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Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Contract revenues	$ 636,624	$ 592,486
Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	100.00%	100.00%
Fixed price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 369,481	$ 379,737
Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	58.00%	64.10%
Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 119,124	$ 103,772
Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	18.70%	17.50%
T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 148,019	$ 108,977
T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	23.30%	18.40%
T&D
Disaggregation of Revenue [Line Items]
Contract revenues	$ 364,856	$ 314,908
T&D | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	100.00%	100.00%
T&D | Fixed price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 150,904	$ 152,067
T&D | Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	41.40%	48.30%
T&D | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 104,321	$ 85,345
T&D | Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	28.60%	27.10%
T&D | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 109,631	$ 77,496
T&D | T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	30.00%	24.60%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 271,768	$ 277,578
C&I | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	100.00%	100.00%
C&I | Fixed price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 218,577	$ 227,670
C&I | Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	80.40%	82.00%
C&I | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 14,803	$ 18,427
C&I | Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	5.40%	6.60%
C&I | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 38,388	$ 31,481
C&I | T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	14.20%	11.40%

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