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Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Contract revenues	$ 811,616	$ 636,624
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	$ 534,855	$ 369,481
Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	65.90%	58.00%
Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 131,351	$ 119,124
Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	16.20%	18.70%
T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 145,410	$ 148,019
T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	17.90%	23.30%
T&D
Disaggregation of Revenue [Line Items]
Contract revenues	$ 445,324	$ 364,856
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	$ 229,234	$ 150,904
T&D | Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	51.50%	41.40%
T&D | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 113,709	$ 104,321
T&D | Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	25.50%	28.60%
T&D | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 102,381	$ 109,631
T&D | T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	23.00%	30.00%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 366,292	$ 271,768
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	$ 305,621	$ 218,577
C&I | Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	83.40%	80.40%
C&I | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 17,642	$ 14,803
C&I | Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	4.80%	5.40%
C&I | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 43,029	$ 38,388
C&I | T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	11.80%	14.20%

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