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Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Contract revenues	$ 649,573	$ 513,051	$ 1,242,059	$ 1,031,521
Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	100.00%	100.00%	100.00%	100.00%
Fixed price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 416,657	$ 314,012	$ 796,297	$ 653,553
Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	64.10%	61.20%	64.10%	63.40%
Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 108,436	$ 103,676	$ 212,136	$ 185,062
Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	16.70%	20.20%	17.10%	17.90%
T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 91,237	$ 83,384	$ 175,897	$ 167,237
T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	14.10%	16.30%	14.20%	16.20%
Other
Disaggregation of Revenue [Line Items]
Contract revenues	$ 33,243	$ 11,979	$ 57,729	$ 25,669
Other | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	5.10%	2.30%	4.60%	2.50%
T&D
Disaggregation of Revenue [Line Items]
Contract revenues	$ 326,831	$ 276,759	$ 641,739	$ 536,029
T&D | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	100.00%	100.00%	100.00%	100.00%
T&D | Fixed price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 157,439	$ 126,350	$ 309,370	$ 247,352
T&D | Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	48.20%	45.70%	48.20%	46.10%
T&D | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 89,953	$ 84,629	$ 175,222	$ 147,939
T&D | Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	27.50%	30.60%	27.30%	27.60%
T&D | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 73,099	$ 61,632	$ 143,377	$ 129,683
T&D | T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	22.40%	22.30%	22.30%	24.20%
T&D | Other
Disaggregation of Revenue [Line Items]
Contract revenues	$ 6,340	$ 4,148	$ 13,770	$ 11,055
T&D | Other | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	1.90%	1.40%	2.20%	2.10%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 322,742	$ 236,292	$ 600,320	$ 495,492
C&I | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	100.00%	100.00%	100.00%	100.00%
C&I | Fixed price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 259,218	$ 187,662	$ 486,927	$ 406,201
C&I | Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	80.30%	79.40%	81.10%	82.00%
C&I | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 18,483	$ 19,047	$ 36,914	$ 37,123
C&I | Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	5.70%	8.10%	6.20%	7.50%
C&I | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 18,138	$ 21,752	$ 32,520	$ 37,554
C&I | T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	5.60%	9.20%	5.40%	7.60%
C&I | Other
Disaggregation of Revenue [Line Items]
Contract revenues	$ 26,903	$ 7,831	$ 43,959	$ 14,614
C&I | Other | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	8.40%	3.30%	7.30%	2.90%

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