Debt Obligations - Senior Credit Facility (Details)					10 Months Ended	12 Months Ended
	Aug. 23, 2022	Aug. 22, 2022	Oct. 07, 2021	Sep. 22, 2020	Aug. 22, 2022	Dec. 31, 2022 USD ($) unit	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Line of Credit Facility [Line Items]
Borrowings under senior credit facility						$ 786,910,000	$ 1,199,841,000
Amortization expense related to capitalized debt issuance costs						12,712,000	8,405,000	$ 5,126,000
Senior Credit Facility
Line of Credit Facility [Line Items]
Option to increase revolving commitments under the credit agreement						400,000,000
Reduction in Quanta's funded indebtedness reduced by cash and cash equivalents in excess of this amount						25,000,000
Credit facility available for revolving loans or issuing new letters of credit						2,000,000,000
Senior Credit Facility | Canadian Dollars
Line of Credit Facility [Line Items]
Borrowings under senior credit facility						$ 36,900,000
Senior Credit Facility | Excess of Federal Funds Rate
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	0.50%		0.50%
Senior Credit Facility | Excess of Euro Currency Rate
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate			1.00%
Senior Credit Facility | Minimum
Line of Credit Facility [Line Items]
Commitment fee	0.10%		0.275%	0.20%	0.10%
Senior Credit Facility | Minimum | Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate			1.125%
Senior Credit Facility | Minimum | Excess of Base Rate Domestic Borrowings Only
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate			0.125%
Senior Credit Facility | Minimum | Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate			1.125%
Senior Credit Facility | Maximum
Line of Credit Facility [Line Items]
Commitment fee	0.275%		0.425%	0.40%	0.275%
Senior Credit Facility | Maximum | Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate			2.00%
Senior Credit Facility | Maximum | Excess of Base Rate Domestic Borrowings Only
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate			1.00%
Senior Credit Facility | Maximum | Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate			2.00%
Senior Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio						3.5
Acquisition threshold for leverage ratio						$ 200,000,000
Maximum consolidated leverage ratio permissible under credit agreement						4.0
Number of fiscal quarters applicable to updated acquisition ratio | unit						4
Minimum consolidated interest coverage ratio						3.0
Amount of availability under the credit agreement and/or cash and cash equivalents on hand that must be present to allow for cash payments of dividends and stock repurchases						$ 100,000,000
Cross default provisions with debt instruments exceeding this amount						300,000,000
Borrowings under senior credit facility						36,900,000
Deferred financing costs						8,300,000	$ 10,100,000
Senior Credit Facility | Term Loan | Payments Due First Business Day Of Quarter In 2023 And 2024
Line of Credit Facility [Line Items]
Quarterly principal payments						4,700,000
Senior Credit Facility | Term Loan | Payments Due First Business Day Of Quarter In 2025
Line of Credit Facility [Line Items]
Quarterly principal payments						9,400,000
Senior Credit Facility | Term Loan | Payments Due First Business Day Of Quarter In 2026
Line of Credit Facility [Line Items]
Quarterly principal payments						18,800,000
Senior Credit Facility | Term Loan | Line of Credit
Line of Credit Facility [Line Items]
Senior secured revolving credit facility						750,000,000
Borrowings under senior credit facility						750,000,000
Interest rate floor	1.00%
Senior Credit Facility | Term Loan | Line of Credit | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.00%
Senior Credit Facility | Term Loan | 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 | Term Loan | 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 | Term Loan | Line of Credit | Minimum | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.00%
Senior Credit Facility | Term Loan | Line of Credit | Minimum | Base Rate
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	0.00%	0.00%
Senior Credit Facility | Term Loan | Line of Credit | Minimum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		1.00%
Senior Credit Facility | Term Loan | Line of Credit | Maximum | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.625%
Senior Credit Facility | Term Loan | Line of Credit | Maximum | Base Rate
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	0.625%	0.625%
Senior Credit Facility | Term Loan | Line of Credit | Maximum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		1.625%
Senior Credit Facility | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Senior secured revolving credit facility						2,640,000,000
Senior Credit Facility | Revolving Credit Facility | Line of Credit | Minimum | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.125%
Senior Credit Facility | Revolving Credit Facility | Line of Credit | Minimum | Base Rate
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	0.125%				0.125%
Senior Credit Facility | Revolving Credit Facility | Line of Credit | Minimum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate					1.125%
Senior Credit Facility | Revolving Credit Facility | Line of Credit | Minimum | Alternative Currency Term Rate
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.125%				1.125%
Senior Credit Facility | Revolving Credit Facility | Line of Credit | Maximum | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.75%
Senior Credit Facility | Revolving Credit Facility | Line of Credit | Maximum | Base Rate
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	0.75%				0.75%
Senior Credit Facility | Revolving Credit Facility | Line of Credit | Maximum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate					1.75%
Senior Credit Facility | Revolving Credit Facility | Line of Credit | Maximum | Alternative Currency Term Rate
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.75%				1.75%
Senior Credit Facility | Standby Letters of Credit | Minimum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.125%		1.125%		1.125%
Senior Credit Facility | Standby Letters of Credit | Maximum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.75%		2.00%		1.75%
Senior Credit Facility | Performance Letters of Credit | Minimum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	0.675%		0.675%		0.675%
Senior Credit Facility | Performance Letters of Credit | Maximum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.125%		1.15%		1.125%
Senior Credit Facility | Letters of Credit
Line of Credit Facility [Line Items]
Letters of credit and bank guarantees under the credit facility						227,800,000
Senior Credit Facility | Letters of Credit and Bank Guarantees | Canadian Dollars
Line of Credit Facility [Line Items]
Letters of credit and bank guarantees under the credit facility						99,300,000
Senior Credit Facility | Letters of Credit and Bank Guarantees | U.S. Dollars
Line of Credit Facility [Line Items]
Letters of credit and bank guarantees under the credit facility						128,500,000
Surety-Backed Letters Of Credit
Line of Credit Facility [Line Items]
Limit on surety-backed line of credit						300,000,000
Letters of credit and bank guarantees under the credit facility						$ 189,900,000