Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment reporting information
Revenue	$ 1,022,948	$ 881,610	$ 1,807,333	$ 1,699,939
% of Total Revenue	100.00%	100.00%	100.00%	100.00%
Gross Profit	$ 92,109	$ 113,026	$ 148,594	$ 193,207
% of Revenue	9.00%	12.80%	8.20%	11.40%
Utilities
Segment reporting information
Revenue	$ 476,121	$ 425,421	$ 834,849	$ 760,433
% of Total Revenue	46.50%	48.30%	46.20%	44.70%
Gross Profit	$ 40,356	$ 48,849	$ 62,709	$ 70,565
% of Revenue	8.50%	11.50%	7.50%	9.30%
Energy/Renewables
Segment reporting information
Revenue	$ 486,349	$ 335,010	$ 845,399	$ 687,874
% of Total Revenue	47.60%	38.00%	46.80%	40.50%
Gross Profit	$ 53,143	$ 33,232	$ 93,074	$ 75,904
% of Revenue	10.90%	9.90%	11.00%	11.00%
Pipeline
Segment reporting information
Revenue	$ 60,478	$ 121,179	$ 127,085	$ 251,632
% of Total Revenue	5.90%	13.70%	7.00%	14.80%
Gross Profit	$ (1,390)	$ 30,945	$ (7,189)	$ 46,738
% of Revenue	(2.30%)	25.50%	(5.70%)	18.60%