Acquisitions, Goodwill and Other Intangible Assets, Net - Rollforward of Goodwill by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill, gross	$ 2,161,700		$ 1,366,800
Accumulated impairment loss	(116,700)		(123,800)
Goodwill, net	2,045,041	$ 1,520,575	1,243,000
Goodwill [Roll Forward]
Goodwill, net, beginning balance	1,520,575	1,243,000
Additions from new business combinations	544,700	277,300
Measurement period adjustments, net	(19,300)	100
Currency translation adjustments	(1,000)	200
Goodwill, net, ending balance	2,045,041	1,520,575	1,243,000
HMG
Goodwill [Line Items]
Goodwill, net	71,400
Goodwill [Roll Forward]
Goodwill, net, ending balance	71,400
Communications
Goodwill [Line Items]
Goodwill, gross	606,100		562,100
Accumulated impairment loss	0		0
Goodwill, net	606,100	614,500	562,100
Goodwill [Roll Forward]
Goodwill, net, beginning balance	614,500	562,100
Additions from new business combinations	3,000	52,300
Measurement period adjustments, net	(11,400)	100
Currency translation adjustments	0	0
Goodwill, net, ending balance	606,100	614,500	562,100
Clean Energy and Infrastructure
Goodwill [Line Items]
Goodwill, gross	703,300		152,700
Accumulated impairment loss	0		0
Goodwill, net	703,300	166,100	152,700
Goodwill [Roll Forward]
Goodwill, net, beginning balance	166,100	152,700
Additions from new business combinations	535,200	13,400
Measurement period adjustments, net	2,000	0
Currency translation adjustments	0	0
Goodwill, net, ending balance	703,300	166,100	152,700
Oil and Gas
Goodwill [Line Items]
Goodwill, gross	582,200		501,900
Accumulated impairment loss	(116,700)		(123,800)
Goodwill, net	465,500	436,600	378,100
Goodwill [Roll Forward]
Goodwill, net, beginning balance	436,600	378,100
Additions from new business combinations	4,600	58,300
Measurement period adjustments, net	25,300	0
Currency translation adjustments	(1,000)	200
Goodwill, net, ending balance	465,500	436,600	378,100
Oil and Gas | HMG
Goodwill [Roll Forward]
Goodwill, period increase (decrease)		10,400
Power Delivery
Goodwill [Line Items]
Goodwill, gross	270,100		150,100
Accumulated impairment loss	0		0
Goodwill, net	270,100	303,400	150,100
Goodwill [Roll Forward]
Goodwill, net, beginning balance	303,400	150,100
Additions from new business combinations	1,900	153,300
Measurement period adjustments, net	(35,200)	0
Currency translation adjustments	0	0
Goodwill, net, ending balance	$ 270,100	303,400	$ 150,100
Power Delivery | HMG
Goodwill [Roll Forward]
Goodwill, period increase (decrease)		(23,400)
Communications Segment | HMG
Goodwill [Roll Forward]
Goodwill, period increase (decrease)		$ 13,000