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Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Contract revenues	$ 708,114	$ 649,573	$ 1,344,738	$ 1,242,059
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	$ 436,616	$ 416,634	$ 806,097	$ 796,371
Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	61.70%	64.10%	59.90%	64.10%
Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 135,541	$ 108,427	$ 254,665	$ 212,199
Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	19.10%	16.70%	19.00%	17.10%
T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 135,957	$ 124,512	$ 283,976	$ 233,489
T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	19.20%	19.20%	21.10%	18.80%
T&D
Disaggregation of Revenue [Line Items]
Contract revenues	$ 415,235	$ 326,831	$ 780,091	$ 641,739
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	$ 192,934	$ 157,421	$ 343,838	$ 309,488
T&D | Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	46.50%	48.20%	44.10%	48.20%
T&D | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 117,609	$ 89,944	$ 221,930	$ 175,289
T&D | Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	28.30%	27.50%	28.40%	27.30%
T&D | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 104,692	$ 79,466	$ 214,323	$ 156,962
T&D | T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	25.20%	24.30%	27.50%	24.50%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 292,879	$ 322,742	$ 564,647	$ 600,320
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	$ 243,682	$ 259,213	$ 462,259	$ 486,883
C&I | Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	83.20%	80.30%	81.90%	81.10%
C&I | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 17,932	$ 18,483	$ 32,735	$ 36,910
C&I | Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	6.10%	5.70%	5.80%	6.20%
C&I | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 31,265	$ 45,046	$ 69,653	$ 76,527
C&I | T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	10.70%	14.00%	12.30%	12.70%

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