated damages, or indemnity claims. Quanta is not aware of any claims under any guarantees that are material, except as set forth in Legal Proceedings – Maurepas Project Dispute above. To the extent a subsidiary incurs a material obligation or liability and Quanta has guaranteed the performance or payment of such obligation or liability, the recovery by a customer or other counterparty or a third party will not be limited to the assets of the subsidiary. As a result, responsibility under the guarantee could exceed the amount recoverable from the subsidiary alone and could materially and adversely affect Quanta’s consolidated business, financial condition, results of operations and cash flows.

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Collective Bargaining Agreements and Multiemployer Pension Plans

Certain of Quanta’s operating units are parties to collective bargaining agreements with unions that represent certain of their employees. The collective bargaining agreements expire at various times and have typically been renegotiated and renewed on terms similar to those in the expiring agreements. From time to time, Quanta is a party to grievance and arbitration actions based on claims arising out of the collective bargaining agreements. The agreements require the operating units to pay specified wages, provide certain benefits to union employees and contribute certain amounts to multiemployer pension plans and employee benefit trusts. Quanta’s multiemployer pension plan contribution rates generally are made to the plans on a “pay-as-you-go” basis based on its union employee payrolls. The location and number of union employees that Quanta employs at any given time and the plans in which they may participate vary depending on Quanta’s need for union resources in connection with its ongoing projects. Therefore, Quanta is unable to accurately predict its union employee payroll and the resulting multiemployer pension plan contribution obligations for future periods.

The Pension Protection Act of 2006 may require Quanta to make additional contributions to its multiemployer pension plans if they become underfunded, and these additional contributions will be determined based on Quanta’s union employee payrolls. Certain plans to which Quanta contributes or may contribute in the future may adopt measures to improve their funded status through a funding improvement or rehabilitation plan, as applicable, which may require additional contributions from employers (e.g., a surcharge on benefit contributions) and/or modifications to retiree benefits. The amount, if any, that Quanta may be obligated to contribute to these plans cannot be reasonably estimated due to uncertainty regarding the amount of future work involving covered union employees, future contribution levels and possible surcharges on plan contributions.

Quanta may be subject to additional liabilities imposed by law as a result of its participation in multiemployer defined benefit pension plans. These liabilities may include an allocable share of the unfunded vested benefits in the plan for all plan participants, not only the benefits payable to a contributing employer’s own retirees. As a result, participating employers may bear a higher proportion of liability for unfunded vested benefits if other participating employers cease to contribute or withdraw, with the reallocation of liability being more acute in cases when a withdrawn employer is insolvent or otherwise fails to pay its withdrawal liability. Quanta is not aware of any material withdrawal liabilities that have been incurred or asserted and that remain outstanding as a result of a withdrawal by Quanta from a multiemployer defined benefit pension plan. However, Quanta’s future contribution obligations and potential withdrawal liability exposure could vary based on the investment and actuarial performance of the multiemployer pension plans to which it contributes and other factors, which could be negatively impacted as a result of the unfavorable and uncertain economic and financial market conditions resulting from the ongoing COVID-19 pandemic and related issues. Quanta has been subject to significant withdrawal liabilities in the past, including in connection with its withdrawal from the Central States, Southeast and Southwest Areas Pension Plan. To the extent Quanta is subject to material withdrawal liabilities in the future, such liability could adversely affect its business, financial condition, results of operations and cash flows.

Deferred Compensation Plans

Quanta made matching contributions to the eligible participants’ accounts under deferred compensation plans of $0.2 million during each the three months ended September 30, 2021 and 2020. Quanta made matching contributions to the eligible participants’ accounts under the deferred compensation plans of $1.0 million during each the nine months ended September 30, 2021 and 2020. Quanta made no discretionary contributions during the nine months ended September 30, 2021 and 2020. At September 30, 2021 and December 31, 2020, obligations under these plans, including amounts contributed by Quanta, were $69.1 million and $58.2 million, the majority of which were included in “Insurance and other non-current liabilities” in the accompanying condensed consolidated balance sheets. Quanta maintains investments to contribute to future obligations related to these deferred compensation plans. At September 30, 2021 and December 31, 2020, these investments were primarily comprised of company-owned life insurance policies, had fair market values of $68.4 million and $56.5 million and were included in “Other assets, net” in the accompanying condensed consolidated balance sheets.

During the three months ended September 30, 2021 and 2020, the fair market value of assets associated with our deferred compensation plan decreased $0.2 million and increased $2.8 million. During the nine months ended September 30, 2021 and 2020, the fair market value of assets associated with our deferred compensation plan increased $5.3 million and $1.9 million. These changes in fair market value of the assets are recorded in “Other income (expense), net” and were largely offset by corresponding changes in the fair market value of the liabilities associated with our deferred compensation plan, which are recorded in “Selling, general and administrative expenses.” During the three months ended September 30, 2021 and 2020, the fair market value of deferred compensation liabilities did not change and increased $3.3 million. During the nine months ended September 30, 2021 and 2020, the fair market value of deferred compensation liabilities increased $6.0 million and $1.9 million.

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Indemnities

Quanta generally indemnifies its customers for the services it provides under its contracts and other specified liabilities, which may subject Quanta to indemnity claims and liabilities and related litigation. Additionally, in connection with certain acquisitions and dispositions, Quanta has indemnified various parties against specified liabilities that those parties might incur in the future. The indemnities under acquisition or disposition agreements are usually contingent upon the other party incurring liabilities that reach specified thresholds. Quanta is not aware of any indemnity claims in connection with its indemnity obligations that are material. However, to the extent indemnification is required, the amount could adversely affect Quanta’s consolidated business, financial condition, results of operations and cash flows.

In the normal course of Quanta’s acquisition transactions, Quanta obtains rights to indemnification from the sellers or former owners of acquired businesses for certain risks, liabilities and obligations arising from their operations prior to the date of acquisition, such as performance, operational, safety, workforce or tax issues, some of which Quanta may not have discovered during due diligence. However, the indemnities may not cover all of Quanta’s exposure for such pre-acquisition matters, or the indemnitors may be unwilling or unable to pay amounts owed to Quanta. Accordingly, Quanta may incur expenses for which it is not reimbursed, and such amounts could be material and could have a material adverse effect on Quanta’s business or consolidated financial condition, results of operations and cash flows. For example, Quanta has obtained certain indemnification rights from the former owners of Hallen with respect to contingent liabilities that were assumed in connection with the acquisition, as set forth in Legal Proceedings — Hallen Acquisition Assumed Liability above.

Residual Value Guarantees

Quanta has also guaranteed the residual value under certain of its equipment operating leases, agreeing to pay any difference between this residual value and the fair market value of the underlying asset at the date of lease termination. As of September 30, 2021, the maximum guaranteed residual value of this equipment was $886.9 million. While Quanta believes that no significant payments will be made as a result of these residual value guarantees, there can be no assurance that significant payments will not be required in the future.

Deferral of Employer Payroll Taxes

During 2020, the U.S. federal government enacted the Coronavirus Aid, Relief, and Economic Security Act (the CARES Act), which provided for various tax relief and tax incentive measures. These measures did not have a material impact on Quanta’s results of operations. However, pursuant to the CARES Act, Quanta deferred the payment of $108.9 million of employer payroll taxes during the year ended December 31, 2020, 50% of which are due to be paid by December 31, 2021 and the remainder is due by December 31, 2022.

11. SEGMENT INFORMATION:

Quanta currently presents its operations under two reportable segments: (1) Electric Power Infrastructure Solutions and (2) Underground Utility and Infrastructure Solutions. This structure is generally based on the broad end-user markets for Quanta’s services. See Note 1 for additional information regarding Quanta’s reportable segments.

Quanta’s segment results are derived from the types of services provided across its operating units in each of its end user markets. Quanta’s entrepreneurial business model allows multiple operating units to serve the same or similar customers and to provide a range of services across end user markets. Quanta’s operating units are organized into one of two internal divisions: the Electric Power Infrastructure Solutions Division and the Underground Utility and Infrastructure Solutions Division. These internal divisions are closely aligned with the reportable segments, and operating units are assigned to divisions based on the predominant type of work performed.

Reportable segment information, including revenues and operating income by type of work, is gathered from each operating unit for the purpose of evaluating segment performance in support of Quanta’s market strategies. Classification of operating unit revenues by type of work for segment reporting purposes can require judgment on the part of management. Quanta’s operating units may perform joint projects for customers in multiple industries, deliver multiple types of services under a single customer contract or provide service offerings to various industries. For example, Quanta performs joint trenching projects to install distribution lines for electric power and natural gas customers.

In addition, Quanta’s integrated operations and common administrative support for its operating units require that certain allocations be made to determine segment profitability, including allocations of shared and indirect costs (e.g., facility costs), indirect operating expenses (e.g., depreciation), and general and administrative costs. Certain corporate costs are not allocated

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QUANTA SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

(Unaudited)

and include payroll and benefits, employee travel expenses, facility costs, professional fees, acquisition costs and amortization related to intangible assets.

Summarized financial information for Quanta’s reportable segments is presented in the following table (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Revenues:
Electric Power Infrastructure Solutions	$	2,328,468	$	2,107,621	$	6,536,363	$	5,667,566
Underground Utility and Infrastructure Solutions	1,024,810		912,540		2,520,312		2,622,921
Consolidated revenues	$	3,353,278	$	3,020,161	$	9,056,675	$	8,290,487
Operating income (loss):
Electric Power Infrastructure Solutions (1)(2)	$	288,283	$	268,376	$	724,217	$	581,030
Underground Utility and Infrastructure Solutions	68,167		76,220		100,917		128,747
Corporate and Non-Allocated Costs	(108,373)		(102,381)		(301,677)		(273,909)
Consolidated operating income	$	248,077	$	242,215	$	523,457	$	435,868
Depreciation:
Electric Power Infrastructure Solutions	$	37,196	$	30,637	$	110,925	$	88,337
Underground Utility and Infrastructure Solutions	20,958		21,313		63,183		64,280
Corporate and Non-Allocated Costs	3,462		4,294		12,372		12,563
Consolidated depreciation	$	61,616	$	56,244	$	186,480	$	165,180

(1)    As of December 31, 2020, Quanta had substantially completed the exit of its operations in Latin America. For the three and nine months ended September 30, 2020, operating income for the Electric Power Infrastructure Solutions segment included $15.4 million and $46.9 million of operating losses related to Latin American operations.

(2)    Operating income for the Electric Power Infrastructure Solutions segment includes equity in earnings of integral unconsolidated affiliates that are operationally integral to the operations of Quanta, which primarily consists of equity in earnings related to Quanta’s equity interest in LUMA.

Separate measures of Quanta’s assets and cash flows by reportable segment, including capital expenditures, are not produced or utilized by management to evaluate segment performance. Quanta’s fixed assets, which are held at the operating unit level, include operating machinery, equipment and vehicles, office equipment, buildings and leasehold improvements, and certain units are used on an interchangeable basis across its reportable segments. As such, for reporting purposes, total depreciation expense is allocated each quarter among Quanta’s reportable segments based on the ratio of each reportable segment’s revenue contribution to consolidated revenues.

Foreign Operations

During the three months ended September 30, 2021 and 2020, Quanta derived $460.8 million and $390.6 million of its revenues from foreign operations. During the nine months ended September 30, 2021 and 2020, Quanta derived $1.39 billion and $1.18 billion of its revenues from foreign operations. Of Quanta’s foreign revenues, 83% and 82% were earned in Canada during the three months ended September 30, 2021 and 2020 and 81% and 77% were earned in Canada during the nine months ended September 30, 2021 and 2020. In addition, Quanta held property and equipment of $317.6 million and $336.4 million in foreign countries, primarily Canada, as of September 30, 2021 and December 31, 2020.

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QUANTA SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

(Unaudited)

12. SUPPLEMENTAL CASH FLOW INFORMATION:

The net effects of changes in operating assets and liabilities, net of non-cash transactions, on cash flows from operating activities are as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Accounts and notes receivable	$	(411,890)	$	(322,579)	$	(299,857)	$	37,541
Contract assets	(96,423)		21,950		(308,849)		121,999
Inventories	5		8,655		(6,139)		6,787
Prepaid expenses and other current assets	37,406		19,655		(4,943)		70,133
Accounts payable and accrued expenses and other non-current liabilities	230,631		235,633		289,833		147,888
Contract liabilities	(1,397)		(79,964)		(27,027)		(73,567)
Other, net	(6,027)		(7,813)		(15,205)		(20,066)
Net change in operating assets and liabilities, net of non-cash transactions	$	(247,695)	$	(124,463)	$	(372,187)	$	290,715

Reconciliations of cash, cash equivalents, and restricted cash reported within the condensed consolidated balance sheets that sum to the total of such amounts shown in the statements of cash flows are as follows (in thousands):

	September 30,
	2021		2020
Cash and cash equivalents	$	1,696,210	$	216,935
Restricted cash included in “Prepaid expenses and other current assets”	2,108		1,252
Restricted cash included in “Other assets, net”	778		915
Total cash, cash equivalents, and restricted cash reported in the statements of cash flows	$	1,699,096	$	219,102

	June 30,
	2021		2020
Cash and cash equivalents	$	212,473	$	530,670
Restricted cash included in “Prepaid expenses and other current assets”	1,460		1,266
Restricted cash included in “Other assets, net”	782		917
Total cash, cash equivalents, and restricted cash reported in the statements of cash flows	$	214,715	$	532,853

	December 31,
	2020		2019
Cash and cash equivalents	$	184,620	$	164,798
Restricted cash included in “Prepaid expenses and other current assets”	1,275		4,026
Restricted cash included in “Other assets, net”	913		921
Total cash, cash equivalents, and restricted cash reported in the statements of cash flows	$	186,808	$	169,745

Restricted cash includes any cash that is legally restricted as to withdrawal or usage.

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QUANTA SERVICES, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

(Unaudited)

Supplemental cash flow information related to leases and rental purchase options is as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	(25,331)	$	(29,333)	$	(79,730)	$	(88,570)
Operating cash flows from finance leases	$	(18)	$	(16)	$	(68)	$	(50)
Financing cash flows from finance leases	$	(168)	$	(102)	$	(688)	$	(525)
Lease assets obtained in exchange for lease liabilities:
Operating leases	$	17,081	$	16,619	$	41,686	$	56,970
Finance leases	$	112	$	275	$	398	$	1,158
Rental purchase option assets obtained in exchange for rental purchase option liabilities	$	1,129	$	3,306	$	7,009	$	13,229

Additional supplemental cash flow information is as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Cash (paid) received during the period for —
Interest paid	$	(2,260)	$	(8,443)	$	(26,883)	$	(30,704)
Income taxes paid	$	(35,740)	$	(86,077)	$	(103,225)	$	(149,690)
Income tax refunds	$	2,419	$	1,087	$	9,211	$	5,545

During the nine months ended September 30, 2020, in connection with the disposition of a small business, Quanta recorded a note receivable in exchange for the transfer of $8.5 million of inventory.

13. SUBSEQUENT EVENTS:

On October 13, 2021, Quanta completed the acquisition of Blattner, a large utility-scale renewable energy infrastructure solutions provider located in North America. The consideration for this transaction, which remains subject to certain post-closing adjustments, consisted of approximately $2.29 billion paid in cash on the date of acquisition and 3.3 million shares of Quanta common stock, which had a fair value of $345.4 million as of the date of the acquisition. See Note 1 and Note 4 for additional information on Blattner and Quanta’s acquisition of Blattner. Additionally, on October 8, 2021, Quanta amended its senior credit facility to, among other things, provide for a new $750.0 million term loan facility, increase the aggregate revolving commitments from $2.51 billion to $2.64 billion and extend the maturity date for the revolving commitments from September 2025 to October 2026. Quanta used proceeds from the new term loan, together with the net proceeds from its offering of senior notes in September 2021 and revolving loans borrowed under the senior credit facility, to finance the cash portion of the consideration paid in connection with the acquisition of Blattner. See Note 6 for additional information regarding the amendment to Quanta’s senior credit facility.

In October 2021, Quanta also acquired (i) a 44% interest in an entity that will be accounted for as an integral affiliate using the equity method of accounting and (ii) a business located in the United States that provides electric power construction and related services. See Note 2 and Note 4 for additional information on this investment and acquisition.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion and analysis of the financial condition and results of operations of Quanta Services, Inc. (together with its subsidiaries, Quanta, we, us or our) should be read in conjunction with our condensed consolidated financial statements and related notes included elsewhere in this Quarterly Report and with our 2020 Annual Report, which was filed with the SEC on March 1, 2021 and is available on the SEC’s website at www.sec.gov and on our website at www.quantaservices.com. The discussion below contains forward-looking statements that are based upon our current expectations and are subject to uncertainty and changes in circumstances. Actual results may differ materially from these expectations due to inaccurate assumptions and known or unknown risks and uncertainties, including those identified in Cautionary Statement About Forward-Looking Statements and Information above, in Item 1A. Risk Factors of Part II of this Quarterly Report and in Item 1A. Risk Factors of Part I of our 2020 Annual Report.

Overview

We are a leading provider of specialty contracting services, delivering comprehensive infrastructure solutions for the electric and gas utility, renewable energy, communications, pipeline and energy industries in the United States, Canada, Australia and select other international markets. The performance of our business generally depends on our ability to obtain contracts with customers and to effectively deliver the services provided under those contracts. The services we provide include the design, engineering, new construction, upgrade and repair and maintenance of infrastructure within each of the industries we serve, such as electric power transmission and distribution networks; substation facilities; wind and solar energy generation and battery storage facilities; communications and cable multi-system operator networks; gas utility systems; and pipeline transmission systems and facilities. Our customers include many of the leading companies in the industries we serve, and we endeavor to develop and maintain strategic alliances and preferred service provider status with our customers. Our services are typically provided pursuant to master service agreements, repair and maintenance contracts and fixed price and non-fixed price new construction contracts.

We report our results under two reportable segments: (1) Electric Power Infrastructure Solutions and (2) Underground Utility and Infrastructure Solutions. This structure is generally focused on broad end-user markets for our services. Included within the Electric Power Infrastructure Solutions segment are the results related to our communications infrastructure services.

Current Quarter Financial Results and Significant Operational Trends and Events

Key financial results for the three months ended September 30, 2021 included:

•Consolidated revenues increased 11.0%, or $333.1 million, to $3.35 billion as compared to consolidated revenues of $3.02 billion for the three months ended September 30, 2020;

•Operating income increased 2.4%, or $5.9 million, to $248.1 million as compared to $242.2 million for the three months ended September 30, 2020;

•Net income attributable to common stock increased 7.0%, or $11.5 million, to $174.4 million as compared to $162.9 million for the three months ended September 30, 2020;

•Diluted earnings per share increased 7.1%, or $0.08, to $1.21 as compared to $1.13 for the three months ended September 30, 2020;

•EBITDA (a non-GAAP financial measure) increased 5.8%, or $18.8 million, to $340.3 million, as compared to $321.6 million for the three months ended September 30, 2020, and adjusted EBITDA (a non-GAAP financial measure) increased 3.8%, or $13.6 million, to $366.9 million, as compared to $353.3 million for the three months ended September 30, 2020;

•Net cash provided by operating activities decreased by $97.0 million to $17.9 million, as compared to net cash provided by operating activities of $114.9 million for the three months ended September 30, 2020;

•Remaining performance obligations increased 9.6%, or $382.9 million, to $4.37 billion as of September 30, 2021 as compared to $3.99 billion as of December 31, 2020; and

•Total backlog (a non-GAAP financial measure) increased 12.5%, or $1.89 billion, to $17.02 billion as of September 30, 2021, as compared to $15.13 billion as of December 31, 2020.

For a reconciliation of EBITDA and adjusted EBITDA to net income attributable to common stock, the most comparable GAAP financial measure, and a reconciliation of backlog to remaining performance obligations, the most comparable GAAP financial measure, see Non-GAAP Financial Measures below.

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As described below, during the three months ended September 30, 2021, our results reflected certain significant operational trends and events as compared to the three months ended September 30, 2020.

Electric Power Infrastructure Solutions Segment

•Revenues increased by 10.5% to $2.33 billion, as compared to $2.11 billion.

•Operating income increased by 7.4% to $288.3 million, as compared to $268.4 million, and operating income as a percentage of revenues decreased to 12.4%, as compared to 12.7%.

•Revenues increased primarily due to continued favorable dynamics across our core utility market and increased demand for our electric power services, as well as approximately $55 million of revenues from acquired businesses, $27 million in incremental emergency restoration services revenues and a $15 million positive impact related to more favorable foreign currency exchange rates, primarily the Canadian dollar and U.S. dollar exchange rate.

•Operating income increased primarily due to increased revenues and operating income as a percentage of revenues decreased due to normal project variability and higher general and administrative expenses during the three months ended September 30, 2021 as compared to lower than normal levels for the three months ended September 30, 2020.

Underground Utility and Infrastructure Solutions Segment

•Revenues increased by 12.3% to $1.02 billion, as compared to $912.5 million.

•Operating income decreased by 10.6% to $68.2 million, as compared to $76.2 million, and operating income as a percentage of revenues decreased to 6.7%, as compared to 8.4%.

•Revenues increased primarily due to increased revenues from gas distribution and industrial services and a $10 million increase in revenues attributable to acquired businesses.

•Operating income and operating income as a percentage of revenues decreased in the three months ended September 30, 2021 primarily due to adjustments on certain large pipeline projects that favorably impacted the three months ended September 30, 2020, which were associated with the recognition of previously deferred milestone payments and reduced contingencies due to a reduction in the scope of work on a project that is now complete, as well as the completion of certain other projects earlier than anticipated.

See Business Environment, Results of Operations and Liquidity and Capital Resources below for additional information and discussion related to consolidated and segment results.

Recent Significant Acquisition

On October 13, 2021, we completed the acquisition of Blattner, a large utility-scale renewable energy infrastructure solutions provider that is located in and primarily operates in North America. Consideration for this transaction consisted of approximately $2.29 billion paid in cash on the date of acquisition and 3.3 million shares of Quanta common stock, which had a fair value of $345.4 million as of the date of the acquisition. The final amount of consideration for this acquisition remains subject to certain post-closing adjustments, including with respect to net working capital. Additionally, pursuant to the terms of the agreement and plan of merger, the former Blattner owners are eligible for the potential payment of up to $300 million of contingent consideration, payable to the extent the acquired business achieves certain financial performance targets over a three-year period beginning in January 2022. Blattner’s results will be included in our consolidated financial statements beginning on the acquisition date. We are in the process of performing procedures to determine the fair value of assets acquired and liabilities assumed related to the acquisition of Blattner, including the fair value assessment of contingent consideration, and will include the preliminary purchase price allocation in our Annual Report on Form 10-K for the year ended December 31, 2021.

Business Environment

We believe there are long-term growth opportunities across our industries, and we continue to have a positive long-term outlook. Although not without risks and challenges, including those discussed in Cautionary Statement About Forward-Looking Statements and Information, Item 1A. Risk Factors of Part II of this Quarterly Report and Item 1A. Risk Factors of Part I of our 2020 Annual Report, we believe, with our full-service operations, broad geographic reach, financial position and technical expertise, we are well positioned to capitalize on opportunities and trends in our industries.

Electric Power Infrastructure Solutions. Utilities are investing significant capital in their electric power delivery systems, particularly transmission, substation and distribution infrastructure, through multi-year, multi-billion dollar grid modernization and reliability programs, which have provided, and are expected to continue to provide, demand for our services. As the overall

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electrification trends in North America support a transition toward a carbon-neutral economy, utilities are accommodating a changing fuel generation mix that is moving toward more sustainable sources such as renewables (e.g., wind, solar and battery storage) and natural gas and replacing aging infrastructure to support long-term economic growth. We believe this trend will generate significant demand in the near- and longer-term for our services, including the development and construction of generation facilities powered by renewable energy sources (e.g., wind and solar) and certain traditional energy sources (e.g., natural gas), the development and construction of related infrastructure (e.g., battery storage), and the modernization of existing assets. While the demand for certain renewable energy services is expected to fluctuate in the short term due to, among other things, supply chain and other logistical difficulties that could delay projects, production tax credits and sourcing restrictions on materials necessary for certain projects (e.g., solar panels), we believe our recent acquisition of Blattner, together with the renewable energy and related services performed by our other operating companies, positions us to capitalize on the longer term growth trends with respect to the development of wind, solar and storage capacity infrastructure.

Furthermore, while the COVID-19 pandemic resulted in a short-term overall decline in electricity usage in 2020, primarily related to commercial and industrial users, demand has recovered and continues to increase in 2021, and we expect demand for electricity in North America to grow over the long term and believe that certain segments of the North American electric power grid are not adequate to efficiently serve the power needs of the future. To the extent that electrification trends increase, including through electric vehicle (EV) adoption, demand for electricity could be greater than currently anticipated. To accommodate this growth, we expect continued demand for new or expanded transmission and substation infrastructure to reliably transport power and interconnect new generation facilities and the modification and reengineering of existing infrastructure as existing coal and nuclear generation facilities are retired or shut down.

In order to reliably and efficiently deliver power, and in response to federal reliability standards, utilities are also integrating smart grid technologies into distribution systems in order to improve grid management and create efficiencies, and in preparation for emerging technologies such as EVs. A number of utilities have and continue to implement system upgrades or hardening programs in response to recurring severe weather events, such as hurricanes and wildfires, and, in particular, there are significant system resiliency initiatives in California and other regions in the western U.S. underway that are designed to prevent and manage the impact of wildfires. These resiliency initiatives provide additional opportunities for our services; however, they also increase our potential exposure to significant liabilities attributable to those events. Utilities are also executing significant initiatives to underground critical infrastructure, including additional underground transmission and distribution initiatives by utilities in California, underground electric transmission projects in the northeast, underground distribution circuits along the coastlines and underground transmission lines for offshore wind generation projects.

With respect to our communications service offerings, consumer and commercial demand for communication and data-intensive, high-bandwidth wireline and wireless services and applications is driving significant investment in infrastructure and the deployment of new technologies. In particular, communications providers in North America are in the early stages of developing new fifth generation wireless services (5G), which are intended to facilitate bandwidth-intensive services at high speeds for consumers and commercial applications. Additionally, the Federal Communications Commission has enacted the Rural Digital Opportunity Fund for the purpose of deploying billions of dollars in federal funds for high speed fixed broadband service to underserved rural homes and small businesses. As a result of these industry trends, we believe there will be meaningful demand for our engineering and construction services. We also reoriented our communications service offerings to strategically focus on the North American market, substantially completing the exit of our Latin American communications operations during 2020, which we anticipate will result in improved profitability within our communications services operations.

Underground Utility and Infrastructure Solutions. For several years we have focused on increasing our underground utility and infrastructure solutions related to specialty services and industries that we believe are driven by regulated utility spending, regulation, replacement and rehabilitation of aging infrastructure and safety and environmental initiatives, which we believe provide a greater level of business sustainability and predictability. These service offerings include gas utility services, pipeline integrity services and downstream industrial services. We believe focusing on these services helps to offset the seasonality and cyclicality of our larger pipeline project business, and although our strategic focus on larger pipeline projects has decreased, we continue to pursue project opportunities to the extent they satisfy our margin and risk profiles and support the needs of our customers. Though we experienced short-term disruptions in 2020 and to a lesser extent to date in 2021 due to the COVID-19 pandemic, we believe demand for our gas utility distribution services will increase as a result of customer desire to upgrade and replace aging infrastructure and increasing regulatory requirements. In particular, natural gas utilities have implemented multi-decade modernization programs to replace aging cast iron, bare steel, gas and plastic system infrastructure with modern materials for safety, reliability and environmental purposes.

We believe there are also growth opportunities for our pipeline integrity, rehabilitation and replacement services, as regulatory measures have increased the frequency and stringency of pipeline integrity testing requirements that require our customers to test, inspect, repair, maintain and replace pipeline infrastructure to ensure that it operates in a safe, reliable and environmentally conscious manner. Further, permitting challenges associated with construction of new pipelines can make

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existing pipeline infrastructure more valuable, motivating owners to extend the useful life of existing pipeline assets through integrity initiatives.

Broader challenges in the energy market, which have been compounded by the COVID-19 pandemic, have materially impacted, and are expected to continue to materially impact, our Underground Utility and Infrastructure Solutions segment. In particular, demand for our midstream and industrial services operations has declined as customers reduced and deferred regularly scheduled maintenance and capital projects due to lack of demand for refined products. Our services to downstream industrial energy customers, which are primarily located along the Gulf Coast of the United States and in other select markets in North America, have been negatively impacted by the challenging overall energy market conditions that resulted in an overall decline in global demand for refined products during 2020 and 2021. While demand for our critical path catalyst services has remained solid, in the second half of 2020 customers began reducing onsite activity for our other services and have deferred maintenance and certain turnaround projects to late 2021 and 2022. Despite the current market conditions, we believe there are significant long-term opportunities for these services, including our high-pressure and critical-path turnaround services, as well as our capabilities with respect to instrumentation and electrical services, piping, fabrication and storage tanks services, and other industrial services, and that processing facilities located along the U.S. Gulf Coast region should have certain long-term strategic advantages due to their proximity to affordable hydrocarbon resources. However, these processing facilities can also be negatively impacted for short-term periods due to severe weather events, such as hurricanes, tropical storms and floods.

Furthermore, the broader oil and gas industry is highly cyclical and subject to price and production volume volatility, which can impact demand for our services. For example, certain of our end markets where the price of oil is influential, such as Australia, the Canadian Oil Sands and certain oil-driven U.S. shale formations, have been materially impacted by challenged energy market conditions. We have also entered the late-stage of the current construction cycle of larger pipeline projects, while the anticipated next cycle of larger projects could be impacted by various factors, including, among other things, permitting delays and worksite access limitations related to environmental regulations. As a result of these dynamics, our revenues related to larger pipeline projects have declined significantly over the last few years. This dynamic is supportive of our increased focus on specialty services and industries that are driven by regulated utility spending, regulation, replacement and rehabilitation of aging infrastructure and safety and environmental initiatives, which we believe provide a greater level of business sustainability and predictability.

Lastly, we believe there are also longer-term opportunities that may arise in this segment. For example, we believe natural gas, due to its expected abundant supply and attractive price over the long-term, will remain a fuel of choice for both primary power generation and backup power generation for renewable power plants in North America, which we believe could position North America as a leading competitor in the global LNG export market. In certain areas, the existing pipeline system infrastructure is insufficient to support any future LNG export facilities, which could provide additional opportunities for our business. We also believe that customers in this segment may implement strategies to reduce carbon emissions produced from their operations, which could provide incremental opportunities for our services, including developing infrastructure for blending hydrogen into natural gas flow to customers, further investment in renewable energy generation opportunities and carbon capture projects that could include building or repurposing pipeline infrastructure. While certain customers are in various stages of evaluating these types of strategies, we expect that any meaningful opportunities would only arise in the longer term.

COVID-19 Pandemic and Related Economic Impact. The effects of the COVID-19 pandemic continue to significantly impact global economies due to, among other things, workforce and travel restrictions and supply chain, production and other logistical disruptions. While we have continued to operate substantially all of our activities as a provider of essential services, during the course of the pandemic our operations and financial results have been adversely impacted by reduced customer spending and demand for certain of our services (including as described above), as well as governmental responses to the COVID-19 pandemic, including shut-down orders and limitations on work site practices implemented by governments, which have negatively impacted (i) our Canadian operations and financial results during 2020 and to date in 2021; (ii) our Australian operations and financial results during 2020 and to date in 2021; (iii) our operations in certain major U.S. metropolitan markets that were meaningfully impacted by the pandemic during the first and second quarters of 2020; and (iv) our Latin American operations during 2020.

Additionally, vaccination and testing requirements related to COVID-19 could impact our business in the future. In September 2021, the Occupational Safety and Health Administration was directed to implement an emergency temporary standard requiring employers with 100 or more employees to ensure their workforce is fully vaccinated or to require unvaccinated workers to produce a negative COVID-19 test result on at least a weekly basis. This standard has been issued and is expected to be published on November 5, 2021 and fully applicable by January 2022. The standard will apply to us and the costs related to mandatory testing could represent a substantial expense to us. Additionally, in September 2021, President Biden issued an executive order that requires federal contractors and subcontractors to mandate their employees be fully vaccinated against COVID-19 by January 2022. Some of our operating companies, as well as many of our customers, are considered federal contractors, or are performing work under contracts covered by the executive order. As such, employees of those

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operating companies may need to be fully vaccinated to perform related work. In addition, many of our customers have established, or we believe are in the process of establishing, vaccination requirements that would apply to our employees performing work on their premises, or in proximity of their employees. The implementation of these vaccination and testing requirements could have a material adverse effect on our business, financial condition, results of operations or cash flows in the event that, among other things, a significant portion of our workforce does not choose to become vaccinated, the costs related to mandatory testing for unvaccinated employees are significant, the time away from work for testing is disruptive to our operations, or our unvaccinated employees are unable to perform work for customers that require vaccination.

We also continue to monitor supply chain and other logistical challenges with respect to certain materials and equipment necessary for the performance of our business, including, among other things, availability and costs related to steel, materials for renewable energy projects, new vehicles for our fleet (both on-road and specialty vehicles) and vehicle parts (e.g., tires). For example, we believe some participants in the renewable energy market are experiencing supply chain challenges, resulting in delays and shortages of materials necessary for the construction of renewable projects in the near term. While we believe many of our renewable energy customers are generally better equipped to manage near-term supply chain disruptions than smaller competitors, these challenges could impact our ability to perform renewable services during this period. Additionally, based on, among other things, the significant worldwide shortage of semiconductors, vehicle manufacturers are experiencing production delays with respect to vehicles we utilize in our operations. While we believe we have taken steps to secure delivery of such vehicles in the near term and do not anticipate any significant disruptions with respect to our fleet, to the extent the production issues become worse than expected or become longer-term in nature, our operations could be negatively impacted.

The broader and longer-term implications of the COVID-19 pandemic on our results of operations and overall financial performance and position remain highly uncertain and variable, and we expect continued operational challenges in the remainder of 2021 and into 2022 for portions of our operations. The future impact that the pandemic, or any resulting market disruption and volatility, will have on our business, cash flows, liquidity, financial condition and results of operations will depend on future developments, including, among others, the duration and severity of the pandemic; the actions taken by governmental authorities, customers, suppliers and other third parties in response to the pandemic and the consequences of those actions; our workforce availability; and the timing and extent to which normal economic and operating conditions resume and continue.

Regulatory Challenges and Opportunities. The regulatory environment creates both challenges and opportunities for our business, and in recent years electric power infrastructure solutions and underground utility and infrastructure solutions margins have been impacted by regulatory and permitting delays in certain periods, particularly with respect to larger electric transmission and larger pipeline projects. Regulatory and environmental permitting processes continue to create uncertainty for projects and negatively impact customer spending, and delays have increased as the COVID-19 pandemic has impacted regulatory agency operations. For example, recent changes to the U.S. Army Corps of Engineers Clean Water Act Section 404 Nationwide Permit 12 and related executive orders have impacted certain projects and resulted in increased costs and project interruptions and delays as customers are increasingly forced to seek additional or revised individual permits from the U.S. Army Corps of Engineers.

However, we believe that there are also several existing, pending or proposed legislative or regulatory actions that may alleviate certain regulatory and permitting issues and positively impact long-term demand, particularly in connection with electric power infrastructure and renewable energy spending. For example, regulatory changes affecting siting and right-of-way processes could potentially accelerate construction for transmission projects, and state and federal reliability standards are creating incentives for system investment and maintenance. Additionally, as described above, we consider renewable energy, including solar and wind generation facilities, to be an ongoing opportunity; however, policy and economic incentives designed to support and encourage such projects can create variability of project timing.

Labor Resource Availability and Cost. We continue to address the longer-term need for additional labor resources in our markets, as our customers continue to seek additional specialized labor resources to address an aging utility workforce and longer-term labor availability issues, increasing pressure to reduce costs and improve reliability, and increasing duration and complexity of their capital programs. We believe these trends will continue, possibly to such a degree that demand for labor resources will outpace supply. Furthermore, the increased demand for our services based on the dynamics described above can create shortages of qualified labor in our markets. Our ability to capitalize on available opportunities is limited by our ability to employ, train and retain the necessary skilled personnel, and therefore we are taking proactive steps to develop our workforce, including through strategic relationships with universities, the military and unions and the expansion and development of our training facility and postsecondary educational institution. Although we believe these initiatives will help address workforce needs, meeting our customers’ demand for labor resources could remain challenging.

Additionally, we continue to monitor our labor markets and expect labor costs to increase based on increased demand for our services and, to a lesser extent, the recent escalated inflationary environment in the United States. Our labor costs are passed through in certain of our contracts, and the portion of our workforce that is represented by labor unions typically operate under

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multi-year collective bargaining agreements, which provide some visibility into future labor costs. While we do not currently believe this environment will present a material risk to our profitability and would expect to be able to adjust contract pricing with certain customers to the extent wages and other labor costs increase, whether due to renegotiation of collective bargaining agreements or market conditions, meaningful increases in our labor costs could have a material adverse effect on our business, financial condition, results of operations or cash flows to the extent we cannot do so.

Acquisitions and Investments. We believe potential acquisition and investment opportunities exist in our industries and adjacent industries, primarily due to the highly fragmented and evolving nature of those industries and inability of many companies to expand due to capital or liquidity constraints. We continue to evaluate opportunities that are expected to, among other things, broaden our customer base, expand our geographic area of operations and grow and diversify our portfolio of services.

Significant Factors Impacting Results

Our revenues, margins and other results of operations can be influenced by a variety of factors in any given period, including those described in Cautionary Statement About Forward-Looking Statements and Information above, Item 1A. Risk Factors of Part II of this Quarterly Report and Item 1A. Risk Factors of Part I of our 2020 Annual Report, and those factors have caused fluctuations in our results in the past and are expected to cause fluctuations in our results in the future. Additional information with respect to certain of those factors is provided below.

Seasonality. Typically, our revenues are lowest in the first quarter of the year because cold, snowy or wet conditions can create challenging working environments that are more costly for our customers or cause delays on projects. In addition, infrastructure projects often do not begin in a meaningful way until our customers finalize their capital budgets, which typically occurs during the first quarter. Second quarter revenues are typically higher than those in the first quarter, as some projects begin, but continued cold and wet weather can often impact productivity. Third quarter revenues are typically the highest of the year, as a greater number of projects are underway and operating conditions, including weather, are normally more accommodating. Generally, revenues during the fourth quarter are lower than the third quarter but higher than the second quarter, as many projects are completed and customers often seek to spend their capital budgets before year end. However, the holiday season and inclement weather can sometimes cause delays during the fourth quarter, reducing revenues and increasing costs. These seasonal impacts are typical for our U.S. operations, but seasonality for our international operations may differ. For example, revenues in Canada are typically higher in the first quarter because projects are often accelerated in order to complete work while the ground is frozen and prior to the break up, or seasonal thaw, as productivity is adversely affected by wet ground conditions during warmer months. Additionally, the COVID-19 pandemic affected typical seasonality during 2020, and our typical seasonality could also be impacted during the remainder of 2021 due to continued uncertainty regarding the future impact of the pandemic.

Weather, natural disasters and emergencies. The results of our business in a given period can be impacted by adverse weather conditions, severe weather events, natural disasters or other emergencies, which include, among other things, heavy or prolonged snowfall or rainfall, hurricanes, tropical storms, tornadoes, floods, blizzards, extreme temperatures, wildfires, post-wildfire floods and debris flows, pandemics (including the ongoing COVID-19 pandemic) and earthquakes. These conditions and events can negatively impact our financial results due to, among other things, the termination, deferral or delay of projects, reduced productivity and exposure to significant liabilities. See Overview – Business Environment above for further discussion regarding the impact of the COVID-19 pandemic. However, in some cases, severe weather events can increase our emergency restoration services, which typically yield higher margins due in part to higher equipment utilization and absorption of fixed costs.

Demand for services. We perform the majority of our services under existing contracts, including master service agreements (MSAs) and similar agreements pursuant to which our customers are not committed to specific volumes of our services. Therefore our volume of business can be positively or negatively affected by fluctuations in the amount of work our customers assign us in a given period, which may vary by geographic region. For example, to the extent our customers accelerate grid modernization or hardening programs or face deadlines to meet regulatory requirements for rehabilitation, reliability or efficiency, our volume of work could increase under existing agreements. Also, as described above in Overview – Business Environment, we have experienced reductions in demand for certain services as a result of the COVID-19 pandemic, as well as the currently challenged energy market. Examples of other items that may cause demand for our services to fluctuate materially from quarter to quarter include: the financial condition of our customers, their capital spending and their access to capital; economic and political conditions on a regional, national or global scale, including interest rates, governmental regulations affecting the sourcing of materials and equipment, and other changes in U.S. and global trade relationships; and project deferrals and cancellations.

Revenue mix and impact on margins. The mix of revenues based on the types of services we provide in a given period will impact margins, as certain industries and services provide higher-margin opportunities. Our larger or more complex

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projects typically include, among others, electric transmission projects with higher voltage capacities; pipeline projects with larger-diameter throughput capacities; large-scale renewable generation projects, which we expect to increase subsequent to our acquisition of Blattner; and projects with increased engineering, design or construction complexities, more difficult terrain or geographical requirements, or longer distance requirements. These projects typically yield opportunities for higher margins than our recurring services under MSAs described above, as we assume a greater degree of performance risk and there is greater utilization of our resources for longer construction timeframes. However, larger projects are subject to additional risk of regulatory delay and cyclicality. For example, our revenues with respect to larger electric transmission and pipeline projects have declined significantly in recent years, and a significant number of larger projects have been delayed or cancelled during that same period. Project schedules also fluctuate, particularly in connection with larger, more complex or longer-term projects, which can affect the amount of work performed in a given period. Furthermore, smaller or less complex projects typically have a greater number of companies competing for them, and competitors at times may more aggressively pursue available work. A greater percentage of smaller scale or less complex work also could negatively impact margins due to the inefficiency of transitioning between a greater number of smaller projects versus continuous production on fewer larger projects. As a result, at times we may choose to maintain a portion of our workforce and equipment in an underutilized capacity to ensure we are strategically positioned to deliver on larger projects when they move forward.

Project variability and performance. Margins for a single project may fluctuate period to period due to changes in the volume or type of work performed, the pricing structure under the project contract or job productivity. Additionally, our productivity and performance on a project can vary period to period based on a number of factors, including unexpected project difficulties or site conditions (including in connection with difficult geographic characteristics); project location, including locations with challenging operating conditions; whether the work is on an open or encumbered right of way; inclement weather or severe weather events; environmental restrictions or regulatory delays; protests, other political activity or legal challenges related to a project; and the performance of third parties. Moreover, we currently generate a significant portion of our revenues under fixed price contracts, and fixed price contracts are more common in connection with our larger and more complex projects that typically involve greater performance risk. Furthermore, subsequent to our acquisition of Blattner, we expect the portion of our revenues generated under fixed price contracts to increase significantly. Under these contracts, we assume risks related to project estimates and execution, and project revenues can vary, sometimes substantially, from our original projections due to a variety of factors, including the additional complexity, timing uncertainty or extended bidding, regulatory and permitting processes associated with these projects. These variations can result in a reduction in expected profit or the incurrence of losses on a project or the issuance of change orders or assertion of contract claims against customers. See Revenue Recognition - Contract Estimates in Note 2 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report for further information regarding changes in estimated contract revenues and/or project costs, including any significant project gains or losses in connection with fixed price contracts that have impacted our results, and determinations with respect to the recognition of change orders and claims as contract price adjustments.

Subcontract work and provision of materials. Work that is subcontracted to other service providers generally yields lower margins, and therefore an increase in subcontract work in a given period can decrease margins. In recent years, we have subcontracted approximately 15% to 20% of our work to other service providers. Our customers are usually responsible for supplying the materials for their projects. However, under some contracts, including contracts for projects where we provide engineering, procurement and construction (EPC) services, we agree to procure all or part of the required materials. Margins may be lower on projects where we furnish a significant amount of materials, as our markup on materials is generally lower than our markup on labor costs, and in a given period an increase in the percentage of work with greater materials procurement requirements may decrease our overall margins. Furthermore, fluctuations in the price or availability of materials and equipment we or our customers procure may impact our margins or cause delays on projects, including as a result of inflation; supply chain and other logistical challenges resulting from the COVID-19 pandemic or otherwise; governmental regulations affecting the sourcing of materials and equipment and other changes in U.S. or global trade relationships; or other economic or political conditions.

Foreign currency risk. Our financial performance is reported on a U.S. dollar-denominated basis but is partially subject to fluctuations in foreign currency exchange rates. Fluctuations in exchange rates relative to the U.S. dollar, primarily Canadian dollars and Australian dollars, can materially impact our results of operations and impact comparability between periods.

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Results of Operations

The results of acquired businesses have been included in the following results of operations beginning on their respective acquisition dates. The following table sets forth selected statements of operations data, such data as a percentage of revenues for the periods indicated, as well as the dollar and percentage change from the prior period (dollars in thousands):

Consolidated Results

Three months ended September 30, 2021 compared to the three months ended September 30, 2020

	Three Months Ended September 30,								Change
	2021				2020				$		%
Revenues	$	3,353,278	100.0	%	$	3,020,161	100.0	%	$	333,117	11.0	%
Cost of services (including depreciation)	2,818,602		84.1		2,512,647		83.2		305,955		12.2	%
Gross profit	534,676		15.9		507,514		16.8		27,162		5.4	%
Equity in earnings of integral unconsolidated affiliates	10,232		0.3		5,120		0.2		5,112		99.8	%
Selling, general and administrative expenses	(274,846)		(8.2)		(250,654)		(8.3)		(24,192)		9.7	%
Amortization of intangible assets	(22,772)		(0.6)		(19,687)		(0.7)		(3,085)		15.7	%
Change in fair value of contingent consideration liabilities	787		—		(78)		—		865		*
Operating income	248,077		7.4		242,215		8.0		5,862		2.4	%
Interest expense	(17,259)		(0.5)		(11,049)		(0.4)		(6,210)		56.2	%
Interest income	72		—		80		—		(8)		(10.0)	%
Other income (expense), net	6,089		0.2		2,931		0.2		3,158		107.7	%
Income before income taxes	236,979		7.1		234,177		7.8		2,802		1.2	%
Provision for income taxes	61,581		1.9		70,477		2.4		(8,896)		(12.6)	%
Net income	175,398		5.2		163,700		5.4		11,698		7.1	%
Less: Net income attributable to non-controlling interests	1,033		—		787		—		246		31.3	%
Net income attributable to common stock	$	174,365	5.2	%	$	162,913	5.4	%	$	11,452	7.0	%

* The percentage change is not meaningful.

Revenues. Revenues increased primarily due to a $220.8 million increase in revenues from our Electric Power Infrastructure Solutions segment as a result of strong demand for our electric power services and a $112.3 million increase in revenues from our Underground Utility and Infrastructure Solutions segment as a result of increased demand for gas distribution and industrial services. See Segment Results below for additional information and discussion related to segment revenues.

Gross profit. Gross profit increased due to the increase in revenues and improved utilization and fixed cost absorption in both our Electric Power Infrastructure Solutions segment and Underground Utility and Infrastructure Solutions segment. See Segment Results below for additional information and discussion related to segment operating income (loss).

Equity in earnings of integral unconsolidated affiliates. The amount for the three months ended September 30, 2021 primarily relates to our portion of amounts earned by LUMA Energy, LLC (LUMA).

Selling, general and administrative expenses. Selling, general and administrative expenses as a percentage of revenues decreased to 8.2% for the three months ended September 30, 2021, as compared to 8.3% for the three months ended September 30, 2020. The increase in selling, general and administrative expenses was partially attributable to a $15.2 million increase in compensation expense, which was primarily due to increased personnel to support business growth and increased incentive compensation expense as a result of higher levels of operating performance, and a $5.0 million increase in travel and related expenses, which were below historical levels in 2020 as a result of the COVID-19 pandemic. These increased expenses were partially offset by a $3.3 million decrease in expense related to deferred compensation liabilities. The changes in fair market value of deferred compensation liabilities were offset by corresponding changes in the fair market value of assets associated with the deferred compensation plan, and these corresponding changes are included in other income (expense), net.

Amortization of intangible assets. The increase was primarily due to amortization of intangible assets associated with recently acquired businesses, partially offset by reduced amortization expense from older acquired intangible assets, as certain of those assets became fully amortized.

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Change in fair value of contingent consideration liabilities. Contingent consideration liabilities are payable in the event certain performance objectives are achieved by an acquired business during designated post-acquisition periods. The change in fair value associated with these liabilities was primarily due to changes in performance in post-acquisition measurement periods by certain acquired businesses and the effect of present value accretion on fair value calculations. Further changes in fair value are expected to be recorded periodically until the contingent consideration liabilities are settled.

Interest expense. Interest expense increased for the three months ended September 30, 2021 primarily due to higher levels of debt and a higher weighted average interest rate as compared to the three months ended September 30, 2020.

Other income (expense), net. The net other income for the three months ended September 30, 2021 included $4.9 million related to foreign currency exchange gains, as compared to $1.5 million related to foreign currency exchange gains for the three months ended September 30, 2020. Also included in other income (expense), net for the three months ended September 30, 2021 was $0.2 million of expense associated with our deferred compensation plan, as compared to $2.8 million of income during the three months ended September 30, 2020. The amounts associated with the deferred compensation plan were largely offset by corresponding changes in the fair market value of the liabilities associated with our deferred compensation plan, which are recorded in selling, general, and administrative expenses, as discussed above.

Provision for income taxes. The effective tax rates for the three months ended September 30, 2021 and 2020 were 26.0% and 30.1%. The lower rate for the three months ended September 30, 2021 was primarily due to changes in the mix of earnings among various taxing jurisdictions.

Other comprehensive income (loss). Other comprehensive income (loss) results from translation of the balance sheets of our foreign operating units, which are primarily located in Canada and Australia and have functional currencies other than the U.S. dollar, and therefore are affected by the strengthening or weakening of the U.S. dollar against such currencies. The loss in the three months ended September 30, 2021 was primarily impacted by the strengthening of the U.S. dollar against the Canadian and Australian dollars as of September 30, 2021 when compared to June 30, 2021. The gain in the three months ended September 30, 2020 was primarily impacted by the weakening of the U.S. dollar against the Canadian and Australian dollars as of September 30, 2020 when compared to June 30, 2020.

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Nine months ended September 30, 2021 compared to the nine months ended September 30, 2020

The following table sets forth selected statements of operations data, such data as a percentage of revenues for the periods indicated, as well as the dollar and percentage change from the prior period (dollars in thousands):

	Nine Months Ended September 30,								Change
	2021				2020				$		%
Revenues	$	9,056,675	100.0	%	$	8,290,487	100.0	%	$	766,188	9.2	%
Cost of services (including depreciation)	7,701,398		85.0		7,095,513		85.6		605,885		8.5	%
Gross profit	1,355,277		15.0		1,194,974		14.4		160,303		13.4	%
Equity in earnings of integral unconsolidated affiliates	22,865		0.3		6,165		0.1		16,700		270.9	%
Selling, general and administrative expenses	(788,308)		(8.7)		(709,299)		(8.6)		(79,009)		11.1	%
Amortization of intangible assets	(65,418)		(0.8)		(55,374)		(0.6)		(10,044)		18.1	%
Asset impairment charges	(2,319)		—		—		—		(2,319)		*
Change in fair value of contingent consideration liabilities	1,360		—		(598)		—		1,958		*
Operating income	523,457		5.8		435,868		5.3		87,589		20.1	%
Interest expense	(42,843)		(0.5)		(33,709)		(0.4)		(9,134)		27.1	%
Interest income	3,098		—		1,114		—		1,984		178.1	%
Other income (expense), net	18,232		0.2		(3,649)		(0.1)		21,881		*
Income before income taxes	501,944		5.5		399,624		4.8		102,320		25.6	%
Provision for income taxes	116,256		1.2		119,626		1.4		(3,370)		(2.8)	%
Net income	385,688		4.3		279,998		3.4		105,690		37.7	%
Less: Net income attributable to non-controlling interests	4,529		0.1		4,453		0.1		76		1.7	%
Net income attributable to common stock	$	381,159	4.2	%	$	275,545	3.3	%	$	105,614	38.3	%

* The percentage change is not meaningful.

Revenues. The increase in revenues was primarily due to increased revenues of $868.8 million from our Electric Power Infrastructure Solutions segment due to strong demand for our electric power services, partially offset by decreased revenues of $102.6 million from our Underground Utility and Infrastructure Solutions segment, primarily due to a reduction in services related to large pipeline transmission projects and the challenged energy market conditions, which have been exacerbated by the COVID-19 pandemic. This reduction in services in our Underground Utility and Infrastructure Solutions segment was partially offset by an increase in demand for gas distribution and industrial services during the nine months ended September 30, 2021. See Segment Results below for additional information and discussion related to segment revenues.

Gross profit. Gross profit increased due to an increase in revenues and improved utilization and fixed cost absorption from our Electric Power Infrastructure Solutions segment, partially offset by reduced revenues and decreased utilization and fixed cost absorption from our Underground Utility and Infrastructure Solutions segment. See Segment Results below for additional information and discussion related to segment operating income (loss).

Equity in earnings of integral unconsolidated affiliates. The amount for the nine months ended September 30, 2021 primarily relates to our portion of amounts earned by LUMA.

Selling, general and administrative expenses. Selling, general and administrative expenses as a percentage of revenues increased to 8.7% for the nine months ended September 30, 2021 from 8.6% for the nine months ended September 30, 2020. The increase in selling, general and administrative expenses was attributable to a $26.7 million increase in compensation expense, largely associated with increased incentive and non-cash stock compensation expense as a result of higher levels of operating performance and an increase in salaries and benefits due to increased personnel to support business growth; a $21.9 million increase in expenses associated with acquired businesses; and a $21.3 million increase in provision for credit loss, primarily related to the recognition of the provision for credit loss related to a receivable from a customer that declared bankruptcy in July 2021 and its affiliate, which is described further in Concentrations of Credit Risk within Note 2 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report. Also contributing to the increase were a $4.8 million increase in travel and related expenses, which were below historical levels in 2020 as a result of the COVID-19 pandemic, and a $4.1 million increase in expense related to deferred compensation liabilities. The fair market value changes in deferred compensation liabilities were offset by changes in the fair value of assets associated

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with the deferred compensation plan, which are included in other income (expense), net below. Partially offsetting these increases were $6.5 million of incremental gains on sales of property and equipment.

Amortization of intangible assets. The increase was primarily due to amortization of intangible assets associated with recently acquired businesses, partially offset by reduced amortization expense associated with older acquired intangible assets, as certain of these assets became fully amortized.

Asset impairment charges. During the nine months ended September 30, 2021, we recognized a $2.3 million asset impairment charge related to certain equipment that was not utilized in our core operations and was subsequently sold in October 2021.

Change in fair value of contingent consideration liabilities. Contingent consideration liabilities are payable in the event certain performance objectives are achieved by an acquired business during designated post-acquisition periods. The change in fair value associated with these liabilities was primarily due to changes in performance in post-acquisition measurement periods by certain acquired businesses and the effect of present value accretion on fair value calculations. Further changes in fair value are expected to be recorded periodically until the contingent consideration liabilities are settled.

Interest expense. Interest expense increased primarily due to higher levels of outstanding debt and a higher weighted average interest rate during the nine months ended September 30, 2021 compared to 2020.

Interest income. Interest income increased primarily due to interest received related to a settlement with a customer.

Other income (expense), net. The net other income for the nine months ended September 30, 2021 included $6.5 million related to foreign currency exchange gains, as compared to $4.9 million of foreign currency exchange gains for the nine months ended September 30, 2020. Also favorably impacting other income was $5.3 million of income associated with our deferred compensation plan, as compared to $1.9 million of income in 2020. This income related to the deferred compensation plan was largely offset by corresponding changes in the fair market value of the liabilities associated with our deferred compensation plan, which are recorded in selling, general, and administrative expenses, as discussed above. Also favorably impacting the nine months ended September 30, 2021 were a $2.5 million benefit payment from a company-owned life insurance policy held in connection with our deferred compensation plan and $1.9 million of equity in earnings of non-integral unconsolidated affiliates. The net other expense for the nine months ended September 30, 2020 also included a $9.3 million impairment associated with an investment in a water and gas pipeline infrastructure contractor located in Australia that is accounted for using the cost method of accounting and $8.7 million of impairments associated with two non-integral equity investments that were negatively impacted by the decline in demand for refined petroleum products, which were partially offset by an $8.9 million legal settlement received.

Provision for income taxes. The effective tax rates for the nine months ended September 30, 2021 and 2020 were 23.2% and 29.9%. The lower rate for the nine months ended September 30, 2021 was primarily due to the recognition of an $19.7 million tax benefit that resulted from equity incentive awards vesting at a higher fair market value than their grant date fair market value, as compared to the recognition of $2.6 million associated with this tax benefit for the nine months ended September 30, 2020, which was due to a smaller difference between the vest date fair market value and grant date fair market value of vested equity incentive awards.

Other comprehensive income (loss). Other comprehensive income (loss) results from translation of the balance sheets of our foreign operating units, which are primarily located in Canada and Australia and have functional currencies other than the U.S. dollar, and therefore are affected by the strengthening or weakening of the U.S. dollar against such currencies. The loss in the nine months ended September 30, 2021 was impacted primarily by the strengthening of the U.S. dollar against the Australian dollar as of September 30, 2021 when compared to December 31, 2020. The loss in the nine months ended September 30, 2020 was impacted by the strengthening of the U.S. dollar against both the Canadian and Australian dollars as of September 30, 2020 when compared to December 31, 2019.

Segment Results

Reportable segment information, including revenues and operating income by type of work, is gathered from each operating unit for the purpose of evaluating segment performance. Classification of our operating unit revenues by type of work for segment reporting purposes can at times require judgment on the part of management. Our operating units may perform joint projects for customers in multiple industries, deliver multiple types of services under a single customer contract or provide service offerings to various industries. For example, we perform joint trenching projects to install distribution lines for electric power and natural gas customers. Our integrated operations and common administrative support for operating units require that certain allocations be made to determine segment profitability, including allocations of shared and indirect costs (e.g., facility costs), indirect operating expenses (e.g., depreciation), and general and administrative costs. Certain corporate costs are not allocated, including payroll and benefits, employee travel expenses, facility costs, professional fees, acquisition costs, non-cash

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stock-based compensation, amortization related to intangible assets, asset impairment related to goodwill and intangible assets and change in fair value of contingent consideration liabilities.

Three months ended September 30, 2021 compared to the three months ended September 30, 2020

The following table sets forth segment revenues, segment operating income (loss) and operating margins for the periods indicated, as well as the dollar and percentage change from the prior period. Operating margins are calculated by dividing operating income by revenues. Management utilizes operating margins as a measure of profitability, which can be helpful for monitoring how effectively we are performing under our contracts. Management also believes operating margins are a useful metric for investors to utilize in evaluating our performance. The following table shows dollars in thousands.

	Three Months Ended September 30,								Change
	2021				2020				$		%
Revenues:
Electric Power Infrastructure Solutions	$	2,328,468	69.4	%	$	2,107,621	69.8	%	$	220,847	10.5	%
Underground Utility and Infrastructure Solutions	1,024,810		30.6		912,540		30.2		112,270		12.3	%
Consolidated revenues	$	3,353,278	100.0	%	$	3,020,161	100.0	%	$	333,117	11.0	%
Operating income (loss):
Electric Power Infrastructure Solutions before equity in earnings of integral unconsolidated affiliates	$	278,051	11.9	%	$	263,257	12.5	%	$	14,794	5.6	%
Equity in earnings of integral unconsolidated affiliates	10,232		N/A		5,119		N/A		5,113		99.9	%
Electric Power Infrastructure Solutions	288,283		12.4	%	268,376		12.7	%	$	19,907	7.4	%
Underground Utility and Infrastructure Solutions	68,167		6.7	%	76,220		8.4	%	(8,053)		(10.6)	%
Corporate and Non-Allocated Costs	(108,373)		N/A		(102,381)		N/A		(5,992)		5.9	%
Consolidated operating income	$	248,077	7.4	%	$	242,215	8.0	%	$	5,862	2.4	%

Electric Power Infrastructure Solutions Segment Results

The increase in revenues for the three months ended September 30, 2021 was primarily due to continued favorable dynamics across our core utility market and increased demand for our electric power services, as well as a $55 million increase in revenues attributable to acquired businesses. Additionally, revenues for the three months ended September 30, 2021 were positively impacted by $27 million in incremental emergency restoration services revenues and $15 million related to more favorable foreign currency exchange rates, primarily the Canadian dollar and U.S. dollar exchange rate.

The increase in operating income was primarily attributable to increased revenues. The decrease in operating margin was primarily attributable to normal project variability and higher general and administrative expenses during the three months ended September 30, 2021 as compared to lower than normal levels of general and administrative expenses for the three months ended September 30, 2020. Favorably impacting operating income and operating margin during the three months ended September 30, 2021 was the incremental impact of our equity interest in LUMA.

In addition, in early 2020, we decided to pursue an exit of our operations in Latin America and substantially completed such exit as of December 31, 2020. For the three months ended September 30, 2020, Electric Power Infrastructure Solutions operating income included $15.4 million of operating losses related to Latin American operations, which negatively impacted operating margin by 80 basis points.

Underground Utility and Infrastructure Solutions Segment Results

The increase in revenues for the three months ended September 30, 2021 was primarily due to increased demand for gas distribution and industrial services. Revenues were also favorably impacted by a $10 million increase in revenues attributable to acquired businesses and $6 million related to more favorable foreign currency exchange rates, primarily the Canadian dollar and U.S. dollar exchange rate. The increase in revenues attributable to these items was partially offset by disruptions along the U.S. Gulf Coast attributable to Hurricane Ida and broader challenges in the energy market that negatively impacted our industrial services operations, as well as governmental restrictions and protocols associated with the COVID-19 pandemic that negatively impacted our operations in non-U.S. markets.

The decrease in operating income and operating margin was primarily due to more favorable adjustments on certain large pipeline projects during the three months ended September 30, 2020, which were associated with the recognition of previously

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deferred milestone payments and reduced contingencies due to a reduction in the scope of work on a project that is now complete, as well as the completion of certain other projects earlier than anticipated. Additionally, as referenced above, operating income for both the three months ended September 30, 2021 and 2020 were adversely impacted by the COVID-19 pandemic and the overall challenged energy market, with the greater negative impact occurring in the three months ended September 30, 2020 due to lower revenues from industrial services that negatively impacted our margins and ability to cover fixed and overhead costs.

Corporate and Non-Allocated Costs

The increase in corporate and non-allocated costs during the three months ended September 30, 2021 was primarily due to a $6.7 million increase in incentive compensation as a result of higher levels of operating performance relative to incentive compensation targets, a $3.1 million increase in intangible asset amortization, a $1.9 million increase in salaries and benefits due to increased personnel to support business growth and a $1.6 million increase in travel and related expenses, which were below historical levels in 2020 as a result of the COVID-19 pandemic. Partially offsetting these increases were a $4.2 million decrease in acquisition and integration costs and a $3.3 million decrease in expense related to deferred compensation liabilities. The changes in fair market value of deferred compensation liabilities were offset by corresponding changes in the fair market value of assets associated with the deferred compensation plan, which are recorded in other income (expense), net.

Nine months ended September 30, 2021 compared to the nine months ended September 30, 2020

The following table sets forth segment revenues, segment operating income (loss) and operating margins for the periods indicated, as well as the dollar and percentage change from the prior period (dollars in thousands):

	Nine Months Ended September 30,								Change
	2021				2020				$		%
Revenues:
Electric Power Infrastructure Solutions	$	6,536,363	72.2	%	$	5,667,566	68.4	%	$	868,797	15.3	%
Underground Utility and Infrastructure Solutions	2,520,312		27.8		2,622,921		31.6		(102,609)		(3.9)	%
Consolidated revenues	$	9,056,675	100.0	%	$	8,290,487	100.0	%	$	766,188	9.2	%
Operating income (loss):
Electric Power Infrastructure Solutions before equity in earnings of integral unconsolidated affiliates	$	701,352	10.7	%	$	574,865	10.1	%	$	126,487	22.0	%
Equity in earnings of integral unconsolidated affiliates	22,865		N/A		6,165		N/A		16,700		270.9	%
Electric Power Infrastructure Solutions	724,217		11.1	%	581,030		10.3	%	143,187		24.6	%
Underground Utility and Infrastructure Solutions	100,917		4.0	%	128,747		4.9	%	(27,830)		(21.6)	%
Corporate and Non-Allocated Costs	(301,677)		N/A		(273,909)		N/A		(27,768)		10.1	%
Consolidated operating income	$	523,457	5.8	%	$	435,868	5.3	%	$	87,589	20.1	%

Electric Power Infrastructure Solutions Segment Results

The increase in revenues for the nine months ended September 30, 2021 was primarily due to continued favorable dynamics across our core utility market and increased demand for our electric power services, as well as a $195 million increase in revenues attributable to acquired businesses. Additionally, revenues for the nine months ended September 30, 2021 were positively impacted by $80 million related to more favorable foreign currency exchange rates, primarily the Canadian dollar and U.S. dollar exchange rate, and a $53 million increase in emergency restoration services revenues.

The increase in operating income and operating margin was primarily attributable to improved performance across the segment, including increased revenues from large transmission projects and emergency restoration services revenues, both of which contributed to improved equipment utilization and fixed cost absorption. Also favorably impacting operating income and operating income as a percentage of revenues during the nine months ended September 30, 2021 was the incremental impact of our equity interest in LUMA. Partially offsetting the positive impact of these items were losses resulting from poor subcontractor performance, challenging site conditions and weather and seasonal impacts on certain communications projects during the first quarter of 2021.

In addition, in early 2020, we decided to pursue an exit of our operations in Latin America and substantially completed such exit as of December 31, 2020. For the nine months ended September 30, 2020, Electric Power Infrastructure Solutions

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operating income included $46.9 million of operating losses related to Latin American operations, which negatively impacted operating margin by 80 basis points.

Underground Utility and Infrastructure Solutions Segment Results

The decrease in revenues for the nine months ended September 30, 2021 was partially due to reduced revenues associated with large pipeline projects, as the industry has entered the late-stage of the current construction cycle for these projects and the anticipated next cycle of projects has been delayed due to various factors, including, among other things, permitting delays and worksite access limitations related to environmental regulations. Revenues also declined due to lower demand for our services in end markets where the price of oil is influential, as well as reduced capital spending and deferred regularly scheduled maintenance by our midstream and industrial customers as a result of the COVID-19 pandemic. These decreases were partially offset by increased demand for gas distribution services; approximately $20 million in revenues from acquired businesses; and $19 million related to more favorable foreign currency exchange rates, primarily the Canadian dollar and U.S. dollar exchange rate.

The decreases in operating income and operating margin were primarily due to the recognition of a $23.6 million provision for credit loss related to a receivable from a customer that declared bankruptcy in July 2021 and its affiliate, which is described further in Current and Long-Term Accounts Receivable and Allowance for Credit Losses within Note 2 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report, and, to a lesser extent, a $2.3 million asset impairment charge related to the planned sale of certain equipment not utilized in our core operations and that was subsequently sold in October 2021. Additionally, operating income for both the nine months ended September 30, 2021 and 2020 were adversely impacted by the COVID-19 pandemic and the overall challenged energy market, which negatively impacted our margins and ability to cover fixed and overhead costs.

Corporate and Non-Allocated Costs

The increase in corporate and non-allocated costs during the nine months ended September 30, 2021 was primarily due to a $10.0 million increase in intangible asset amortization, a $9.2 million increase in incentive and non-cash stock compensation as a result of higher levels of operating performance relative to incentive compensation targets and a $4.5 million increase in expense related to deferred compensation liabilities. The changes in fair market value of deferred compensation liabilities were offset by corresponding changes in the fair market value of assets associated with the deferred compensation plan, which are recorded in other income (expense), net. Also contributing to the increase was a $3.4 million increase in salaries and benefits expense due to increased personnel to support business growth. These increases were partially offset by a $5.2 million decrease in professional fees and a $3.4 million decrease in acquisition and integration costs.

Non-GAAP Financial Measures

EBITDA and Adjusted EBITDA

EBITDA and adjusted EBITDA, financial measures not recognized under GAAP, when used in connection with net income attributable to common stock, are intended to provide useful information to investors and analysts as they evaluate our performance. EBITDA is defined as earnings before interest, taxes, depreciation and amortization, and adjusted EBITDA is defined as EBITDA adjusted for certain other items as described below. These measures should not be considered as an alternative to net income attributable to common stock or other financial measures of performance that are derived in accordance with GAAP. Management believes that the exclusion of these items from net income attributable to common stock enables it and its investors to more effectively evaluate our operations period over period and to identify operating trends that might not be apparent when including the excluded items.

As to certain of the items below, (i) non-cash stock-based compensation expense varies from period to period due to acquisition activity, changes in the estimated fair value of performance-based awards, forfeiture rates, accelerated vesting and amounts granted; (ii) acquisition and integration costs vary from period to period depending on the level of our acquisition activity; (iii) equity in (earnings) losses of non-integral unconsolidated affiliates varies from period to period depending on the activity and financial performance of non-integral unconsolidated affiliates, including gain or loss on sales of investments accounted for using the equity method of accounting; (iv) asset impairment charges can vary from period to period depending on economic and other factors; and (v) change in fair value of contingent consideration liabilities varies from period to period depending on the performance in post-acquisition periods of certain acquired businesses. Because EBITDA and adjusted EBITDA, as defined, exclude some, but not all, items that affect net income attributable to common stock, such measures may not be comparable to similarly titled measures of other companies. The most comparable GAAP financial measure, net income

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attributable to common stock, and information reconciling the GAAP and non-GAAP financial measures, are included below. The following table shows dollars in thousands.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Net income attributable to common stock (GAAP as reported)	$	174,365	$	162,913	$	381,159	$	275,545
Interest expense	17,259		11,049		42,843		33,709
Interest income	(72)		(80)		(3,098)		(1,114)
Provision for income taxes	61,581		70,477		116,256		119,626
Depreciation expense	61,616		56,244		186,480		165,180
Amortization of intangible assets	22,772		19,687		65,418		55,374
Income taxes and depreciation included in equity in earnings of integral unconsolidated affiliates	2,825		1,275		6,476		1,682
EBITDA (a)	340,346		321,565		795,534		650,002
Non-cash stock-based compensation	21,642		21,431		64,252		58,323
Acquisition and integration costs	6,193		10,352		9,521		12,882
Equity in (earnings) losses of non-integral unconsolidated affiliates	(526)		(140)		(1,869)		8,372
Asset impairment charges (b)	—		—		2,319		—
Change in fair value of contingent consideration liabilities	(787)		78		(1,360)		598
Adjusted EBITDA	$	366,868	$	353,286	$	868,397	$	730,177

(a) The calculations of EBITDA for the three and nine months ended September 30, 2020 have been amended to conform to the current period calculations of EBITDA.

(b) The amount reflects an asset impairment charge related to the sale of certain equipment not utilized in our core operations.

Remaining Performance Obligations and Backlog

A performance obligation is a promise in a contract with a customer to transfer a distinct good or service. Our remaining performance obligations represent management’s estimate of consolidated revenues that are expected to be realized from the remaining portion of firm orders under fixed price contracts not yet completed or for which work has not yet begun, which includes estimated revenues attributable to consolidated joint ventures and variable interest entities (VIEs), revenues from funded and unfunded portions of government contracts to the extent they are reasonably expected to be realized, and revenues from change orders and claims to the extent management believes they will be earned and are probable of collection.

We have also historically disclosed our backlog, a measure commonly used in our industry but not recognized under GAAP. We believe this measure enables management to more effectively forecast our future capital needs and results and better identify future operating trends that may not otherwise be apparent. We believe this measure is also useful for investors in forecasting our future results and comparing us to our competitors. Our remaining performance obligations are a component of backlog, which also includes estimated orders under MSAs, including estimated renewals, and non-fixed price contracts expected to be completed within one year. Our methodology for determining backlog may not be comparable to the methodologies used by other companies.

As of September 30, 2021 and December 31, 2020, MSAs accounted for 62% and 63% of our estimated 12-month backlog and 69% and 70% of total backlog. We anticipate that subsequent to our acquisition of Blattner, MSAs may account for a lower percentage of our backlog because Blattner does not currently have a significant amount of backlog attributable to MSAs. Generally, our customers are not contractually committed to specific volumes of services under our MSAs, and most of our contracts can be terminated on short notice even if we are not in default. We determine the estimated backlog for these MSAs using recurring historical trends, factoring in seasonal demand and projected customer needs based upon ongoing communications. In addition, many of our MSAs are subject to renewal, and these potential renewals are considered in determining estimated backlog. As a result, estimates for remaining performance obligations and backlog are subject to change based on, among other things, project accelerations; project cancellations or delays, including but not limited to those caused by commercial issues, regulatory requirements, natural disasters, emergencies (including the ongoing COVID-19 pandemic) and adverse weather conditions; and final acceptance of change orders by customers. These factors can cause revenues to be realized in periods and at levels that are different than originally projected.

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The following table reconciles total remaining performance obligations to our backlog (a non-GAAP financial measure) by reportable segment along with estimates of amounts expected to be realized within 12 months (in thousands):

	September 30, 2021				December 31, 2020
	12 Month		Total		12 Month		Total
Electric Power Infrastructure Solutions
Remaining performance obligations	$	2,819,561	$	3,706,869	$	2,511,157	$	3,547,838
Estimated orders under MSAs and short-term, non-fixed price contracts	4,299,273		9,025,234		3,559,443		7,433,445
Backlog	$	7,118,834	$	12,732,103	$	6,070,600	$	10,981,283
Underground Utility and Infrastructure Solutions
Remaining performance obligations	$	616,621	$	661,426	$	327,205	$	437,544
Estimated orders under MSAs and short-term, non-fixed price contracts	2,022,995		3,630,889		1,868,820		3,713,607
Backlog	$	2,639,616	$	4,292,315	$	2,196,025	$	4,151,151
Total
Remaining performance obligations	$	3,436,182	$	4,368,295	$	2,838,362	$	3,985,382
Estimated orders under MSAs and short-term, non-fixed price contracts	6,322,268		12,656,123		5,428,263		11,147,052
Backlog	$	9,758,450	$	17,024,418	$	8,266,625	$	15,132,434

Liquidity and Capital Resources

Cash Requirements

Management monitors financial markets and national and global economic conditions for factors that may affect our liquidity and capital resources. We consider our investment policies related to cash and cash equivalents to be conservative in that we maintain a diverse portfolio of what we believe to be high-quality cash and cash equivalent investments with short-term maturities. While the extent of the impact of the challenged energy market, as well as the COVID-19 pandemic, on our future operational and financial performance will depend on future developments and remains uncertain, based on our current business forecast for the next twelve months, we anticipate that our cash and cash equivalents on hand, future cash flows from operations, existing borrowing capacity under our senior credit facility and other available financing alternatives will provide sufficient funds during the next twelve months to enable us to fund ongoing operating needs, facilitate our ability to repurchase stock and pay any future dividends we declare, fund acquisitions or strategic investments that facilitate the long-term growth and sustainability of our business, fund essential capital expenditures and make` payments related to obligations on our outstanding debt.

Our industry is capital intensive, and we expect substantial capital expenditures and commitments under equipment lease and rental arrangements to be needed into the foreseeable future in order to meet anticipated demand for our services. We expect capital expenditures for the year ended December 31, 2021 to be approximately $325 million. Additionally, refer to Contractual Obligations and Contingencies below for a summary of our future contractual obligations and a description of other contingencies as of September 30, 2021 and Off-Balance Sheet Arrangements below for a description of certain contingent obligations that are not recorded on our condensed consolidated balance sheets. Although any of these contingent obligations could require the use of cash in future periods, certain contingent obligations are excluded from the Contractual Obligations table because we are unable to accurately predict the timing and amount of such obligations as of September 30, 2021.

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Our available commitments under our senior credit facility and cash and cash equivalents at September 30, 2021 were as follows (in thousands):

	September 30, 2021
Total capacity available for revolving loans and letters of credit	$	2,510,000
Less:
Borrowings of revolving loans	415,851
Letters of credit outstanding	333,900
Available commitments for issuing revolving loans or new letters of credit	1,760,249
Plus:
Cash and cash equivalents	1,696,210
Total available commitments under senior credit facility and cash and cash equivalents	$	3,456,459

We may seek to access the capital markets from time to time to raise additional capital, increase liquidity as necessary, refinance or extend the term of our existing indebtedness, fund acquisitions or otherwise fund our capital needs. For example, as described further in Debt Instruments below, in connection with the financing of our acquisition of Blattner, in September 2021 we issued $1.50 billion aggregate principal amount of senior notes and received net proceeds of $1.48 billion, and in October 2021 we amended our senior credit facility to, among other things, provide for a new $750.0 million term loan facility and increase the aggregate revolving commitments of the lenders from $2.51 billion to $2.64 billion. The proceeds received from our issuance of senior notes in September 2021 represented a significant portion of the cash and cash equivalents balance at September 30, 2021, and such proceeds were utilized to fund the acquisition of Blattner on October 13, 2021. While our financial strategy and consistent performance have allowed us to maintain investment grade ratings subsequent to these financing transactions, our ability to access the capital markets in the future depends on a number of factors, including our financial performance and financial position, our credit ratings, industry conditions, general economic conditions, our backlog, capital expenditure commitments, market conditions and market perceptions of us and our industry.

Sources and Uses of Cash

In summary, our cash flows for each period were as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Net cash provided by operating activities	$	17,876	$	114,859	$	332,437	$	839,887
Net cash used in investing activities	$	(96,536)	$	(230,555)	$	(415,713)	$	(356,302)
Net cash provided by (used in) financing activities	$	1,563,590	$	(198,504)	$	1,594,826	$	(435,214)

Operating Activities

Cash flow from operating activities is primarily influenced by demand for our services and operating margins but is also influenced by working capital needs associated with the various types of services that we provide. Our working capital needs may increase when we commence large volumes of work under circumstances where project costs, primarily labor, equipment and subcontractors, are required to be paid before the associated receivables are billed and collected. Accordingly, changes within working capital in accounts receivable, contract assets and contract liabilities are normally related and are typically affected on a collective basis by changes in revenue due to the timing and volume of work performed and variability in the timing of customer billings and payments. Additionally, working capital needs are generally higher during the summer and fall due to increased demand for our services when favorable weather conditions exist in many of our operating regions. Conversely, working capital assets are typically converted to cash during the winter. These seasonal trends can be offset by changes in project timing due to delays or accelerations and other economic factors that may affect customer spending, including market conditions or the impact of the COVID-19 pandemic.

Net cash provided by operating activities during the three and nine months ended September 30, 2021 was negatively impacted primarily by increased working capital requirements, including with respect to progress on two large electric transmission projects in Canada, and the timing of the associated billings. Both of the projects were negatively impacted by delays related to the COVID-19 pandemic and unrelated wildfires, and one project was also impacted by an acceleration of the project timeline, all of which resulted in change orders and an increase in contract assets. Partially offsetting this negative impact was the favorable impact of increased earnings as compared to the three and nine months ended September 30, 2020. As permitted under the CARES Act and other federal and state actions, during the three and nine months ended September 30,

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2020, we deferred the payment of $41.0 million and $72.2 million of payroll taxes, 50% of which are due by December 31, 2021 and the remainder of which are due by December 31, 2022. Also during the three months ended September 30, 2020, we paid $58.0 million of federal and state income taxes, the payment of which had been deferred during from the second quarter of 2020 as permitted under the CARES Act and other federal and state actions. Additionally, net cash provided by operating activities during the nine months ended September 30, 2020 was favorably impacted by the receipt of $82.0 million of insurance proceeds associated with the settlement of two pipeline project claims in the fourth quarter of 2019.

Days sales outstanding (DSO) represents the average number of days it takes revenues to be converted into cash, which management believes is an important metric for assessing liquidity. A decrease in DSO has a favorable impact on cash flow from operating activities, while an increase in DSO has a negative impact on cash flow from operating activities. DSO is calculated by using the sum of current accounts receivable, net of allowance (which includes retainage and unbilled balances), plus contract assets less contract liabilities, divided by average revenues per day during the quarter. DSO at September 30, 2021 was 89 days, which was higher than DSO of 82 days at September 30, 2020 and our five-year historical average DSO of 82 days primarily due to increased working capital requirements related to progress on two large electric transmission projects in Canada and the timing of the associated billings. Both of the projects were negatively impacted by delays related to the COVID-19 pandemic and unrelated wildfires, and one project was also impacted by an acceleration of the project timeline, all of which resulted in change orders and an increase in contract assets.

Investing Activities

Net cash used in investing activities in the three months ended September 30, 2021 included $74.6 million of capital expenditures, $33.3 million used for acquisitions and $5.2 million of cash paid for equity and other investments. Partially offsetting these items was $16.4 million of proceeds from the sale of property and equipment. Net cash used in investing activities in the nine months ended September 30, 2021 included $233.0 million of capital expenditures; $119.5 million of cash paid for equity and other investments, which primarily related to the acquisition of a minority interest in a broadband technology company; and $101.4 million used for acquisitions, some of which relates to acquisitions that closed in prior periods. These items were partially offset by $35.1 million of proceeds from the sale of property and equipment.

Net cash used in investing activities in the three months ended September 30, 2020 included $187.7 million used for acquisitions and $50.8 million of capital expenditures, which were partially offset by $5.8 million of proceeds from the sale of property and equipment. Net cash used in investing activities in the nine months ended September 30, 2020 included $212.1 million used for acquisitions, $167.0 million used for capital expenditures, and $9.5 million of cash paid for equity and other investments, which were partially offset by $18.5 million of proceeds from the sale of property and equipment and $11.1 million of proceeds from the disposition of businesses.

Our industry is capital intensive, and we expect substantial capital expenditures and commitments under equipment lease and rental arrangements to be needed into the foreseeable future. We also have various other capital commitments that are detailed in Contractual Obligations and Contingencies below. In addition, we expect to continue to pursue strategic acquisitions and investments, although we cannot predict the timing or amount of the cash needed for these initiatives.

Financing Activities

On September 23, 2021, we received net proceeds from the issuance of the 2024 notes, the 2032 notes and the 2041 notes of $1.49 billion, net of the original issue discount and underwriting discounts but not net of deferred financing costs paid or accrued by us. Deferred financing costs paid directly by us during the three months ended September 30, 2021 were $5.1 million, $0.7 million of which related to the September 2021 issuance of such senior notes and $4.4 million of which related to the bridge facility commitment entered into, but ultimately not utilized, in connection with our acquisition of Blattner. Total deferred financing costs associated with the senior notes that were accrued as of September 30, 2021 were $3.2 million and are expected to be paid primarily in the three months ended December 31, 2021 . See Debt Instruments – Senior Notes below for a further description of the Senior Notes. Although not reflected in the three or nine months ended September 30, 2021 condensed consolidated statements of cash flows, we used these proceeds, together with borrowings under a new term loan and revolving loans under our senior credit facility, to acquire Blattner in October 2021.

Net cash provided by financing activities in the three months ended September 30, 2021 also included $98.4 million of net borrowings under our senior credit facility and $13.6 million of net borrowings of short-term debt. These items were partially offset by $17.8 million of cash payments for common stock repurchases and $8.4 million of cash payments for dividends and cash dividend equivalents. Net cash provided by financing activities in the nine months ended September 30, 2021 also included $267.7 million of net borrowings under our senior credit facility and $9.4 million of net borrowings of short-term debt, partially offset by $66.7 million of cash payments for common stock repurchases, $63.1 million of cash payments to satisfy tax withholding obligations associated with stock-based compensation and $25.6 million of cash payments for dividends and cash dividend equivalents.

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On September 22, 2020, we received net proceeds from the issuance of our 2030 notes of $990.1 million, as described further in Debt Instruments – Senior Notes. These proceeds, together with cash on hand, were used to voluntarily prepay then-outstanding term loans, which is reflected in the $1.17 billion of net repayments under our senior credit facility. During the three months ended September 30, 2020, we also paid $7.8 million of deferred financing costs related to the issuance of such senior notes and $7.0 million of cash dividends and dividend equivalents. Net cash used in financing activities in the nine months ended September 30, 2020 included $200.0 million of cash payments for common stock repurchases, $1.15 billion of net repayments under our senior credit facility, $24.4 million of cash payments to satisfy tax withholding obligations associated with stock-based compensation, $21.5 million of cash payments for dividends and cash dividend equivalents, $10.4 million of payments to settle certain contingent consideration liabilities and $7.8 million of deferred financing costs.

Contingent Consideration Liabilities

Certain of our acquisitions include the potential payment of contingent consideration, payable in the event certain performance objectives are achieved by the acquired businesses during designated post-acquisition periods. Although our contingent consideration liabilities were not material as of September 30, 2021, the former owners of Blattner are eligible for the potential payment of up to $300 million of contingent consideration, payable to the extent Blattner achieves certain financial performance objectives over a three-year period beginning in January 2022. The aggregate fair value of the contingent consideration liability associated with Blattner as of the acquisition date has not yet been determined. Any liability would be paid in cash at the end of the three-year period and would include 5% interest, unless we elect to pay a portion at the end of each year within the performance period. Cash payments for these liabilities up to the amount recognized at the respective acquisition dates, including measurement-period adjustments, will be classified as financing activities in our consolidated statements of cash flows. Any cash payments in excess of the amount of contingent consideration liabilities recognized at the respective acquisition dates will be classified as operating activities in our consolidated statements of cash flows.

Stock Repurchases

We repurchased the following shares of common stock in the open market under our stock repurchase programs (in thousands):

Quarter ended:	Shares	Amount
September 30, 2021	185	$	16,828
June 30, 2021	314	$	29,450
March 31, 2021	222	$	17,710
December 31, 2020	720	$	49,949
September 30, 2020	—	$	—
June 30, 2020	—	$	—
March 31, 2020	5,960	$	200,000

As of September 30, 2021, we are authorized to repurchase up to an additional $472.8 million in shares of common stock through June 30, 2023 under our existing stock repurchase program. Our policy is to record a stock repurchase as of the trade date; however, the payment of cash related to a repurchase is made on the settlement date of the trade. During the three months ended September 30, 2021 and 2020, cash payments related to stock repurchases were $17.8 million and none. During the nine months ended September 30, 2021 and 2020, cash payments related to stock repurchases were $66.7 million and $200.0 million.

Repurchases under our repurchase programs may be implemented through open market or privately negotiated transactions, at management’s discretion, based on market and business conditions, applicable contractual and legal requirements, including restrictions under our senior credit facility, and other factors. We are not obligated to acquire any specific amount of common stock and the repurchase programs may be modified or terminated by our Board of Directors at any time at its sole discretion and without notice.

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    Dividends

We declared the following cash dividends and cash dividend equivalents during 2020 and the first nine months of 2021 (in thousands, except per share amounts):

Declaration	Record	Payment	Dividend		Dividends
Date	Date	Date	Per Share		Declared
August 27, 2021	October 1, 2021	October 15, 2021	$	0.06	$	8,638
May 27, 2021	July 1, 2021	July 15, 2021	$	0.06	$	8,650
March 25, 2021	April 6, 2021	April 15, 2021	$	0.06	$	8,429
December 11, 2020	January 4, 2021	January 15, 2021	$	0.06	$	8,933
August 26, 2020	October 1, 2020	October 15, 2020	$	0.05	$	7,244
May 28, 2020	July 1, 2020	July 15, 2020	$	0.05	$	7,182
March 26, 2020	April 6, 2020	April 15, 2020	$	0.05	$	7,184

The declaration, payment and amount of future cash dividends will be at the discretion of our Board of Directors after taking into account various factors, including our financial condition, results of operations and cash flows from operating activities; current and anticipated capital requirements and expansion plans; the current and potential impact of the COVID-19 pandemic and other market, industry, economic and political conditions; income tax laws then in effect; and the requirements of Delaware law. In addition, our Amended Credit Agreement restricts the payment of cash dividends unless certain conditions are met.

Debt Instruments

Senior Notes

On September 23, 2021, we issued $1.50 billion aggregate principal amount of senior notes consisting of: $500.0 million aggregate principal amount of the 2024 notes; $500.0 million aggregate principal amount of the 2032 notes; and $500.0 million aggregate principal amount of the 2041 notes. The cumulative proceeds received from the public offering of the 2024 notes, the 2032 notes and the 2041 notes were $1.48 billion, net of the original issue discount, underwriting discounts and deferred financing costs, which we used, along with borrowings under our senior credit facility, as amended, to complete the acquisition of Blattner. Additionally, on September 22, 2020, we issued $1.00 billion aggregate principal amount of 2.900% senior notes due October 2030 and received proceeds of $986.7 million from the offering, net of the original issue discount, underwriting discounts and deferred financing costs.

Interest on the senior notes is payable semi-annually in arrears as set forth below (dollars in thousands).

Title of the Notes	Principal Amount		Interest Amount		Payment Dates	Commencement Date
0.950% Senior Notes due October 2024	$	500,000	$	2,375	April 1 and October 1	April 1, 2022
2.900% Senior Notes due October 2030	$	1,000,000	$	14,500	April 1 and October 1	April 1, 2021
2.350% Senior Notes due January 2032	$	500,000	$	5,875	January 15 and July 15	July 15, 2022
3.050% Senior Notes due October 2041	$	500,000	$	7,625	April 1 and October 1	April 1, 2022

The terms of the senior notes are further described in Notes 6 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report and in the indenture and supplemental indentures governing the senior notes.

Senior Credit Facility

On October 8, 2021, we entered into the Amended Credit Agreement that, among other things, (i) provided for a new $750.0 million term loan facility for the purpose of financing the acquisition of Blattner pursuant to the agreement and plan of merger, (ii) increased the aggregate revolving commitments of the lenders from $2.51 billion to $2.64 billion and (iii) extended the maturity date for revolving commitments under the senior credit facility from September 22, 2025 to October 8, 2026, which is also the maturity date for the new term loan facility. After giving effect to the amendment, the aggregate amount of the credit facilities provided for under the amended credit agreement is $3.39 billion. On October 13, 2021, we borrowed the full amount of the $750.0 million term loan facility and used such amount, together with the net proceeds from the September 2021 offering of the 2024 notes, the 2032 notes and the 2041 notes and approximately $50.9 million of revolving loans borrowed under the senior credit facility, to pay the cash consideration for the acquisition of Blattner. We are required to make quarterly

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principal payments on the first business day of each January, April, July and October, beginning in January 2023, on outstanding borrowings under the new term loan facility in an amount equal to $4.7 million per quarter in 2023 and 2024, $9.4 million per quarter in 2025 and $18.8 million per quarter in 2026.

As of November 1, 2021, we had $1.39 billion of outstanding borrowings under our senior credit facility, composed of $640.0 million of outstanding revolving loans and $750.0 million outstanding under the new term loan facility. Also as of November 1, 2021, subject to the applicable sublimits and the other terms and conditions of the Amended Credit Agreement, the remaining $1.66 billion of available commitments under the senior credit facility was available for loans or issuing new letters of credit in U.S. dollars and certain alternative currencies. Subject to the conditions and limitations specified in the Amended Credit Agreement, we have the option to increase the capacity of the credit facility.

Borrowings of revolving loans under our senior credit facility are to be used to refinance existing indebtedness and for working capital, capital expenditures, acquisitions and other general corporate purposes. The Amended Credit Agreement for our senior credit facility contains certain covenants, including, as of the end of any fiscal quarter for us, (i) a maximum Consolidated Leverage Ratio (as defined in the Amended Credit Agreement) of 3.5 to 1.0 (except that in connection with certain permitted acquisitions in excess of $200.0 million, including our acquisition of Blattner, such ratio is 4.0 to 1.0 for the fiscal quarter in which the acquisition is completed and the four subsequent fiscal quarters) and (ii) a minimum Consolidated Interest Coverage Ratio (as defined in the Amended Credit Agreement) of 3.0 to 1.0. For purposes of calculating the Consolidated Leverage Ratio, total funded debt is reduced by available cash and Cash Equivalents (as defined in the Amended Credit Agreement) in excess of $25.0 million. As of September 30, 2021, we were in compliance with all of the financial covenants under the Amended Credit Agreement, and subsequent to our acquisition of Blattner, our Consolidated Leverage Ratio increased but remained significantly below such financial covenants.

To address the transition in financial markets away from the London Interbank Offered Rate (LIBOR), our Amended Credit Agreement includes customary LIBOR benchmark replacement provisions. The benchmark replacement for U.S. dollar-denominated loans may be a rate based on the secured overnight financing rate published by the Federal Reserve Bank of New York or an alternate benchmark, subject to the terms and conditions set forth in the amended credit agreement. In certain circumstances, loans in U.S. dollars would default to the Base Rate, which under such circumstances would equal the highest of (i) the Federal Funds Rate (as defined in the amended credit agreement) plus 0.5% and (ii) the prime rate publicly announced by Bank of America, N.A. Changing to an alternative interest rate or to the Base Rate may lead to additional volatility in interest rates and could cause our debt service obligations to increase significantly.

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Contractual Obligations and Contingencies

The following table summarizes our future contractual obligations as of September 30, 2021, excluding certain amounts discussed below (in thousands):

	Total		Remainder of 2021		2022		2023		2024		2025		Thereafter
Long-term debt - principal (1)	$	2,956,070	$	2,360	$	9,401	$	9,017	$	507,574	$	421,510	$	2,006,208
Long-term debt - cash interest (2)	722,308		15,037		57,022		62,819		62,593		57,843		466,994
Short-term debt (3)	13,471		13,471		—		—		—		—		—
Operating lease obligations (3)	260,531		23,964		80,516		58,265		36,341		24,449		36,996
Operating lease obligations that have not yet commenced (4)	6,984		88		1,152		1,228		1,243		1,079		2,194
Finance lease obligations (5)	2,369		296		872		666		409		126		—
Short-term lease obligations (6)	18,682		9,803		8,879		—		—		—		—
Deferral of tax payments (7)	108,870		54,435		54,435		—		—		—		—
Equipment purchase commitments (8)	165,341		58,451		106,890		—		—		—		—
Total contractual obligations	$	4,254,626	$	177,905	$	319,167	$	131,995	$	608,160	$	505,007	$	2,512,392

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(1)    Amount represents the principal amount of our long-term debt. The cash interest obligations related to the fixed-rate portion of our long-term debt are included in Long-term debt - cash interest; however, our $415.9 million of outstanding revolving loans under our senior credit facility bear interest at variable market rates. Assuming the principal amount outstanding and interest rate in effect for the revolving loans at September 30, 2021 remained the same, the annual cash interest expense for such loans would be approximately $10.2 million, payable until October 8, 2026, the maturity date of the facility. See Liquidity and Capital Resource - Debt Instruments - Senior Credit Facility above for further information related to borrowings under the credit facility subsequent to September 30, 2021 associated with financing the cash portion of consideration related to the acquisition of Blattner. Amounts borrowed subsequent to September 30, 2021 are not included in this table.

(2)    Amount represents cash interest expense associated with our fixed-rate, long-term debt, which primarily includes our senior notes and financing transactions arising from the exercise of our equipment rental purchase options.

(3)    Amounts represent undiscounted operating lease obligations at September 30, 2021 for our real estate and equipment leases. The operating lease obligations recorded on our September 30, 2021 condensed consolidated balance sheet represent the present value of these amounts.

(4)    Amounts represent undiscounted operating lease obligations that have not commenced as of September 30, 2021. The operating lease obligations will be recorded on our condensed consolidated balance sheet beginning on the commencement date of each lease.

(5)    Amounts represent undiscounted finance lease obligations at September 30, 2021. The finance lease obligations recorded on our September 30, 2021 condensed consolidated balance sheet represent the present value of these amounts.

(6)    Amounts represent short-term lease obligations that are not recorded on our September 30, 2021 condensed consolidated balance sheet due to our accounting policy election. Month-to-month rental expense associated primarily with certain equipment rentals is excluded from these amounts because we are unable to accurately predict future rental amounts.

(7)    Amounts represent deferral of $108.9 million related to the employer portion of payroll tax payments during the year ended December 31, 2020, which was permitted pursuant to the CARES Act. Payment of these deferred tax obligations are due by December 31, 2021 and December 31, 2022.

(8)    Amount represents capital committed for the expansion of our vehicle fleet. Although we have committed to the purchase of these vehicles at the time of their delivery, we expect that these orders will be assigned to third-party leasing companies and made available to us under certain of our master equipment lease agreements.

We have various contingencies and commitments that may require the use of cash in future periods, including those set forth below. The Contractual Obligations table excludes the contingencies described below, as we are unable to accurately predict the timing and amount of any of the following contingent obligations.

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Uncollectible accounts receivable - We grant credit under normal payment terms, generally without collateral, to our customers. While we generally have certain statutory lien rights with respect to services provided, we are subject to potential credit risk related to business, economic and financial market conditions that affect these customers and locations, which has been heightened as a result of the unfavorable and uncertain economic and financial market conditions resulting from the ongoing COVID-19 pandemic and the currently challenged energy market. Some of our customers have experienced significant financial difficulties (including bankruptcy), and customers may experience financial difficulties in the future. These difficulties expose us to increased risk related to collectability of billed and unbilled receivables and contract assets for services we have performed. For example, certain customers within our Underground Utility and Infrastructure segment have experienced operational and/or financial difficulties. For additional information on these matters, see Concentration of Credit Risk in Note 10 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report.

Lawsuits and other legal proceedings - We are from time to time party to various lawsuits, claims and other legal proceedings that arise in the ordinary course of business, which typically seek, among other things, compensation for alleged personal injury, property damage, breach of contract, negligence or gross negligence, environmental liabilities, wage and hour and other employment-related damages, punitive damages, consequential damages, civil penalties or other losses, or injunctive or declaratory relief. With respect to all such lawsuits, claims and proceedings, we record a reserve when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. In addition, we disclose matters for which management believes a material loss is at least reasonably possible. See Note 10 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report for additional information regarding litigation, claims and other legal proceedings.

Collective bargaining agreements and multiemployer pension plan liabilities - Certain of our operating units are parties to collective bargaining agreements with unions that represent certain of their employees, and from time to time, we are a party to grievance and arbitration actions based on claims arising out of the collective bargaining agreements, which specify that we pay certain wages, provide certain benefits to union employees and contribute certain amounts to multiemployer pension plans and employee benefit trusts. The location and number of union employees that we employ at any given time and the plans in which they may participate vary depending on our need for union resources in connection with our ongoing projects, and therefore we are unable to accurately predict our union employee payroll and the resulting contribution obligations for future periods. Furthermore, we may be required to make additional contributions to our multiemployer pension plans if they become underfunded or if we withdraw or are deemed to have withdrawn from a plan or a plan is terminated or experiences a mass withdrawal. For additional information on these obligations and potential contingencies, see Collective Bargaining Agreements and Multiemployer Pension Plans in Note 10 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report.

Bonds and parent guarantees - Many customers, particularly in connection with new construction, require us to post performance and payment bonds, which provide a guarantee that we will perform under the terms of a contract and pay subcontractors and vendors. In certain circumstances, the customer may demand that our surety make payments or provide services under the bond, and we must reimburse the surety for any expenses or outlays it incurs. As of September 30, 2021 the total amount of our outstanding performance bonds was estimated to be approximately $3.8 billion. Additionally, from time to time, we guarantee certain obligations and liabilities of our subsidiaries that may arise in connection with, among other things, contracts with customers, equipment lease obligations, joint venture arrangements and contractor licenses, and may cover all of the subsidiary’s unperformed, undischarged and unreleased obligations and liabilities under or in connection with the relevant agreement. For additional information on these obligations and potential contingencies, see Bonds and Parent Guarantees in Note 10 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report.

Insurance liabilities - Due to the nature of our operations, at any given time we have a significant amount of accrued insurance claims. As of September 30, 2021 and December 31, 2020, the gross amount accrued for employer’s liability, workers’ compensation, auto liability, general liability, and group health claims totaled $316.8 million and $319.5 million. Additionally, we renew our insurance policies on an annual basis, and therefore deductibles and levels of insurance coverage may change in future periods. In addition, insurers may cancel our coverage or determine to exclude certain items from coverage, or we may elect not to obtain certain types or incremental levels of insurance based on the potential benefits considered relative to the cost of such insurance, or coverage may not be available at reasonable and competitive rates. See Insurance in Note 10 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report.

Indemnities and assumed liabilities - In connection with our acquisition transactions, we assume certain liabilities and obtain rights to indemnification from the sellers or former owners of acquired businesses for certain risks, liabilities and

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obligations arising from their prior operations, such as performance, operational, safety, workforce or tax issues. However, we may not have discovered certain liabilities during due diligence and our indemnities may not cover all of our exposure for such pre-acquisition matters or the indemnitors may be unwilling or unable to pay amounts owed to us. Accordingly, we may incur expenses that are not reimbursed, and such amounts could be material. See Indemnities in Note 10 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report for further discussion related to these potential contingencies.

Liabilities related to our deferred compensation plans - We maintain non-qualified deferred compensation plans pursuant to which non-employee directors and certain key employees may defer receipt of some or all of their compensation. As of September 30, 2021 and December 31, 2020, obligations under these plans, including amounts contributed by us, were $69.1 million and $58.2 million. These plans are unfunded and unsecured compensation arrangements, and the amount of the obligations can fluctuate based on the market value of participants’ investment elections under the plan. See Deferred Compensation Plans in Note 10 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report for further discussion related to these plans.

Undistributed earnings of foreign subsidiaries - We generally do not provide for taxes related to undistributed earnings of our foreign subsidiaries and we could be subject to additional foreign withholding taxes if we were to repatriate cash that is indefinitely reinvested outside the United States. However, we do not expect such amount to be material.

Unrecognized tax benefits and valuation allowance on deferred tax assets - As of September 30, 2021, the total amount of unrecognized tax benefits relating to uncertain tax positions was $40.6 million. Our consolidated federal income tax return for the tax year 2019 is currently under examination by the IRS, and our consolidated federal income tax returns for tax years 2017, 2018, and 2020 remain open to examination by the IRS, as these statute of limitations periods have not yet expired, and various state and foreign tax returns filed by us and our subsidiaries for multiple periods remain under examination by various U.S. state, Canadian and other foreign tax authorities. We believe it is reasonably possible that within the next 12 months unrecognized tax benefits may decrease by up to $13.3 million as a result of settlement of these examinations or as a result of the expiration of certain statute of limitations periods. Additionally, we regularly evaluate valuation allowances established for deferred tax assets for which future realization is uncertain, including in connection with changes in tax laws, and we may not realize deferred tax assets to the extent estimated. See Income Taxes in Note 2 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report for further discussion related to these potential contingencies.

Commitment fees under our senior credit facility - Fees associated with letters of credit under our senior credit facility and commitment fees under our senior credit facility are variable because they depend on the amount of outstanding letters of credit, availability and applicable fees. Assuming that the amount of letters of credit outstanding and the fees as of September 30, 2021 remained the same, the annual cash expense for our letters of credit would be approximately $4.0 million. See Notes 6 and 10 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report for further discussion related to these obligations and potential contingencies.

Residual Value Guarantees - We have guaranteed the residual value under certain of our equipment operating leases, agreeing to pay any difference between this residual value and the fair market value of the underlying asset at the date of lease termination. Due to the nature of our operations, at any given time we have a significant amount of outstanding residual value guarantees, and as of September 30, 2021 the maximum guaranteed residual value of this equipment was $886.9 million. While we believe that no significant payments will be made as a result of these residual value guarantees, there can be no assurance that significant payments will not be required in the future.

Investment commitment - As of September 30, 2021, we had committed to contribute $13.6 million for certain investments, but the timing of the contributions has not yet been determined.

Off-Balance Sheet Arrangements

As is common in our industry, we have entered into certain off-balance sheet arrangements in the ordinary course of business that result in risks not directly reflected in our balance sheets. Our significant off-balance sheet transactions include certain obligations relating to our investments and joint venture arrangements; short-term, non-cancelable leases and leases that have not yet commenced; letters of credit obligations; surety guarantees related to bonds; committed expenditures for the purchase of equipment; and certain multiemployer pension plan liabilities. See Contractual Obligations and Contingencies above and Note 10 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report for a description of these arrangements.

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Critical Accounting Estimates and Policies Update

The discussion and analysis of our financial condition and results of operations are based on our condensed consolidated financial statements, which have been prepared in accordance with the rules of the SEC. Certain information and footnote disclosures normally included in annual financial statements, which are prepared in accordance with GAAP, have been condensed or omitted pursuant to those rules and regulations. The preparation of these condensed consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities known to exist as of the date the condensed consolidated financial statements are published and the reported amounts of revenues and expenses recognized during the periods presented. We review all significant estimates affecting our condensed consolidated financial statements on a recurring basis and record the effect of any necessary adjustments prior to their publication. Judgments and estimates are based on our beliefs and assumptions derived from information available at the time such judgments and estimates are made. Uncertainties with respect to such estimates and assumptions are inherent in the preparation of financial statements. There can be no assurance that actual results will not differ from those estimates. Management has reviewed its development and selection of critical accounting estimates with the audit committee of our Board of Directors. Our accounting policies are primarily described in Note 2 of the Notes to Consolidated Financial Statements in Item 8. Financial Statements and Supplementary Data of Part II of our 2020 Annual Report and, to a lesser extent, in Note 2 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report and should be read in conjunction with our critical accounting estimates detailed in Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations of Part II of our 2020 Annual Report.

Item 3.Quantitative and Qualitative Disclosures about Market Risk.

The information in this section should be read in connection with the information on financial market risk related to changes in interest rates and currency exchange rates in Item 7A. Quantitative and Qualitative Disclosures About Market Risk of Part II of our 2020 Annual Report. Our primary exposure to market risk relates to unfavorable changes in concentration of credit risk, interest rates and currency exchange rates.

Credit Risk. We are subject to concentrations of credit risk related to our cash and cash equivalents and net receivable position with customers, which includes amounts related to billed and unbilled accounts receivable and contract assets net of advanced billings with the same customer. Substantially all of our cash and cash equivalents are managed by what we believe to be high credit quality financial institutions. In accordance with our investment policies, these institutions are authorized to invest cash and cash equivalents in a diversified portfolio of what we believe to be high-quality investments, which primarily include interest-bearing demand deposits, money market investments and money market mutual funds. Although we do not currently believe the principal amounts of these cash and cash equivalents are subject to any material risk of loss, changes in economic conditions could impact the interest income we receive from these investments.

In addition, we grant credit under normal payment terms, generally without collateral, and therefore are subject to potential credit risk related to our customers’ inability to pay for services provided. Furthermore, the risk of nonpayment may be heightened as a result of depressed economic and financial market conditions, including in connection with the ongoing COVID-19 pandemic and the currently challenged energy market. We believe the concentration of credit risk related to billed and unbilled receivables and contract assets is limited because of the diversity of our customers, and we perform ongoing credit risk assessments of our customers and financial institutions and in some cases obtain collateral or other security from our customers. For example, certain customers within our Underground Utility and Infrastructure Solutions segment have encountered operational and/or financial difficulties. For additional information regarding these matters, see Revenue Recognition - Current and Long-Term Accounts Receivable and Allowance for Credit Losses in Note 2 and Concentrations of Credit Risk in Note 10 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report.

Interest Rate Risk. As of September 30, 2021, we had no derivative financial instruments to manage interest rate risk. As such, we were exposed to earnings and fair value risk due to changes in interest rates with respect to our variable rate debt, which is comprised of borrowings under the credit agreement for our senior credit facility. As of September 30, 2021, the fair value of our variable rate debt of $415.9 million approximated book value, and our weighted average interest rate on our variable rate debt for the three months ended September 30, 2021 was 2.13%. The annual effect on our pretax earnings of a hypothetical 50 basis point increase or decrease in variable interest rates would be approximately $2.1 million based on our September 30, 2021 balance of variable rate debt.

Additionally, the transition in financial markets away from the LIBOR beginning in 2021 may lead to additional volatility in interest rates and could cause our debt service obligations to increase significantly as further described in Liquidity and Capital Resources - Debt Instruments in Item 2. Management’s Discussion and Analysis of Part I of this Quarterly Report.

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Foreign Currency Risk. The U.S. dollar is the functional currency for the majority of our operations, which are primarily located within the United States. The functional currency for our foreign operations, which are primarily located in Canada and Australia, is typically the currency of the country in which the foreign operating unit is located. Accordingly, our financial performance is subject to fluctuation due to changes in foreign currency exchange rates relative to the U.S. dollar. During the three and nine months ended September 30, 2021, revenues from our foreign operations accounted for 13.7% and 15.3% of our consolidated revenues. Fluctuations in foreign currency exchange rates during the three and nine months ended September 30, 2021 caused a net increase of approximately $21 million and $99 million related to foreign revenues when compared to the three and nine months ended September 30, 2020.

We are also subject to foreign currency risk with respect to sales, purchases and borrowings that are denominated in a currency other than the respective functional currencies of our operating units. To minimize the risk from changes in foreign currency exchange rates, we may enter into foreign currency derivative contracts to hedge our foreign currency risk on a cash flow basis. We had no outstanding foreign currency derivative contracts at September 30, 2021.

We also have foreign exchange risk related to cash and cash equivalents in foreign banks. Based on the balance of cash and cash equivalents in foreign banks of $31.2 million as of September 30, 2021, an assumed 5% adverse change to foreign exchange rates would result in a fair value decline of $1.2 million.

Item 4.Controls and Procedures.

Attached as exhibits to this Quarterly Report on Form 10-Q are certifications of Quanta’s Chief Executive Officer and Chief Financial Officer that are required in accordance with Rule 13a-14 of the Securities Exchange Act of 1934, as amended (the Exchange Act). This item includes information concerning the controls and controls evaluation referred to in the certifications, and it should be read in conjunction with the certifications for a more complete understanding of the topics presented.

Evaluation of Disclosure Controls and Procedures

Our management has established and maintains a system of disclosure controls and procedures that are designed to provide reasonable assurance that information required to be disclosed by us in the reports that we file or submit under the Exchange Act, such as this Quarterly Report, is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms. The disclosure controls and procedures are also designed to provide reasonable assurance that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

As of the end of the period covered by this Quarterly Report, we evaluated the effectiveness of the design and operation of our disclosure controls and procedures pursuant to Rule 13a-15(b) of the Exchange Act, as such disclosure controls and procedures are defined in Rule 13a-15(e) and 15d-15(e) of the Exchange Act. This evaluation was carried out under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer. Based on this evaluation, these officers have concluded that, as of September 30, 2021, our disclosure controls and procedures were effective to provide reasonable assurance of achieving their objectives.

Evaluation of Internal Control over Financial Reporting

No change in our internal control over financial reporting occurred during the quarter ended September 30, 2021 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Design and Operation of Control Systems

Our management, including the Chief Executive Officer and Chief Financial Officer, does not expect that our disclosure controls and procedures or our internal control over financial reporting will prevent or detect all errors and all fraud. A control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that the control system’s objectives will be met. The design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Further, because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that misstatements due to error or fraud will not occur or that all control issues and instances of fraud, if any, within the company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty and breakdowns can occur because of simple errors or mistakes. Controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the controls. The design of any system of controls is based in part on certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. Over time, controls may become inadequate because of changes in conditions or deterioration in the degree of

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compliance with policies or procedures.

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PART II — OTHER INFORMATION

Item 1.  Legal Proceedings.

We are from time to time party to various lawsuits, claims and other legal proceedings that arise in the ordinary course of business. These actions typically seek, among other things, compensation for alleged personal injury, property damage, breach of contract, negligence or gross negligence, environmental liabilities, wage and hour claims and other employment-related damages, punitive damages, consequential damages, civil penalties or other losses, or injunctive or declaratory relief. With respect to all such lawsuits, claims and proceedings, we record a reserve when it is probable that a loss has been incurred and the amount of loss can be reasonably estimated. In addition, we disclose matters for which management believes a material loss is at least reasonably possible. See Note 10 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report, which is incorporated by reference in this Item 1, for additional information regarding litigation, claims and other legal proceedings.

Item 1A.  Risk Factors.

Our business is subject to a variety of risks and uncertainties that are difficult to predict and many of which are outside of our control. For a detailed discussion of the risks that affect our business, refer to Item 1A. Risk Factors of Part I of our 2020 Annual Report. As of the date of this filing, there have been no material changes to the risk factors previously described in our 2020 Annual Report, except as set forth below with respect to our acquisition of Blattner and except that the potential effects of the acquisition of Blattner, and the financing thereof, may also have the effect of heightening certain other risks described in our 2020 Annual Report. The matters specifically identified are not the only risks and uncertainties facing our company, and additional risks and uncertainties not known to us or not specifically identified may also impair our business. If any of these risks and uncertainties occur, our business, financial condition, results of operations and cash flows could be negatively impacted, which could negatively impact the value of an investment in our company.

We may not realize the anticipated benefits and synergies from our acquisition of Blattner.

The success of our acquisition of Blattner will depend, in part, on our ability to realize the anticipated benefits from successfully integrating Blattner’s business. We plan on devoting substantial management attention and resources to integrating our and Blattner’s business practices and operations so that we can fully realize the anticipated benefits of the acquisition. Nonetheless, the business and assets acquired may not be successful, achieve the anticipated financial results or continue to grow at the same rate as when operated independently or may require greater resources and investments than originally anticipated. The acquisition of Blattner could also result in the assumption of unknown or contingent liabilities. Potential difficulties we may encounter in the integration process include the following:

•the inability to successfully integrate Blattner’s business in a manner that permits us to achieve the strategic operational benefits, additional opportunities with customers, reputational benefits or cost savings anticipated to result from the acquisition, which would result in some anticipated benefits of the acquisition not being realized in the time frame currently anticipated, or at all;

•the failure to integrate operations and internal systems, programs and controls;

•the inability to successfully realize the anticipated value from some of Blattner’s assets;

•lost revenues and lost or damaged commercial relationships;

•the complexities and difficulties associated with our decentralized management structure;

•the additional complexities of integrating a business with a different customer base, markets, history, culture and strategy;

•the failure to retain key employees of either of the two companies that may be difficult to replace;

•the disruption of our ongoing businesses or inconsistencies in our services, standards, controls, procedures and policies;

•potential unknown, unforeseen or greater than expected liabilities and expenses associated with the acquired business;

•changes in estimates related to revenues and costs associated with Blattner's ongoing contracts with customers; and

•performance shortfalls as a result of the diversion of management’s attention caused by integrating Blattner’s operations.

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In addition, laws and regulations related to renewable energy could adversely impact our business, financial condition, results of operations and growth prospects of Blattner, including, among other things, changes to legislation and regulation that mandate percentages of power to be generated from renewable sources, require utilities to meet reliability standards, and encourage installation of new electric power transmission and renewable energy generation facilities. Furthermore, supply chain and other logistical difficulties, as well as sourcing restrictions on materials necessary for certain renewable energy projects, could negatively impact renewable energy customers and delay or jeopardize the viability of certain renewable energy projects in the future. For example, delays in the transportation of materials for renewable projects (e.g., solar panels) from ports to project sites, as well as sourcing restrictions on certain solar project materials produced in China, could increase the pricing of such materials, and negatively impact Blattner’s customers and certain solar infrastructure projects in the near term. Any of these risks could adversely affect our ability to fully realize the anticipated benefits of our acquisition of Blattner within the expected timeframe or at all or such benefits may take longer to realize or cost more than expected, which could adversely affect our business, financial condition, results of operations and growth prospects.

We have incurred, and expect to continue to incur, substantial expenses related to our acquisition of Blattner.

We have incurred, and expect to continue to incur, substantial expenses in connection with the acquisition of Blattner and integrating the business, operations, practices, policies and procedures of Blattner. While we assumed that a certain level of transaction and integration expenses would be incurred, there are a number of factors beyond our and Blattner’s control that could affect the total amount or the timing of their integration expenses. Many of the expenses that will be incurred, by their nature, are difficult to estimate accurately at the present time. The overall expenses in connection with the acquisition are expected to be significant, although the aggregate amount and timing of such charges are uncertain at present.

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Item 2.Unregistered Sales of Equity Securities and Use of Proceeds.

Unregistered Sales of Equity Securities

On July 30, 2021, we completed an acquisition in which a portion of the consideration consisted of the unregistered issuance of shares of our common stock. The aggregate consideration paid at closing in the acquisition included 32,822 shares of our common stock, which had a fair value of $2.5 million as of the acquisition date. Additionally, subsequent to September 30, 2021, we completed two acquisitions, on October 1, 2021 and October 13, 2021, in which a portion of the consideration for each acquisition consisted of the unregistered issuance of shares of our common stock. The aggregate consideration paid at closing in these acquisitions included 3,369,703 shares of our common stock.

For additional information about these acquisitions, see Note 4 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report. The issuance of shares of our common stock in connection with these acquisitions were not registered under the Securities Act in reliance upon the exemption from registration provided by Section 4(a)(2) of the Securities Act, which exempts transactions by an issuer not involving any public offering, and Rule 506 of Regulation D promulgated by the SEC under that section. These securities may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirement.

Issuer Purchases of Equity Securities During the Third Quarter of 2021

The following table contains information about our purchases of equity securities during the three months ended September 30, 2021.

Period	Total Number of Shares Purchased (1)(2)	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (1)	Maximum Number (or Approximate Dollar Value) of Shares that may yet be Purchased Under the Plans or Programs (1)
July 1 - 31, 2021
Open Market Stock Repurchases (1)	110,306	$	88.99	110,306	$	479,831,599
Tax Withholding Obligations (2)	15,190	$	88.78	—
August 1 - 31, 2021
Open Market Stock Repurchases (1)	74,452	$	94.18	74,452	$	472,819,735
Tax Withholding Obligations (2)	10,754	$	98.66	—
September 1 - 30, 2021
Open Market Stock Repurchases (1)	—	$	—	—	$	472,819,735
Tax Withholding Obligations (2)	1,764	$	118.44	—
Total	212,466			184,758	$	472,819,735

_______________________________________

(1)Includes shares repurchased as of the trade date of such repurchases. On August 6, 2020, we issued a press release announcing that our Board of Directors approved a stock repurchase program that authorizes us to purchase, from time to time through June 30, 2023, up to $500 million of our outstanding common stock. Repurchases under this program can be made in open market and privately negotiated transactions, at our discretion, based on market and business conditions, applicable contractual and legal requirements and other factors. The program does not obligate us to acquire any specific amount of common stock and may be modified or terminated by our Board of Directors at any time at its sole discretion and without notice.

(2)Includes shares purchased from employees to satisfy tax withholding obligations in connection with the vesting of restricted stock unit and performance stock unit awards or the settlement of previously vested but deferred restricted stock unit and performance stock unit awards.

Item 3. Defaults Upon Senior Securities.

None.

Item 4. Mine Safety Disclosures.

Not applicable.

72

Item 5. Other Information.

None.

73

Item 6.Exhibits.

Exhibit No.		Description
2.1		Agreement and Plan of Merger by and among Blattner Holding Company, Quanta Services, Inc., Quanta Merger Sub, LLC and certain shareholders of Blattner Holding Company, dated as of September 1, 2021 (previously filed as Exhibit 2.1 to the Company’s Form 8-K filed October 15, 2021 and incorporated herein by reference)
3.1		Restated Certificate of Incorporation of Quanta Services, Inc. (previously filed as Exhibit 3.1 to the Company’s Form 8-K filed March 26, 2019 and incorporated herein by reference)
3.2		Bylaws of Quanta Services, Inc., as amended and restated December 6, 2018 (previously filed as Exhibit 3.1 to the Company’s Form 8-K filed December 11, 2018 and incorporated herein by reference)
4.1		Indenture, dated as of September 22, 2020, between Quanta Services, Inc. and U.S. Bank National Association, as trustee (previously filed as Exhibit 4.1 to the Company’s Form 8-K filed September 25, 2020 and incorporated herein by reference)
4.2		Second Supplemental Indenture, dated as of September 23, 2021, between Quanta Services, Inc. and U.S. Bank National Association, as trustee (previously filed as Exhibit 4.2 to the Company’s Form 8-K filed September 23, 2021 and incorporated herein by reference)
4.3		Third Supplemental Indenture, dated as of September 23, 2021, between Quanta Services, Inc. and U.S. Bank National Association, as trustee (previously filed as Exhibit 4.3 to the Company’s Form 8-K filed September 23, 2021 and incorporated herein by reference)
4.4		Fourth Supplemental Indenture, dated as of September 23, 2021, between Quanta Services, Inc. and U.S. Bank National Association, as trustee (previously filed as Exhibit 4.4 to the Company’s Form 8-K filed September 23, 2021 and incorporated herein by reference)
4.5		Form of 0.095% Senior Notes due 2024 (previously filed as Exhibit 4.5 to the Company’s Form 8-K filed September 23, 2021 and incorporated herein by reference)
4.6		Form of 2.350% Senior Notes due 2032 (previously filed as Exhibit 4.6 to the Company’s Form 8-K filed September 23, 2021 and incorporated herein by reference)
4.7		Form of 3.050% Senior Notes due 2041 (previously filed as Exhibit 4.7 to the Company’s Form 8-K filed September 23, 2021 and incorporated herein by reference)
10.1		Commitment Letter, dated as of September 1, 2021, by and among BofA Securities, Inc., Bank of America, N.A., Wells Fargo Securities, LLC, and Wells Fargo Bank, National Association, as the commitment parties, and Quanta Services, Inc., as borrower (previously filed as Exhibit 10.3 to the Company’s Form 8-K filed October 15, 2021 and incorporated herein by reference)
10.2		Eighth Amendment to Fourth Amended and Restated Credit Agreement, dated as of September 9, 2021, among Quanta Services, Inc. and certain subsidiaries of Quanta Services, Inc., as Borrowers, Quanta Services, Inc., as Guarantor, the lenders party thereto, Bank of America, N.A., as Administrative Agent, and the Swing Line Lenders and L/C Issuers party thereto (previously filed as Exhibit 10.1 to the Company’s Form 8-K filed October 15, 2021 and incorporated herein by reference)
10.3		Ninth Amendment to Fourth Amended and Restated Credit Agreement, dated as of October 8, 2021, among Quanta Services, Inc. and certain subsidiaries of Quanta Services, Inc., as Borrowers, Quanta Services, Inc., as Guarantor, the lenders party thereto, Bank of America, N.A., as Administrative Agent, and the Swing Line Lenders and L/C Issuers party thereto (previously filed as Exhibit 10.2 to the Company’s Form 8-K filed October 15, 2021 and incorporated herein by reference)
31.1	*	Certification by Chief Executive Officer pursuant to Rule 13a-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith)
31.2	*	Certification by Chief Financial Officer pursuant to Rule 13a -14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith)
32.1	*	Certification by Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith)
101	*	The following financial statements from the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2021, formatted in Inline XBRL: (i) Condensed Consolidated Balance Sheets, (ii) Condensed Consolidated Statements of Operations, (iii) Condensed Consolidated Statements of Comprehensive Income, (iv) Condensed Consolidated Statements of Cash Flows, (v) Condensed Consolidated Statements of Equity and (vi) Notes to Condensed Consolidated Financial Statements, tagged as blocks of text and with detailed tags
104	*	The cover page from the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2021, formatted in Inline XBRL (included as Exhibit 101)

_______________________________________

* Filed or furnished herewith

74

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant, Quanta Services, Inc., has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

QUANTA SERVICES, INC.

By:	/s/  PAUL M. NOBEL
	Paul M. Nobel Vice President and Chief Accounting Officer
	(Principal Accounting Officer)

Dated: November 4, 2021

75

EX-31.1

Exhibit 31.1

I, Earl C. Austin, Jr., certify that:

1. I have reviewed this quarterly report on Form 10-Q of Quanta Services, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: November 4, 2021	By:	/s/ EARL C. AUSTIN, JR.
		Earl C. Austin, Jr.
		President, Chief Executive Officer and Chief Operating Officer
		(Principal Executive Officer)

EX-31.2

Exhibit 31.2

I, Derrick A. Jensen, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Quanta Services, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: November 4, 2021	By:	/s/ DERRICK A. JENSEN
		Derrick A. Jensen
		Chief Financial Officer
		(Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Each of the undersigned officers of Quanta Services, Inc. (the “Company”) hereby certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to such officer’s knowledge that:

(1) the accompanying quarterly report on Form 10-Q for the period ending September 30, 2021 as filed with the U.S. Securities and Exchange Commission (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: November 4, 2021

/s/ EARL C. AUSTIN, JR.  

Earl C. Austin, Jr.

President, Chief Executive Officer and Chief Operating Officer

Dated: November 4, 2021

/s/ DERRICK A. JENSEN  

Derrick A. Jensen 

Chief Financial Officer 

XML

Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Nov. 02, 2021
Document And Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-13831
Entity Registrant Name	Quanta Services, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	74-2851603
Entity Address, Address Line One	2800 Post Oak Boulevard, Suite 2600
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77056
City Area Code	713
Local Phone Number	629-7600
Title of 12(b) Security	Common Stock, $0.00001 par value
Trading Symbol	PWR
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		142,499,280
Document Fiscal Period Focus	Q3
Amendment Flag	false
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001050915

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 1,696,210	$ 184,620
Accounts receivable, net of allowances of $39,709 and $16,546	3,002,172	2,716,083
Contract assets	760,279	453,832
Inventories	61,959	50,472
Prepaid expenses and other current assets	183,514	183,382
Total current assets	5,704,134	3,588,389
Property and equipment, net of accumulated depreciation of $1,481,416 and $1,372,132	1,601,500	1,560,656
Operating lease right-of-use assets	232,282	256,845
Other assets, net	602,838	435,713
Other intangible assets, net of accumulated amortization of $582,126 and $517,574	388,999	435,655
Goodwill	2,145,963	2,121,014
Total assets	10,675,716	8,398,272
Current Liabilities:
Current maturities of long-term debt and short-term debt	23,748	14,764
Current portion of operating lease liabilities	78,869	85,134
Accounts payable and accrued expenses	1,760,789	1,509,794
Contract liabilities	501,142	528,864
Total current liabilities	2,364,548	2,138,556
Long-term debt, net of current maturities	2,930,905	1,174,294
Operating lease liabilities, net of current portion	161,320	178,822
Deferred income taxes	184,827	166,407
Insurance and other non-current liabilities	400,284	391,221
Total liabilities	6,041,884	4,049,300
Commitments and Contingencies
Equity:
Common stock, $0.00001 par value, 600,000,000 shares authorized, 165,007,258 and 162,710,792 shares issued, and 139,111,888 and 138,300,191 shares outstanding	2	2
Additional paid-in capital	2,232,319	2,170,026
Retained earnings	3,620,409	3,264,967
Accumulated other comprehensive loss	(242,986)	(232,997)
Treasury stock, 25,895,370 and 24,410,601 common shares	(979,034)	(857,817)
Total stockholders’ equity	4,630,710	4,344,181
Non-controlling interests	3,122	4,791
Total equity	4,633,832	4,348,972
Total liabilities and equity	$ 10,675,716	$ 8,398,272

XML

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Allowances on accounts receivable, current	$ 39,709	$ 16,546
Accumulated depreciation on property and equipment	1,481,416	1,372,132
Accumulated amortization on other intangible assets	$ 582,126	$ 517,574
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	600,000,000	600,000,000
Common stock, shares issued (in shares)	165,007,258	162,710,792
Common stock, shares outstanding (in shares)	139,111,888	138,300,191
Treasury stock, common shares (in shares)	25,895,370	24,410,601

XML

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenues	$ 3,353,278	$ 3,020,161	$ 9,056,675	$ 8,290,487
Cost of services (including depreciation)	2,818,602	2,512,647	7,701,398	7,095,513
Gross profit	534,676	507,514	1,355,277	1,194,974
Equity in earnings of integral unconsolidated affiliates	10,232	5,120	22,865	6,165
Selling, general and administrative expenses	(274,846)	(250,654)	(788,308)	(709,299)
Amortization of intangible assets	(22,772)	(19,687)	(65,418)	(55,374)
Asset impairment charges	0	0	(2,319)	0
Change in fair value of contingent consideration liabilities	787	(78)	1,360	(598)
Operating income	248,077	242,215	523,457	435,868
Interest expense	(17,259)	(11,049)	(42,843)	(33,709)
Interest income	72	80	3,098	1,114
Other income (expense), net	6,089	2,931	18,232	(3,649)
Income before income taxes	236,979	234,177	501,944	399,624
Provision for income taxes	61,581	70,477	116,256	119,626
Net income	175,398	163,700	385,688	279,998
Less: Net income attributable to non-controlling interests	1,033	787	4,529	4,453
Net income attributable to common stock	$ 174,365	$ 162,913	$ 381,159	$ 275,545
Earnings per share attributable to common stock:
Basic (in dollars per share)	$ 1.25	$ 1.16	$ 2.72	$ 1.95
Diluted (in dollars per share)	$ 1.21	$ 1.13	$ 2.64	$ 1.90
Shares used in computing earnings per share:
Weighted average basic shares outstanding (in shares)	140,008,000	140,542,000	140,134,000	141,610,000
Weighted average diluted shares outstanding (in shares)	144,304,000	144,363,000	144,448,000	144,985,000

XML

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 175,398	$ 163,700	$ 385,688	$ 279,998
Other comprehensive income (loss), net of tax provision:
Foreign currency translation adjustment, net of tax of $0, $0, $0 and $0	(26,429)	15,707	(10,009)	(32,524)
Other, net of tax of $1, $0, $4 and $0	6	0	20	0
Other comprehensive income (loss)	(26,423)	15,707	(9,989)	(32,524)
Comprehensive income	148,975	179,407	375,699	247,474
Less: Comprehensive income attributable to non-controlling interests	1,033	787	4,529	4,453
Total comprehensive income attributable to common stock	$ 147,942	$ 178,620	$ 371,170	$ 243,021

XML

Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustment, tax	$ 0	$ 0	$ 0	$ 0
Other, tax	$ 1	$ 0	$ 4	$ 0

XML

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Cash Flows from Operating Activities:
Net income	$ 175,398	$ 163,700	$ 385,688	$ 279,998
Adjustments to reconcile net income to net cash provided by operating activities—
Depreciation	61,616	56,244	186,480	165,180
Amortization of intangible assets	22,772	19,687	65,418	55,374
Asset impairment charges	0	0	2,319	0
Impairment of cost method investment	0	0	0	9,311
Change in fair value of contingent consideration liabilities	(787)	78	(1,360)	598
Equity in (earnings) losses of unconsolidated affiliates	(10,758)	(5,260)	(24,734)	2,207
Amortization of deferred financing costs	3,919	3,070	5,609	4,247
Gain on sale of property and equipment	(1,077)	(2,246)	(10,931)	(4,218)
Provision for credit losses	249	1,566	24,169	2,910
Deferred income tax provision (benefit)	(2,502)	(17,443)	14,245	(19,226)
Non-cash stock-based compensation	21,642	21,431	64,252	58,323
Foreign currency gain	(4,901)	(1,505)	(6,531)	(4,942)
Payments for contingent consideration liabilities	0	0	0	(590)
Changes in operating assets and liabilities, net of non-cash transactions	(247,695)	(124,463)	(372,187)	290,715
Net cash provided by operating activities	17,876	114,859	332,437	839,887
Cash Flows from Investing Activities:
Capital expenditures	(74,612)	(50,780)	(232,996)	(167,037)
Proceeds from sale of property and equipment	16,431	5,844	35,101	18,460
Proceeds from insurance settlements related to property and equipment	255	73	535	271
Cash paid for acquisitions, net of cash, cash equivalents and restricted cash acquired	(33,261)	(187,655)	(101,373)	(212,092)
Proceeds from disposition of businesses	0	203	0	11,064
Investments in unconsolidated affiliates and other	(5,154)	(778)	(119,478)	(9,538)
Cash received from investments in unconsolidated affiliates and other entities	5	2,538	3,022	2,570
Cash paid for intangible assets	(200)	0	(524)	0
Net cash used in investing activities	(96,536)	(230,555)	(415,713)	(356,302)
Cash Flows from Financing Activities:
Borrowings under credit facility	1,240,766	478,762	3,124,845	2,453,941
Payments under credit facility	(1,142,350)	(1,648,614)	(2,857,190)	(3,602,660)
Proceeds from notes offering	1,487,450	990,130	1,487,450	990,130
Payments of other long-term debt	(916)	(652)	(2,530)	(1,635)
Net repayments of short-term debt, net of borrowings	13,619	(1,761)	9,372	(6,180)
Deferred financing costs	(5,056)	(7,794)	(5,056)	(7,794)
Payments for contingent consideration liabilities	0	0	(263)	(10,399)
Distributions to non-controlling interests	(1,107)	(744)	(6,357)	(4,669)
Payments related to tax withholding for stock-based compensation	(2,638)	(830)	(63,131)	(24,403)
Payment of dividends	(8,414)	(7,001)	(25,627)	(21,545)
Repurchase of common stock	(17,764)	0	(66,687)	(200,000)
Net cash provided by (used in) financing activities	1,563,590	(198,504)	1,594,826	(435,214)
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	(549)	449	738	986
Net increase in cash, cash equivalents and restricted cash	1,484,381	(313,751)	1,512,288	49,357
Cash, cash equivalents and restricted cash, beginning of period	214,715	532,853	186,808	169,745
Cash, cash equivalents and restricted cash, end of period	$ 1,699,096	$ 219,102	$ 1,699,096	$ 219,102

XML

Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Adjustment due to Adoption of New ASU	Common Stock Common Stock	Common Stock Exchangeable Shares	Additional Paid-In Capital	Retained Earnings	Retained Earnings Adjustment due to Adoption of New ASU	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total Stockholders' Equity	Total Stockholders' Equity Adjustment due to Adoption of New ASU	Non-controlling Interests
Balance (in shares) at Dec. 31, 2019			142,324,318	36,183
Balance at Dec. 31, 2019	$ 4,053,831	$ (3,841)	$ 2	$ 0	$ 2,024,610	$ 2,854,271	$ (3,841)	$ (241,818)	$ (586,773)	$ 4,050,292	$ (3,841)	$ 3,539
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(82,968)							(82,968)		(82,968)
Acquisitions (in shares)			121,089
Acquisitions	4,329				4,329					4,329
Stock-based compensation activity (in shares)			1,124,530
Stock-based compensation activity	(8,306)				11,444				(19,750)	(8,306)
Exchange of exchangeable shares (in shares)			36,183	(36,183)
Common stock repurchases (in shares)			(5,960,134)
Common stock repurchases	(200,000)								(200,000)	(200,000)
Dividends declared	(7,184)					(7,184)				(7,184)
Distributions to non-controlling interests	(1,963)											(1,963)
Other	(223)					(516)				(516)		293
Net income	41,503					38,686				38,686		2,817
Balance (in shares) at Mar. 31, 2020			137,645,986	0
Balance at Mar. 31, 2020	3,795,178		$ 2	$ 0	2,040,383	2,881,416		(324,786)	(806,523)	3,790,492		4,686
Balance (in shares) at Dec. 31, 2019			142,324,318	36,183
Balance at Dec. 31, 2019	4,053,831	$ (3,841)	$ 2	$ 0	2,024,610	2,854,271	$ (3,841)	(241,818)	(586,773)	4,050,292	$ (3,841)	3,539
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(32,524)
Net income	279,998
Balance (in shares) at Sep. 30, 2020			138,843,346	0
Balance at Sep. 30, 2020	4,155,566		$ 2	$ 0	2,130,057	3,103,849		(274,342)	(807,616)	4,151,950		3,616
Balance (in shares) at Mar. 31, 2020			137,645,986	0
Balance at Mar. 31, 2020	3,795,178		$ 2	$ 0	2,040,383	2,881,416		(324,786)	(806,523)	3,790,492		4,686
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	34,737							34,737		34,737
Stock-based compensation activity (in shares)			65,826
Stock-based compensation activity	22,436				22,717				(281)	22,436
Dividends declared	(7,182)					(7,182)				(7,182)
Distributions to non-controlling interests	(1,962)											(1,962)
Net income	74,795					73,946				73,946		849
Balance (in shares) at Jun. 30, 2020			137,711,812	0
Balance at Jun. 30, 2020	3,918,002		$ 2	$ 0	2,063,100	2,948,180		(290,049)	(806,804)	3,914,429		3,573
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	15,707							15,707		15,707
Acquisitions (in shares)			1,087,774
Acquisitions	45,532				45,532					45,532
Stock-based compensation activity (in shares)			43,760
Stock-based compensation activity	20,613				21,425				(812)	20,613
Dividends declared	(7,244)					(7,244)				(7,244)
Distributions to non-controlling interests	(744)											(744)
Net income	163,700					162,913				162,913		787
Balance (in shares) at Sep. 30, 2020			138,843,346	0
Balance at Sep. 30, 2020	4,155,566		$ 2	$ 0	2,130,057	3,103,849		(274,342)	(807,616)	4,151,950		3,616
Balance (in shares) at Dec. 31, 2020			138,300,191
Balance at Dec. 31, 2020	4,348,972		$ 2		2,170,026	3,264,967		(232,997)	(857,817)	4,344,181		4,791
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	8,539							8,539		8,539
Stock-based compensation activity (in shares)			1,368,739
Stock-based compensation activity	(41,399)				13,702				(55,101)	(41,399)
Common stock repurchases (in shares)			(222,081)
Common stock repurchases	(17,710)								(17,710)	(17,710)
Dividends declared	(8,429)					(8,429)				(8,429)
Distributions to non-controlling interests	(1,129)											(1,129)
Net income	91,319					89,761				89,761		1,558
Balance (in shares) at Mar. 31, 2021			139,446,849
Balance at Mar. 31, 2021	4,380,163		$ 2		2,183,728	3,346,299		(224,458)	(930,628)	4,374,943		5,220
Balance (in shares) at Dec. 31, 2020			138,300,191
Balance at Dec. 31, 2020	4,348,972		$ 2		2,170,026	3,264,967		(232,997)	(857,817)	4,344,181		4,791
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(9,989)
Net income	385,688
Balance (in shares) at Sep. 30, 2021			139,111,888
Balance at Sep. 30, 2021	4,633,832		$ 2		2,232,319	3,620,409		(242,986)	(979,034)	4,630,710		3,122
Balance (in shares) at Mar. 31, 2021			139,446,849
Balance at Mar. 31, 2021	4,380,163		$ 2		2,183,728	3,346,299		(224,458)	(930,628)	4,374,943		5,220
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	7,895							7,895		7,895
Stock-based compensation activity (in shares)			64,600
Stock-based compensation activity	24,961				25,177				(216)	24,961
Common stock repurchases (in shares)			(313,725)
Common stock repurchases	(29,450)								(29,450)	(29,450)
Dividends declared	(8,650)					(8,650)				(8,650)
Distributions to non-controlling interests	(4,121)											(4,121)
Other	25											25
Net income	118,971					117,033				117,033		1,938
Balance (in shares) at Jun. 30, 2021			139,197,724
Balance at Jun. 30, 2021	4,489,794		$ 2		2,208,905	3,454,682		(216,563)	(960,294)	4,486,732		3,062
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(26,423)							(26,423)		(26,423)
Acquisitions (in shares)			32,822
Acquisitions	2,479				2,479					2,479
Stock-based compensation activity (in shares)			66,100
Stock-based compensation activity	19,023				20,935				(1,912)	19,023
Common stock repurchases (in shares)			(184,758)
Common stock repurchases	(16,828)								(16,828)	(16,828)
Dividends declared	(8,638)					(8,638)				(8,638)
Distributions to non-controlling interests	(1,107)											(1,107)
Other	134											134
Net income	175,398					174,365				174,365		1,033
Balance (in shares) at Sep. 30, 2021			139,111,888
Balance at Sep. 30, 2021	$ 4,633,832		$ 2		$ 2,232,319	$ 3,620,409		$ (242,986)	$ (979,034)	$ 4,630,710		$ 3,122

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Condensed Consolidated Statements of Equity (Parenthetical) - USD ($) $ in Thousands								3 Months Ended
	Aug. 27, 2021	May 27, 2021	Mar. 25, 2021	Dec. 11, 2020	Aug. 26, 2020	May 28, 2020	Mar. 26, 2020	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.05	$ 0.05	$ 0.05	$ 0.06	$ 0.06	$ 0.06	$ 0.05	$ 0.05	$ 0.05
Other								$ 134	$ 25				$ (223)

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Business and Organization

9 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Business and Organization

BUSINESS AND ORGANIZATION:

Quanta Services, Inc. (together with its subsidiaries, Quanta) is a leading provider of specialty contracting services, delivering comprehensive infrastructure solutions for the electric and gas utility, communications, pipeline and energy industries in the United States, Canada, Australia and select other international markets. Quanta reports its results under two reportable segments: (1) Electric Power Infrastructure Solutions and (2) Underground Utility and Infrastructure Solutions.

On October 13, 2021, Quanta completed the acquisition of Blattner Holding Company and its operating subsidiaries (collectively, Blattner). Blattner is a large utility-scale renewable energy infrastructure solutions provider that is located and primarily operates in North America. For additional information regarding this acquisition, see Note 4. Blattner provides comprehensive solutions to customers in the renewable energy industry, which generally include front-end engineering, procurement, project management and construction services for wind, solar and energy storage projects. Blattner’s results will be included in Quanta’s consolidated financial statements beginning on the acquisition date.

Electric Power Infrastructure Solutions Segment

The Electric Power Infrastructure Solutions segment provides comprehensive network solutions to customers in the electric power and other industries. Services performed by the Electric Power Infrastructure Solutions segment generally include the design, new construction, upgrade and repair and maintenance of electric power transmission and distribution infrastructure and substation facilities, along with other engineering and technical services. This includes solutions that support the implementation of upgrades by utilities to modernize and harden the electric power grid in order to ensure its safety and enhance reliability. In addition, this segment provides engineering and construction services for switchyards and transmission infrastructure needed to interconnect renewable energy generation, including solar, wind, hydro power and backup natural gas generation facilities. This segment also provides emergency restoration services, including the repair of infrastructure damaged by fire and inclement weather; the energized installation, maintenance and upgrade of electric power infrastructure utilizing unique bare hand and hot stick methods and Quanta’s proprietary robotic arm techniques; and the installation of “smart grid” technologies on electric power networks. Engineering and construction services related to, among other things, electric vehicle charging infrastructure, micro-grids and battery storage are also performed in this segment. This segment also provides comprehensive design and construction solutions to wireline and wireless communications companies, cable multi-system operators and other customers within the communications industry, including services in connection with 5G wireless deployment; and the design, installation, maintenance and repair of commercial and industrial wiring. This segment also provides aviation services in support of the services described above and includes the majority of the financial results of Quanta’s postsecondary educational institution, which specializes in pre-apprenticeship training, apprenticeship training and specialized utility task training for electric workers, as well as training for the gas distribution and communications industries.

Underground Utility and Infrastructure Solutions Segment

The Underground Utility and Infrastructure Solutions segment provides comprehensive infrastructure solutions, including design, engineering, new construction, upgrade and repair and maintenance services, to customers involved in the transportation, distribution, storage and processing of natural gas, oil and other products. Services include the upgrade, new construction and repair and maintenance of natural gas systems for gas utility customers, as well as pipeline protection, integrity testing, rehabilitation and replacement. Quanta also provides catalyst replacement services, high-pressure and critical-path turnaround services, instrumentation and electrical services, piping, fabrication and storage tank services to the midstream and downstream industrial energy markets. This segment also provides engineering and construction services for pipeline systems, storage systems and compressor and pump stations and the fabrication of pipeline support systems and related structures and facilities, as well as trenching, directional boring and mechanized welding services related to the services described above and in connection with our electric power infrastructure services. To a lesser extent, this segment includes construction services for the offshore energy market and services in connection with the design, installation and maintenance of fueling systems and water and sewer infrastructure.

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

Principles of Consolidation

The condensed consolidated financial statements of Quanta include the accounts of Quanta Services, Inc. and its wholly-owned subsidiaries, which are also referred to as its operating units. The condensed consolidated financial statements also include the accounts of certain of Quanta’s investments in joint ventures, which are either consolidated or proportionately consolidated. Investments in affiliated entities in which Quanta does not have a controlling financial interest, but over which Quanta has significant influence, usually because Quanta holds a voting interest of between 20% and 50% in the affiliated entity, are accounted for using the equity method. Unless the context requires otherwise, references to Quanta include Quanta Services, Inc. and its consolidated subsidiaries.

Interim Condensed Consolidated Financial Information

These unaudited condensed consolidated financial statements have been prepared pursuant to the rules of the U.S. Securities and Exchange Commission (SEC). Certain information and footnote disclosures, normally included in annual financial statements prepared in accordance with generally accepted accounting principles in the United States (GAAP), have been condensed or omitted pursuant to those rules and regulations. Quanta believes that the disclosures made are adequate to make the information presented not misleading. In the opinion of management, all adjustments, consisting only of normal recurring adjustments, necessary to fairly state the financial position, results of operations, comprehensive income and cash flows with respect to the interim condensed consolidated financial statements have been included. The results of operations and comprehensive income for the interim periods are not necessarily indicative of the results for the entire fiscal year. The results of Quanta have historically been subject to significant seasonal fluctuations.

Quanta recommends that these unaudited condensed consolidated financial statements be read in conjunction with the audited consolidated financial statements and notes thereto of Quanta and its consolidated subsidiaries, which contain additional information about Quanta’s policies and are included in Quanta’s 2020 Annual Report.

Use of Estimates and Assumptions

The preparation of financial statements in conformity with GAAP requires the use of estimates and assumptions by management in determining the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities known to exist as of the date the financial statements are published, and the reported amounts of revenues and expenses recognized during the periods presented. Quanta reviews all significant estimates affecting its consolidated financial statements on a recurring basis and records the effect of any necessary adjustments prior to their publication. Judgments and estimates are based on Quanta’s beliefs and assumptions derived from information available at the time such judgments and estimates are made. Uncertainties with respect to such estimates and assumptions are inherent in the preparation of financial statements. Estimates are primarily used in Quanta’s assessment of revenue recognition for construction contracts, including contractual change orders and claims; allowance for credit losses; valuation of inventory; useful lives of assets; fair value assumptions in analyzing goodwill, other intangibles and long-lived asset impairments; equity and other investments; purchase price allocations; acquisition-related contingent consideration liabilities; multiemployer pension plan withdrawal liabilities; contingent liabilities associated with, among other things, legal proceedings and claims, parent guarantees and indemnity obligations; estimated insurance claim recoveries; stock-based compensation; operating results of reportable segments; provision for income taxes; and uncertain tax positions.

Revenue Recognition

Quanta’s services may be provided pursuant to master service agreements (MSAs), repair and maintenance contracts and fixed price and non-fixed price construction contracts. These contracts are classified into three categories based on the methods by which transaction prices are determined and revenue is recognized: unit-price contracts, cost-plus contracts and fixed price contracts. Transaction prices for unit-price contracts are determined on a per unit basis, transaction prices for cost-plus contracts are determined by applying a profit margin to costs incurred on the contracts and transaction prices for fixed price contracts are determined on a lump-sum basis.

Performance Obligations

At September 30, 2021 and December 31, 2020, the aggregate transaction price allocated to unsatisfied or partially satisfied performance obligations was approximately $4.37 billion and $3.99 billion, of which 78.7% and 71.2% were expected to be recognized in the subsequent twelve months. These amounts represent management’s estimates of the consolidated revenues that are expected to be realized from the remaining portion of firm orders under fixed price contracts not yet completed or for which work had not yet begun as of such dates. For purposes of calculating remaining performance

obligations, Quanta includes all estimated revenues attributable to consolidated joint ventures and variable interest entities, revenues from funded and unfunded portions of government contracts to the extent they are reasonably expected to be realized and revenues from change orders and claims to the extent management believes additional contract revenues will be earned and are deemed probable of collection. Excluded from remaining performance obligations are potential orders under MSAs and non-fixed price contracts expected to be completed within one year.

Contract Estimates

Actual revenues and project costs can vary, sometimes substantially, from previous estimates due to changes in a variety of factors, including unforeseen or changed circumstances not included in Quanta’s cost estimates or covered by its contracts. Some of the factors that can result in positive changes in estimates on projects include successful execution through project risks, reduction of estimated project costs or increases of estimated revenues. Some of the factors that can result in negative changes in estimates include concealed or unknown site conditions; changes to or disputes with customers regarding the scope of services; changes in estimates related to the length of time to complete a performance obligation; changes or delays with respect to permitting and regulatory requirements; changes in the cost or availability of equipment, commodities, materials or skilled labor; unanticipated costs or claims due to delays or failure to perform by customers or third parties; customer failure to provide required materials or equipment; errors in engineering, specifications or designs; project modifications; adverse weather conditions, natural disasters, and other emergencies (including the ongoing COVID-19 pandemic); and performance and quality issues causing delay (including payment of liquidated damages) or requiring rework or replacement. Any changes in estimates may result in changes to profitability or losses associated with the related performance obligations.

Changes in estimated revenues, costs and profit are recognized on a cumulative catch-up basis and recorded in the period they are determined to be probable and can be reasonably estimated. Such changes in estimates can result in the recognition of revenue in a current period for performance obligations that were satisfied or partially satisfied in prior periods or the reversal of previously recognized revenue if the currently estimated revenue is less than the previous estimate. The impact of a change in contract estimate is measured as the difference between the revenue or gross profit recognized in the prior period as compared to the revenue or gross profit which would have been recognized had the revised estimate been used as the basis of recognition in the prior period. Changes in estimates can also result in contract losses, which are recognized in full when they are determined to be probable and can be reasonably estimated.

Operating results for the three months ended September 30, 2021 were favorably impacted by $41.9 million, or 7.8%, of gross profit as a result of aggregate changes in contract estimates related to projects that were in progress at June 30, 2021. Operating results for the nine months ended September 30, 2021 were favorably impacted by $127.4 million, or 9.4%, of gross profit as a result of aggregate changes in contract estimates related to projects that were in progress at December 31, 2020. The overall favorable impact resulted from net positive changes in estimates across a large number of projects, primarily as a result of favorable performance and successful mitigation of risks and contingencies as the projects progressed to completion.

Operating results for the three months ended September 30, 2020 were favorably impacted by $48.7 million, or 9.6%, of gross profit as a result of aggregate changes in contract estimates related to projects that were in progress at June 30, 2020. Operating results for the nine months ended September 30, 2020 were impacted by less than 5% of gross profit as a result of aggregate changes in contract estimates related to projects that were in progress at December 31, 2019.

Certain projects were materially impacted by changes to estimated contract revenues and/or project costs during the three and nine months ended September 30, 2020. Revenues and gross profit were favorably impacted as a result of successful execution through project risks and close-out activities on certain large pipeline projects in the United States, as well as a project scope reduction on a large pipeline project in the United States that allowed Quanta to recognize a portion of previously deferred milestone payments and reduce certain contingencies on the project. The favorable impact related to these projects was partially offset by increased costs on two large pipeline projects in Canada that experienced severe weather conditions during the three and nine months ended September 30, 2020, both of which were complete as of September 30, 2021. With respect to all of these large pipeline projects, the aggregate net favorable impact on gross profit related to work performed in prior periods was $32.9 million and $15.1 million during the three and nine months ended September 30, 2020.

Additionally, during the three and nine months ended September 30, 2020, Quanta was pursuing the orderly exit of its Latin American operations, which was substantially complete as of December 31, 2020. These operations were adversely impacted by the COVID-19 pandemic due to shelter-in-place restrictions and other work disruptions, and as a result Quanta accelerated various contract terminations and other activities in order to expedite cessation of operations in the region. These factors resulted in changes in estimates on several projects and negatively impacted gross profit related to work performed in prior periods by $12.1 million and $28.6 million in the aggregate during the three and nine months ended September 30, 2020.

Changes in cost estimates on certain contracts may also result in the issuance of change orders, which can be approved or unapproved by the customer, or the assertion of contract claims. As of September 30, 2021 and December 31, 2020, Quanta had recognized revenues of $254.1 million and $141.2 million related to change orders and claims included as contract price adjustments that were in the process of being negotiated in the normal course of business. The largest component of the revenues recognized is associated with change orders and claims arising from delays on two electric transmission projects in Canada. The most significant delays on these projects occurred in the first and third quarters of 2021 and were related to the COVID-19 pandemic that negatively impacted productivity. Additionally, during the third quarter of 2021, both of the projects were negatively impacted by unrelated wildfires, and one was also impacted by acceleration of the project timeline, all of which resulted in change orders. Quanta believes that the contracts for these projects entitle it to recover certain amounts associated with these delays. The aggregate amounts related to change orders and claims, which are included in “Contract assets” in the accompanying condensed consolidated balance sheets, represent management’s estimates of additional contract revenues that have been earned and are probable of collection. However, Quanta’s estimates could change, and the amount ultimately realized could be significantly higher or lower than the estimated amount.

Revenues by Category

The following tables present Quanta’s revenue disaggregated by geographic location, as determined by the job location, and contract type (in thousands):

	Three Months Ended September 30,								Nine Months Ended September 30,
	2021				2020				2021				2020
By primary geographic location:
United States	$	2,892,446	86.2	%	$	2,629,606	87.1	%	$	7,669,360	84.7	%	$	7,105,568	85.7	%
Canada	382,072		11.4	%	320,576		10.6	%	1,123,077		12.4	%	917,621		11.1	%
Australia	52,804		1.6	%	49,537		1.6	%	170,719		1.9	%	156,664		1.9	%
Others	25,956		0.8	%	20,442		0.7	%	93,519		1.0	%	110,634		1.3	%
Total revenues	$	3,353,278	100.0	%	$	3,020,161	100.0	%	$	9,056,675	100.0	%	$	8,290,487	100.0	%

	Three Months Ended September 30,								Nine Months Ended September 30,
	2021				2020				2021				2020
By contract type:
Unit-price contracts	$	1,399,358	41.8	%	$	1,141,102	37.7	%	$	3,593,644	39.7	%	$	3,034,169	36.6	%
Cost-plus contracts	825,622		24.6	%	702,392		23.3	%	2,247,879		24.8	%	1,958,404		23.6	%
Fixed price contracts	1,128,298		33.6	%	1,176,667		39.0	%	3,215,152		35.5	%	3,297,914		39.8	%
Total revenues	$	3,353,278	100.0	%	$	3,020,161	100.0	%	$	9,056,675	100.0	%	$	8,290,487	100.0	%

Under fixed price contracts, as well as unit-price contracts with more than an insignificant amount of partially completed units, revenue is recognized as performance obligations are satisfied over time, with the percentage completion generally measured as the percentage of costs incurred to total estimated costs for such performance obligation. Approximately 42.5% and 47.9% of Quanta’s revenues recognized during the three months ended September 30, 2021 and 2020 were associated with this revenue recognition method, and 43.4% and 48.4% of Quanta’s revenues recognized during the nine months ended September 30, 2021 and 2020 were associated with this revenue recognition method.

Contract Assets and Liabilities

Contract assets and liabilities, recorded as current assets and liabilities, respectively, consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Contract assets	$	760,279	$	453,832
Contract liabilities	$	501,142	$	528,864

Contract assets and liabilities fluctuate period to period based on various factors, including, among others, changes in the number and size of projects in progress at period end and variability in billing and payment terms, such as up-front or advance billings, interim or milestone billings, deferred billings and unapproved change orders and contract claims recognized in

revenues. The increase in contract assets from December 31, 2020 to September 30, 2021 was primarily due to increased working capital requirements related to progress on two large electric transmission projects in Canada and the timing of billings for such projects. Both of the projects were negatively impacted by delays related to the COVID-19 pandemic and unrelated wildfires, and one project was also impacted by acceleration of the project timeline, all of which resulted in change orders and an increase in contract assets.

Revenues were positively impacted by $151.7 million during the nine months ended September 30, 2021 as a result of changes in estimates associated with performance obligations on fixed price contracts partially satisfied prior to December 31, 2020. During the nine months ended September 30, 2021, Quanta recognized revenue of approximately $381.9 million related to contract liabilities outstanding at December 31, 2020.

Current and Long-Term Accounts Receivable and Allowance for Credit Losses

Quanta’s historical loss ratio and its determination of risk pools, which are used to calculate expected credit losses, may be adjusted for changes in customer credit concentrations within its portfolio of financial assets, customers’ ability to pay, and other considerations, such as economic and market changes, changes to the regulatory or technological environments affecting customers and the consistency between current and forecasted economic conditions and historical economic conditions used to derive historical loss ratios. At the end of each quarter, management reassesses these and other relevant factors, including any potential effects from the currently challenged energy market and the ongoing COVID-19 pandemic.

Quanta considers accounts receivable delinquent after 30 days but does not generally consider such amounts delinquent in its credit loss analysis unless the accounts receivable are at least 90 days past due. In addition to monitoring delinquent accounts, management monitors the credit quality of its receivables by, among other things, obtaining credit ratings of significant customers, assessing economic and market conditions and evaluating material changes to a customer’s business, cash flows and financial condition. Should anticipated recoveries relating to receivables fail to materialize, including anticipated recoveries relating to bankruptcies or other workout situations, Quanta could experience reduced cash flows and losses in excess of current allowances provided.

For example, in July 2021 Limetree Bay Refining, LLC (Limetree Refining), a customer within Quanta’s Underground Utility and Infrastructure Solutions segment, filed for bankruptcy protection under Chapter 11 of the U.S. Bankruptcy Code, as amended, after experiencing operational and financial difficulties and shutting down operations at its refinery. As of September 30, 2021, Quanta had $31.3 million of billed and unbilled receivables for services performed and other costs. Quanta also had $0.7 million of billed and unbilled receivables outstanding from Limetree Bay Terminals, LLC (Limetree Terminals), an affiliate of Limetree Refining that has not filed for bankruptcy. During the three months ended June 30, 2021, Quanta recorded a provision for credit loss of $23.6 million with respect to these receivables based on the current estimated amount of expected loss. However, given the uncertainties associated with the bankruptcy proceeding and the financial condition of the customers, the amount of receivables ultimately collected and the ultimate amount of credit loss recognized depends on a number of factors that are subject to change, including, among other things, the potential sale of the refinery assets by Limetree Refining, negotiations with respect to payment of the amounts owed by Limetree Terminals and the result of any preferential payment actions brought in the bankruptcy proceeding. As such, an additional allowance for credit loss may be recorded in the future, including with respect to the remaining $8.4 million of receivables owed by the customers. See Concentrations of Credit Risk in Note 10 for further discussion of the credit quality of certain other outstanding receivables due from customers that have experienced financial difficulties.

Activity in Quanta’s allowance for credit losses consisted of the following (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Balance at beginning of period	$	39,713	$	14,948	$	16,546	$	9,398
Cumulative effect of adoption of new credit loss standard	—		—		—		5,067
Provision for credit losses	249		1,566		24,169		2,910
Direct write-offs charged against the allowance	(253)		(110)		(1,006)		(971)
Balance at end of period	$	39,709	$	16,404	$	39,709	$	16,404

Certain contracts allow customers to withhold a small percentage of billings pursuant to retainage provisions, and such amounts are generally due upon completion of the contract and acceptance of the project by the customer. Based on Quanta’s

experience in recent years, the majority of these retainage balances are expected to be collected within approximately twelve months of September 30, 2021. Retainage balances with expected settlement dates within twelve months of September 30, 2021 and December 31, 2020 were $295.9 million and $306.3 million, which are included in “Accounts receivable.” Retainage balances with expected settlement dates beyond twelve months of September 30, 2021 and December 31, 2020 were each $88.2 million and are included in “Other assets, net.”

Quanta recognizes unbilled receivables for non-fixed price contracts within “Accounts receivable” in certain circumstances, such as when revenues have been earned and recorded but the amount cannot be billed under the terms of the contract until a later date or when amounts arise from routine lags in billing (for example, work completed during one month but not billed until the next month). These balances do not include revenues recognized for work performed under fixed-price contracts, as these amounts are recorded as “Contract assets.” At September 30, 2021 and December 31, 2020, unbilled receivables included in “Accounts receivable” were $827.3 million and $472.3 million. The increase in unbilled receivables was primarily due to the ramp up of work, certain delays in billing related to a large customer and a significant amount of emergency restoration services revenues performed in the latter part of the third quarter that remained unbilled at the end of the quarter. Quanta also recognizes unearned revenues for non-fixed price contracts when cash is received prior to recognizing revenues for the related performance obligation. Unearned revenues, which are included in “Accounts payable and accrued expenses,” were $39.5 million and $53.6 million at September 30, 2021 and December 31, 2020.

Cash and Cash Equivalents

Amounts related to Quanta’s cash and cash equivalents based on geographic location of the bank accounts were as follows (in thousands):

	September 30, 2021		December 31, 2020
Cash and cash equivalents held in domestic bank accounts	$	1,664,990	$	156,122
Cash and cash equivalents held in foreign bank accounts	31,220		28,498
Total cash and cash equivalents	$	1,696,210	$	184,620

At September 30, 2021 and December 31, 2020, cash equivalents were $1.63 billion and $98.0 million and consisted primarily of money market investments and money market mutual funds and are discussed further in the Fair Value Measurements section within this Note 2. The proceeds received from Quanta’s issuance of senior notes on September 23, 2021 represented a significant portion of the cash and cash equivalents balance at September 30, 2021, and such proceeds were utilized to fund the acquisition of Blattner on October 13, 2021, as described further in Notes 4 and 6.

Cash and cash equivalents held by joint ventures, which are either consolidated or proportionately consolidated, are available to support joint venture operations, but Quanta cannot utilize those assets to support its other operations. Quanta generally has no right to cash and cash equivalents held by a joint venture other than participating in distributions, to the extent made, and in the event of dissolution. Cash and cash equivalents held by Quanta’s wholly-owned captive insurance company are generally not available for use in support of its other operations. Amounts related to cash and cash equivalents held by joint ventures and the captive insurance company, which are included in Quanta’s total cash and cash equivalents balances, were as follows (in thousands):

	September 30, 2021		December 31, 2020
Cash and cash equivalents held by domestic joint ventures	$	13,377	$	7,714
Cash and cash equivalents held by foreign joint ventures	4,568		3,973
Total cash and cash equivalents held by joint ventures	17,945		11,687
Cash and cash equivalents held by captive insurance company	132,916		85,014
Cash and cash equivalents not held by joint ventures or captive insurance company	1,545,349		87,919
Total cash and cash equivalents	$	1,696,210	$	184,620

Goodwill and Other Intangible Assets

Goodwill, net of accumulated impairment losses, represents the excess of cost over the fair market value of net tangible and identifiable intangible assets of acquired businesses and is stated at cost. Quanta has determined that its individual operating units represent its reporting units for the purpose of assessing goodwill impairment. Goodwill is not amortized but is tested for impairment annually in the fourth quarter of the fiscal year, or more frequently if events or circumstances arise which indicate

that goodwill may be impaired. Qualitative indicators that may trigger the need for annual or interim quantitative impairment testing include, among other things, deterioration in macroeconomic conditions; declining financial performance; deterioration in the operational environment; an expectation of selling or disposing of a portion of a reporting unit; a significant change in market, management, business strategy or business climate; a loss of a significant customer; increased competition; a sustained decrease in share price; or a decrease in Quanta’s market capitalization below book value. Quanta did not identify any triggering events in the first three quarters of 2021 and did not recognize any goodwill impairments for the three and nine months ended September 30, 2021.

Quanta’s intangible assets include customer relationships; backlog; trade names; non-compete agreements; patented rights, developed technology, and process certifications; and curriculum, all of which are subject to amortization, as well as an engineering license, which is not subject to amortization. As a result of the broader challenges in the energy market, the effect of which continues to be exacerbated by the COVID-19 pandemic, Quanta assessed the expected negative impact related to its intangible assets, particularly intangible assets associated with reporting units within the Underground Utility and Infrastructure Solutions Division. Quanta concluded that such impact is not likely to result in intangible asset impairments, and therefore no intangible asset impairments were recognized during the three and nine months ended September 30, 2021.

In connection with its annual goodwill assessment in 2020, Quanta also considered the sensitivity of its fair value estimates to changes in certain valuation assumptions, including with respect to reporting units within Quanta’s Underground Utility and Infrastructure Solutions Division that have recently been negatively impacted by energy market challenges. The potential future impact of these challenges is uncertain and depends on numerous factors and could continue or increase in future periods. In particular, two Canadian pipeline-related businesses and a United States material handling services business were identified in the annual goodwill assessment to have an increased risk of goodwill impairment in the near and medium term due to the currently challenged energy market. After taking into account a 10% decrease in fair value, these reporting units would have had fair values below their carrying amounts as of December 31, 2020. The aggregate goodwill and intangible asset balances for these three businesses totaled $100.1 million and $16.0 million as of September 30, 2021. In addition, a specialized industrial services business located in the United States experienced lower demand for certain services during the year ended December 31, 2020, which has continued in 2021, as customers reduced and deferred regularly scheduled maintenance due to lack of demand for refined products, particularly certain transportation-related fuels, as a result of the COVID-19 pandemic. After taking into account a 10% decrease in fair value, the reporting unit would have had a fair value in excess of its carrying amount as of December 31, 2020; however, uncertainty as to the timing and extent of recovery of demand for refined products has increased the risk of goodwill impairment for this reporting unit. The goodwill and intangible asset balances for this reporting unit were $313.4 million and $51.9 million as of September 30, 2021. Quanta will continue to monitor the goodwill associated with these reporting units, and should they suffer additional declines in actual or forecasted financial results, the risk of goodwill impairment would increase.

Investments in Affiliates and Other Entities

Investments in entities of which Quanta is not the primary beneficiary, but over which Quanta has the ability to exercise significant influence, are accounted for using the equity method of accounting. Equity method investments are carried at original cost adjusted for Quanta’s proportionate share of the investees’ income, losses and distributions. The carrying values for Quanta’s unconsolidated equity method investments were $73.8 million and $44.9 million at September 30, 2021 and December 31, 2020 and are included in “Other assets, net” in the accompanying condensed consolidated balance sheets. Quanta’s share of net income or losses of these investments is included within operating income in the accompanying condensed consolidated statements of operations when the investee is operationally integral to the operations of Quanta and is reported as “Equity in earnings (losses) of integral unconsolidated affiliates.” Quanta’s share of net income or losses of unconsolidated equity method investments that are not operationally integral to the operations of Quanta are included in “Other income (expense), net” below operating income in the accompanying condensed consolidated statements of operations. As of September 30, 2021, Quanta had receivables of $13.3 million and payables of $3.2 million from its integral unconsolidated affiliates.

During the nine months ended September 30, 2020, Quanta recognized impairment losses of $8.7 million related to a non-integral equity method investment, which were primarily due to the decline in commodity prices and production volumes during 2020. These impairment losses are included in “Other income (expense), net” in the accompanying condensed consolidated statements of operations for the nine months ended September 30, 2020.

In October 2021, Quanta acquired a 44% interest in an entity that provides right-of-way solutions, including site preparation and clearing, materials delivery and installation and management of permitting requirements and traffic control for approximately $18 million, subject to certain adjustments. This investment will be accounted for as an integral affiliate using the equity method of accounting.

Investments in entities of which Quanta is not the primary beneficiary, and over which Quanta does not have the ability to exercise significant influence are accounted for using the cost method of accounting. Additionally, certain investments provide for significant influence over the investee, but also include preferential liquidation rights, which precludes accounting for the investments under the equity method. These cost method investments are required to be measured at fair value, with changes in fair value recognized in net income unless the investments do not have readily determinable fair values, in which case the investments are measured at cost minus impairment (if any), plus or minus observable price changes in orderly transactions for an identical or similar investment in the same company. Earnings on investments accounted for using the cost method of accounting are recognized as dividends are declared. These earnings and any impairments of cost method investments are reported in “Other income (expense), net” in the accompanying condensed consolidated statements of operations.

The carrying values for investments accounted for using the cost method of accounting were $130.2 million and $39.5 million at September 30, 2021 and December 31, 2020, and these amounts are included in “Other assets, net” in the accompanying condensed consolidated balance sheets. During the three months ended March 31, 2021, Quanta acquired a minority interest in a broadband technology provider for $90.0 million. This investment includes preferential liquidation rights and is accounted for using the cost method of accounting. There have been no changes in the carrying value of the investment through September 30, 2021.

During the three months ended March 31, 2021, Quanta also purchased, through its wholly-owned captive insurance company, certain real property, including associated buildings and facilities, that is expected to be developed for its future corporate headquarters. A portion of this property is currently leased to third-party lessees and is expected to continue to be leased to third-party lessees in the future. As a result, an investment in real estate of $23.5 million was recognized at cost for the third-party leased portion of the property during the three months ended March 31, 2021, and the carrying amount of $23.4 million is included in “Other assets, net” in the accompanying condensed consolidated balance sheet at September 30, 2021.

During the three months ended June 30, 2020, Quanta recognized a $9.3 million impairment to an investment in a water and gas infrastructure contractor, which also represents the cumulative amount of impairment on investments accounted for using the cost method of accounting. Quanta did not exercise its option to acquire the remaining interest in this business at an agreed price based on a multiple of the company’s earnings during a designated performance period.

See Note 10 for additional information related to investments.

Puerto Rico Joint Venture

During the three months ended June 30, 2020, a joint venture in which Quanta owns a 50% interest, LUMA Energy, LLC (LUMA), was selected for a 15-year operation and maintenance agreement to operate, maintain and modernize the approximately 18,000-mile electric transmission and distribution system in Puerto Rico. In June 2021, LUMA completed the steps necessary to transition operation and maintenance of the system from the owner to LUMA and entered into an interim services agreement. Once the owner emerges from its Title III debt restructuring process, the 15-year operation and maintenance period is scheduled to begin. During the interim services period, LUMA receives a fixed annual management fee, payable in monthly installments, and is reimbursed for costs and expenses. During the 15-year operation and maintenance period, LUMA will continue to be reimbursed for costs and expenses and receive a fixed annual management fee, but will also have the opportunity to receive additional annual performance-based incentive fees. LUMA has not assumed and will not assume ownership of any electric transmission and distribution system assets or be responsible for operation of the power generation assets. Quanta’s ownership interest and participation in LUMA is accounted for as an equity method investment due to Quanta’s equal ownership and management of LUMA with its joint venture partner. LUMA is operationally integral to the operations of Quanta, and therefore Quanta’s share of LUMA’s net income or losses is reported within operating income in “Equity in earnings (losses) of integral unconsolidated affiliates.” Included within the equity method investments described above are Quanta’s equity interest in LUMA of $34.5 million and $10.9 million at September 30, 2021 and December 31, 2020.

Accounts payable and accrued expenses

Accounts payable and accrued expenses consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Accounts payable, trade	$	956,873	$	798,023
Accrued compensation and related expenses	497,451		378,002
Other accrued expenses	306,465		333,769
Accounts payable and accrued expenses	$	1,760,789	$	1,509,794

Income Taxes

Quanta regularly evaluates valuation allowances established for deferred tax assets for which future realization is uncertain, including in connection with changes in tax laws. The estimation of required valuation allowances includes estimates of future taxable income. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Quanta considers projected future taxable income and tax planning strategies in making this assessment. If actual future taxable income differs from these estimates, Quanta may not realize deferred tax assets to the extent estimated.

As of September 30, 2021, the total amount of unrecognized tax benefits relating to uncertain tax positions was $40.6 million, an increase of $7.4 million from December 31, 2020. The increase resulted primarily from a $5.0 million increase in reserves for uncertain tax positions expected to be taken in 2021 and a $2.4 million increase related to prior year positions. Quanta’s consolidated federal income tax return for tax year 2019 is currently under examination by the Internal Revenue Services (IRS), and Quanta’s consolidated federal income tax returns for tax years 2017, 2018, and 2020 remain open to examination by the IRS, as these statute of limitations periods have not yet expired. Additionally, various state and foreign tax returns filed by Quanta and certain subsidiaries for multiple periods remain under examination by various U.S. state and foreign tax authorities. Quanta believes it is reasonably possible that within the next 12 months unrecognized tax benefits may decrease by up to $13.3 million as a result of settlement of these examinations or as a result of the expiration of certain statute of limitations periods.

Fair Value Measurements

For disclosure purposes, qualifying assets and liabilities are categorized into three broad levels based on the priority of the inputs used to determine their fair values. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). Certain assumptions and other information as they relate to these qualifying assets and liabilities are described below.

Goodwill and Other Intangible Assets

Quanta has recorded goodwill and identifiable intangible assets in connection with certain of its historical business acquisitions. Quanta utilizes the fair value premise as the primary basis for its impairment valuation procedures. The Goodwill and Other Intangible Assets sections in Note 2 of the Notes to Consolidated Financial Statements in Item 8. Financial Statements and Supplementary Data in Part II of the 2020 Annual Report provide information regarding valuation methods, including the income approach, market approach and cost approach, and assumptions used to determine the fair value of these assets based on the appropriateness of each method in relation to the type of asset being valued. Quanta believes that the valuation methods it employs appropriately represent the methods that would be used by other market participants in determining fair value, and periodically engages the services of an independent valuation firm when a new business is acquired to assist management with the valuation process, including assistance with the selection of appropriate valuation methodologies and the development of market-based valuation assumptions. The level of inputs used for these fair value measurements is the lowest level (Level 3).

Investments

Equity investments with readily determinable fair values are measured at fair value, with changes in fair value recognized in net income. In cases where those readily determinable values are quoted market prices, the level of input used for these fair value measurements is the highest level (Level 1). Equity investments without readily determinable fair values are measured on a nonrecurring basis. These types of fair market value assessments are similar to other nonrecurring fair value measures used by Quanta, which include the use of significant judgments and available relevant market data. Such market data may include observations of the valuation of comparable companies, risk-adjusted discount rates and an evaluation of the expected

performance of the underlying portfolio asset, including historical and projected levels of profitability or cash flows. In addition, a variety of additional factors may be reviewed by management, including, but not limited to, contemporaneous financing and sales transactions with third parties, changes in market outlook and the third-party financing environment. The level of inputs used for these fair value measurements is the lowest level (Level 3).

Quanta has investments accounted for using the equity and cost methods of accounting. Quanta utilizes the fair value premise as the basis for its impairment valuation and recognizes impairment if there are sufficient indicators that the fair value of the investment is less than its carrying value.

Financial Instruments

The carrying amounts of cash equivalents, accounts receivable, contract assets, accounts payable, accrued expenses and contract liabilities approximate fair value due to the short-term nature of these instruments. All of Quanta’s cash equivalents were categorized as Level 1 assets at September 30, 2021 and December 31, 2020, as all values were based on unadjusted quoted prices for identical assets in an active market that Quanta has the ability to access.

Long-term Debt

The carrying amount of variable rate debt, which includes borrowings under Quanta’s senior credit facility, approximates fair value. Quanta’s fixed rate debt primarily includes its senior notes. The fair value of Quanta’s senior notes, which are described further in Note 6, was $2.52 billion at September 30, 2021, compared to a carrying value of $2.47 billion net of unamortized bond discount, underwriting discounts and deferred financing costs of $28.3 million. The fair value of the senior notes is based on the quoted market prices for the same issue, and the senior notes are categorized as Level 1 liabilities. See Note 6 for additional information regarding Quanta’s senior credit facility and senior notes.

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New Accounting Pronouncements

9 Months Ended

Sep. 30, 2021

Accounting Standards Update and Change in Accounting Principle [Abstract]

New Accounting Pronouncements

NEW ACCOUNTING PRONOUNCEMENTS:

Adoption of New Accounting Pronouncements

In December 2019, the FASB issued an update that, among other things, amends the guidance related to accounting for tax law changes when an entity has a year-to-date loss in an interim period and provides guidance on how to evaluate whether a step-up in tax basis of goodwill relates to a business combination or a separate transaction. This update is effective for interim and annual periods beginning after December 15, 2020, with certain amendments applied prospectively and other amendments applied on a modified retrospective basis. Quanta adopted this update effective January 1, 2021, and it did not have a material impact on Quanta’s condensed consolidated financial statements at the date of adoption.

In January 2020, the FASB issued an update that clarified the applicable guidance for measurement of the fair value of equity and cost method investments when there is a change in the level of ownership or degree of influence. Quanta adopted this update effective January 1, 2021 and will prospectively apply this update.

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Acquisitions

9 Months Ended

Sep. 30, 2021

Business Combination and Asset Acquisition [Abstract]

Acquisitions

ACQUISITIONS:

On October 13, 2021, Quanta completed the acquisition of Blattner, a large utility-scale renewable energy infrastructure solutions provider in North America. The consideration for this transaction consisted of approximately $2.29 billion paid in cash on the date of acquisition and 3.3 million shares of Quanta common stock, which had a fair value of $345.4 million as of the date of the acquisition. The final amount of consideration for this acquisition remains subject to certain post-closing adjustments, including with respect to net working capital. Additionally, pursuant to the terms of the agreement and plan of merger, the former owners of Blattner are eligible for the potential payment of up to $300 million of contingent consideration, payable to the extent the acquired business achieves certain financial performance objectives over a three-year period beginning in January 2022. Blattner’s results will be included in Quanta’s consolidated financial statements beginning on the acquisition date. Quanta is in the process of performing procedures to determine the fair value of assets acquired and liabilities assumed related to the acquisition of Blattner, including the fair value assessment of contingent consideration, and will include the preliminary purchase price allocation in its Annual Report on Form 10-K for the year ended December 31, 2021. See Note 6 for additional information regarding the financing of this acquisition.

In addition, in October 2021, Quanta acquired a business located in the United States that provides electric power construction and related services. The aggregate consideration for this acquisition included approximately $50.0 million paid or

payable in cash, subject to certain adjustments, and the issuance of 42,748 shares of common stock, which had a fair value of approximately $4.0 million at the acquisition date.

During the nine months ended September 30, 2021, Quanta acquired a communications services business located in the United States that performs data center connection services; a business located in the United States that designs, develops and holds a certification for the manufacture of personal protective breathing equipment and related monitoring devices primarily used in the refining and petrochemical industries, including in connection with catalyst services; a business located in Canada that provides front-end land services for infrastructure development projects in Canada and the United States; and a business located in the United States that primarily provides horizontal directional drilling services. The aggregate consideration for these acquisitions was $59.2 million paid or payable in cash (subject to certain adjustments) and 32,822 shares of Quanta common stock, which had a fair value of $2.5 million as of the applicable acquisition date.

During the year ended December 31, 2020, Quanta acquired a contractor located in the United States that provides electric power distribution, transmission and substation maintenance and construction, directional boring and emergency restoration services; a professional engineering business located in the United States that provides infrastructure engineering and design services to electric utilities, gas utilities and communications services companies, as well as permitting and utility locating services; a business located in the United States that provides aviation services primarily for the utility industry; an electric power infrastructure business located in the United States that primarily provides underground conduit services; a business located in the United States that specializes in the deployment of short- and long-haul fiber optic cable and utilities; an industrial services business located in Canada that performs catalyst handling services, including changeover and shutdown maintenance, for customers in the refining and chemical industries; and a business located in the United States that provides heavy, civil, industrial and energy related services and specializes in the construction and maintenance of pipelines and metering stations. The aggregate consideration for these acquisitions was $359.6 million paid or payable in cash (subject to certain adjustments) and 1,334,469 shares of Quanta common stock, which had a fair value of $57.1 million as of the respective acquisition dates. Additionally, one of the acquisitions includes the potential payment of up to approximately $6.9 million of contingent consideration, payable if the acquired business achieves certain performance objectives over a five-year post-acquisition period. Based on the estimated fair value of the contingent consideration, Quanta recorded a $2.3 million liability as of the acquisition date.

The results of the businesses acquired as of or prior to September 30, 2021 have been included in Quanta’s consolidated financial statements beginning on the respective acquisition dates, with the results of the manufacturing business, the industrial services business and the business specializing in construction and maintenance of pipelines and metering stations generally included in the Underground Utility and Infrastructure Solutions segment and the results of the remaining businesses generally included in the Electric Power Infrastructure Solutions segment.

The following table summarizes the aggregate consideration paid or payable as of September 30, 2021 for the acquisitions completed in the nine months ended September 30, 2021 and the year ended December 31, 2020 and presents the allocation of these amounts to net tangible and identifiable intangible assets based on their estimated fair values as of the respective acquisition dates, inclusive of any purchase price adjustments. These allocations require significant use of estimates and are based on information that was available to management at the time these condensed consolidated financial statements were prepared. Quanta uses a variety of information to estimate fair values, including quoted market prices, carrying amounts and valuation techniques such as discounted cash flows. When deemed appropriate, third-party appraisal firms are engaged to assist in fair value determination of fixed assets, intangible assets and certain other assets and liabilities.

Quanta is finalizing its fair value assessments for the acquired assets and assumed liabilities related to businesses acquired subsequent to September 30, 2020, and further adjustments to the purchase price allocations may occur. As of September 30, 2021, the estimated fair values of the net assets acquired were preliminary, with possible updates primarily related to tax estimates and inventory. Consideration amounts are also subject to the finalization of closing working capital adjustments. The aggregate consideration paid or payable for businesses acquired between September 30, 2020 and September 30, 2021 was allocated to acquired assets and assumed liabilities, which resulted in an allocation of $136.4 million to net tangible assets, $37.6 million to identifiable intangible assets and $35.3 million to goodwill. The following table summarizes the fair value of

total consideration transferred or estimated to be transferred and the fair value of assets acquired and liabilities assumed as of September 30, 2021 for acquisitions completed in the year-to-date periods shown below (in thousands).

	September 30, 2021		December 31, 2020
Consideration:
Cash paid or payable	$	59,226	$	359,624
Value of Quanta common stock issued	2,479		57,119
Contingent consideration	—		2,250
Fair value of total consideration transferred or estimated to be transferred	$	61,705	$	418,993
Accounts receivable	$	10,678	$	74,492
Contract assets	2,048		8,919
Other current assets	7,189		53,302
Property and equipment	5,651		143,276
Other assets	216		14
Identifiable intangible assets	18,506		96,827
Contract liabilities	(16)		(3,750)
Other current liabilities	(10,371)		(35,112)
Deferred tax liabilities, net	(2,093)		(3,185)
Total identifiable net assets	31,808		334,783
Goodwill	29,897		84,210
Fair value of net assets acquired	$	61,705	$	418,993

Goodwill represents the amount by which the purchase price for an acquired business exceeds the net fair value of the assets acquired and liabilities assumed. The acquisitions completed in the nine months ended September 30, 2021 and the year ended December 31, 2020 strategically expanded Quanta’s domestic and international underground utility and infrastructure solutions and domestic electric power infrastructure solutions, which Quanta believes contributes to the recognition of goodwill. Approximately $13.3 million and $72.6 million of goodwill is expected to be deductible for income tax purposes related to acquisitions completed in the nine months ended September 30, 2021 and the year ended December 31, 2020.

Quanta’s intangible assets include customer relationships; backlog; trade names; non-compete agreements; patented rights, developed technology, and process certifications; and curriculum, all of which are subject to amortization, as well as an engineering license, which is not subject to amortization. The following table summarizes the estimated fair values of identifiable intangible assets for the acquisitions completed in the nine months ended September 30, 2021 as of the acquisition

date and the related weighted average amortization periods by asset type (in thousands, except for weighted average amortization periods, which are in years).    

	Estimated Fair Value		Weighted Average Amortization Period in Years
Customer relationships	$	3,063	5.6
Backlog	3,811		1.3
Trade names	1,110		14.4
Non-compete agreements	1,494		5.0
Patented rights, developed technology, and process certifications	9,028		3.5
Total intangible assets subject to amortization	$	18,506	4.2

The significant estimates used by management in determining the fair value of customer relationship intangible assets include future revenues, discount rates and customer attrition rates. The following table includes the discount rates and customer attrition rates used to determine the fair value of customer relationship intangible assets for businesses acquired during the nine months ended September 30, 2021 and the year ended December 31, 2020 as of the respective acquisition dates:

	2021		2020
	Range	Weighted Average	Range	Weighted Average
Discount rates	22% to 25%	22%	19% to 25%	20%
Customer attrition rates	20% to 30%	23%	10% to 43%	13%

The following unaudited supplemental pro forma results of operations for Quanta, which incorporate the acquisitions completed in the three and nine months ended September 30, 2021 and 2020, have been provided for illustrative purposes only and do not purport to be indicative of the actual results that would have been achieved by the combined companies for the periods presented or that may be achieved by the combined companies in the future. Future results may vary significantly from the results reflected in the following pro forma financial information because of future events and transactions, as well as other factors (in thousands, except per share amounts).

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Revenues	$	3,357,877	$	3,069,921	$	9,090,656	$	8,519,226
Gross profit	$	535,935	$	520,866	$	1,367,256	$	1,254,826
Selling, general and administrative expenses	$	(275,363)	$	(256,608)	$	(794,249)	$	(740,564)
Amortization of intangible assets	$	(22,836)	$	(22,843)	$	(68,167)	$	(69,742)
Net income	$	175,865	$	166,326	$	387,713	$	287,171
Net income attributable to common stock	$	174,832	$	165,539	$	383,184	$	282,718
Earnings per share attributable to common stock:
Basic	$	1.25	$	1.17	$	2.73	$	1.98
Diluted	$	1.21	$	1.14	$	2.65	$	1.94

The pro forma combined results of operations for the three and nine months ended September 30, 2021 and 2020 were prepared by adjusting the historical results of Quanta to include the historical results of the acquisitions completed in 2021 as if they occurred January 1, 2020. The pro forma combined results of operations for the three and nine months ended September 30, 2020 were prepared by also adjusting the historical results of Quanta to include the historical results of the acquisitions completed in 2020 as if they occurred January 1, 2019. These pro forma combined historical results were adjusted for the following: a reduction of interest expense as a result of the repayment of outstanding indebtedness of the acquired businesses; an increase in interest expense as a result of the cash consideration paid; an increase in amortization expense due to the incremental intangible assets recorded; elimination of inter-company sales; changes in depreciation expense to adjust acquired property and equipment to the acquisition date fair value and to conform with Quanta’s accounting policies; an increase in the

number of outstanding shares of Quanta common stock; and reclassifications to conform the acquired businesses’ presentation to Quanta’s accounting policies. The pro forma combined results of operations do not include any adjustments to eliminate the impact of acquisition-related costs or any cost savings or other synergies that resulted or may result from the acquisitions. As noted above, the pro forma results of operations do not purport to be indicative of the actual results that would have been achieved by the combined company for the periods presented or that may be achieved by the combined company in the future.

Revenues of $13.4 million and a loss before income taxes of $0.3 million, which included $2.0 million of acquisition-related costs, related to the acquisitions completed in 2021 are included in Quanta’s condensed consolidated results of operations for the three months ended September 30, 2021. Revenues of $14.6 million and a loss before income taxes of $0.2 million, which included $2.4 million of acquisition-related costs, related to the acquisitions completed in 2021 are included in Quanta’s condensed consolidated results of operations for the nine months ended September 30, 2021. Revenues of $55.2 million and income before income taxes of $1.0 million, which included $10.6 million acquisition-related costs, related to the acquisitions completed in 2020 are included in Quanta’s condensed consolidated results of operations for the three months ended September 30, 2020. Revenues of $63.0 million and income before income taxes of $1.0 million, which included $11.4 million of acquisition-related costs, related to the acquisitions completed in 2020 are included in Quanta’s condensed consolidated results of operations for the nine months ended September 30, 2020.

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Per Share Information

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Per Share Information

PER SHARE INFORMATION:

The amounts used to compute basic and diluted earnings per share attributable to common stock consisted of the following (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Amounts attributable to common stock:
Net income attributable to common stock	$	174,365	$	162,913	$	381,159	$	275,545
Weighted average shares outstanding:
Weighted average shares outstanding for basic earnings per share attributable to common stock	140,008		140,542		140,134		141,610
Effect of dilutive unvested non-participating stock-based awards	4,296		3,821		4,314		3,375
Weighted average shares outstanding for diluted earnings per share attributable to common stock	144,304		144,363		144,448		144,985

Basic and diluted earnings per share attributable to common stock are computed using the weighted average number of shares of common stock outstanding during the applicable period. Unvested stock-based awards that contain non-forfeitable rights to dividends or dividend equivalents (participating securities) have been included in the calculation of basic and diluted earnings per share attributable to common stock for the portion of the periods that the awards were outstanding. Weighted average shares outstanding for basic and diluted earnings per share attributable to common stock included 0.5 million and 1.4 million weighted average participating securities for the three months ended September 30, 2021 and 2020 and 0.7 million and 1.7 million weighted average participating securities for the nine months ended September 30, 2021 and 2020.

For purposes of calculating diluted earnings per share attributable to common stock, there were no adjustments required to derive Quanta’s net income attributable to common stock. Diluted earnings per share attributable to common stock is computed using the weighted average number of shares of common stock outstanding during the period adjusted for all potentially dilutive common stock equivalents, except in cases where the effect of the common stock equivalents would be antidilutive.

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Debt Obligations

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Debt Obligations

DEBT OBLIGATIONS:

Quanta’s long-term debt obligations consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
0.950% Senior Notes due October 2024	$	500,000	$	—
2.900% Senior Notes due October 2030	1,000,000		1,000,000
2.350% Senior Notes due January 2032	500,000		—
3.050% Senior Notes due October 2041	500,000		—
Borrowings under senior credit facility	415,851		148,508
Other long-term debt	51,366		46,981
Finance leases	2,253		2,228
Unamortized discount and deferred financing costs related to senior notes	(28,289)		(12,892)
Total long-term debt obligations	2,941,181		1,184,825
Less — Current maturities of long-term debt	10,276		10,531
Total long-term debt obligations, net of current maturities	$	2,930,905	$	1,174,294

Quanta’s current maturities of long-term debt and short-term debt consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Short-term debt	$	13,472	$	4,233
Current maturities of long-term debt	10,276		10,531
Current maturities of long-term debt and short-term debt	$	23,748	$	14,764

Senior Notes

On September 23, 2021, Quanta issued $1.50 billion aggregate principal amount of senior notes consisting of: $500.0 million aggregate principal amount of 0.950% senior notes due October 2024 (the 2024 notes); $500.0 million aggregate principal amount of 2.350% senior notes due January 2032 (the 2032 notes); and $500.0 million aggregate principal amount of 3.050% senior notes due October 2041 (the 2041 notes). The cumulative proceeds received from the public offering of the 2024 notes, the 2032 notes and the 2041 notes were $1.48 billion, net of the original issue discount, underwriting discounts and deferred financing costs, which were used, along with drawings under Quanta’s senior credit facility, as amended, to acquire Blattner. Additionally, on September 22, 2020, Quanta issued $1.00 billion aggregate principal amount of 2.900% senior notes due October 2030 (the 2030 notes, and together with the 2024 notes, the 2032 notes and the 2041 notes, collectively the Senior Notes) and received proceeds of $986.7 million from the offering, net of the original issue discount, underwriting discounts and deferred financing costs.

Interest on the Senior Notes is payable semi-annually in arrears as set forth below (dollars in thousands).

Title of the Notes	Interest Amount		Payment Dates	Commencement Date
0.950% Senior Notes due October 2024	$	2,375	April 1 and October 1	April 1, 2022
2.900% Senior Notes due October 2030	$	14,500	April 1 and October 1	April 1, 2021
2.350% Senior Notes due January 2032	$	5,875	January 15 and July 15	July 15, 2022
3.050% Senior Notes due October 2041	$	7,625	April 1 and October 1	April 1, 2022

In each case as further specified by the terms of the Senior Notes and the indenture and supplemental indentures governing the Senior Notes (collectively, the indenture), Quanta may redeem all or a portion of (i) the 2024 notes at any time prior to October 1, 2022 at a price equal to 100% of the principal amount plus a make-whole premium and accrued and unpaid interest, and at any time on or after October 1, 2022 at a price equal to 100% of the principal amount plus accrued and unpaid interest; (ii) the 2030 notes at any time prior to July 1, 2030 at a price equal to 100% of the principal amount plus a make-whole premium and accrued and unpaid interest, and at any time on or after July 1, 2030 at a price equal to 100% of the principal amount plus accrued and unpaid interest; (iii) the 2032 notes at any time prior to October 15, 2031 at a price equal to 100% of the principal amount plus a make-whole premium and accrued and unpaid interest, and at any time on or after October 15, 2031

at a price equal to 100% of the principal amount plus accrued and unpaid interest; and (iv) the 2041 notes at any time prior to April 1, 2041 at a price equal to 100% of the principal amount plus a make-whole premium and accrued and unpaid interest, and at any time on or after April 1, 2041 at a price equal to 100% of the principal amount plus accrued and unpaid interest.

Upon the occurrence of a Change of Control Triggering Event (as defined in the indenture), unless Quanta has exercised its right to redeem the applicable series of Senior Notes in full by giving irrevocable notice to the trustee, each holder of such Senior Notes will have the right to require Quanta to purchase all or a portion of such holder’s Senior Notes of such series at a purchase price equal to 101% of the principal amount thereof plus accrued and unpaid interest.

The indenture contains covenants that, among other things, limit Quanta’s ability to incur liens securing certain indebtedness, to engage in certain sale and leaseback transactions with respect to certain properties and to sell all or substantially all of Quanta’s assets or merge or consolidate with or into other companies. The indenture also contains customary events of default.

Senior Credit Facility

October 2021 Amendment

On October 8, 2021, Quanta entered into an amendment to the credit agreement for its senior credit facility (the Amended Credit Agreement) that, among other things, (i) provided for a new $750.0 million term loan facility for the purpose of financing, in whole or in part, the acquisition of Blattner pursuant to the agreement and plan of merger, refinancing certain existing indebtedness of Blattner and paying certain related costs and expenses, (ii) increased the aggregate revolving commitments from $2.51 billion to $2.64 billion and (iii) extended the maturity date for revolving commitments under the senior credit facility from September 22, 2025 to October 8, 2026, which is also the maturity date for the new term loan facility. The amendment also increased the threshold amount for cross-defaults to certain debt instruments and for certain other purposes from $150.0 million to $300.0 million. After giving effect to the amendment, the aggregate amount of the credit facilities provided for under the Amended Credit Agreement is $3.39 billion.

On October 13, 2021, Quanta borrowed the full amount of the $750.0 million term loan facility and used such amount, together with the net proceeds from the September 2021 offering of the 2024 notes, the 2032 notes and the 2041 notes and approximately $50.9 million of revolving loans borrowed under the senior credit facility, to pay the cash consideration for the acquisition of Blattner, as further described in Note 4.

Quanta is required to make quarterly principal payments on the first business day of each January, April, July and October, beginning in January 2023, on outstanding borrowings under the new term loan facility in an amount equal to $4.7 million per quarter in 2023 and 2024, $9.4 million per quarter in 2025 and $18.8 million per quarter in 2026. The aggregate remaining principal amount outstanding for the new term loan facility must be paid on the maturity date of the senior credit facility. Quanta may voluntarily prepay the term loan borrowings from time to time, in whole or in part, without premium or penalty.

Amounts borrowed under the new term loan facility bear interest, at Quanta’s option, at a rate equal to either (a) the LIBOR Rate (as defined in the Amended Credit Agreement) plus 1.000% to 1.625%, or (b) the Base Rate (as defined below) plus 0.000% to 0.625%, each as determined based on either Quanta’s Consolidated Leverage Ratio (as described below) or Quanta’s Debt Rating (as defined in the Amended Credit Agreement), whichever is more favorable to Quanta. The Consolidated Leverage Ratio is the ratio of Quanta’s total funded debt to Consolidated EBITDA (as defined in the Amended Credit Agreement). For purposes of calculating the Consolidated Leverage Ratio, total funded debt is reduced by available cash and Cash Equivalents (as defined in the Amended Credit Agreement) in excess of $25.0 million. The Base Rate equals the highest of (i) the Federal Funds Rate (as defined in the Amended Credit Agreement) plus 0.5%, (ii) Bank of America’s prime rate and (iii) the LIBOR Rate plus 1.00%.

Beginning October 8, 2021, amounts borrowed in U.S. dollars under the revolving credit facility bear interest, at Quanta’s option, at a rate equal to either (a) the LIBOR Rate plus 1.125% to 1.750%, or (b) the Base Rate plus 0.125% to 0.750%, each as determined based on either Quanta’s Consolidated Leverage Ratio or its Debt Rating, whichever is more favorable to Quanta. Revolving loans borrowed in any currency other than U.S. dollars bear interest at a rate equal to the Alternative Currency Daily Rate or the Alternative Currency Term Rate (each as defined in the Amended Credit Agreement), as applicable, plus 1.125% to 1.750%, as determined based on either Quanta’s Consolidated Leverage Ratio or Quanta’s Debt Rating, whichever is more favorable to Quanta. Additionally, standby or commercial letters of credit issued under the Amended Credit Agreement are subject to a letter of credit fee of 1.125% to 1.750%; Performance Letters of Credit (as defined in the Amended Credit Agreement) issued under the Amended Credit Agreement in support of certain contractual obligations are subject to a letter of credit fee of 0.675% to 1.125%; and Quanta is subject to a commitment fee of 0.100% to 0.275% on any unused

availability under the revolving credit facility, in each case as determined based on either the Quanta’s Consolidated Leverage Ratio or its Debt Rating, whichever is more favorable to Quanta.

The Amended Credit Agreement contains certain covenants, including, as of the end of any fiscal quarter of Quanta, (i) a maximum Consolidated Leverage Ratio (as defined in the Amended Credit Agreement) of 3.5 to 1.0 (except that in connection with certain permitted acquisitions in excess of $200.0 million, including Quanta’s acquisition of Blattner, such ratio is 4.0 to 1.0 for the fiscal quarter in which the acquisition is completed and the four subsequent fiscal quarters) and (ii) a minimum Consolidated Interest Coverage Ratio (as defined in the Amended Credit Agreement) of 3.0 to 1.0.

As of and for the three and nine months ended September 30, 2021

As of September 30, 2021, Quanta had $415.9 million of outstanding revolving loans under its senior credit facility. Of the total outstanding borrowings, $239.7 million were denominated in Canadian dollars, $142.2 million were denominated in U.S. dollars and $34.0 million were denominated in Australian dollars. As of September 30, 2021, Quanta also had $333.9 million of letters of credit issued under the senior credit facility, of which $92.8 million were denominated in currencies other than the U.S. dollar, primarily Canadian dollars. As of September 30, 2021, subject to the applicable sublimits and other terms and conditions, the remaining $1.76 billion of available commitments under the senior credit facility was available for loans or issuing new letters of credit in U.S. dollars and certain alternative currencies.

Borrowings under the senior credit facility and the applicable interest rates were as follows (dollars in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2021			2020			2021			2020
Maximum amount outstanding	$	517,883		$	1,462,069		$	576,993		$	2,023,326
Average daily amount outstanding	$	416,089		$	1,255,171		$	360,609		$	1,395,207
Weighted-average interest rate	2.13		%	1.57		%	2.05		%	2.13		%

As of September 30, 2021, Quanta was in compliance with all of the financial covenants under its senior credit facility.

Bridge Facility Commitment

On September 1, 2021, in connection with the signing of the merger agreement for the acquisition of Blattner, Quanta entered into a commitment letter, pursuant to which certain lenders committed to provide a 364-day senior unsecured bridge facility in an aggregate principal amount of up to $2.18 billion to finance the cash consideration estimated to be due at closing of the acquisition of Blattner and to pay fees and expenses incurred in connection therewith. On September 23, 2021, in accordance with the terms of the commitment letter, the aggregate commitments under the commitment letter were reduced to approximately $696.1 million concurrently with Quanta’s issuance of the 2024 notes, the 2032 notes and the 2041 notes. Additionally, concurrent with the amendment to Quanta’s senior credit facility, the remaining aggregate commitments under the commitment letter were reduced to zero and the commitment was terminated.

During the three months ended September 30, 2021, Quanta paid $4.4 million of fees to the lenders related to the bridge facility commitment, $3.1 million of which was amortized to interest expense in the three months ended September 30, 2021 and $1.3 million of which was recorded as deferred financing costs as of September 30, 2021 and will be amortized to interest expense in the three months ending December 31, 2021.

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Leases

9 Months Ended

Sep. 30, 2021

Leases [Abstract]

Leases

LEASES:

Quanta primarily leases land, buildings, vehicles, construction equipment and office equipment. The components of lease costs in the accompanying condensed consolidated statements of operations are as follows (in thousands):

		Three Months Ended				Nine Months Ended
		September 30,				September 30,
Lease cost	Classification	2021		2020		2021		2020
Finance lease cost:
Amortization of lease assets	Depreciation (1)	$	231	$	53	$	705	$	515
Interest on lease liabilities	Interest expense	18		16		68		50
Operating lease cost	Cost of services and Selling, general and administrative expenses	25,323		29,577		80,046		89,289
Short-term and variable lease cost (2)	Cost of services and Selling, general and administrative expenses	176,605		160,365		494,846		478,683
Total lease cost		$	202,177	$	190,011	$	575,665	$	568,537

(1)    Depreciation is included within “Cost of services” and “Selling, general and administrative expenses” in the accompanying condensed consolidated statements of operations.

(2)    Short-term lease cost includes both leases and rentals with initial terms of one year or less. Variable lease cost is insignificant and primarily relates to real estate leases and consists of common area maintenance charges, real estate taxes, insurance and other variable costs.

Quanta has entered into arrangements with certain related parties to lease certain real property and facilities. Typically, the parties are employees of Quanta who are also the former owners of businesses acquired by Quanta, and the real properties and facilities continue to be utilized by Quanta subsequent to the acquisitions. Quanta utilizes third party market valuations to evaluate rental rates for these properties and facilities, and the lease agreements generally have remaining lease terms of up to 10 years, subject to renewal options. Related party lease expense was $2.4 million and $4.5 million for the three months ended September 30, 2021 and 2020 and $10.4 million and $13.2 million for the nine months ended September 30, 2021 and 2020.

Future minimum lease payments for operating and finance leases were as follows (in thousands):

	As of September 30, 2021
	Operating Leases		Finance Leases		Total
Remainder of 2021	$	23,964	$	296	$	24,260
2022	80,516		872		81,388
2023	58,265		666		58,931
2024	36,341		409		36,750
2025	24,449		126		24,575
Thereafter	36,996		—		36,996
Total future minimum operating and finance lease payments	$	260,531	$	2,369	$	262,900
Less imputed interest	(20,342)		(116)		(20,458)
Total lease liabilities	$	240,189	$	2,253	$	242,442

Future minimum lease payments for short-term leases, which are not recorded in the condensed consolidated balance sheets due to Quanta’s accounting policy election, were $18.7 million as of September 30, 2021. Month-to-month rental expense associated primarily with certain equipment rentals is excluded from these amounts because Quanta is unable to accurately predict future rental amounts.

The weighted average remaining lease terms and discount rates were as follows:

	As of September 30, 2021
Weighted average remaining lease term (in years):
Operating leases	4.16
Finance leases	2.90
Weighted average discount rate:
Operating leases	3.9	%
Finance leases	3.7	%

Quanta has also guaranteed the residual value under certain of its equipment operating leases, agreeing to pay any difference between this residual value and the fair market value of the underlying asset at the date of lease termination. As of September 30, 2021, the maximum guaranteed residual value of this equipment was $886.9 million. While Quanta believes that no significant payments will be made as a result of these residual value guarantees, there can be no assurance that significant payments will not be required in the future.

As of September 30, 2021, Quanta had additional operating lease obligations of $6.4 million for leases that had not yet commenced but that are expected to commence in 2021 and have lease terms of one to seven years.

Leases

LEASES:

Quanta primarily leases land, buildings, vehicles, construction equipment and office equipment. The components of lease costs in the accompanying condensed consolidated statements of operations are as follows (in thousands):

		Three Months Ended				Nine Months Ended
		September 30,				September 30,
Lease cost	Classification	2021		2020		2021		2020
Finance lease cost:
Amortization of lease assets	Depreciation (1)	$	231	$	53	$	705	$	515
Interest on lease liabilities	Interest expense	18		16		68		50
Operating lease cost	Cost of services and Selling, general and administrative expenses	25,323		29,577		80,046		89,289
Short-term and variable lease cost (2)	Cost of services and Selling, general and administrative expenses	176,605		160,365		494,846		478,683
Total lease cost		$	202,177	$	190,011	$	575,665	$	568,537

(1)    Depreciation is included within “Cost of services” and “Selling, general and administrative expenses” in the accompanying condensed consolidated statements of operations.

(2)    Short-term lease cost includes both leases and rentals with initial terms of one year or less. Variable lease cost is insignificant and primarily relates to real estate leases and consists of common area maintenance charges, real estate taxes, insurance and other variable costs.

Quanta has entered into arrangements with certain related parties to lease certain real property and facilities. Typically, the parties are employees of Quanta who are also the former owners of businesses acquired by Quanta, and the real properties and facilities continue to be utilized by Quanta subsequent to the acquisitions. Quanta utilizes third party market valuations to evaluate rental rates for these properties and facilities, and the lease agreements generally have remaining lease terms of up to 10 years, subject to renewal options. Related party lease expense was $2.4 million and $4.5 million for the three months ended September 30, 2021 and 2020 and $10.4 million and $13.2 million for the nine months ended September 30, 2021 and 2020.

Future minimum lease payments for operating and finance leases were as follows (in thousands):

	As of September 30, 2021
	Operating Leases		Finance Leases		Total
Remainder of 2021	$	23,964	$	296	$	24,260
2022	80,516		872		81,388
2023	58,265		666		58,931
2024	36,341		409		36,750
2025	24,449		126		24,575
Thereafter	36,996		—		36,996
Total future minimum operating and finance lease payments	$	260,531	$	2,369	$	262,900
Less imputed interest	(20,342)		(116)		(20,458)
Total lease liabilities	$	240,189	$	2,253	$	242,442

Future minimum lease payments for short-term leases, which are not recorded in the condensed consolidated balance sheets due to Quanta’s accounting policy election, were $18.7 million as of September 30, 2021. Month-to-month rental expense associated primarily with certain equipment rentals is excluded from these amounts because Quanta is unable to accurately predict future rental amounts.

The weighted average remaining lease terms and discount rates were as follows:

	As of September 30, 2021
Weighted average remaining lease term (in years):
Operating leases	4.16
Finance leases	2.90
Weighted average discount rate:
Operating leases	3.9	%
Finance leases	3.7	%

Quanta has also guaranteed the residual value under certain of its equipment operating leases, agreeing to pay any difference between this residual value and the fair market value of the underlying asset at the date of lease termination. As of September 30, 2021, the maximum guaranteed residual value of this equipment was $886.9 million. While Quanta believes that no significant payments will be made as a result of these residual value guarantees, there can be no assurance that significant payments will not be required in the future.

As of September 30, 2021, Quanta had additional operating lease obligations of $6.4 million for leases that had not yet commenced but that are expected to commence in 2021 and have lease terms of one to seven years.

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Equity

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Equity

EQUITY:

Stock repurchases

Quanta repurchased the following shares of common stock in the open market under the stock repurchase programs (in thousands):

Quarter ended:	Shares	Amount
September 30, 2021	185	$	16,828
June 30, 2021	314	$	29,450
March 31, 2021	222	$	17,710
December 31, 2020	720	$	49,949
September 30, 2020	—	$	—
June 30, 2020	—	$	—
March 31, 2020	5,960	$	200,000

As of September 30, 2021, Quanta is authorized to repurchase up to an additional $472.8 million in shares of common stock through June 30, 2023 under its existing stock repurchase program. Quanta’s policy is to record a stock repurchase as of the trade date; however, the payment of cash related to the repurchase is made on the settlement date of the trade. During the three months ended September 30, 2021 and 2020, cash payments related to stock repurchases were $17.8 million and none, and during the nine months ended September 30, 2021 and 2020, cash payments related to stock repurchases were $66.7 million and $200.0 million.

Dividends

Quanta declared the following cash dividends and cash dividend equivalents during 2020 and the first nine months of 2021 (in thousands, except per share amounts):

Declaration	Record	Payment	Dividend		Dividends
Date	Date	Date	Per Share		Declared
August 27, 2021	October 1, 2021	October 15, 2021	$	0.06	$	8,638
May 27, 2021	July 1, 2021	July 15, 2021	$	0.06	$	8,650
March 25, 2021	April 6, 2021	April 15, 2021	$	0.06	$	8,429
December 11, 2020	January 4, 2021	January 15, 2021	$	0.06	$	8,933
August 26, 2020	October 1, 2020	October 15, 2020	$	0.05	$	7,244
May 28, 2020	July 1, 2020	July 15, 2020	$	0.05	$	7,182
March 26, 2020	April 6, 2020	April 15, 2020	$	0.05	$	7,184

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Stock-Based Compensation

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Stock-Based Compensation

STOCK-BASED COMPENSATION:

Quanta has stock-based compensation awards outstanding under two equity incentive plans, the Quanta Services, Inc. 2011 Omnibus Equity Incentive Plan and the Quanta Services, Inc. 2019 Omnibus Equity Incentive Plan. For descriptions and further information regarding these plans, refer to Note 12 of the Notes to Consolidated Financial Statements in Item 8. Financial Statements and Supplementary Data in Part II of the 2020 Annual Report.

RSUs to be Settled in Common Stock

A summary of the activity for RSUs to be settled in common stock for the nine months ended September 30, 2021 and 2020 is set forth below (shares in thousands):

	2021		2020
	RSUs	Weighted Average Grant Date Fair Value (Per share)	RSUs	Weighted Average Grant Date Fair Value (Per share)
Unvested at January 1	3,869	$37.57	3,265	$35.34
Granted	945	$82.75	2,008	$39.65
Vested	(1,442)	$36.92	(1,228)	$35.68
Forfeited	(119)	$47.23	(114)	$36.26
Unvested at period ended September 30	3,253	$50.71	3,931	$37.41

The grant date fair value for RSUs to be settled in common stock is based on the closing price of Quanta’s common stock on the date of grant. The approximate fair values of RSUs settled in common stock during the nine months ended September 30, 2021 and 2020 were $121.7 million and $48.8 million.

During the nine months ended September 30, 2021 and 2020, Quanta recognized $48.8 million and $41.0 million of non-cash stock-based compensation expense related to RSUs to be settled in common stock. Such expense is recorded in “Selling, general and administrative expenses.” As of September 30, 2021, there was $101.0 million of total unrecognized compensation expense related to unvested RSUs to be settled in common stock granted to both employees and non-employees. This cost is expected to be recognized over a weighted average period of 2.21 years.

In October 2021, subsequent to Quanta’s acquisition of Blattner, Quanta granted 0.7 million RSUs to be settled in common stock, which had a fair market value of $72.3 million at the date of grant, to certain employees of Blattner that are continuing as employees after the acquisition. These awards are subject to forfeiture, restrictions on transfer and certain other conditions until vesting, which occurs in annual installments over periods ranging from five to ten years following the date of grant.

PSUs to be Settled in Common Stock

A summary of the activity for PSUs to be settled in common stock for the nine months ended September 30, 2021 and 2020 is set forth below (shares in thousands):

	2021		2020
	PSUs	Weighted Average Grant Date Fair Value (Per share)	PSUs	Weighted Average Grant Date Fair Value (Per share)
Unvested at January 1	1,047	$37.65	848	$33.20
Granted	174	$90.44	436	$34.59
Vested	(268)	$38.28	(238)	$17.48
Forfeited	(11)	$36.90	—	N/A
Unvested at September 30	942	$47.27	1,046	$37.35

The grant date fair value for PSUs is determined as follows: (i) for the portion of the awards based on company financial and operational performance metrics, by utilizing the closing price of Quanta’s common stock on the date of grant and (ii) for the portion of the awards based on total shareholder return, by utilizing a Monte Carlo simulation valuation methodology. The Monte Carlo simulation valuation methodology applied the following key inputs:

	2021		2020
Valuation date price based on March 25, 2021 and March 26, 2020 closing stock prices of Quanta common stock	$83.48		$31.49
Expected volatility	36	%	34	%
Risk-free interest rate	0.26	%	0.35	%
Term in years	2.77		2.76

During the nine months ended September 30, 2021 and 2020, Quanta recognized $15.4 million and $17.4 million in compensation expense associated with PSUs. Such expense is recorded in “Selling, general and administrative expenses.” During both the nine months ended September 30, 2021 and 2020, 0.5 million shares of common stock were earned and either issued or deferred for future issuance in connection with PSUs.

RSUs to be Settled in Cash

Compensation expense related to RSUs to be settled in cash was $13.7 million and $5.3 million for the nine months ended September 30, 2021 and 2020. Such expense is recorded in “Selling, general and administrative expenses.” RSUs that are anticipated to be settled in cash are not included in the calculation of weighted average shares outstanding for earnings per share, and the estimated earned value of such RSUs is classified as a liability. Quanta paid $13.2 million and $4.3 million to settle liabilities related to cash-settled RSUs in the nine months ended September 30, 2021 and 2020. Accrued liabilities for the estimated earned value of outstanding RSUs to be settled in cash were $7.4 million and $8.7 million at September 30, 2021 and December 31, 2020.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

COMMITMENTS AND CONTINGENCIES:

Investments in Affiliates and Other Entities

As described in Note 2, Quanta holds investments in various entities, including joint venture entities that provide infrastructure-related services under specific customer contracts and partially owned entities that own, operate and/or maintain certain infrastructure assets. As of September 30, 2021, Quanta had committed to contribute $13.6 million to certain new investments in joint venture entities. The timing of such contributions is not certain, but they are expected to occur in the next twelve months.

If losses are incurred by entities in which Quanta holds an interest, they are generally shared ratably based on the percentage ownership of the participants in the structures. However, in Quanta’s joint venture structures that provide infrastructure-related services, each participant is typically jointly and severally liable for all of the obligations of the joint venture entity pursuant to the contract with the customer, and therefore Quanta can be liable for full performance of the contract with the customer. Additionally, in circumstances where Quanta’s participation in a joint venture qualifies as a general

partnership, Quanta can be liable for all obligations of the joint venture, including obligations owed to the customer or any other person or entity. Quanta is not aware of circumstances that would lead to future claims against it for material amounts in connection with these liabilities. Additionally, typically each joint venture participant agrees to indemnify the other participant for any liabilities incurred in excess of what the other participant is obligated to bear under the respective joint venture agreement or in accordance with the scope of work subcontracted to each participant. It is possible, however, that Quanta could be required to pay or perform obligations in excess of its share if another participant is unable or refuses to pay or perform its share of the obligations. Quanta is not aware of circumstances that would lead to future claims against it for material amounts that would not be indemnified. However, to the extent any such claims arise, they could be material and could adversely affect Quanta’s consolidated business, financial condition, results of operations and cash flows.

Committed Expenditures

Quanta has capital commitments for the expansion of its equipment fleet in order to accommodate manufacturer lead times on certain types of vehicles. As of September 30, 2021, Quanta had $58.5 million of production orders with expected delivery dates in the fourth quarter of 2021 and $106.9 million of production orders with expected delivery dates in 2022, $68.4 million of which is anticipated to occur in the first half of 2022. Although Quanta has committed to purchase these vehicles at the time of their delivery, Quanta anticipates that the majority of these orders will be assigned to third party leasing companies and made available under certain master equipment lease agreements, thereby releasing Quanta from its equipment purchase commitments.

Legal Proceedings

Quanta is from time to time party to various lawsuits, claims and other legal proceedings that arise in the ordinary course of business. These actions typically seek, among other things, compensation for alleged personal injury, property damage, breach of contract, negligence or gross negligence, environmental liabilities, wage and hour and other employment-related damages, punitive damages, consequential damages, civil penalties or other losses, or injunctive or declaratory relief. With respect to all such lawsuits, claims and proceedings, Quanta records a reserve when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. In addition, Quanta discloses matters for which management believes a material loss is at least reasonably possible. Except as otherwise stated below, none of these proceedings are expected to have a material adverse effect on Quanta’s consolidated financial position, results of operations or cash flows. In all instances, management has assessed the matter based on current information and made a judgment concerning its potential outcome, giving due consideration to the nature of the claim, the amount and nature of damages sought and the probability of success. Management’s judgment may prove materially inaccurate, and such judgment is made subject to the known uncertainties of litigation.

Peru Project Dispute

In 2015, Redes Andinas de Comunicaciones S.R.L. (Redes), a majority-owned subsidiary of Quanta, entered into two separate contracts with an agency of the Peruvian Ministry of Transportation and Communications (MTC), currently Programa Nacional de Telecomunicaciones (PRONATEL), as successor to Fondo de Inversion en Telecomunicaciones (FITEL), pursuant to which Redes would design, construct and operate certain telecommunication networks in rural regions of Peru. The aggregate consideration provided for in the contracts was approximately $248 million, consisting of approximately $151 million to be paid during the construction period and approximately $97 million to be paid during a 10-year post-construction operation and maintenance period. At the beginning of the project, FITEL made advance payments totaling approximately $87 million to Redes, which were secured by two on-demand advance payment bonds posted by Redes to guarantee proper use of the payments in the execution of the project. Redes also provided two on-demand performance bonds in the aggregate amount of $25 million to secure performance of its obligations under the contracts.

During the construction phase, the project experienced numerous challenges and delays, primarily related to issues which Quanta believes were outside of the control of and not attributable to Redes, including, among others, weather-related issues, local opposition to the project, permitting delays, the inability to acquire clear title to certain required parcels of land and other delays which Quanta believes were attributable to FITEL/PRONATEL. In response to various of these challenges and delays, Redes requested and received multiple extensions to certain contractual deadlines and relief from related liquidated damages. However, in April 2019, PRONATEL provided notice to Redes claiming that Redes was in default under the contracts due to the delays and that PRONATEL would terminate the contracts if the alleged defaults were not cured. Redes responded by claiming that it was not in default, as the delays were due to events not attributable to Redes, and therefore PRONATEL was not entitled to terminate the contracts. PRONATEL subsequently terminated the contracts for alleged cause prior to completion of Redes’ scope of work, exercised the on-demand performance bonds and advance payment bonds against Redes, and indicated its intention to claim damages, including a verbal allegation of approximately $45 million of liquidated damages

under the contracts. In August 2020, Redes received a formal claim from PRONATEL for liquidated damages in the amount of approximately $38 million, which represents the U.S. dollar equivalent of the amount asserted based on the September 30, 2021 exchange rate.

In May 2019, Redes filed for arbitration before the Court of International Arbitration of the International Chamber of Commerce (ICC) against PRONATEL and the MTC. In the arbitration, Redes claims that PRONATEL: breached and wrongfully terminated the contracts; wrongfully executed the advance payment bonds and the performance bonds; and is not entitled to the alleged amount of liquidated damages. In addition, Redes is seeking compensation for all damages arising from PRONATEL’s actions, including but not limited to (i) repayment of the amounts collected by PRONATEL under the advance payment bonds and the performance bonds; (ii) payment of amounts owed for work completed by Redes under the contracts; (iii) lost income in connection with Redes’ future operation and maintenance of the networks; and (iv) other related costs and damages to Redes as a result of the breach and improper termination of the contracts (including construction costs caused by the delays and costs related to the transfer of the networks). The amount claimed by Redes in this arbitration is approximately $190 million. In May 2021, PRONATEL and the MTC filed their counter memorial and counterclaims in the ICC arbitration, requesting: (i) that Redes’ claims for breach of contract be rejected; (ii) a declaration that the execution of the advance payment bonds and the performance bonds was valid, and that the funds may be applied towards any debt owed by Redes; (iii) a declaration that the liquidated damages asserted by PRONATEL apply; (iv) that Redes’ claim for payment of amounts owed for work completed as a result of contractual reconciliation of balances be rejected and that any reconciliation of balances approved by the arbitration panel exclude the funds from the performance bonds; (v) that Redes’ claims for damages be rejected; (vi) a declaration that the contract terminations by PRONATEL were valid; and (vii) that Redes reimburse all funds it received from PRONATEL. In addition, PRONATEL alleges that Redes did not satisfy the contractual requirements for the transfer of the networks, which Redes disputes. In July 2021, Redes filed its statement of defense in reply to the counter memorial and counterclaims of PRONATEL and the MTC, in which it disputes all claims made by PRONATEL and the MTC and maintains the positions on its claims against PRONATEL and the MTC in the arbitration. In August 2021, PRONATEL and the MTC filed a rejoinder statement with their position on the merits and damages, which did not present any new claims, and in October 2021, Redes filed a rejoinder with respect to the counterclaims of PRONATEL and the MTC. The arbitration hearing on the merits is presently scheduled to take place in November 2021.

As of the date of the contract terminations, Redes had incurred costs of approximately $157 million related to the design and construction of the project and had received approximately $100 million of payments (inclusive of the approximately $87 million advance payments). Furthermore, upon completion of the transfer of the networks (as completed at the time of the contract terminations) to PRONATEL, which was required upon termination of the contracts and was completed in 2020, PRONATEL and the MTC are able to possess the networks, for which PRONATEL has paid approximately $100 million while also collecting approximately $112 million of bond proceeds. Quanta believes that PRONATEL’s actions represent an abuse of power and unfair and inequitable treatment and that PRONATEL and the MTC have been unjustly enriched. Specifically, under the terms of the contracts, the advance payment bonds were to be exercised only if it is determined that Redes did not use the advance payments for their intended purpose, in which case Redes would be obligated to return the portion of the advance payments not properly used. In connection with PRONATEL exercising the bonds, Redes was not afforded the opportunity to provide evidence of its proper use of the advance payments for project expenditures. Redes has incurred substantially more than the advance payment amounts in the execution of the project, and Quanta believes Redes has used the advance payment amounts for their intended purpose.

Quanta believes Redes is entitled to all amounts described in its claims above and intends to vigorously pursue those claims in the pending ICC arbitration proceeding. However, as a result of the contract terminations and the inherent uncertainty involved in arbitration proceedings and recovery of amounts owed, there can be no assurance that Redes will prevail on those claims or in defense of liquidated damages claims or any other claims asserted by PRONATEL. As a result, during the three months ended June 30, 2019, Quanta recorded a charge to earnings of $79.2 million, which included a reduction of previously recognized earnings on the project, a reserve against a portion of the project costs incurred through the project termination date, an accrual for a portion of the alleged liquidated damages, and the estimated costs to complete the project turnover and close out the project. The reduction of previously recognized earnings on the project included $14.5 million related to the correction of prior period errors associated with the determination of total estimated project costs and the resulting revenue recognized. Quanta assessed the materiality of the prior period errors and determined that the errors were immaterial individually and in the aggregate to its previously issued financial statements.

As of September 30, 2021, after taking into account the above charge, Quanta had a contract receivable of approximately $120 million related to the project, which includes the approximately $87 million PRONATEL collected through exercise of the advance payment bonds. The contract receivable from PRONATEL is included in “Other assets, net” in the accompanying condensed consolidated balance sheet as of September 30, 2021.

Quanta also reserves the right to seek full compensation for the loss of its investment under applicable legal regimes, including investment treaties and customary international law, as well as to seek resolution through direct discussions with PRONATEL or the MTC. In connection with these rights, in May 2020 Quanta’s Dutch subsidiary delivered to the Peruvian government an official notice of dispute arising from the termination of the contracts and related acts by PRONATEL (which are attributable to Peru) under the Agreement on the Encouragement and Reciprocal Protection of Investments between the Kingdom of the Netherlands and the Republic of Peru (Investment Treaty). The Investment Treaty protects Quanta’s subsidiary’s indirect ownership stake in Redes and the project, and provides for rights and remedies distinct from the ICC arbitration. In December 2020, Quanta’s Dutch subsidiary filed a request for the institution of an arbitration proceeding against Peru with the International Centre for Settlement of Investment Disputes (ICSID) related to Peru’s breach of the Investment Treaty, which was registered by ICSID in January 2021. In the ICSID arbitration, Quanta’s Dutch subsidiary claims, without limitation, that Peru: (i) treated the subsidiary’s investment in Redes and the project unfairly and inequitably; and (ii) effectively expropriated the subsidiary’s investment in Redes and the project. In addition, Quanta’s Dutch subsidiary is seeking full compensation for all damages arising from Peru’s actions, including but not limited to (i) the fair market value of the investment and/or lost profits; (ii) attorneys’ fees and arbitration costs; (iii) other related costs and damages and (iv) pre- and post-award interest.

If Quanta is not successful in the pending arbitration proceedings, including the ICC arbitration scheduled for November 2021, this matter could result in an additional significant loss that could have a material adverse effect on Quanta’s consolidated results of operations and cash flows. However, based on the information currently available and the status of the pending arbitration proceedings, Quanta is not able to determine a range of reasonably possible additional loss, if any, with respect to this matter.

Maurepas Project Dispute

During the third quarter of 2017, Maurepas Pipeline, LLC (Maurepas) notified QPS Engineering, LLC (QPS), a subsidiary of Quanta, of its claim for liquidated damages allegedly arising from delay in mechanical completion of a project in Louisiana. Quanta disputes the claim and believes that QPS is not responsible for liquidated damages under the contract terms, and in June 2019 QPS filed suit against SemGroup Corporation (now Energy Transfer LP), the parent company of Maurepas, under the parent guarantee issued to secure payment from Maurepas on the project. QPS is seeking to recover $22 million that it believes has been wrongfully withheld, which represents the maximum liability for liquidated damages pursuant to the contract terms. In July and August 2018, QPS also received notice from Maurepas claiming certain warranty defects on the project. In July 2019, Maurepas filed suit against QPS and Quanta, pursuant to a parent guarantee, for damages related to the alleged warranty defects and for a declaratory judgment related to the liquidated damages claim, subsequently claiming approximately $59 million in damages related to a portion of the alleged warranty defects. The lawsuits relating to these claims have been consolidated and are pending in the Tulsa County District Court in Oklahoma. Quanta is continuing to evaluate the claimed warranty defects and, if they exist, the appropriate remedy. At this time, Quanta disputes the extent of the alleged defects or has not been able to substantiate them.

As of September 30, 2021, Quanta had recorded an accrual with respect to this matter based on its current estimated amount of probable loss. Based on the information currently available, including documentation received in the discovery process, Quanta estimates the range of additional reasonably possible loss in connection with this matter is between no additional loss and the amount claimed by Maurepas with respect to the alleged warranty defects and liquidated damages, less the accrued amount. Upon final resolution of this matter, any liquidated damages or warranty defect damages in excess of Quanta’s current loss accrual would be recorded as additional costs on the project.

Lorenzo Benton v. Telecom Network Specialists, Inc., et al.

In June 2006, plaintiff Lorenzo Benton filed a class action complaint in the Superior Court of California, County of Los Angeles, alleging various wage and hour violations against Telecom Network Specialists (TNS), a former subsidiary of Quanta. Quanta retained liability associated with this matter pursuant to the terms of Quanta’s sale of TNS in December 2012. Benton represents a class of workers that includes all persons who worked on certain TNS projects, including individuals that TNS retained through numerous staffing agencies. The plaintiff class in this matter is seeking damages for unpaid wages, penalties associated with the failure to provide meal and rest periods and overtime wages, interest and attorneys’ fees. In January 2017, the trial court granted a summary judgment motion filed by the plaintiff class and found that TNS was a joint employer of the class members and that it failed to provide adequate meal and rest breaks and failed to pay overtime wages. During 2019 and 2020, the parties filed additional summary judgment and other motions and a bench trial on liability and damages was held. Liability and damages have been determined by the trial court, with the amount of liability for TNS, including interest through the date of the trial court’s orders, determined to be approximately $9.5 million. Quanta believes the court’s decisions on liability and damages are not supported by controlling law and continues to contest its liability and the damage calculation

asserted by the plaintiff class in this matter. The amount determined by the trial court includes damages and interest, but does not include attorneys’ fees or costs. In July 2021, the plaintiff class filed a motion for approval of approximately $37.0 million in attorneys’ fees, and in October 2021, Quanta filed a response to the motion opposing approval of substantially all of the claimed attorneys’ fees.

Additionally, in November 2007, TNS filed cross complaints for indemnity and breach of contract against the staffing agencies, which employed many of the individuals in question. In December 2012, the trial court heard cross-motions for summary judgment filed by TNS and the staffing agencies pertaining to TNS’s demand for indemnity. The court denied TNS’s motion and granted the motions filed by the staffing agencies; however, the California Appellate Court reversed the trial court’s decision in part and instructed the trial court to reconsider its ruling. In February 2017, the court denied a new motion for summary judgment filed by the staffing companies and has since stated that the staffing companies would be liable to TNS for any damages owed to the class members that the staffing companies employed. However, Quanta currently believes that, due to solvency issues, any contribution from the staffing companies may not be substantial.

The final amount of liability, if any, payable in connection with this matter remains the subject of pending litigation and will ultimately depend on various factors, including the outcome of Quanta’s appeal of the trial court’s rulings on liability and damages, a final determination with respect to any attorneys’ fees or additional costs or damages owed by Quanta, and the solvency of the staffing agencies. Based on review and analysis of the trial court’s rulings on liability, Quanta does not believe, at this time, that it is probable this matter will result in a material loss. However, if Quanta is unsuccessful in this litigation and the staffing agencies are unable to fund damages owed to class members, Quanta believes the range of reasonably possible loss to Quanta upon final resolution of this matter could be up to approximately $9.5 million, plus the final amount of any attorneys’ fees and expenses awarded to the plaintiff class.

Hallen Acquisition Assumed Liability

In August 2019, in connection with the acquisition of The Hallen Construction Co., Inc. (Hallen), Quanta assumed certain contingent liabilities associated with a March 2014 natural gas-fed explosion and fire in the Manhattan borough of New York City, New York. The incident resulted in, among other things, loss of life, personal injury and the destruction of two buildings and other property damage. After investigation, the National Transportation Safety Board determined that the probable cause of the incident was the failure of certain natural gas infrastructure installed by Consolidated Edison, Inc. (Con Ed) and the failure of certain sewer infrastructure maintained by the City of New York. Pursuant to a contract with Con Ed, Hallen had performed certain work related to such natural gas infrastructure and agreed to indemnify Con Ed for certain claims, liabilities and costs associated with its work. Numerous lawsuits are pending in New York state courts related to the incident, which generally name Con Ed, the City of New York and Hallen as defendants. These lawsuits are at various preliminary stages and generally seek unspecified damages and, in some cases, punitive damages, for wrongful death, personal injury, property damage and business interruption.

As of September 30, 2021, Quanta had not recorded an accrual related to this matter. Hallen’s liabilities associated with this matter are expected to be covered under applicable insurance policies or contractual remedies negotiated by Quanta with the former owners of Hallen. If a loss becomes probable and estimable with respect to this matter, Quanta expects to accrue its estimated liability and a receivable in the same amount. However, the ultimate amount of liability in connection with this matter remains subject to uncertainties associated with pending litigation, including, among other things, the apportionment of liability among the defendants and other responsible parties and the likelihood and amount of potential damages claims. As a result, this matter could result in a loss that is in excess of, or not covered by, such insurance or contractual remedies, which could have a material adverse effect on Quanta’s consolidated financial condition, results of operations and cash flows.

Concentrations of Credit Risk

Quanta is subject to concentrations of credit risk related primarily to its cash and cash equivalents and its net receivable position with customers, which includes amounts related to billed and unbilled accounts receivable and contract assets net of advanced billings with the same customer. Substantially all of Quanta’s cash and cash equivalents are managed by what it believes to be high credit quality financial institutions. In accordance with Quanta’s investment policies, these institutions are authorized to invest cash and cash equivalents in a diversified portfolio of what Quanta believes to be high quality cash and cash equivalent investments, which consist primarily of interest-bearing demand deposits, money market investments and money market mutual funds. Although Quanta does not currently believe the principal amount of these cash and cash equivalents is subject to any material risk of loss, changes in economic conditions could impact the interest income Quanta receives from these investments. In addition, Quanta grants credit under normal payment terms, generally without collateral, to its customers, which include electric power, communications and energy companies, governmental entities, general contractors, and builders, owners and managers of commercial and industrial properties located primarily in the United States, Canada and

Australia. While Quanta generally has certain statutory lien rights with respect to services provided, Quanta is subject to potential credit risk related to business, economic and financial market conditions that affect these customers and locations, which has been heightened as a result of the unfavorable and uncertain economic and financial market conditions resulting from the ongoing COVID-19 pandemic and the currently challenged energy market. Some of Quanta’s customers have experienced significant financial difficulties (including bankruptcy), and customers may experience financial difficulties in the future. These difficulties expose Quanta to increased risk related to collectability of billed and unbilled receivables and contract assets for services Quanta has performed.

For example, a customer within Quanta’s Underground Utility and Infrastructure Solutions segment encountered financial difficulties during 2020 that resulted in nonpayment of $27.5 million of receivables, plus accrued interest. As a result of the nonpayment, Quanta decided to foreclose the liens on the pipeline asset in order to recover the outstanding amount. During the three months ended September 30, 2021, Quanta entered into a settlement with the customer resulting in the sale of the pipeline asset to a third party and pursuant to which Quanta received $10.0 million of the amount owed and the right to receive payment of the remainder of the receivables in quarterly installments from the third party based on the cash flows generated by the pipeline and certain related assets. As a result, the remaining receivable balance of $17.5 million was reclassified to long-term receivables at September 30, 2021. Quanta also retained a security interest in the pipeline asset to secure payment of the remaining amount owed and believes that the value of the pipeline asset is in excess of such amount. However, the ultimate outcome with respect to the amount owed remains uncertain and is based on a number of assumptions that are potentially subject to change, including the future financial performance of the third party and the cash flows generated by the pipeline asset, as well as the future value of the pipeline asset. As a result, the amount ultimately collected could be materially less than the amount owed.

Additionally, in July 2021 Limetree Refining, a customer within Quanta’s Underground Utility and Infrastructure Solutions segment, filed for bankruptcy protection under Chapter 11 of the U.S. Bankruptcy Code, as amended, after experiencing operational and financial difficulties and shutting down operations at its refinery. See Note 2 for further information related to this customer.

At September 30, 2021, the net receivable position of one customer within Quanta’s Electric Power Infrastructure Solutions segment, when combined with the net receivable position of a joint venture in which such customer owns a 50% interest, represented 12% of Quanta’s consolidated net receivable position. At December 31, 2020, no customer represented 10% or more of Quanta’s consolidated net receivable position. No customer represented 10% or more of Quanta’s consolidated revenues for the three and nine months ended September 30, 2021 or 2020.

Insurance

Quanta is insured for, among other things, employer’s liability, workers’ compensation, auto liability, aviation and general liability claims. Quanta manages and maintains a portion of its casualty risk through its wholly-owned captive insurance company, which insures all claims up to the amount of the applicable deductible of its third-party insurance programs. Deductibles for the employer’s liability and workers’ compensation programs are $5.0 million per occurrence, and deductibles for the auto liability and general liability programs are $15.0 million per occurrence. Quanta also has employee health care benefit plans for most employees not subject to collective bargaining agreements, of which the primary plan is subject to a deductible of $0.8 million per claimant per year.

As of September 30, 2021 and December 31, 2020, the gross amount accrued for employer’s liability, workers’ compensation, auto liability, general liability, and group health claims totaled $316.8 million and $319.5 million, with $232.8 million and $238.0 million considered to be long-term and included in “Insurance and other non-current liabilities.” Related insurance recoveries/receivables as of September 30, 2021 and December 31, 2020 were $26.1 million and $35.6 million, of which $0.4 million and $0.4 million are included in “Prepaid expenses and other current assets” and $25.7 million and $35.2 million are included in “Other assets, net.”

Quanta renews its insurance policies on an annual basis, and therefore deductibles and levels of insurance coverage may change in future periods. In addition, insurers may cancel Quanta’s coverage or determine to exclude certain items from coverage, including wildfires, or Quanta may elect not to obtain certain types or incremental levels of insurance based on the potential benefits considered relative to the cost of such insurance, or coverage may not be available at reasonable and competitive rates. In any such event, Quanta’s overall risk exposure would increase, which could negatively affect its results of operations, financial condition and cash flows. For example, due to the increased occurrence and future risk of wildfires in California and other areas in the western United States, Australia and other locations, insurers have reduced coverage availability and increased the cost of insurance coverage for such events in recent years. As a result, Quanta’s level of insurance coverage for wildfire events has decreased, including in connection with recent annual insurance renewals, and the current level

of coverage may not be sufficient to cover potential losses in connection with these events. Additionally, Quanta’s third-party insurers could decide to further reduce, exclude or increase the cost of coverage for wildfires or other events in connection with insurance renewals in the future.

Letters of Credit

Certain of Quanta’s vendors require letters of credit to ensure reimbursement for amounts they are disbursing on Quanta’s behalf, such as to beneficiaries under its insurance programs. In addition, from time to time, certain customers require Quanta to post letters of credit to ensure payment of subcontractors and vendors and guarantee performance under contracts. Such letters of credit are generally issued by a bank or similar financial institution, typically pursuant to Quanta’s senior credit facility. Each letter of credit commits the issuer to pay specified amounts to the holder of the letter of credit if the holder claims that Quanta has failed to perform specified actions. If this were to occur, Quanta would be required to reimburse the issuer of the letter of credit. Depending on the circumstances of such a reimbursement, Quanta may also be required to record a charge to earnings for the reimbursement.

As of September 30, 2021, Quanta had $333.9 million in outstanding letters of credit under its senior credit facility securing its casualty insurance program and various other contractual commitments. These are irrevocable stand-by letters of credit with maturities generally expiring at various times throughout 2021 and 2022. Quanta expects to renew the majority of the letters of credit related to the casualty insurance program for subsequent one-year periods upon their maturity. Quanta is not aware of any claims currently asserted or threatened under any of these letters of credit that are material, individually or in the aggregate. However, to the extent payment is required for any such claims, the amount paid could be material and could adversely affect Quanta’s consolidated business, financial condition, results of operations and cash flows.

Bonds and Parent Guarantees

Many customers, particularly in connection with new construction, require Quanta to post performance and payment bonds. These bonds provide a guarantee that Quanta will perform under the terms of a contract and pay its subcontractors and vendors. In certain circumstances, the customer may demand that the surety make payments or provide services under the bond, and Quanta must reimburse the surety for any expenses or outlays it incurs. Quanta may also be required to post letters of credit in favor of the sureties, which would reduce the borrowing availability under its senior credit facility. Quanta has not been required to make any material reimbursements to its sureties for bond-related costs except in connection with the exercise of approximately $112 million advance payment and performance bonds in 2019 related to the terminated telecommunications project in Peru, as set forth in Legal Proceedings - Peru Project Dispute above. However, to the extent further reimbursements are required, the amounts could be material and could adversely affect Quanta’s consolidated business, financial condition, results of operations and cash flows. As of September 30, 2021, Quanta is not aware of any outstanding material obligations for payments related to bond obligations.

Performance bonds expire at various times ranging from mechanical completion of a project to a period extending beyond contract completion in certain circumstances, and therefore a determination of maximum potential amounts outstanding requires certain estimates and assumptions. Such amounts can also fluctuate from period to period based upon the mix and level of Quanta’s bonded operating activity. As of September 30, 2021, the total amount of the outstanding performance bonds was estimated to be approximately $3.8 billion. Quanta’s estimated maximum exposure related to the value of the performance bonds outstanding is lowered on each bonded project as the cost to complete is reduced, and each commitment under a performance bond generally extinguishes concurrently with the expiration of its related contractual obligation. The estimated cost to complete these bonded projects was approximately $1.1 billion as of September 30, 2021.

Additionally, from time to time, Quanta guarantees certain obligations and liabilities of its subsidiaries that may arise in connection with, among other things, contracts with customers, equipment lease obligations, joint venture arrangements and contractor licenses. These guarantees may cover all of the subsidiary’s unperformed, undischarged and unreleased obligations and liabilities under or in connection with the relevant agreement. For example, with respect to customer contracts, a guarantee may cover a variety of obligations and liabilities arising during the ordinary course of the subsidiary’s business or operations, including, among other things, warranty and breach of contract claims, third party and environmental liabilities arising from the subsidiary’s work and for which it is responsible, liquidated damages, or indemnity claims. Quanta is not aware of any claims under any guarantees that are material, except as set forth in Legal Proceedings – Maurepas Project Dispute above. To the extent a subsidiary incurs a material obligation or liability and Quanta has guaranteed the performance or payment of such obligation or liability, the recovery by a customer or other counterparty or a third party will not be limited to the assets of the subsidiary. As a result, responsibility under the guarantee could exceed the amount recoverable from the subsidiary alone and could materially and adversely affect Quanta’s consolidated business, financial condition, results of operations and cash flows.

Collective Bargaining Agreements and Multiemployer Pension Plans

Certain of Quanta’s operating units are parties to collective bargaining agreements with unions that represent certain of their employees. The collective bargaining agreements expire at various times and have typically been renegotiated and renewed on terms similar to those in the expiring agreements. From time to time, Quanta is a party to grievance and arbitration actions based on claims arising out of the collective bargaining agreements. The agreements require the operating units to pay specified wages, provide certain benefits to union employees and contribute certain amounts to multiemployer pension plans and employee benefit trusts. Quanta’s multiemployer pension plan contribution rates generally are made to the plans on a “pay-as-you-go” basis based on its union employee payrolls. The location and number of union employees that Quanta employs at any given time and the plans in which they may participate vary depending on Quanta’s need for union resources in connection with its ongoing projects. Therefore, Quanta is unable to accurately predict its union employee payroll and the resulting multiemployer pension plan contribution obligations for future periods.

The Pension Protection Act of 2006 may require Quanta to make additional contributions to its multiemployer pension plans if they become underfunded, and these additional contributions will be determined based on Quanta’s union employee payrolls. Certain plans to which Quanta contributes or may contribute in the future may adopt measures to improve their funded status through a funding improvement or rehabilitation plan, as applicable, which may require additional contributions from employers (e.g., a surcharge on benefit contributions) and/or modifications to retiree benefits. The amount, if any, that Quanta may be obligated to contribute to these plans cannot be reasonably estimated due to uncertainty regarding the amount of future work involving covered union employees, future contribution levels and possible surcharges on plan contributions.

Quanta may be subject to additional liabilities imposed by law as a result of its participation in multiemployer defined benefit pension plans. These liabilities may include an allocable share of the unfunded vested benefits in the plan for all plan participants, not only the benefits payable to a contributing employer’s own retirees. As a result, participating employers may bear a higher proportion of liability for unfunded vested benefits if other participating employers cease to contribute or withdraw, with the reallocation of liability being more acute in cases when a withdrawn employer is insolvent or otherwise fails to pay its withdrawal liability. Quanta is not aware of any material withdrawal liabilities that have been incurred or asserted and that remain outstanding as a result of a withdrawal by Quanta from a multiemployer defined benefit pension plan. However, Quanta’s future contribution obligations and potential withdrawal liability exposure could vary based on the investment and actuarial performance of the multiemployer pension plans to which it contributes and other factors, which could be negatively impacted as a result of the unfavorable and uncertain economic and financial market conditions resulting from the ongoing COVID-19 pandemic and related issues. Quanta has been subject to significant withdrawal liabilities in the past, including in connection with its withdrawal from the Central States, Southeast and Southwest Areas Pension Plan. To the extent Quanta is subject to material withdrawal liabilities in the future, such liability could adversely affect its business, financial condition, results of operations and cash flows.

Deferred Compensation Plans

Quanta made matching contributions to the eligible participants’ accounts under deferred compensation plans of $0.2 million during each the three months ended September 30, 2021 and 2020. Quanta made matching contributions to the eligible participants’ accounts under the deferred compensation plans of $1.0 million during each the nine months ended September 30, 2021 and 2020. Quanta made no discretionary contributions during the nine months ended September 30, 2021 and 2020. At September 30, 2021 and December 31, 2020, obligations under these plans, including amounts contributed by Quanta, were $69.1 million and $58.2 million, the majority of which were included in “Insurance and other non-current liabilities” in the accompanying condensed consolidated balance sheets. Quanta maintains investments to contribute to future obligations related to these deferred compensation plans. At September 30, 2021 and December 31, 2020, these investments were primarily comprised of company-owned life insurance policies, had fair market values of $68.4 million and $56.5 million and were included in “Other assets, net” in the accompanying condensed consolidated balance sheets.

During the three months ended September 30, 2021 and 2020, the fair market value of assets associated with our deferred compensation plan decreased $0.2 million and increased $2.8 million. During the nine months ended September 30, 2021 and 2020, the fair market value of assets associated with our deferred compensation plan increased $5.3 million and $1.9 million. These changes in fair market value of the assets are recorded in “Other income (expense), net” and were largely offset by corresponding changes in the fair market value of the liabilities associated with our deferred compensation plan, which are recorded in “Selling, general and administrative expenses.” During the three months ended September 30, 2021 and 2020, the fair market value of deferred compensation liabilities did not change and increased $3.3 million. During the nine months ended September 30, 2021 and 2020, the fair market value of deferred compensation liabilities increased $6.0 million and $1.9 million.

Indemnities

Quanta generally indemnifies its customers for the services it provides under its contracts and other specified liabilities, which may subject Quanta to indemnity claims and liabilities and related litigation. Additionally, in connection with certain acquisitions and dispositions, Quanta has indemnified various parties against specified liabilities that those parties might incur in the future. The indemnities under acquisition or disposition agreements are usually contingent upon the other party incurring liabilities that reach specified thresholds. Quanta is not aware of any indemnity claims in connection with its indemnity obligations that are material. However, to the extent indemnification is required, the amount could adversely affect Quanta’s consolidated business, financial condition, results of operations and cash flows.

In the normal course of Quanta’s acquisition transactions, Quanta obtains rights to indemnification from the sellers or former owners of acquired businesses for certain risks, liabilities and obligations arising from their operations prior to the date of acquisition, such as performance, operational, safety, workforce or tax issues, some of which Quanta may not have discovered during due diligence. However, the indemnities may not cover all of Quanta’s exposure for such pre-acquisition matters, or the indemnitors may be unwilling or unable to pay amounts owed to Quanta. Accordingly, Quanta may incur expenses for which it is not reimbursed, and such amounts could be material and could have a material adverse effect on Quanta’s business or consolidated financial condition, results of operations and cash flows. For example, Quanta has obtained certain indemnification rights from the former owners of Hallen with respect to contingent liabilities that were assumed in connection with the acquisition, as set forth in Legal Proceedings — Hallen Acquisition Assumed Liability above.

Residual Value Guarantees

Quanta has also guaranteed the residual value under certain of its equipment operating leases, agreeing to pay any difference between this residual value and the fair market value of the underlying asset at the date of lease termination. As of September 30, 2021, the maximum guaranteed residual value of this equipment was $886.9 million. While Quanta believes that no significant payments will be made as a result of these residual value guarantees, there can be no assurance that significant payments will not be required in the future.

Deferral of Employer Payroll Taxes

During 2020, the U.S. federal government enacted the Coronavirus Aid, Relief, and Economic Security Act (the CARES Act), which provided for various tax relief and tax incentive measures. These measures did not have a material impact on Quanta’s results of operations. However, pursuant to the CARES Act, Quanta deferred the payment of $108.9 million of employer payroll taxes during the year ended December 31, 2020, 50% of which are due to be paid by December 31, 2021 and the remainder is due by December 31, 2022.

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Segment Information

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Segment Information

SEGMENT INFORMATION:

Quanta currently presents its operations under two reportable segments: (1) Electric Power Infrastructure Solutions and (2) Underground Utility and Infrastructure Solutions. This structure is generally based on the broad end-user markets for Quanta’s services. See Note 1 for additional information regarding Quanta’s reportable segments.

Quanta’s segment results are derived from the types of services provided across its operating units in each of its end user markets. Quanta’s entrepreneurial business model allows multiple operating units to serve the same or similar customers and to provide a range of services across end user markets. Quanta’s operating units are organized into one of two internal divisions: the Electric Power Infrastructure Solutions Division and the Underground Utility and Infrastructure Solutions Division. These internal divisions are closely aligned with the reportable segments, and operating units are assigned to divisions based on the predominant type of work performed.

Reportable segment information, including revenues and operating income by type of work, is gathered from each operating unit for the purpose of evaluating segment performance in support of Quanta’s market strategies. Classification of operating unit revenues by type of work for segment reporting purposes can require judgment on the part of management. Quanta’s operating units may perform joint projects for customers in multiple industries, deliver multiple types of services under a single customer contract or provide service offerings to various industries. For example, Quanta performs joint trenching projects to install distribution lines for electric power and natural gas customers.

In addition, Quanta’s integrated operations and common administrative support for its operating units require that certain allocations be made to determine segment profitability, including allocations of shared and indirect costs (e.g., facility costs), indirect operating expenses (e.g., depreciation), and general and administrative costs. Certain corporate costs are not allocated

and include payroll and benefits, employee travel expenses, facility costs, professional fees, acquisition costs and amortization related to intangible assets.

Summarized financial information for Quanta’s reportable segments is presented in the following table (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Revenues:
Electric Power Infrastructure Solutions	$	2,328,468	$	2,107,621	$	6,536,363	$	5,667,566
Underground Utility and Infrastructure Solutions	1,024,810		912,540		2,520,312		2,622,921
Consolidated revenues	$	3,353,278	$	3,020,161	$	9,056,675	$	8,290,487
Operating income (loss):
Electric Power Infrastructure Solutions (1)(2)	$	288,283	$	268,376	$	724,217	$	581,030
Underground Utility and Infrastructure Solutions	68,167		76,220		100,917		128,747
Corporate and Non-Allocated Costs	(108,373)		(102,381)		(301,677)		(273,909)
Consolidated operating income	$	248,077	$	242,215	$	523,457	$	435,868
Depreciation:
Electric Power Infrastructure Solutions	$	37,196	$	30,637	$	110,925	$	88,337
Underground Utility and Infrastructure Solutions	20,958		21,313		63,183		64,280
Corporate and Non-Allocated Costs	3,462		4,294		12,372		12,563
Consolidated depreciation	$	61,616	$	56,244	$	186,480	$	165,180

(1)    As of December 31, 2020, Quanta had substantially completed the exit of its operations in Latin America. For the three and nine months ended September 30, 2020, operating income for the Electric Power Infrastructure Solutions segment included $15.4 million and $46.9 million of operating losses related to Latin American operations.

(2)    Operating income for the Electric Power Infrastructure Solutions segment includes equity in earnings of integral unconsolidated affiliates that are operationally integral to the operations of Quanta, which primarily consists of equity in earnings related to Quanta’s equity interest in LUMA.

Separate measures of Quanta’s assets and cash flows by reportable segment, including capital expenditures, are not produced or utilized by management to evaluate segment performance. Quanta’s fixed assets, which are held at the operating unit level, include operating machinery, equipment and vehicles, office equipment, buildings and leasehold improvements, and certain units are used on an interchangeable basis across its reportable segments. As such, for reporting purposes, total depreciation expense is allocated each quarter among Quanta’s reportable segments based on the ratio of each reportable segment’s revenue contribution to consolidated revenues.

Foreign Operations

During the three months ended September 30, 2021 and 2020, Quanta derived $460.8 million and $390.6 million of its revenues from foreign operations. During the nine months ended September 30, 2021 and 2020, Quanta derived $1.39 billion and $1.18 billion of its revenues from foreign operations. Of Quanta’s foreign revenues, 83% and 82% were earned in Canada during the three months ended September 30, 2021 and 2020 and 81% and 77% were earned in Canada during the nine months ended September 30, 2021 and 2020. In addition, Quanta held property and equipment of $317.6 million and $336.4 million in foreign countries, primarily Canada, as of September 30, 2021 and December 31, 2020.

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Supplemental Cash Flow Information

9 Months Ended

Sep. 30, 2021

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

SUPPLEMENTAL CASH FLOW INFORMATION:

The net effects of changes in operating assets and liabilities, net of non-cash transactions, on cash flows from operating activities are as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Accounts and notes receivable	$	(411,890)	$	(322,579)	$	(299,857)	$	37,541
Contract assets	(96,423)		21,950		(308,849)		121,999
Inventories	5		8,655		(6,139)		6,787
Prepaid expenses and other current assets	37,406		19,655		(4,943)		70,133
Accounts payable and accrued expenses and other non-current liabilities	230,631		235,633		289,833		147,888
Contract liabilities	(1,397)		(79,964)		(27,027)		(73,567)
Other, net	(6,027)		(7,813)		(15,205)		(20,066)
Net change in operating assets and liabilities, net of non-cash transactions	$	(247,695)	$	(124,463)	$	(372,187)	$	290,715

Reconciliations of cash, cash equivalents, and restricted cash reported within the condensed consolidated balance sheets that sum to the total of such amounts shown in the statements of cash flows are as follows (in thousands):

	September 30,
	2021		2020
Cash and cash equivalents	$	1,696,210	$	216,935
Restricted cash included in “Prepaid expenses and other current assets”	2,108		1,252
Restricted cash included in “Other assets, net”	778		915
Total cash, cash equivalents, and restricted cash reported in the statements of cash flows	$	1,699,096	$	219,102

	June 30,
	2021		2020
Cash and cash equivalents	$	212,473	$	530,670
Restricted cash included in “Prepaid expenses and other current assets”	1,460		1,266
Restricted cash included in “Other assets, net”	782		917
Total cash, cash equivalents, and restricted cash reported in the statements of cash flows	$	214,715	$	532,853

	December 31,
	2020		2019
Cash and cash equivalents	$	184,620	$	164,798
Restricted cash included in “Prepaid expenses and other current assets”	1,275		4,026
Restricted cash included in “Other assets, net”	913		921
Total cash, cash equivalents, and restricted cash reported in the statements of cash flows	$	186,808	$	169,745

Restricted cash includes any cash that is legally restricted as to withdrawal or usage.

Supplemental cash flow information related to leases and rental purchase options is as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	(25,331)	$	(29,333)	$	(79,730)	$	(88,570)
Operating cash flows from finance leases	$	(18)	$	(16)	$	(68)	$	(50)
Financing cash flows from finance leases	$	(168)	$	(102)	$	(688)	$	(525)
Lease assets obtained in exchange for lease liabilities:
Operating leases	$	17,081	$	16,619	$	41,686	$	56,970
Finance leases	$	112	$	275	$	398	$	1,158
Rental purchase option assets obtained in exchange for rental purchase option liabilities	$	1,129	$	3,306	$	7,009	$	13,229

Additional supplemental cash flow information is as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Cash (paid) received during the period for —
Interest paid	$	(2,260)	$	(8,443)	$	(26,883)	$	(30,704)
Income taxes paid	$	(35,740)	$	(86,077)	$	(103,225)	$	(149,690)
Income tax refunds	$	2,419	$	1,087	$	9,211	$	5,545

During the nine months ended September 30, 2020, in connection with the disposition of a small business, Quanta recorded a note receivable in exchange for the transfer of $8.5 million of inventory.

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Subsequent Event

9 Months Ended

Sep. 30, 2021

Subsequent Events [Abstract]

SUBSEQUENT EVENT

SUBSEQUENT EVENTS:

On October 13, 2021, Quanta completed the acquisition of Blattner, a large utility-scale renewable energy infrastructure solutions provider located in North America. The consideration for this transaction, which remains subject to certain post-closing adjustments, consisted of approximately $2.29 billion paid in cash on the date of acquisition and 3.3 million shares of Quanta common stock, which had a fair value of $345.4 million as of the date of the acquisition. See Note 1 and Note 4 for additional information on Blattner and Quanta’s acquisition of Blattner. Additionally, on October 8, 2021, Quanta amended its senior credit facility to, among other things, provide for a new $750.0 million term loan facility, increase the aggregate revolving commitments from $2.51 billion to $2.64 billion and extend the maturity date for the revolving commitments from September 2025 to October 2026. Quanta used proceeds from the new term loan, together with the net proceeds from its offering of senior notes in September 2021 and revolving loans borrowed under the senior credit facility, to finance the cash portion of the consideration paid in connection with the acquisition of Blattner. See Note 6 for additional information regarding the amendment to Quanta’s senior credit facility.

In October 2021, Quanta also acquired (i) a 44% interest in an entity that will be accounted for as an integral affiliate using the equity method of accounting and (ii) a business located in the United States that provides electric power construction and related services. See Note 2 and Note 4 for additional information on this investment and acquisition.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Principles of Consolidation

The condensed consolidated financial statements of Quanta include the accounts of Quanta Services, Inc. and its wholly-owned subsidiaries, which are also referred to as its operating units. The condensed consolidated financial statements also include the accounts of certain of Quanta’s investments in joint ventures, which are either consolidated or proportionately consolidated. Investments in affiliated entities in which Quanta does not have a controlling financial interest, but over which Quanta has significant influence, usually because Quanta holds a voting interest of between 20% and 50% in the affiliated entity, are accounted for using the equity method. Unless the context requires otherwise, references to Quanta include Quanta Services, Inc. and its consolidated subsidiaries.

Interim Condensed Consolidated Financial Information

These unaudited condensed consolidated financial statements have been prepared pursuant to the rules of the U.S. Securities and Exchange Commission (SEC). Certain information and footnote disclosures, normally included in annual financial statements prepared in accordance with generally accepted accounting principles in the United States (GAAP), have been condensed or omitted pursuant to those rules and regulations. Quanta believes that the disclosures made are adequate to make the information presented not misleading. In the opinion of management, all adjustments, consisting only of normal recurring adjustments, necessary to fairly state the financial position, results of operations, comprehensive income and cash flows with respect to the interim condensed consolidated financial statements have been included. The results of operations and comprehensive income for the interim periods are not necessarily indicative of the results for the entire fiscal year. The results of Quanta have historically been subject to significant seasonal fluctuations.

Use of Estimates and Assumptions

The preparation of financial statements in conformity with GAAP requires the use of estimates and assumptions by management in determining the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities known to exist as of the date the financial statements are published, and the reported amounts of revenues and expenses recognized during the periods presented. Quanta reviews all significant estimates affecting its consolidated financial statements on a recurring basis and records the effect of any necessary adjustments prior to their publication. Judgments and estimates are based on Quanta’s beliefs and assumptions derived from information available at the time such judgments and estimates are made. Uncertainties with respect to such estimates and assumptions are inherent in the preparation of financial statements. Estimates are primarily used in Quanta’s assessment of revenue recognition for construction contracts, including contractual change orders and claims; allowance for credit losses; valuation of inventory; useful lives of assets; fair value assumptions in analyzing goodwill, other intangibles and long-lived asset impairments; equity and other investments; purchase price allocations; acquisition-related contingent consideration liabilities; multiemployer pension plan withdrawal liabilities; contingent liabilities associated with, among other things, legal proceedings and claims, parent guarantees and indemnity obligations; estimated insurance claim recoveries; stock-based compensation; operating results of reportable segments; provision for income taxes; and uncertain tax positions.

Revenue Recognition

Quanta’s services may be provided pursuant to master service agreements (MSAs), repair and maintenance contracts and fixed price and non-fixed price construction contracts. These contracts are classified into three categories based on the methods by which transaction prices are determined and revenue is recognized: unit-price contracts, cost-plus contracts and fixed price contracts. Transaction prices for unit-price contracts are determined on a per unit basis, transaction prices for cost-plus contracts are determined by applying a profit margin to costs incurred on the contracts and transaction prices for fixed price contracts are determined on a lump-sum basis.

Performance Obligations

At September 30, 2021 and December 31, 2020, the aggregate transaction price allocated to unsatisfied or partially satisfied performance obligations was approximately $4.37 billion and $3.99 billion, of which 78.7% and 71.2% were expected to be recognized in the subsequent twelve months. These amounts represent management’s estimates of the consolidated revenues that are expected to be realized from the remaining portion of firm orders under fixed price contracts not yet completed or for which work had not yet begun as of such dates. For purposes of calculating remaining performance

obligations, Quanta includes all estimated revenues attributable to consolidated joint ventures and variable interest entities, revenues from funded and unfunded portions of government contracts to the extent they are reasonably expected to be realized and revenues from change orders and claims to the extent management believes additional contract revenues will be earned and are deemed probable of collection. Excluded from remaining performance obligations are potential orders under MSAs and non-fixed price contracts expected to be completed within one year.

Contract Estimates

Actual revenues and project costs can vary, sometimes substantially, from previous estimates due to changes in a variety of factors, including unforeseen or changed circumstances not included in Quanta’s cost estimates or covered by its contracts. Some of the factors that can result in positive changes in estimates on projects include successful execution through project risks, reduction of estimated project costs or increases of estimated revenues. Some of the factors that can result in negative changes in estimates include concealed or unknown site conditions; changes to or disputes with customers regarding the scope of services; changes in estimates related to the length of time to complete a performance obligation; changes or delays with respect to permitting and regulatory requirements; changes in the cost or availability of equipment, commodities, materials or skilled labor; unanticipated costs or claims due to delays or failure to perform by customers or third parties; customer failure to provide required materials or equipment; errors in engineering, specifications or designs; project modifications; adverse weather conditions, natural disasters, and other emergencies (including the ongoing COVID-19 pandemic); and performance and quality issues causing delay (including payment of liquidated damages) or requiring rework or replacement. Any changes in estimates may result in changes to profitability or losses associated with the related performance obligations.

Changes in estimated revenues, costs and profit are recognized on a cumulative catch-up basis and recorded in the period they are determined to be probable and can be reasonably estimated. Such changes in estimates can result in the recognition of revenue in a current period for performance obligations that were satisfied or partially satisfied in prior periods or the reversal of previously recognized revenue if the currently estimated revenue is less than the previous estimate. The impact of a change in contract estimate is measured as the difference between the revenue or gross profit recognized in the prior period as compared to the revenue or gross profit which would have been recognized had the revised estimate been used as the basis of recognition in the prior period. Changes in estimates can also result in contract losses, which are recognized in full when they are determined to be probable and can be reasonably estimated.

Under fixed price contracts, as well as unit-price contracts with more than an insignificant amount of partially completed units, revenue is recognized as performance obligations are satisfied over time, with the percentage completion generally measured as the percentage of costs incurred to total estimated costs for such performance obligation. Contract assets and liabilities fluctuate period to period based on various factors, including, among others, changes in the number and size of projects in progress at period end and variability in billing and payment terms, such as up-front or advance billings, interim or milestone billings, deferred billings and unapproved change orders and contract claims recognized in revenues.

Current and Long-Term Accounts Receivable and Allowance for Credit Losses

Quanta’s historical loss ratio and its determination of risk pools, which are used to calculate expected credit losses, may be adjusted for changes in customer credit concentrations within its portfolio of financial assets, customers’ ability to pay, and other considerations, such as economic and market changes, changes to the regulatory or technological environments affecting customers and the consistency between current and forecasted economic conditions and historical economic conditions used to derive historical loss ratios. At the end of each quarter, management reassesses these and other relevant factors, including any potential effects from the currently challenged energy market and the ongoing COVID-19 pandemic.

Quanta considers accounts receivable delinquent after 30 days but does not generally consider such amounts delinquent in its credit loss analysis unless the accounts receivable are at least 90 days past due. In addition to monitoring delinquent accounts, management monitors the credit quality of its receivables by, among other things, obtaining credit ratings of significant customers, assessing economic and market conditions and evaluating material changes to a customer’s business, cash flows and financial condition. Should anticipated recoveries relating to receivables fail to materialize, including anticipated recoveries relating to bankruptcies or other workout situations, Quanta could experience reduced cash flows and losses in excess of current allowances provided.

Cash and Cash Equivalents

Cash and cash equivalents held by joint ventures, which are either consolidated or proportionately consolidated, are available to support joint venture operations, but Quanta cannot utilize those assets to support its other operations. Quanta generally has no right to cash and cash equivalents held by a joint venture other than participating in distributions, to the extent made, and in the event of dissolution. Cash and cash equivalents held by Quanta’s wholly-owned captive insurance company are generally not available for use in support of its other operations.

Goodwill and Other Intangible Assets

Goodwill, net of accumulated impairment losses, represents the excess of cost over the fair market value of net tangible and identifiable intangible assets of acquired businesses and is stated at cost. Quanta has determined that its individual operating units represent its reporting units for the purpose of assessing goodwill impairment. Goodwill is not amortized but is tested for impairment annually in the fourth quarter of the fiscal year, or more frequently if events or circumstances arise which indicate

that goodwill may be impaired. Qualitative indicators that may trigger the need for annual or interim quantitative impairment testing include, among other things, deterioration in macroeconomic conditions; declining financial performance; deterioration in the operational environment; an expectation of selling or disposing of a portion of a reporting unit; a significant change in market, management, business strategy or business climate; a loss of a significant customer; increased competition; a sustained decrease in share price; or a decrease in Quanta’s market capitalization below book value. Quanta did not identify any triggering events in the first three quarters of 2021 and did not recognize any goodwill impairments for the three and nine months ended September 30, 2021.

Quanta’s intangible assets include customer relationships; backlog; trade names; non-compete agreements; patented rights, developed technology, and process certifications; and curriculum, all of which are subject to amortization, as well as an engineering license, which is not subject to amortization. As a result of the broader challenges in the energy market, the effect of which continues to be exacerbated by the COVID-19 pandemic, Quanta assessed the expected negative impact related to its intangible assets, particularly intangible assets associated with reporting units within the Underground Utility and Infrastructure Solutions Division. Quanta concluded that such impact is not likely to result in intangible asset impairments, and therefore no intangible asset impairments were recognized during the three and nine months ended September 30, 2021.

In connection with its annual goodwill assessment in 2020, Quanta also considered the sensitivity of its fair value estimates to changes in certain valuation assumptions, including with respect to reporting units within Quanta’s Underground Utility and Infrastructure Solutions Division that have recently been negatively impacted by energy market challenges. The potential future impact of these challenges is uncertain and depends on numerous factors and could continue or increase in future periods. In particular, two Canadian pipeline-related businesses and a United States material handling services business were identified in the annual goodwill assessment to have an increased risk of goodwill impairment in the near and medium term due to the currently challenged energy market. After taking into account a 10% decrease in fair value, these reporting units would have had fair values below their carrying amounts as of December 31, 2020. The aggregate goodwill and intangible asset balances for these three businesses totaled $100.1 million and $16.0 million as of September 30, 2021. In addition, a specialized industrial services business located in the United States experienced lower demand for certain services during the year ended December 31, 2020, which has continued in 2021, as customers reduced and deferred regularly scheduled maintenance due to lack of demand for refined products, particularly certain transportation-related fuels, as a result of the COVID-19 pandemic. After taking into account a 10% decrease in fair value, the reporting unit would have had a fair value in excess of its carrying amount as of December 31, 2020; however, uncertainty as to the timing and extent of recovery of demand for refined products has increased the risk of goodwill impairment for this reporting unit. The goodwill and intangible asset balances for this reporting unit were $313.4 million and $51.9 million as of September 30, 2021. Quanta will continue to monitor the goodwill associated with these reporting units, and should they suffer additional declines in actual or forecasted financial results, the risk of goodwill impairment would increase.

Investments in Affiliates and Other Entities

Investments in entities of which Quanta is not the primary beneficiary, but over which Quanta has the ability to exercise significant influence, are accounted for using the equity method of accounting. Equity method investments are carried at original cost adjusted for Quanta’s proportionate share of the investees’ income, losses and distributions. The carrying values for Quanta’s unconsolidated equity method investments were $73.8 million and $44.9 million at September 30, 2021 and December 31, 2020 and are included in “Other assets, net” in the accompanying condensed consolidated balance sheets. Quanta’s share of net income or losses of these investments is included within operating income in the accompanying condensed consolidated statements of operations when the investee is operationally integral to the operations of Quanta and is reported as “Equity in earnings (losses) of integral unconsolidated affiliates.” Quanta’s share of net income or losses of unconsolidated equity method investments that are not operationally integral to the operations of Quanta are included in “Other income (expense), net” below operating income in the accompanying condensed consolidated statements of operations. As of September 30, 2021, Quanta had receivables of $13.3 million and payables of $3.2 million from its integral unconsolidated affiliates.

During the nine months ended September 30, 2020, Quanta recognized impairment losses of $8.7 million related to a non-integral equity method investment, which were primarily due to the decline in commodity prices and production volumes during 2020. These impairment losses are included in “Other income (expense), net” in the accompanying condensed consolidated statements of operations for the nine months ended September 30, 2020.

In October 2021, Quanta acquired a 44% interest in an entity that provides right-of-way solutions, including site preparation and clearing, materials delivery and installation and management of permitting requirements and traffic control for approximately $18 million, subject to certain adjustments. This investment will be accounted for as an integral affiliate using the equity method of accounting.

Investments in entities of which Quanta is not the primary beneficiary, and over which Quanta does not have the ability to exercise significant influence are accounted for using the cost method of accounting. Additionally, certain investments provide for significant influence over the investee, but also include preferential liquidation rights, which precludes accounting for the investments under the equity method. These cost method investments are required to be measured at fair value, with changes in fair value recognized in net income unless the investments do not have readily determinable fair values, in which case the investments are measured at cost minus impairment (if any), plus or minus observable price changes in orderly transactions for an identical or similar investment in the same company. Earnings on investments accounted for using the cost method of accounting are recognized as dividends are declared. These earnings and any impairments of cost method investments are reported in “Other income (expense), net” in the accompanying condensed consolidated statements of operations.

The carrying values for investments accounted for using the cost method of accounting were $130.2 million and $39.5 million at September 30, 2021 and December 31, 2020, and these amounts are included in “Other assets, net” in the accompanying condensed consolidated balance sheets. During the three months ended March 31, 2021, Quanta acquired a minority interest in a broadband technology provider for $90.0 million. This investment includes preferential liquidation rights and is accounted for using the cost method of accounting. There have been no changes in the carrying value of the investment through September 30, 2021.

During the three months ended March 31, 2021, Quanta also purchased, through its wholly-owned captive insurance company, certain real property, including associated buildings and facilities, that is expected to be developed for its future corporate headquarters. A portion of this property is currently leased to third-party lessees and is expected to continue to be leased to third-party lessees in the future. As a result, an investment in real estate of $23.5 million was recognized at cost for the third-party leased portion of the property during the three months ended March 31, 2021, and the carrying amount of $23.4 million is included in “Other assets, net” in the accompanying condensed consolidated balance sheet at September 30, 2021.

During the three months ended June 30, 2020, Quanta recognized a $9.3 million impairment to an investment in a water and gas infrastructure contractor, which also represents the cumulative amount of impairment on investments accounted for using the cost method of accounting. Quanta did not exercise its option to acquire the remaining interest in this business at an agreed price based on a multiple of the company’s earnings during a designated performance period.

Income Taxes

Quanta regularly evaluates valuation allowances established for deferred tax assets for which future realization is uncertain, including in connection with changes in tax laws. The estimation of required valuation allowances includes estimates of future taxable income. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Quanta considers projected future taxable income and tax planning strategies in making this assessment. If actual future taxable income differs from these estimates, Quanta may not realize deferred tax assets to the extent estimated.

Fair Value Measurements

For disclosure purposes, qualifying assets and liabilities are categorized into three broad levels based on the priority of the inputs used to determine their fair values. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). Certain assumptions and other information as they relate to these qualifying assets and liabilities are described below.

Goodwill and Other Intangible Assets

Quanta has recorded goodwill and identifiable intangible assets in connection with certain of its historical business acquisitions. Quanta utilizes the fair value premise as the primary basis for its impairment valuation procedures. The Goodwill and Other Intangible Assets sections in Note 2 of the Notes to Consolidated Financial Statements in Item 8. Financial Statements and Supplementary Data in Part II of the 2020 Annual Report provide information regarding valuation methods, including the income approach, market approach and cost approach, and assumptions used to determine the fair value of these assets based on the appropriateness of each method in relation to the type of asset being valued. Quanta believes that the valuation methods it employs appropriately represent the methods that would be used by other market participants in determining fair value, and periodically engages the services of an independent valuation firm when a new business is acquired to assist management with the valuation process, including assistance with the selection of appropriate valuation methodologies and the development of market-based valuation assumptions. The level of inputs used for these fair value measurements is the lowest level (Level 3).

Investments

Equity investments with readily determinable fair values are measured at fair value, with changes in fair value recognized in net income. In cases where those readily determinable values are quoted market prices, the level of input used for these fair value measurements is the highest level (Level 1). Equity investments without readily determinable fair values are measured on a nonrecurring basis. These types of fair market value assessments are similar to other nonrecurring fair value measures used by Quanta, which include the use of significant judgments and available relevant market data. Such market data may include observations of the valuation of comparable companies, risk-adjusted discount rates and an evaluation of the expected

performance of the underlying portfolio asset, including historical and projected levels of profitability or cash flows. In addition, a variety of additional factors may be reviewed by management, including, but not limited to, contemporaneous financing and sales transactions with third parties, changes in market outlook and the third-party financing environment. The level of inputs used for these fair value measurements is the lowest level (Level 3).

Quanta has investments accounted for using the equity and cost methods of accounting. Quanta utilizes the fair value premise as the basis for its impairment valuation and recognizes impairment if there are sufficient indicators that the fair value of the investment is less than its carrying value.

Financial Instruments

The carrying amounts of cash equivalents, accounts receivable, contract assets, accounts payable, accrued expenses and contract liabilities approximate fair value due to the short-term nature of these instruments. All of Quanta’s cash equivalents were categorized as Level 1 assets at September 30, 2021 and December 31, 2020, as all values were based on unadjusted quoted prices for identical assets in an active market that Quanta has the ability to access.

Long-term Debt

The carrying amount of variable rate debt, which includes borrowings under Quanta’s senior credit facility, approximates fair value. Quanta’s fixed rate debt primarily includes its senior notes. The fair value of Quanta’s senior notes, which are described further in Note 6, was $2.52 billion at September 30, 2021, compared to a carrying value of $2.47 billion net of unamortized bond discount, underwriting discounts and deferred financing costs of $28.3 million. The fair value of the senior notes is based on the quoted market prices for the same issue, and the senior notes are categorized as Level 1 liabilities. See Note 6 for additional information regarding Quanta’s senior credit facility and senior notes.

Adoption of New Accounting Pronouncements and Accounting Standards Not Yet Adopted

Adoption of New Accounting Pronouncements

In December 2019, the FASB issued an update that, among other things, amends the guidance related to accounting for tax law changes when an entity has a year-to-date loss in an interim period and provides guidance on how to evaluate whether a step-up in tax basis of goodwill relates to a business combination or a separate transaction. This update is effective for interim and annual periods beginning after December 15, 2020, with certain amendments applied prospectively and other amendments applied on a modified retrospective basis. Quanta adopted this update effective January 1, 2021, and it did not have a material impact on Quanta’s condensed consolidated financial statements at the date of adoption.

In January 2020, the FASB issued an update that clarified the applicable guidance for measurement of the fair value of equity and cost method investments when there is a change in the level of ownership or degree of influence. Quanta adopted this update effective January 1, 2021 and will prospectively apply this update.

Acquisitions

These allocations require significant use of estimates and are based on information that was available to management at the time these condensed consolidated financial statements were prepared. Quanta uses a variety of information to estimate fair values, including quoted market prices, carrying amounts and valuation techniques such as discounted cash flows. When deemed appropriate, third-party appraisal firms are engaged to assist in fair value determination of fixed assets, intangible assets and certain other assets and liabilities.

Segment Information

Quanta currently presents its operations under two reportable segments: (1) Electric Power Infrastructure Solutions and (2) Underground Utility and Infrastructure Solutions. This structure is generally based on the broad end-user markets for Quanta’s services. See Note 1 for additional information regarding Quanta’s reportable segments.

Quanta’s segment results are derived from the types of services provided across its operating units in each of its end user markets. Quanta’s entrepreneurial business model allows multiple operating units to serve the same or similar customers and to provide a range of services across end user markets. Quanta’s operating units are organized into one of two internal divisions: the Electric Power Infrastructure Solutions Division and the Underground Utility and Infrastructure Solutions Division. These internal divisions are closely aligned with the reportable segments, and operating units are assigned to divisions based on the predominant type of work performed.

Reportable segment information, including revenues and operating income by type of work, is gathered from each operating unit for the purpose of evaluating segment performance in support of Quanta’s market strategies. Classification of operating unit revenues by type of work for segment reporting purposes can require judgment on the part of management. Quanta’s operating units may perform joint projects for customers in multiple industries, deliver multiple types of services under a single customer contract or provide service offerings to various industries. For example, Quanta performs joint trenching projects to install distribution lines for electric power and natural gas customers.

In addition, Quanta’s integrated operations and common administrative support for its operating units require that certain allocations be made to determine segment profitability, including allocations of shared and indirect costs (e.g., facility costs), indirect operating expenses (e.g., depreciation), and general and administrative costs. Certain corporate costs are not allocated

and include payroll and benefits, employee travel expenses, facility costs, professional fees, acquisition costs and amortization related to intangible assets.

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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Revenue Disaggregated by Geographic Location and Contract Type

The following tables present Quanta’s revenue disaggregated by geographic location, as determined by the job location, and contract type (in thousands):

	Three Months Ended September 30,								Nine Months Ended September 30,
	2021				2020				2021				2020
By primary geographic location:
United States	$	2,892,446	86.2	%	$	2,629,606	87.1	%	$	7,669,360	84.7	%	$	7,105,568	85.7	%
Canada	382,072		11.4	%	320,576		10.6	%	1,123,077		12.4	%	917,621		11.1	%
Australia	52,804		1.6	%	49,537		1.6	%	170,719		1.9	%	156,664		1.9	%
Others	25,956		0.8	%	20,442		0.7	%	93,519		1.0	%	110,634		1.3	%
Total revenues	$	3,353,278	100.0	%	$	3,020,161	100.0	%	$	9,056,675	100.0	%	$	8,290,487	100.0	%

	Three Months Ended September 30,								Nine Months Ended September 30,
	2021				2020				2021				2020
By contract type:
Unit-price contracts	$	1,399,358	41.8	%	$	1,141,102	37.7	%	$	3,593,644	39.7	%	$	3,034,169	36.6	%
Cost-plus contracts	825,622		24.6	%	702,392		23.3	%	2,247,879		24.8	%	1,958,404		23.6	%
Fixed price contracts	1,128,298		33.6	%	1,176,667		39.0	%	3,215,152		35.5	%	3,297,914		39.8	%
Total revenues	$	3,353,278	100.0	%	$	3,020,161	100.0	%	$	9,056,675	100.0	%	$	8,290,487	100.0	%

Contract Assets and Liabilities

Contract assets and liabilities, recorded as current assets and liabilities, respectively, consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Contract assets	$	760,279	$	453,832
Contract liabilities	$	501,142	$	528,864

Composition of the Allowance for Credit Losses

Activity in Quanta’s allowance for credit losses consisted of the following (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Balance at beginning of period	$	39,713	$	14,948	$	16,546	$	9,398
Cumulative effect of adoption of new credit loss standard	—		—		—		5,067
Provision for credit losses	249		1,566		24,169		2,910
Direct write-offs charged against the allowance	(253)		(110)		(1,006)		(971)
Balance at end of period	$	39,709	$	16,404	$	39,709	$	16,404

Cash and Cash Equivalents

Amounts related to Quanta’s cash and cash equivalents based on geographic location of the bank accounts were as follows (in thousands):

	September 30, 2021		December 31, 2020
Cash and cash equivalents held in domestic bank accounts	$	1,664,990	$	156,122
Cash and cash equivalents held in foreign bank accounts	31,220		28,498
Total cash and cash equivalents	$	1,696,210	$	184,620

Amounts related to cash and cash equivalents held by joint ventures and the captive insurance company, which are included in Quanta’s total cash and cash equivalents balances, were as follows (in thousands):

	September 30, 2021		December 31, 2020
Cash and cash equivalents held by domestic joint ventures	$	13,377	$	7,714
Cash and cash equivalents held by foreign joint ventures	4,568		3,973
Total cash and cash equivalents held by joint ventures	17,945		11,687
Cash and cash equivalents held by captive insurance company	132,916		85,014
Cash and cash equivalents not held by joint ventures or captive insurance company	1,545,349		87,919
Total cash and cash equivalents	$	1,696,210	$	184,620

Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Accounts payable, trade	$	956,873	$	798,023
Accrued compensation and related expenses	497,451		378,002
Other accrued expenses	306,465		333,769
Accounts payable and accrued expenses	$	1,760,789	$	1,509,794

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Acquisitions (Tables)

9 Months Ended

Sep. 30, 2021

Business Combination and Asset Acquisition [Abstract]

Aggregate Consideration Paid or Payable and Allocation Net Assets

The following table summarizes the fair value of

total consideration transferred or estimated to be transferred and the fair value of assets acquired and liabilities assumed as of September 30, 2021 for acquisitions completed in the year-to-date periods shown below (in thousands).

	September 30, 2021		December 31, 2020
Consideration:
Cash paid or payable	$	59,226	$	359,624
Value of Quanta common stock issued	2,479		57,119
Contingent consideration	—		2,250
Fair value of total consideration transferred or estimated to be transferred	$	61,705	$	418,993
Accounts receivable	$	10,678	$	74,492
Contract assets	2,048		8,919
Other current assets	7,189		53,302
Property and equipment	5,651		143,276
Other assets	216		14
Identifiable intangible assets	18,506		96,827
Contract liabilities	(16)		(3,750)
Other current liabilities	(10,371)		(35,112)
Deferred tax liabilities, net	(2,093)		(3,185)
Total identifiable net assets	31,808		334,783
Goodwill	29,897		84,210
Fair value of net assets acquired	$	61,705	$	418,993

Estimated Fair Values of Identifiable Intangible Assets and Related Weighted Average Amortization

The following table summarizes the estimated fair values of identifiable intangible assets for the acquisitions completed in the nine months ended September 30, 2021 as of the acquisition

date and the related weighted average amortization periods by asset type (in thousands, except for weighted average amortization periods, which are in years).    

	Estimated Fair Value		Weighted Average Amortization Period in Years
Customer relationships	$	3,063	5.6
Backlog	3,811		1.3
Trade names	1,110		14.4
Non-compete agreements	1,494		5.0
Patented rights, developed technology, and process certifications	9,028		3.5
Total intangible assets subject to amortization	$	18,506	4.2

Discount Rates and Customer Attrition Rates

The following table includes the discount rates and customer attrition rates used to determine the fair value of customer relationship intangible assets for businesses acquired during the nine months ended September 30, 2021 and the year ended December 31, 2020 as of the respective acquisition dates:

	2021		2020
	Range	Weighted Average	Range	Weighted Average
Discount rates	22% to 25%	22%	19% to 25%	20%
Customer attrition rates	20% to 30%	23%	10% to 43%	13%

Unaudited Supplemental Pro Forma Results of Operations

The following unaudited supplemental pro forma results of operations for Quanta, which incorporate the acquisitions completed in the three and nine months ended September 30, 2021 and 2020, have been provided for illustrative purposes only and do not purport to be indicative of the actual results that would have been achieved by the combined companies for the periods presented or that may be achieved by the combined companies in the future. Future results may vary significantly from the results reflected in the following pro forma financial information because of future events and transactions, as well as other factors (in thousands, except per share amounts).

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Revenues	$	3,357,877	$	3,069,921	$	9,090,656	$	8,519,226
Gross profit	$	535,935	$	520,866	$	1,367,256	$	1,254,826
Selling, general and administrative expenses	$	(275,363)	$	(256,608)	$	(794,249)	$	(740,564)
Amortization of intangible assets	$	(22,836)	$	(22,843)	$	(68,167)	$	(69,742)
Net income	$	175,865	$	166,326	$	387,713	$	287,171
Net income attributable to common stock	$	174,832	$	165,539	$	383,184	$	282,718
Earnings per share attributable to common stock:
Basic	$	1.25	$	1.17	$	2.73	$	1.98
Diluted	$	1.21	$	1.14	$	2.65	$	1.94

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Per Share Information (Tables)

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Basic and Diluted Earnings Per Share Attributable to Common Stock

The amounts used to compute basic and diluted earnings per share attributable to common stock consisted of the following (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Amounts attributable to common stock:
Net income attributable to common stock	$	174,365	$	162,913	$	381,159	$	275,545
Weighted average shares outstanding:
Weighted average shares outstanding for basic earnings per share attributable to common stock	140,008		140,542		140,134		141,610
Effect of dilutive unvested non-participating stock-based awards	4,296		3,821		4,314		3,375
Weighted average shares outstanding for diluted earnings per share attributable to common stock	144,304		144,363		144,448		144,985

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Debt Obligations (Tables)

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Long-term Debt Obligations

Quanta’s long-term debt obligations consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
0.950% Senior Notes due October 2024	$	500,000	$	—
2.900% Senior Notes due October 2030	1,000,000		1,000,000
2.350% Senior Notes due January 2032	500,000		—
3.050% Senior Notes due October 2041	500,000		—
Borrowings under senior credit facility	415,851		148,508
Other long-term debt	51,366		46,981
Finance leases	2,253		2,228
Unamortized discount and deferred financing costs related to senior notes	(28,289)		(12,892)
Total long-term debt obligations	2,941,181		1,184,825
Less — Current maturities of long-term debt	10,276		10,531
Total long-term debt obligations, net of current maturities	$	2,930,905	$	1,174,294

Current Maturities and Interest Rates of Long-Term Debt and Short-Term Debt

Quanta’s current maturities of long-term debt and short-term debt consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Short-term debt	$	13,472	$	4,233
Current maturities of long-term debt	10,276		10,531
Current maturities of long-term debt and short-term debt	$	23,748	$	14,764

Schedule of Interest on Senior Notes

Interest on the Senior Notes is payable semi-annually in arrears as set forth below (dollars in thousands).

Title of the Notes	Interest Amount		Payment Dates	Commencement Date
0.950% Senior Notes due October 2024	$	2,375	April 1 and October 1	April 1, 2022
2.900% Senior Notes due October 2030	$	14,500	April 1 and October 1	April 1, 2021
2.350% Senior Notes due January 2032	$	5,875	January 15 and July 15	July 15, 2022
3.050% Senior Notes due October 2041	$	7,625	April 1 and October 1	April 1, 2022

Borrowings under Credit Facility and Applicable Interest Rates

Borrowings under the senior credit facility and the applicable interest rates were as follows (dollars in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2021			2020			2021			2020
Maximum amount outstanding	$	517,883		$	1,462,069		$	576,993		$	2,023,326
Average daily amount outstanding	$	416,089		$	1,255,171		$	360,609		$	1,395,207
Weighted-average interest rate	2.13		%	1.57		%	2.05		%	2.13		%

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Leases (Tables)

9 Months Ended

Sep. 30, 2021

Leases [Abstract]

Components of Lease Costs

The components of lease costs in the accompanying condensed consolidated statements of operations are as follows (in thousands):

		Three Months Ended				Nine Months Ended
		September 30,				September 30,
Lease cost	Classification	2021		2020		2021		2020
Finance lease cost:
Amortization of lease assets	Depreciation (1)	$	231	$	53	$	705	$	515
Interest on lease liabilities	Interest expense	18		16		68		50
Operating lease cost	Cost of services and Selling, general and administrative expenses	25,323		29,577		80,046		89,289
Short-term and variable lease cost (2)	Cost of services and Selling, general and administrative expenses	176,605		160,365		494,846		478,683
Total lease cost		$	202,177	$	190,011	$	575,665	$	568,537

(1)    Depreciation is included within “Cost of services” and “Selling, general and administrative expenses” in the accompanying condensed consolidated statements of operations.

(2)    Short-term lease cost includes both leases and rentals with initial terms of one year or less. Variable lease cost is insignificant and primarily relates to real estate leases and consists of common area maintenance charges, real estate taxes, insurance and other variable costs.

Future Minimum Lease Payments - Operating Leases

Future minimum lease payments for operating and finance leases were as follows (in thousands):

	As of September 30, 2021
	Operating Leases		Finance Leases		Total
Remainder of 2021	$	23,964	$	296	$	24,260
2022	80,516		872		81,388
2023	58,265		666		58,931
2024	36,341		409		36,750
2025	24,449		126		24,575
Thereafter	36,996		—		36,996
Total future minimum operating and finance lease payments	$	260,531	$	2,369	$	262,900
Less imputed interest	(20,342)		(116)		(20,458)
Total lease liabilities	$	240,189	$	2,253	$	242,442

Future Minimum Lease Payments - Finance Leases

Future minimum lease payments for operating and finance leases were as follows (in thousands):

	As of September 30, 2021
	Operating Leases		Finance Leases		Total
Remainder of 2021	$	23,964	$	296	$	24,260
2022	80,516		872		81,388
2023	58,265		666		58,931
2024	36,341		409		36,750
2025	24,449		126		24,575
Thereafter	36,996		—		36,996
Total future minimum operating and finance lease payments	$	260,531	$	2,369	$	262,900
Less imputed interest	(20,342)		(116)		(20,458)
Total lease liabilities	$	240,189	$	2,253	$	242,442

Other Information Related to Leases

The weighted average remaining lease terms and discount rates were as follows:

	As of September 30, 2021
Weighted average remaining lease term (in years):
Operating leases	4.16
Finance leases	2.90
Weighted average discount rate:
Operating leases	3.9	%
Finance leases	3.7	%

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Equity (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Treasury Stock

Quanta repurchased the following shares of common stock in the open market under the stock repurchase programs (in thousands):

Quarter ended:	Shares	Amount
September 30, 2021	185	$	16,828
June 30, 2021	314	$	29,450
March 31, 2021	222	$	17,710
December 31, 2020	720	$	49,949
September 30, 2020	—	$	—
June 30, 2020	—	$	—
March 31, 2020	5,960	$	200,000

Dividends

Quanta declared the following cash dividends and cash dividend equivalents during 2020 and the first nine months of 2021 (in thousands, except per share amounts):

Declaration	Record	Payment	Dividend		Dividends
Date	Date	Date	Per Share		Declared
August 27, 2021	October 1, 2021	October 15, 2021	$	0.06	$	8,638
May 27, 2021	July 1, 2021	July 15, 2021	$	0.06	$	8,650
March 25, 2021	April 6, 2021	April 15, 2021	$	0.06	$	8,429
December 11, 2020	January 4, 2021	January 15, 2021	$	0.06	$	8,933
August 26, 2020	October 1, 2020	October 15, 2020	$	0.05	$	7,244
May 28, 2020	July 1, 2020	July 15, 2020	$	0.05	$	7,182
March 26, 2020	April 6, 2020	April 15, 2020	$	0.05	$	7,184

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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Schedule of RSUs and PSUs to be Settled in Common Stock Activity

A summary of the activity for RSUs to be settled in common stock for the nine months ended September 30, 2021 and 2020 is set forth below (shares in thousands):

	2021		2020
	RSUs	Weighted Average Grant Date Fair Value (Per share)	RSUs	Weighted Average Grant Date Fair Value (Per share)
Unvested at January 1	3,869	$37.57	3,265	$35.34
Granted	945	$82.75	2,008	$39.65
Vested	(1,442)	$36.92	(1,228)	$35.68
Forfeited	(119)	$47.23	(114)	$36.26
Unvested at period ended September 30	3,253	$50.71	3,931	$37.41

A summary of the activity for PSUs to be settled in common stock for the nine months ended September 30, 2021 and 2020 is set forth below (shares in thousands):

	2021		2020
	PSUs	Weighted Average Grant Date Fair Value (Per share)	PSUs	Weighted Average Grant Date Fair Value (Per share)
Unvested at January 1	1,047	$37.65	848	$33.20
Granted	174	$90.44	436	$34.59
Vested	(268)	$38.28	(238)	$17.48
Forfeited	(11)	$36.90	—	N/A
Unvested at September 30	942	$47.27	1,046	$37.35

Grant Date Fair Value for Awards of Performance Units Inputs

The Monte Carlo simulation valuation methodology applied the following key inputs:

	2021		2020
Valuation date price based on March 25, 2021 and March 26, 2020 closing stock prices of Quanta common stock	$83.48		$31.49
Expected volatility	36	%	34	%
Risk-free interest rate	0.26	%	0.35	%
Term in years	2.77		2.76

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Summarized Financial Information

Summarized financial information for Quanta’s reportable segments is presented in the following table (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Revenues:
Electric Power Infrastructure Solutions	$	2,328,468	$	2,107,621	$	6,536,363	$	5,667,566
Underground Utility and Infrastructure Solutions	1,024,810		912,540		2,520,312		2,622,921
Consolidated revenues	$	3,353,278	$	3,020,161	$	9,056,675	$	8,290,487
Operating income (loss):
Electric Power Infrastructure Solutions (1)(2)	$	288,283	$	268,376	$	724,217	$	581,030
Underground Utility and Infrastructure Solutions	68,167		76,220		100,917		128,747
Corporate and Non-Allocated Costs	(108,373)		(102,381)		(301,677)		(273,909)
Consolidated operating income	$	248,077	$	242,215	$	523,457	$	435,868
Depreciation:
Electric Power Infrastructure Solutions	$	37,196	$	30,637	$	110,925	$	88,337
Underground Utility and Infrastructure Solutions	20,958		21,313		63,183		64,280
Corporate and Non-Allocated Costs	3,462		4,294		12,372		12,563
Consolidated depreciation	$	61,616	$	56,244	$	186,480	$	165,180

(1)    As of December 31, 2020, Quanta had substantially completed the exit of its operations in Latin America. For the three and nine months ended September 30, 2020, operating income for the Electric Power Infrastructure Solutions segment included $15.4 million and $46.9 million of operating losses related to Latin American operations.

(2)    Operating income for the Electric Power Infrastructure Solutions segment includes equity in earnings of integral unconsolidated affiliates that are operationally integral to the operations of Quanta, which primarily consists of equity in earnings related to Quanta’s equity interest in LUMA.

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Supplemental Cash Flow Information (Tables)

9 Months Ended

Sep. 30, 2021

Supplemental Cash Flow Elements [Abstract]

Net Effects of Changes in Operating Assets and Liabilities, Net, on Cash Flows from Operating Activities

The net effects of changes in operating assets and liabilities, net of non-cash transactions, on cash flows from operating activities are as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Accounts and notes receivable	$	(411,890)	$	(322,579)	$	(299,857)	$	37,541
Contract assets	(96,423)		21,950		(308,849)		121,999
Inventories	5		8,655		(6,139)		6,787
Prepaid expenses and other current assets	37,406		19,655		(4,943)		70,133
Accounts payable and accrued expenses and other non-current liabilities	230,631		235,633		289,833		147,888
Contract liabilities	(1,397)		(79,964)		(27,027)		(73,567)
Other, net	(6,027)		(7,813)		(15,205)		(20,066)
Net change in operating assets and liabilities, net of non-cash transactions	$	(247,695)	$	(124,463)	$	(372,187)	$	290,715

Reconciliation of Cash, Cash Equivalents, and Restricted Cash and Additional Supplemental Cash Flow Information

Reconciliations of cash, cash equivalents, and restricted cash reported within the condensed consolidated balance sheets that sum to the total of such amounts shown in the statements of cash flows are as follows (in thousands):

	September 30,
	2021		2020
Cash and cash equivalents	$	1,696,210	$	216,935
Restricted cash included in “Prepaid expenses and other current assets”	2,108		1,252
Restricted cash included in “Other assets, net”	778		915
Total cash, cash equivalents, and restricted cash reported in the statements of cash flows	$	1,699,096	$	219,102

	June 30,
	2021		2020
Cash and cash equivalents	$	212,473	$	530,670
Restricted cash included in “Prepaid expenses and other current assets”	1,460		1,266
Restricted cash included in “Other assets, net”	782		917
Total cash, cash equivalents, and restricted cash reported in the statements of cash flows	$	214,715	$	532,853

	December 31,
	2020		2019
Cash and cash equivalents	$	184,620	$	164,798
Restricted cash included in “Prepaid expenses and other current assets”	1,275		4,026
Restricted cash included in “Other assets, net”	913		921
Total cash, cash equivalents, and restricted cash reported in the statements of cash flows	$	186,808	$	169,745

Additional supplemental cash flow information is as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Cash (paid) received during the period for —
Interest paid	$	(2,260)	$	(8,443)	$	(26,883)	$	(30,704)
Income taxes paid	$	(35,740)	$	(86,077)	$	(103,225)	$	(149,690)
Income tax refunds	$	2,419	$	1,087	$	9,211	$	5,545

Supplemental Cash Flow Information Related to Leases

Supplemental cash flow information related to leases and rental purchase options is as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	(25,331)	$	(29,333)	$	(79,730)	$	(88,570)
Operating cash flows from finance leases	$	(18)	$	(16)	$	(68)	$	(50)
Financing cash flows from finance leases	$	(168)	$	(102)	$	(688)	$	(525)
Lease assets obtained in exchange for lease liabilities:
Operating leases	$	17,081	$	16,619	$	41,686	$	56,970
Finance leases	$	112	$	275	$	398	$	1,158
Rental purchase option assets obtained in exchange for rental purchase option liabilities	$	1,129	$	3,306	$	7,009	$	13,229

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Business and Organization (Detail)	9 Months Ended
	Sep. 30, 2021 Segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	2

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Summary of Significant Accounting Policies - Performance Obligation (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Remaining performance obligation	$ 4,370	$ 3,990
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percent of remaining performance obligation expected to be recognized		71.20%
Recognition period for remaining performance obligation		12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percent of remaining performance obligation expected to be recognized	78.70%
Recognition period for remaining performance obligation	12 months

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Summary of Significant Accounting Policies - Revenue Recognition (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021 USD ($) unit numberOfProjects	Jun. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) unit numberOfProjects	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results, amount	$ (41,900)		$ (48,700)	$ (127,400)
Change in contract estimates, (favorable) unfavorable impact on operating results, percent	(7.80%)		(9.60%)	(9.40%)	(5.00%)
Revenues recognized related to change orders and claims	$ 254,100			$ 254,100		$ 141,200
Number of delayed transmission projects due to changes orders and claims | numberOfProjects	2			2
Number of projects that experienced a significant impact due accelerated timeline | unit	1			1
Percent of total revenues recognized associated with revenue recognition method	42.50%		47.90%	43.40%	48.40%
Revenue, related to performance obligation satisfied in previous periods				$ 151,700
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period				381,900
Provision for credit losses	$ 249		$ 1,566	24,169	$ 2,910
Current retainage balances	295,900			295,900		306,300
Non-current retainage balances	88,200			88,200		88,200
Unbilled receivables	827,300			827,300		472,300
Latin America
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results, amount			12,100		28,600
Limetree Bay Refining, LLC
Revenue Recognition [Line Items]
Accounts receivable, before allowance for credit loss	31,300			31,300
Limetree Bay Terminals, LLC
Revenue Recognition [Line Items]
Accounts receivable, before allowance for credit loss	700			700
Limetree Bay Refining, LLC And Limetree Terminal, LLC
Revenue Recognition [Line Items]
Provision for credit losses		$ 23,600
Accounts receivable	8,400			8,400
Accounts Payable and Accrued Expenses
Revenue Recognition [Line Items]
Unearned revenues, current portion	$ 39,500			$ 39,500		$ 53,600
Larger Pipeline Transmission Projects
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results, amount			$ (32,900)		$ (15,100)

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Summary of Significant Accounting Policies - Revenue Disaggregated by Geographic Location and Contract Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 3,353,278	$ 3,020,161	$ 9,056,675	$ 8,290,487
Percent of total revenues	100.00%	100.00%	100.00%	100.00%
Unit-price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,399,358	$ 1,141,102	$ 3,593,644	$ 3,034,169
Percent of total revenues	41.80%	37.70%	39.70%	36.60%
Cost-plus contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 825,622	$ 702,392	$ 2,247,879	$ 1,958,404
Percent of total revenues	24.60%	23.30%	24.80%	23.60%
Fixed price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,128,298	$ 1,176,667	$ 3,215,152	$ 3,297,914
Percent of total revenues	33.60%	39.00%	35.50%	39.80%
United States
Disaggregation of Revenue [Line Items]
Revenues	$ 2,892,446	$ 2,629,606	$ 7,669,360	$ 7,105,568
Percent of total revenues	86.20%	87.10%	84.70%	85.70%
Canada
Disaggregation of Revenue [Line Items]
Revenues	$ 382,072	$ 320,576	$ 1,123,077	$ 917,621
Percent of total revenues	11.40%	10.60%	12.40%	11.10%
Australia
Disaggregation of Revenue [Line Items]
Revenues	$ 52,804	$ 49,537	$ 170,719	$ 156,664
Percent of total revenues	1.60%	1.60%	1.90%	1.90%
Others
Disaggregation of Revenue [Line Items]
Revenues	$ 25,956	$ 20,442	$ 93,519	$ 110,634
Percent of total revenues	0.80%	0.70%	1.00%	1.30%

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Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Contract assets	$ 760,279	$ 453,832
Contract liabilities	$ 501,142	$ 528,864

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Summary of Significant Accounting Policies - Composition of the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 39,713	$ 14,948	$ 16,546	$ 9,398
Provision for credit losses	249	1,566	24,169	2,910
Direct write-offs charged against the allowance	(253)	(110)	(1,006)	(971)
Balance at end of period	$ 39,709	$ 16,404	$ 39,709	16,404
Adjustment due to Adoption of New ASU
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 5,067

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Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 1,696,210	$ 212,473	$ 184,620	$ 216,935	$ 530,670	$ 164,798
Cash equivalents	1,630,000		98,000
Domestic Bank Accounts
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	1,664,990		156,122
Foreign Bank Accounts
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	31,220		28,498
Domestic Joint Ventures
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	13,377		7,714
Foreign Joint Ventures
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	4,568		3,973
Investments in Joint Ventures
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	17,945		11,687
Captive Insurance Company
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	132,916		85,014
Cash Not Held by Joint Ventures
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 1,545,349		$ 87,919

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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) unit	Dec. 31, 2020 USD ($) unit
Goodwill [Line Items]
Goodwill impairment loss	$ 0	$ 0
Impairment of other intangible assets	0	0
Decrease in fair value of reporting units considered for impairment			10.00%
Goodwill	2,145,963,000	2,145,963,000	$ 2,121,014,000
Other intangible assets	388,999,000	$ 388,999,000	$ 435,655,000
Underground Utility and Infrastructure Solutions | Two Canadian Pipeline Operating Businesses
Goodwill [Line Items]
Number of reporting units at risk after cushion test | unit			2
Underground Utility and Infrastructure Solutions | Two Canadian Pipeline Operating Businesses And United States Material Handling Services
Goodwill [Line Items]
Number of reporting units at risk after cushion test | unit		3
Goodwill	100,100,000	$ 100,100,000
Other intangible assets	16,000,000	16,000,000
Underground Utility and Infrastructure Solutions | Specialized Industrial Services Business
Goodwill [Line Items]
Goodwill	313,400,000	313,400,000
Other intangible assets	$ 51,900,000	$ 51,900,000

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Summary of Significant Accounting Policies - Investments in Affiliates and Other Entities (Details) mile in Thousands, $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Oct. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) mile	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Equity method investments		$ 73,800			$ 73,800			$ 44,900
Equity in earnings (losses) of unconsolidated affiliates		10,758	$ 5,260		24,734	$ (2,207)
Investment in real estate		23,400			23,400		$ 23,500
Impairment of cost method investment		0	$ 0		0	9,311
Length of electric transmission and distribution system | mile				18
Quanta Services, Inc.
Summary Of Significant Accounting Policies [Line Items]
Cost method investments		130,200			130,200			39,500
LUMA Energy, LLC
Summary Of Significant Accounting Policies [Line Items]
Term of operation and maintenance agreement				15 years
Integral Affiliates
Summary Of Significant Accounting Policies [Line Items]
Due from related parties		13,300			13,300
Due to related parties		3,200			3,200
Certain Non-Integral Equity Investments
Summary Of Significant Accounting Policies [Line Items]
Equity in earnings (losses) of unconsolidated affiliates						$ (8,700)
Broadband Technology Provider
Summary Of Significant Accounting Policies [Line Items]
Cost method investments							$ 90,000
Cost Method Investment | Quanta Services, Inc.
Summary Of Significant Accounting Policies [Line Items]
Impairment of cost method investment				$ 9,300
LUMA Energy, LLC
Summary Of Significant Accounting Policies [Line Items]
Equity method investments		$ 34,500			$ 34,500			$ 10,900
Equity interest				50.00%
Integral Unconsolidated Affiliates | Subsequent Event
Summary Of Significant Accounting Policies [Line Items]
Equity interest	44.00%
Payments to interest in entity	$ 18,000

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Summary of Significant Accounting Policies - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Accounts payable, trade	$ 956,873	$ 798,023
Accrued compensation and related expenses	497,451	378,002
Other accrued expenses	306,465	333,769
Accounts payable and accrued expenses	$ 1,760,789	$ 1,509,794

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Summary of Significant Accounting Policies - Income Taxes (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Accounting Policies [Abstract]
Total amount of unrecognized tax benefits relating to uncertain tax positions	$ 40.6
Increase (decrease) in the total amount of unrecognized tax benefits relating to uncertain tax positions	7.4
Increase in reserves for uncertain tax positions expected to be taken in current year	5.0
Increase in reserves from uncertain tax positions from changes in prior year positions	2.4
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months	$ 13.3

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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - Senior Notes - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	$ 2,520,000
Long-term debt	2,470,000
Unamortized discount and deferred financing costs related to senior notes	$ 28,289	$ 12,892

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Acquisitions - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 13, 2021	Oct. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Net tangible assets acquired			$ 136,400		$ 136,400		$ 136,400
Identified intangible assets							37,600
Goodwill acquired							35,300
Subsequent Event
Business Acquisition [Line Items]
Post-acquisition period, financial performance objectives	3 years
Acquisitions 2021
Business Acquisition [Line Items]
Fair value of total consideration transferred or estimated to be transferred					$ 61,705
Number of shares granted for acquired companies (in shares)					32,822
Value of quanta common stock issued					$ 2,479
Contingent consideration			0		0		0
Identified intangible assets					18,506
Goodwill acquired					29,897
Goodwill expected to be deductible for income tax			13,300		13,300		$ 13,300
Revenues included in consolidated results of operations			13,400		14,600
Income (loss) before taxes			(300)		(200)
Acquisition costs			$ 2,000		2,400
Cash consideration					$ 59,226
Acquisitions 2020
Business Acquisition [Line Items]
Fair value of total consideration transferred or estimated to be transferred								$ 418,993
Number of shares granted for acquired companies (in shares)								1,334,469
Value of quanta common stock issued								$ 57,119
Aggregate maximum payout amount								$ 6,900
Aggregate maximum payout amount, target term								5 years
Contingent consideration								$ 2,250
Goodwill acquired								84,210
Goodwill expected to be deductible for income tax								72,600
Revenues included in consolidated results of operations				$ 55,200		$ 63,000
Income (loss) before taxes				1,000		1,000
Acquisition costs				$ 10,600		$ 11,400
Cash consideration								$ 359,624
Blattner Holding Company | Subsequent Event
Business Acquisition [Line Items]
Cash consideration	$ 2,290,000
Number of shares granted for acquired companies (in shares)	3,300,000
Value of quanta common stock issued	$ 345,400
Aggregate maximum payout amount	$ 300,000
Business Providing Electric Power Construction And Related Services | Subsequent Event
Business Acquisition [Line Items]
Number of shares granted for acquired companies (in shares)		42,748
Value of quanta common stock issued		$ 4,000
Cash consideration		$ 50,000

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Acquisitions - Aggregate Consideration Paid or Payable and Allocation of Net Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill		$ 35,300
Acquisitions 2021
Business Acquisition [Line Items]
Cash paid or payable	$ 59,226
Value of Quanta common stock issued	2,479
Contingent consideration	0	0
Fair value of total consideration transferred or estimated to be transferred	61,705
Accounts receivable	10,678	10,678
Contract assets	2,048	2,048
Other current assets	7,189	7,189
Property and equipment	5,651	5,651
Other assets	216	216
Identifiable intangible assets	18,506	18,506
Contract liabilities	(16)	(16)
Other current liabilities	(10,371)	(10,371)
Deferred tax liabilities, net	(2,093)	(2,093)
Total identifiable net assets	31,808	31,808
Goodwill	29,897
Fair value of net assets acquired	$ 61,705	$ 61,705
Acquisitions 2020
Business Acquisition [Line Items]
Cash paid or payable			$ 359,624
Value of Quanta common stock issued			57,119
Contingent consideration			2,250
Fair value of total consideration transferred or estimated to be transferred			418,993
Accounts receivable			74,492
Contract assets			8,919
Other current assets			53,302
Property and equipment			143,276
Other assets			14
Identifiable intangible assets			96,827
Contract liabilities			(3,750)
Other current liabilities			(35,112)
Deferred tax liabilities, net			(3,185)
Total identifiable net assets			334,783
Goodwill			84,210
Fair value of net assets acquired			$ 418,993

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Acquisitions - Estimated Fair Values of Identifiable Intangible Assets and Related Weighted Average Amortization (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Business Acquisition [Line Items]
Estimated Fair Value		$ 37,600
Acquisitions 2021
Business Acquisition [Line Items]
Estimated Fair Value	$ 18,506
Weighted Average Amortization Period in Years	4 years 2 months 12 days
Customer relationships | Acquisitions 2021
Business Acquisition [Line Items]
Estimated Fair Value	$ 3,063
Weighted Average Amortization Period in Years	5 years 7 months 6 days
Backlog | Acquisitions 2021
Business Acquisition [Line Items]
Estimated Fair Value	$ 3,811
Weighted Average Amortization Period in Years	1 year 3 months 18 days
Trade names | Acquisitions 2021
Business Acquisition [Line Items]
Estimated Fair Value	$ 1,110
Weighted Average Amortization Period in Years	14 years 4 months 24 days
Non-compete agreements | Acquisitions 2021
Business Acquisition [Line Items]
Estimated Fair Value	$ 1,494
Weighted Average Amortization Period in Years	5 years
Patented rights, developed technology, and process certifications | Acquisitions 2021
Business Acquisition [Line Items]
Estimated Fair Value	$ 9,028
Weighted Average Amortization Period in Years	3 years 6 months

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Acquisitions - Discount Rates and Customer Attrition Rates Used to Determine Fair Value (Details) - Customer relationships	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Minimum
Business Acquisition [Line Items]
Discount rates	22.00%	19.00%
Customer attrition rates	20.00%	10.00%
Maximum
Business Acquisition [Line Items]
Discount rates	25.00%	25.00%
Customer attrition rates	30.00%	43.00%
Weighted Average
Business Acquisition [Line Items]
Discount rates	22.00%	20.00%
Customer attrition rates	23.00%	13.00%

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Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Combination and Asset Acquisition [Abstract]
Revenues	$ 3,357,877	$ 3,069,921	$ 9,090,656	$ 8,519,226
Gross profit	535,935	520,866	1,367,256	1,254,826
Selling, general and administrative expenses	(275,363)	(256,608)	(794,249)	(740,564)
Amortization of intangible assets	(22,836)	(22,843)	(68,167)	(69,742)
Net income	175,865	166,326	387,713	287,171
Net income attributable to common stock	$ 174,832	$ 165,539	$ 383,184	$ 282,718
Earnings per share attributable to common stock:
Basic (in dollars per share)	$ 1.25	$ 1.17	$ 2.73	$ 1.98
Diluted (in dollars per share)	$ 1.21	$ 1.14	$ 2.65	$ 1.94

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Per Share Information - Basic and Diluted Earnings Per Share Attributable to Common Stock (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Amounts attributable to common stock:
Net income attributable to common stock, basic	$ 174,365	$ 162,913	$ 381,159	$ 275,545
Net income attributable to common stock, diluted	$ 174,365	$ 162,913	$ 381,159	$ 275,545
Weighted average shares outstanding:
Weighted average shares outstanding for basic earnings per share attributable to common stock (in shares)	140,008,000	140,542,000	140,134,000	141,610,000
Effect of dilutive unvested non-participating stock-based awards (in shares)	4,296,000	3,821,000	4,314,000	3,375,000
Weighted average shares outstanding for diluted earnings per share attributable to common stock (in shares)	144,304,000	144,363,000	144,448,000	144,985,000

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Per Share Information - Narrative (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Weighted average shares outstanding attributable to participating securities (in shares)	500,000	1,400,000	700,000	1,700,000

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Debt Obligations - Long-term Debt Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 23, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Borrowings under senior credit facility	$ 415,851		$ 148,508
Other long-term debt	51,366		46,981
Finance leases	2,253		2,228
Total long-term debt obligations	2,941,181		1,184,825
Less — Current maturities of long-term debt	10,276		10,531
Long-term debt, net of current maturities	2,930,905		1,174,294
Senior Notes
Debt Instrument [Line Items]
Long-term debt	2,470,000
Unamortized discount and deferred financing costs related to senior notes	(28,289)		(12,892)
Senior Notes Due October 2024 | Senior Notes
Debt Instrument [Line Items]
Interest rate		0.95%
Long-term debt	$ 500,000		0
Senior Notes Due October 2030 | Senior Notes
Debt Instrument [Line Items]
Interest rate	2.90%
Long-term debt	$ 1,000,000		1,000,000
Senior Notes Due January 2032 | Senior Notes
Debt Instrument [Line Items]
Interest rate		2.35%
Long-term debt	500,000		0
Senior Notes Due October 2041 | Senior Notes
Debt Instrument [Line Items]
Interest rate		3.05%
Long-term debt	$ 500,000		$ 0

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Debt Obligations - Current Maturities of Long-Term Debt and Short-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Short-term debt	$ 13,472	$ 4,233
Current maturities of long-term debt	10,276	10,531
Current maturities of long-term debt and short-term debt	$ 23,748	$ 14,764

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Debt Obligations - Senior Notes (Details) - USD ($) $ in Thousands				3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 23, 2021	Sep. 22, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Proceeds from notes offering				$ 1,487,450	$ 990,130	$ 1,487,450	$ 990,130
Senior Notes | Senior Notes Due 2024, 2032 And 2041
Debt Instrument [Line Items]
Debt instrument		$ 1,500,000
Proceeds from notes offering		1,480,000
Redemption price, percentage	101.00%
Senior Notes | Senior Notes Due October 2024
Debt Instrument [Line Items]
Debt instrument		$ 500,000
Interest rate		0.95%
Semi-annual interest payable		$ 2,375
Senior Notes | Senior Notes Due October 2024 | Prior to commencement date
Debt Instrument [Line Items]
Redemption price, percentage						100.00%
Senior Notes | Senior Notes Due October 2024 | Following the commencement date
Debt Instrument [Line Items]
Redemption price, percentage						100.00%
Senior Notes | Senior Notes Due January 2032
Debt Instrument [Line Items]
Debt instrument		$ 500,000
Interest rate		2.35%
Semi-annual interest payable		$ 5,875
Senior Notes | Senior Notes Due January 2032 | Prior to commencement date
Debt Instrument [Line Items]
Redemption price, percentage						100.00%
Senior Notes | Senior Notes Due January 2032 | Following the commencement date
Debt Instrument [Line Items]
Redemption price, percentage						100.00%
Senior Notes | Senior Notes Due October 2041
Debt Instrument [Line Items]
Debt instrument		$ 500,000
Interest rate		3.05%
Semi-annual interest payable		$ 7,625
Senior Notes | Senior Notes Due October 2041 | Prior to commencement date
Debt Instrument [Line Items]
Redemption price, percentage						100.00%
Senior Notes | Senior Notes Due October 2041 | Following the commencement date
Debt Instrument [Line Items]
Redemption price, percentage						100.00%
Senior Notes | Senior Notes Due October 2030
Debt Instrument [Line Items]
Debt instrument			$ 1,000,000
Interest rate	2.90%			2.90%		2.90%
Proceeds from notes offering			$ 986,700
Semi-annual interest payable		$ 14,500
Senior Notes | Senior Notes Due October 2030 | Prior to commencement date
Debt Instrument [Line Items]
Redemption price, percentage						100.00%
Senior Notes | Senior Notes Due October 2030 | Following the commencement date
Debt Instrument [Line Items]
Redemption price, percentage						100.00%

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Debt Obligations - Senior Credit Facility (Details) $ in Thousands			9 Months Ended
	Oct. 13, 2021 USD ($)	Oct. 08, 2021 USD ($)	Sep. 30, 2021 USD ($) unit	Oct. 07, 2021 USD ($)	Dec. 31, 2020 USD ($)
Line of Credit Facility [Line Items]
Amount borrowed under the credit facility			$ 415,851		$ 148,508
Senior Credit Facility
Line of Credit Facility [Line Items]
Credit facility available for revolving loans or issuing new letters of credit			1,760,000
Senior Credit Facility | Canadian Dollars
Line of Credit Facility [Line Items]
Amount borrowed under the credit facility			239,700
Senior Credit Facility | U.S. Dollar
Line of Credit Facility [Line Items]
Amount borrowed under the credit facility			142,200
Senior Credit Facility | Australian Dollars
Line of Credit Facility [Line Items]
Amount borrowed under the credit facility			34,000
Senior Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Amount borrowed under the credit facility			$ 415,900
Maximum consolidated leverage ratio			3.5
Maximum consolidated leverage ratio, acquisition threshold			$ 200,000
Maximum consolidated leverage ratio in quarters where acquisition threshold is met			4.0
Subsequent fiscal periods applying alternate ration due to acquisition threshold being met | unit			4
Minimum consolidated interest coverage ratio			3.0
Senior Credit Facility | Line of Credit | Payments Due First Business Day Of Quarter In 2025
Line of Credit Facility [Line Items]
Quarterly principal payments			$ 9,400
Senior Credit Facility | Line of Credit | Payments Due First Business Day Of Quarter In 2026
Line of Credit Facility [Line Items]
Quarterly principal payments			18,800
Senior Credit Facility | Subsequent Event
Line of Credit Facility [Line Items]
Cross default provisions with debt instruments exceeding this amount		$ 300,000		$ 150,000
Senior Credit Facility | Subsequent Event | Line of Credit
Line of Credit Facility [Line Items]
Borrowing capacity		3,390,000
Senior Credit Facility | Subsequent Event | Line of Credit | Payments Due First Business Day Of Quarter In 2023 And 2024
Line of Credit Facility [Line Items]
Quarterly principal payments		$ 4,700
Senior Credit Facility | Subsequent Event | Line of Credit | Minimum
Line of Credit Facility [Line Items]
Commitment fee		0.10%
Senior Credit Facility | Subsequent Event | Line of Credit | Maximum
Line of Credit Facility [Line Items]
Commitment fee		0.275%
Senior Credit Facility | Revolving Credit Facility | Subsequent Event | Line of Credit
Line of Credit Facility [Line Items]
Borrowing capacity		$ 2,640,000		$ 2,510,000
Borrowed amount	$ 50,900
Senior Credit Facility | Revolving Credit Facility | Subsequent Event | Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		1.125%
Senior Credit Facility | Revolving Credit Facility | Subsequent Event | Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		1.75%
Senior Credit Facility | Revolving Credit Facility | Subsequent Event | Line of Credit | Alternative Currency Term Rate | Minimum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		1.125%
Senior Credit Facility | Revolving Credit Facility | Subsequent Event | Line of Credit | Alternative Currency Term Rate | Maximum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		1.75%
Senior Credit Facility | Revolving Credit Facility | Subsequent Event | Line of Credit | Base Rate | Minimum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		0.125%
Senior Credit Facility | Revolving Credit Facility | Subsequent Event | Line of Credit | Base Rate | Maximum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		0.75%
Senior Credit Facility | Delayed Draw Term Loan Facility | Subsequent Event | Line of Credit
Line of Credit Facility [Line Items]
Borrowing capacity		$ 750,000
Borrowed amount	$ 750,000
Consolidated leverage ratio, cash and cash equivalents threshold		$ 25,000
Senior Credit Facility | Delayed Draw Term Loan Facility | Subsequent Event | Line of Credit | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		1.00%
Senior Credit Facility | Delayed Draw Term Loan Facility | Subsequent Event | Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		1.00%
Senior Credit Facility | Delayed Draw Term Loan Facility | Subsequent Event | Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		1.625%
Senior Credit Facility | Delayed Draw Term Loan Facility | Subsequent Event | Line of Credit | Base Rate | Minimum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		0.00%
Senior Credit Facility | Delayed Draw Term Loan Facility | Subsequent Event | Line of Credit | Base Rate | Maximum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		0.625%
Senior Credit Facility | Delayed Draw Term Loan Facility | Subsequent Event | Line of Credit | Fed Funds Effective Rate Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		0.50%
Senior Credit Facility | Standby Letters of Credit | Subsequent Event | Line of Credit | Minimum
Line of Credit Facility [Line Items]
Letter of credit fee		1.125%
Senior Credit Facility | Standby Letters of Credit | Subsequent Event | Line of Credit | Maximum
Line of Credit Facility [Line Items]
Letter of credit fee		1.75%
Senior Credit Facility | Performance Letters of Credit | Subsequent Event | Line of Credit | Minimum
Line of Credit Facility [Line Items]
Letter of credit fee		0.675%
Senior Credit Facility | Performance Letters of Credit | Subsequent Event | Line of Credit | Maximum
Line of Credit Facility [Line Items]
Letter of credit fee		1.125%
Senior Credit Facility | Letters of Credit
Line of Credit Facility [Line Items]
Letters of credit and bank guarantees			333,900
Senior Credit Facility | Letters of Credit and Bank Guarantees | Canadian Dollars
Line of Credit Facility [Line Items]
Letters of credit and bank guarantees			$ 92,800

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Debt Obligations - Borrowings under Credit Facility and Applicable Interest Rates (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Disclosure [Abstract]
Maximum amount outstanding	$ 517,883	$ 1,462,069	$ 576,993	$ 2,023,326
Average daily amount outstanding	$ 416,089	$ 1,255,171	$ 360,609	$ 1,395,207
Weighted-average interest rate	2.13%	1.57%	2.05%	2.13%

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Debt Obligations - Bridge Facility Commitment (Details) - Bridge Facility - Bridge Loan - USD ($)		3 Months Ended
	Sep. 01, 2021	Sep. 30, 2021	Oct. 08, 2021	Sep. 23, 2021
Line of Credit Facility [Line Items]
Length of bridge facility	364 days
Borrowing capacity	$ 2,180,000,000
Remaining borrowing capacity after reductions				$ 696,100,000
Commitment fees		$ 4,400,000
Interest expense		3,100,000
Deferred financing costs		$ 1,300,000
Subsequent Event
Line of Credit Facility [Line Items]
Remaining borrowing capacity after reductions			$ 0

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Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lessee, Lease, Description [Line Items]
Future minimum lease payments for short-term leases	$ 18.7		$ 18.7
Maximum guaranteed residual value	886.9		886.9
Obligations for operating leases not yet commenced	$ 6.4		$ 6.4
Minimum
Lessee, Lease, Description [Line Items]
Lease terms of operating leases not yet commenced	1 year		1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease terms of operating leases not yet commenced	7 years		7 years
Related Parties
Lessee, Lease, Description [Line Items]
Operating lease term (up to)	10 years		10 years
Lease expense	$ 2.4	$ 4.5	$ 10.4	$ 13.2

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Leases - Components of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Finance lease cost:
Amortization of lease assets	$ 231	$ 53	$ 705	$ 515
Interest on lease liabilities	18	16	68	50
Operating lease cost	25,323	29,577	80,046	89,289
Short-term and variable lease cost	176,605	160,365	494,846	478,683
Total lease cost	$ 202,177	$ 190,011	$ 575,665	$ 568,537

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Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Operating Leases
Remainder of 2021	$ 23,964
2022	80,516
2023	58,265
2024	36,341
2025	24,449
Thereafter	36,996
Total future minimum operating and finance lease payments	260,531
Less imputed interest	(20,342)
Total lease liabilities	240,189
Finance Leases
Remainder of 2021	296
2022	872
2023	666
2024	409
2025	126
Thereafter	0
Total future minimum operating and finance lease payments	2,369
Less imputed interest	(116)
Total lease liabilities	2,253	$ 2,228
Total
Remainder of 2021	24,260
2022	81,388
2023	58,931
2024	36,750
2025	24,575
Thereafter	36,996
Total future minimum operating and finance lease payments	262,900
Less imputed interest	(20,458)
Total lease liabilities	$ 242,442

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Leases - Other Information Related to Leases (Details)	Sep. 30, 2021
Weighted average remaining lease term (in years):
Operating leases	4 years 1 month 28 days
Finance leases	2 years 10 months 24 days
Weighted average discount rate:
Operating leases	3.90%
Finance leases	3.70%

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Equity - Repurchases of Common Stock Under Stock Repurchase Programs (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Equity [Abstract]
Shares (in shares)	185	314	222	720	0	0	5,960
Amount	$ 16,828	$ 29,450	$ 17,710	$ 49,949	$ 0	$ 0	$ 200,000

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Equity - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock	$ 17,764	$ 0	$ 66,687	$ 200,000
2018 and 2020 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Amount remaining under stock repurchase programs	$ 472,800		$ 472,800

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Equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands								3 Months Ended
	Aug. 27, 2021	May 27, 2021	Mar. 25, 2021	Dec. 11, 2020	Aug. 26, 2020	May 28, 2020	Mar. 26, 2020	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.05	$ 0.05	$ 0.05	$ 0.06	$ 0.06	$ 0.06	$ 0.05	$ 0.05	$ 0.05
Cash dividends declared	$ 8,638	$ 8,650	$ 8,429	$ 8,933	$ 7,244	$ 7,182	$ 7,184

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Stock-Based Compensation - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2021 USD ($) shares	Sep. 30, 2021 USD ($) incentivePlan	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) incentivePlan shares	Sep. 30, 2020 USD ($) shares
Share-based Payment Arrangement [Abstract]
Number of equity incentive plans | incentivePlan		2		2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock compensation expense		$ 21,642	$ 21,431	$ 64,252	$ 58,323
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock compensation expense				$ 15,400	$ 17,400
Shares granted (in shares) | shares				174,000	436,000
Number of common shares issued in connection with performance units (in shares) | shares				500,000	500,000
Restricted Stock Units to be Settled in Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock, vested				$ 121,700	$ 48,800
Non-cash stock compensation expense				48,800	$ 41,000
Unrecognized compensation cost, related to unvested RSUs to be settled in common stock, total		$ 101,000		$ 101,000
Expected weighted average period to recognize compensation cost on RSUs to be settled in common stock				2 years 2 months 15 days
Shares granted (in shares) | shares				945,000	2,008,000
Restricted Stock Units to be Settled in Common Stock | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares) | shares	700,000
Fair market value at date of grant	$ 72,300
Restricted Stock Units to be Settled in Common Stock | Subsequent Event | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for RSUs to be settled in stock	5 years
Restricted Stock Units to be Settled in Common Stock | Subsequent Event | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for RSUs to be settled in stock	10 years

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Stock-Based Compensation - Summary of PSUs and RSUs to be Settled in Common Stock Activity (Details) - $ / shares shares in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Restricted Stock and RSUs to be Settled in Common Stock
Shares
Unvested, shares, beginning of period (in shares)	3,869	3,265
Shares granted (in shares)	945	2,008
Vested, shares (in shares)	(1,442)	(1,228)
Forfeited, shares (in shares)	(119)	(114)
Unvested, shares, end of period (in shares)	3,253	3,931
Weighted Average Grant Date Fair Value
Unvested, weighted average grant date fair value, beginning of period (in usd per share)	$ 37.57	$ 35.34
Weighted average grant date fair value (in dollars per share)	82.75	39.65
Vested, weighted average grant date fair value (in usd per share)	36.92	35.68
Forfeited, weighted average grant date fair value (in usd per share)	47.23	36.26
Unvested, weighted average grant date fair value, end of period (in usd per share)	$ 50.71	$ 37.41
Performance Stock Units
Shares
Unvested, shares, beginning of period (in shares)	1,047	848
Shares granted (in shares)	174	436
Vested, shares (in shares)	(268)	(238)
Forfeited, shares (in shares)	(11)	0
Unvested, shares, end of period (in shares)	942	1,046
Weighted Average Grant Date Fair Value
Unvested, weighted average grant date fair value, beginning of period (in usd per share)	$ 37.65	$ 33.20
Weighted average grant date fair value (in dollars per share)	90.44	34.59
Vested, weighted average grant date fair value (in usd per share)	38.28	17.48
Forfeited, weighted average grant date fair value (in usd per share)	36.90
Unvested, weighted average grant date fair value, end of period (in usd per share)	$ 47.27	$ 37.35

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Stock-Based Compensation - Grant Date Fair Value for Awards of Performance Units Inputs (Details) - Performance Stock Units - $ / shares	Mar. 25, 2021	Mar. 26, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Valuation date price based on closing stock prices (in dollars per share)	$ 83.48	$ 31.49
Expected volatility	36.00%	34.00%
Risk-free interest rate	0.26%	0.35%
Term in years	2 years 9 months 7 days	2 years 9 months 3 days

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Stock-Based Compensation - RSUs to be Settled in Cash (Details) - Restricted Stock Units to be Settled in Cash - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to RSUs to be settled in cash	$ 13.7	$ 5.3
Payments to settle liabilities under compensation plan	13.2	$ 4.3
Accrued liabilities under compensation plan	$ 7.4		$ 8.7

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Commitments and Contingencies - Investments in Affiliates and Other Entities (Details) $ in Millions	Sep. 30, 2021 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Committed contribution amount for investment	$ 13.6

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Commitments and Contingencies - Committed Expenditures (Details) $ in Millions	Sep. 30, 2021 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Estimated committed in first half of 2022	$ 68.4
Vehicle Fleet Committed Capital
Unrecorded Unconditional Purchase Obligation [Line Items]
Estimated committed, remainder of fiscal year	58.5
Estimated committed in 2022	$ 106.9

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Commitments and Contingencies - Legal Proceedings (Details) $ in Thousands	1 Months Ended				3 Months Ended				9 Months Ended		12 Months Ended	24 Months Ended	52 Months Ended
	Jul. 31, 2021 USD ($)	Aug. 31, 2020 USD ($)	Jul. 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2020 USD ($)	Apr. 30, 2019 USD ($)	Nov. 30, 2021 USD ($)	Aug. 31, 2019 building
Loss Contingencies [Line Items]
Gross Profit					$ (534,676)	$ (507,514)			$ (1,355,277)	$ (1,194,974)
Number of buildings with property damage | building															2
Lorenzo Benton v Telecom Network Specialists Inc
Loss Contingencies [Line Items]
Damages sought	$ 37,000
Damages awarded												$ 9,500
Reasonably possible estimate of loss					9,500				9,500
Disputed Contract Termination
Loss Contingencies [Line Items]
Charge to earnings related to legal proceedings							$ 79,200
Net receivable position on projects					120,000				120,000
Disputed Contract Termination | Adjustment | Correction of Estimated Project Costs and Percentage of Completion Method
Loss Contingencies [Line Items]
Gross Profit							$ 14,500
Redes | Telecommunication Networks Construction and Operation
Loss Contingencies [Line Items]
Term of post-construction operation and maintenance period											10 years
Redes | Disputed Contract Termination
Loss Contingencies [Line Items]
Advance payments received											$ 87,000
On-demand performance bonds											25,000
Construction costs incurred													$ 157,000
Payments received on construction contracts													$ 100,000
Net receivable position on projects					$ 87,000				$ 87,000
Redes | Disputed Contract Termination | Telecommunication Networks Construction and Operation
Loss Contingencies [Line Items]
Aggregate consideration for projects											248,000
Aggregate consideration to be paid during the construction period											151,000
Aggregate consideration to be paid during the post-construction operation and maintenance period											$ 97,000
Redes | Disputed Contract Termination | Forecast
Loss Contingencies [Line Items]
Amount claimed in arbitration														$ 190,000
QPS Engineering, LLC | Maurepas Project Dispute
Loss Contingencies [Line Items]
Damages sought								$ 22,000
PRONATEL | Disputed Contract Termination
Loss Contingencies [Line Items]
Damages sought		$ 38,000		$ 45,000
Bond proceeds received				$ 112,000
Maurepas | Maurepas Project Dispute
Loss Contingencies [Line Items]
Damages sought			$ 59,000

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Commitments and Contingencies - Concentrations of Credit Risk (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021 USD ($) Customer	Jun. 30, 2021 USD ($)	Sep. 30, 2020 USD ($) Customer	Sep. 30, 2021 USD ($) Customer	Sep. 30, 2020 USD ($) Customer	Dec. 31, 2020 USD ($) Customer
Concentration Risk [Line Items]
Provision for credit losses	$ 249		$ 1,566	$ 24,169	$ 2,910
Ownership percentage of customer in joint venture	50.00%			50.00%
Customer Concentration Risk
Concentration Risk [Line Items]
Number of customers representing ten percent or more of net receivable position | Customer	1			1		0
Number of customers representing ten percent or more of consolidated revenues | Customer	0		0	0	0
Limetree Bay Refining, LLC
Concentration Risk [Line Items]
Accounts receivable, before allowance for credit loss	$ 31,300			$ 31,300
Limetree Bay Terminals, LLC
Concentration Risk [Line Items]
Accounts receivable, before allowance for credit loss	700			$ 700
Limetree Bay Refining, LLC And Limetree Terminal, LLC
Concentration Risk [Line Items]
Provision for credit losses		$ 23,600
Customer With Joint Venture Interest | Customer Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk percentage				12.00%
Customer With Financial Difficulties | Financial Asset, Past Due | Underground Utility and Infrastructure Solutions
Concentration Risk [Line Items]
Nonpayment of receivables	17,500			$ 17,500		$ 27,500
Collection of receivables	$ 10,000

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Commitments and Contingencies - Insurance (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Commitment And Contingencies [Line Items]
Employer's liability claims subject to deductible per occurrence	$ 5,000
Worker's compensation claims per occurrence	5,000
Auto liability insurance claims deductible	15,000
General liability insurance claims deductible	15,000
Employee health care benefit plans subject to deductible per claimant	800
Insurance and other non-current liabilities	400,284	$ 391,221
Employer's Liability, Workers' Compensation, Auto Liability, General Liability and Group Health Care Claims
Commitment And Contingencies [Line Items]
Gross amount accrued for insurance claims	316,800	319,500
Insurance and other non-current liabilities	232,800	238,000
Related insurance recoveries/receivables	26,100	35,600
Related insurance recoveries/receivables included in prepaid expenses and other current assets	400	400
Long-term insurance receivables	$ 25,700	$ 35,200

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Commitments and Contingencies - Letters of Credit (Details) $ in Millions	Sep. 30, 2021 USD ($)
Letters of Credit | Senior Credit Facility
Loss Contingencies [Line Items]
Outstanding letters of credit and bank guarantees	$ 333.9

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Commitments and Contingencies - Bonds and Parent Guarantees (Details) - USD ($) $ in Millions	1 Months Ended
	Apr. 30, 2019	Sep. 30, 2021
Performance Bonds
Guarantor Obligations [Line Items]
Total amount of outstanding performance bonds		$ 3,800
Estimate | Performance Bonds
Guarantor Obligations [Line Items]
Estimated cost to complete bonded projects		$ 1,100
PRONATEL | Project Contract Termination
Guarantor Obligations [Line Items]
Bond proceeds received	$ 112

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Commitments and Contingencies - Deferred Compensation Plans (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Contributions by employer	$ 200,000	$ 200,000	$ 1,000,000	$ 1,000,000
Employer discretionary contribution amount			0	0
Deferred compensation liability, noncurrent	69,100,000		69,100,000		$ 58,200,000
Life insurance	68,400,000		68,400,000		$ 56,500,000
Change in fair market value of assets associated with deferred compensation plan	(200,000)	2,800,000	5,300,000	1,900,000
Change in fair market value of liabilities associated with deferred compensation plan	$ 0	$ 3,300,000	$ 6,000,000	$ 1,900,000

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Commitments and Contingencies - Residual Value Guarantees (Details) $ in Millions	Sep. 30, 2021 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Maximum guaranteed residual value	$ 886.9

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Commitments and Contingencies - Deferral of Employer Payroll Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Deferred payment of employer payroll taxes	$ 108.9
Percentage of deferred employer payroll taxes due, remainder of fiscal year		50.00%
Percentage of deferred employer payroll taxes due, 2022		50.00%

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Segment Information - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Segment division	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			2
Number of internal divisions | division			2
Revenues	$ 3,353,278	$ 3,020,161	$ 9,056,675	$ 8,290,487
Foreign Countries
Segment Reporting Information [Line Items]
Revenues	460,800	390,600	1,390,000	1,180,000
Property and equipment	317,600		317,600		$ 336,400
Canada
Segment Reporting Information [Line Items]
Revenues	$ 382,072	$ 320,576	$ 1,123,077	$ 917,621
Percentage of foreign revenues	83.00%	82.00%	81.00%	77.00%

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Segment Information - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 3,353,278	$ 3,020,161	$ 9,056,675	$ 8,290,487
Operating income (loss)	248,077	242,215	523,457	435,868
Depreciation	61,616	56,244	186,480	165,180
Corporate and Non-Allocated Costs
Segment Reporting Information [Line Items]
Operating income (loss)	(108,373)	(102,381)	(301,677)	(273,909)
Depreciation	3,462	4,294	12,372	12,563
Electric Power Infrastructure Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,328,468	2,107,621	6,536,363	5,667,566
Operating income (loss)	288,283	268,376	724,217	581,030
Depreciation	37,196	30,637	110,925	88,337
Electric Power Infrastructure Solutions | Operating Segments | Latin America
Segment Reporting Information [Line Items]
Operating income (loss)		(15,400)		(46,900)
Underground Utility and Infrastructure Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,024,810	912,540	2,520,312	2,622,921
Operating income (loss)	68,167	76,220	100,917	128,747
Depreciation	$ 20,958	$ 21,313	$ 63,183	$ 64,280

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Supplemental Cash Flow Information - Net Effects of Changes in Operating Assets and Liabilities, Net, on Cash Flows from Operating Activities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Supplemental Cash Flow Elements [Abstract]
Accounts and notes receivable	$ (411,890)	$ (322,579)	$ (299,857)	$ 37,541
Contract assets	(96,423)	21,950	(308,849)	121,999
Inventories	5	8,655	(6,139)	6,787
Prepaid expenses and other current assets	37,406	19,655	(4,943)	70,133
Accounts payable and accrued expenses and other non-current liabilities	230,631	235,633	289,833	147,888
Contract liabilities	(1,397)	(79,964)	(27,027)	(73,567)
Other, net	(6,027)	(7,813)	(15,205)	(20,066)
Net change in operating assets and liabilities, net of non-cash transactions	$ (247,695)	$ (124,463)	$ (372,187)	$ 290,715

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Supplemental Cash Flow Information - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Cash, Cash Equivalents and Restricted Cash [Line Items]
Cash and cash equivalents	$ 1,696,210	$ 212,473	$ 184,620	$ 216,935	$ 530,670	$ 164,798
Total cash, cash equivalents, and restricted cash reported in the statements of cash flows	1,699,096	214,715	186,808	219,102	532,853	169,745
Prepaid Expenses and Other Current Assets
Cash, Cash Equivalents and Restricted Cash [Line Items]
Restricted cash and cash equivalents	2,108	1,460	1,275	1,252	1,266	4,026
Other Assets
Cash, Cash Equivalents and Restricted Cash [Line Items]
Restricted cash and cash equivalents	$ 778	$ 782	$ 913	$ 915	$ 917	$ 921

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Supplemental Cash Flow Information - Supplemental Cash Flow Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ (25,331)	$ (29,333)	$ (79,730)	$ (88,570)
Operating cash flows from finance leases	(18)	(16)	(68)	(50)
Financing cash flows from finance leases	(168)	(102)	(688)	(525)
Lease assets obtained in exchange for lease liabilities:
Operating leases	17,081	16,619	41,686	56,970
Finance leases	112	275	398	1,158
Rental purchase option assets obtained in exchange for rental purchase option liabilities	$ 1,129	$ 3,306	$ 7,009	$ 13,229

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Supplemental Cash Flow Information - Additional Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Supplemental Cash Flow Elements [Abstract]
Interest paid	$ (2,260)	$ (8,443)	$ (26,883)	$ (30,704)
Income taxes paid	(35,740)	(86,077)	(103,225)	(149,690)
Income tax refunds	$ 2,419	$ 1,087	$ 9,211	$ 5,545

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Supplemental Cash Flow Information - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Term Loan
Cash and Cash Equivalents [Line Items]
Fair value of inventory transferred	$ 8.5

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Subsequent Event (Details) - Subsequent Event - USD ($) shares in Millions, $ in Millions	Oct. 13, 2021	Oct. 31, 2021	Oct. 08, 2021	Oct. 07, 2021
Integral Unconsolidated Affiliates
Subsequent Event [Line Items]
Equity interest		44.00%
Senior Credit Facility | Line of Credit
Subsequent Event [Line Items]
Borrowing capacity			$ 3,390.0
Delayed Draw Term Loan Facility | Senior Credit Facility | Line of Credit
Subsequent Event [Line Items]
Borrowing capacity			750.0
Revolving Credit Facility | Senior Credit Facility | Line of Credit
Subsequent Event [Line Items]
Borrowing capacity			$ 2,640.0	$ 2,510.0
Blattner Holding Company
Subsequent Event [Line Items]
Cash consideration	$ 2,290.0
Number of shares granted for acquired companies (in shares)	3.3
Value of quanta common stock issued	$ 345.4

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Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]