Acquisitions, Goodwill and Other Intangible Assets - Rollforward of Goodwill by Segment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill		$ 1,645,300
Accumulated impairment loss		(124,700)
Goodwill, net	$ 1,504,341	1,520,575
Goodwill [Roll Forward]
Goodwill, net, beginning balance	1,520,575
Goodwill, acquired during period	3,000
Goodwill, measurement period adjustments	(19,500)
Goodwill, currency translation gains (losses)	200
Goodwill, net, ending balance	1,504,341	1,520,575
HMG
Goodwill [Line Items]
Goodwill, net		91,000
Goodwill [Roll Forward]
Goodwill, net, beginning balance	91,000
Goodwill, net, ending balance		91,000
Communications
Goodwill [Line Items]
Goodwill		614,500
Accumulated impairment loss		0
Goodwill, net	609,100	614,500
Goodwill [Roll Forward]
Goodwill, net, beginning balance	614,500
Goodwill, acquired during period	0
Goodwill, measurement period adjustments	(5,400)
Goodwill, currency translation gains (losses)	0
Goodwill, net, ending balance	609,100	614,500
Communications \| HMG
Goodwill [Roll Forward]
Goodwill, period increase (decrease)		13,000
Clean Energy and Infrastructure
Goodwill [Line Items]
Goodwill		166,100
Accumulated impairment loss
Goodwill, net	168,200	166,100
Goodwill [Roll Forward]
Goodwill, net, beginning balance	166,100
Goodwill, acquired during period	0
Goodwill, measurement period adjustments	2,100
Goodwill, currency translation gains (losses)	0
Goodwill, net, ending balance	168,200	166,100
Oil and Gas
Goodwill [Line Items]
Goodwill		561,300
Accumulated impairment loss		(124,700)
Goodwill, net	447,200	436,600
Goodwill [Roll Forward]
Goodwill, net, beginning balance	436,600
Goodwill, acquired during period	3,000
Goodwill, measurement period adjustments	7,400
Goodwill, currency translation gains (losses)	200
Goodwill, net, ending balance	447,200	436,600
Oil and Gas \| HMG
Goodwill [Roll Forward]
Goodwill, period increase (decrease)		10,400
Power Delivery
Goodwill [Line Items]
Goodwill		303,400
Accumulated impairment loss		0
Goodwill, net	279,800	303,400
Goodwill [Roll Forward]
Goodwill, net, beginning balance	303,400
Goodwill, acquired during period	0
Goodwill, measurement period adjustments	(23,600)
Goodwill, currency translation gains (losses)	0
Goodwill, net, ending balance	$ 279,800	303,400
Power Delivery \| HMG
Goodwill [Roll Forward]
Goodwill, period increase (decrease)		$ (23,400)

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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