Acquisitions, Goodwill, and Other Intangible Assets - 2022 and 2021 Acquisitions - Narrative (Details) $ in Thousands	1 Months Ended		3 Months Ended			12 Months Ended
	Jan. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) yr shares	Mar. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) yr	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) yr acquisition shares
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired			$ 21,840		$ 88,646
Goodwill		$ 1,520,575	1,504,341	$ 1,520,575		$ 1,520,575
Oil and Gas
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired	$ 13,000
Goodwill		436,600	447,200	436,600		436,600
Power Delivery
Business Acquisition [Line Items]
Goodwill		303,400	279,800	303,400		303,400
2021 Acquisitions
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired						1,289,100
Estimated fair value of contingent consideration		100,000		100,000		$ 100,000
Business combinations, number of acquisitions | acquisition						14
Amortizing intangible assets		608,800		608,800		$ 608,800
Goodwill		$ 257,800		257,800		257,800
Business acquisition, goodwill, expected tax deductible amount			147,000
Bargain purchase gain						(3,500)
Shares transferred						181,700
Total consideration						$ 1,570,500
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low			13,000
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high			133,000
2021 Acquisitions | Power Delivery
Business Acquisition [Line Items]
Bargain purchase gain				$ (3,500)
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						$ 416,900
Amortizing intangible assets		$ 164,600		$ 164,600		$ 164,600
Amortizing intangible assets, weighted average useful life						11 years
Goodwill		$ 91,000		91,000		$ 91,000
Bargain purchase gain						$ 0
Business acquisition, number of shares issued (in shares) | shares		1,975,232				2,000,000
Shares transferred						$ 181,700
Total consideration						598,600
HMG | Contingent Consideration, Value Of Common Stock
Business Acquisition [Line Items]
Estimated fair value of contingent consideration			$ 65,000
Business acquisition, number of shares issued (in shares) | shares			295,000
Shares transferred			$ 27,000
HMG | Contingent Consideration, Collection Of Acquired Receivables
Business Acquisition [Line Items]
Estimated fair value of contingent consideration			$ 30,000
Business acquisition, number of shares issued (in shares) | shares			135,000
Shares transferred			$ 12,000
HMG | Maximum | Contingent Consideration, Value Of Common Stock
Business Acquisition [Line Items]
Business acquisition, number of shares issued (in shares) | shares			390,000
Shares transferred			$ 36,000
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						$ 872,200
Amortizing intangible assets		444,200		444,200		$ 444,200
Amortizing intangible assets, weighted average useful life						17 years
Goodwill		$ 166,800		$ 166,800		$ 166,800
Bargain purchase gain						(3,500)
Shares transferred						0
Total consideration						971,900
All other | Power Delivery
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired						78,000
Total consideration						$ 452,000
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
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
2022 Acquisitions | Oil and Gas
Business Acquisition [Line Items]
Estimated fair value of contingent consideration	$ 1,700