Acquisitions, Goodwill, and Other Intangible Assets - 2022 and 2021 Acquisitions - Narrative (Details) $ in Thousands	1 Months Ended		3 Months Ended			6 Months Ended		12 Months Ended
	May 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) yr shares	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) acquisition shares	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) yr acquisition shares
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired						$ 44,908	$ 589,055
Goodwill		$ 1,520,575	$ 1,484,600			1,484,600		$ 1,520,575
Fair value adjustment related to resolved contingent payments			(1,025)		$ 0	(1,025)	$ 0
Oil and Gas
Business Acquisition [Line Items]
Goodwill		436,600	447,100			447,100		436,600
Power Delivery
Business Acquisition [Line Items]
Goodwill		303,400	264,500			$ 264,500		$ 303,400
2022 Acquisitions
Business Acquisition [Line Items]
Business combinations, number of acquisitions | acquisition						2
Cash paid for acquisitions, net of cash acquired						$ 15,800
Estimated fair value of contingent consideration			1,800			1,800
2021 Acquisitions
Business Acquisition [Line Items]
Business combinations, number of acquisitions | acquisition								14
Cash paid for acquisitions, net of cash acquired								$ 1,269,700
Estimated fair value of contingent consideration		103,000						103,000
Amortizing intangible assets		608,800						608,800
Goodwill		$ 234,500						234,500
Business acquisition, goodwill, expected tax deductible amount			149,000			149,000
Bargain purchase gain								3,600
Total consideration								1,554,300
Shares transferred								181,700
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low			4,000			4,000
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high			120,000			120,000
2021 Acquisitions | Power Delivery
Business Acquisition [Line Items]
Bargain purchase gain						200		$ 3,600
2021 Acquisitions | Minimum | Expected Term
Business Acquisition [Line Items]
Business combinations, contingent consideration, earn-out period (in years) | yr		1						1
2021 Acquisitions | Maximum | Expected Term
Business Acquisition [Line Items]
Business combinations, contingent consideration, earn-out period (in years) | yr		5						5
HMG
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired								$ 402,400
Amortizing intangible assets		$ 164,600						$ 164,600
Amortizing intangible assets, weighted average useful life								11 years
Goodwill		$ 68,300						$ 68,300
Bargain purchase gain								0
Total consideration								$ 584,100
Business acquisition, number of shares issued (in shares) | shares	133,000	1,975,000						2,000,000
Shares transferred								$ 181,700
HMG | Contingent Consideration, Value Of Common Stock
Business Acquisition [Line Items]
Estimated fair value of contingent consideration		$ 65,000	32,000			$ 32,000		65,000
Total consideration	$ 29,400
Business acquisition, cash payment	$ 18,000
Business acquisition, number of shares issued (in shares) | shares	133,157					160,000
Fair value adjustment related to resolved contingent payments			15,000
Realized gain (loss) included in other income			1,000			$ 1,000
Unrealized gain (loss) included in other income			$ 3,200			$ 3,200
HMG | Customer Relationships
Business Acquisition [Line Items]
Amortizing intangible assets		132,000						$ 132,000
Amortizing intangible assets, weighted average useful life								12 years
All other
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired								$ 867,300
Amortizing intangible assets		444,200						$ 444,200
Amortizing intangible assets, weighted average useful life								17 years
Goodwill		$ 166,200						$ 166,200
Bargain purchase gain								3,600
Total consideration								970,200
Shares transferred								0
All other | Power Delivery
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired								$ 78,000
All other | Minimum | Expected Term | Power Delivery
Business Acquisition [Line Items]
Business combinations, contingent consideration, earn-out period (in years) | yr		1						1
All other | Customer Relationships
Business Acquisition [Line Items]
Amortizing intangible assets, weighted average useful life								17 years
INTREN
Business Acquisition [Line Items]
Total consideration				$ 455,000
INTREN | Power Delivery
Business Acquisition [Line Items]
Goodwill		$ 49,000						$ 49,000
INTREN | Customer Relationships And Trade Names | Power Delivery
Business Acquisition [Line Items]
Amortizing intangible assets		$ 284,000						$ 284,000
Amortizing intangible assets, weighted average useful life								20 years