Segments and Related Information - Schedule of Financial Information by Reportable Segment - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue:
Revenue	$ 2,404,332	$ 1,698,279	$ 6,142,414	$ 4,684,180
Communications | Customer Concentration Risk | Revenue | Utilities
Revenue:
Utilities customers, percentage of communications segment revenue	22.20%	15.70%	21.00%	15.30%
Reportable Segments | Communications
Revenue:
Revenue	$ 670,300	$ 645,400	$ 1,869,300	$ 1,943,800
Reportable Segments | Clean Energy and Infrastructure
Revenue:
Revenue	518,400	468,900	1,350,300	1,181,400
Reportable Segments | Oil and Gas
Revenue:
Revenue	858,400	462,500	2,205,300	1,190,100
Reportable Segments | Electrical Transmission
Revenue:
Revenue	365,300	128,500	731,400	380,700
Reportable Segments | Other
Revenue:
Revenue	0	100	0	200
Eliminations
Revenue:
Revenue	$ (8,100)	$ (7,100)	$ (13,900)	$ (12,000)