Acquisitions, Goodwill, and Other Intangible Assets, Net - 2022 and 2021 Acquisitions - Narrative (Details) $ in Thousands	1 Months Ended		3 Months Ended				9 Months Ended		12 Months Ended
	May 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) yr shares	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($) yr	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) acquisition shares	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) yr acquisition shares
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired							$ 71,841	$ 604,907
Goodwill		$ 1,520,575	$ 1,493,843		$ 1,520,575		1,493,843		$ 1,520,575
Fair value adjustment related to resolved contingent payments			(143)			$ 0	(1,459)	$ 0
Oil and Gas
Business Acquisition [Line Items]
Goodwill		436,600	445,500		436,600		445,500		436,600
Power Delivery
Business Acquisition [Line Items]
Goodwill		303,400	268,200		303,400		$ 268,200		$ 303,400
2022 Acquisitions
Business Acquisition [Line Items]
Business combinations, number of acquisitions | acquisition							4
Cash paid for acquisitions, net of cash acquired							$ 50,200
Estimated fair value of contingent consideration			3,900				3,900
2021 Acquisitions
Business Acquisition [Line Items]
Business combinations, number of acquisitions | acquisition									14
Cash paid for acquisitions, net of cash acquired									$ 1,269,000
Estimated fair value of contingent consideration		103,000			103,000				103,000
Amortizing intangible assets		608,600			608,600				608,600
Goodwill		$ 237,300			237,300				237,300
Business acquisition, goodwill, expected tax deductible amount			155,000				155,000
Bargain purchase gain									3,600
Total consideration									1,553,600
Shares transferred									$ 181,700
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low			9,000				9,000
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					$ 3,600		200
2021 Acquisitions | Minimum | Expected Term
Business Acquisition [Line Items]
Business combinations, contingent consideration, earn-out period (in years) | yr		1			1				1
2021 Acquisitions | Maximum | Expected Term
Business Acquisition [Line Items]
Business combinations, contingent consideration, earn-out period (in years) | yr		5			5				5
HMG
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired									$ 402,400
Amortizing intangible assets		$ 164,400			$ 164,400				$ 164,400
Amortizing intangible assets, weighted average useful life									11 years
Goodwill		$ 71,400			71,400				$ 71,400
Bargain purchase gain									0
Total consideration									584,100
Business acquisition, number of shares issued (in shares) | shares	133,000	1,975,000
Shares transferred									181,700
HMG | Contingent Consideration, Value Of Common Stock
Business Acquisition [Line Items]
Estimated fair value of contingent consideration		$ 65,000			65,000				$ 65,000
Total consideration	$ 29,400
Business acquisition, cash payment	$ 18,000
Business acquisition, number of shares issued (in shares) | shares	133,157
Fair value adjustment related to resolved contingent payments				$ 15,000
Realized gain (loss) included in other income			1,000				1,000
HMG | Power Delivery
Business Acquisition [Line Items]
Business acquisition, number of shares issued (in shares) | shares									2,000,000
Shares transferred									$ 182,000
HMG | Power Delivery | Contingent Consideration, Value Of Common Stock
Business Acquisition [Line Items]
Estimated fair value of contingent consideration			31,000				$ 31,000
Business acquisition, number of shares issued (in shares) | shares							160,000
Unrealized gain (loss) included in other income			1,300				$ 4,500
HMG | Power Delivery | Contingent Consideration, Collections From Acquired Receivables
Business Acquisition [Line Items]
Estimated fair value of contingent consideration			$ 3,900				$ 3,900
Business acquisition, number of shares issued (in shares) | shares							17,500
Unrealized gain (loss) included in other income							$ 1,600
HMG | Customer Relationships
Business Acquisition [Line Items]
Amortizing intangible assets		132,000			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									$ 866,600
Amortizing intangible assets		444,200			444,200				$ 444,200
Amortizing intangible assets, weighted average useful life									17 years
Goodwill		$ 165,900			$ 165,900				$ 165,900
Bargain purchase gain									3,600
Total consideration									969,500
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				1
All other | Customer Relationships
Business Acquisition [Line Items]
Amortizing intangible assets, weighted average useful life									17 years
INTREN | Power Delivery
Business Acquisition [Line Items]
Goodwill		$ 49,000			$ 49,000				$ 49,000
Total consideration									455,000
INTREN | Customer Relationships And Trade Names | Power Delivery
Business Acquisition [Line Items]
Amortizing intangible assets		$ 281,000			$ 281,000				$ 281,000
Amortizing intangible assets, weighted average useful life									20 years