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Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Contract revenues	$ 815,562	$ 811,616
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	$ 507,800	$ 534,855
Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	62.30%	65.90%
Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 152,461	$ 131,351
Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	18.70%	16.20%
T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 155,301	$ 145,410
T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	19.00%	17.90%
T&D
Disaggregation of Revenue [Line Items]
Contract revenues	$ 490,395	$ 445,324
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	$ 243,000	$ 229,234
T&D | Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	49.50%	51.50%
T&D | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 136,125	$ 113,709
T&D | Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	27.80%	25.50%
T&D | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 111,270	$ 102,381
T&D | T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	22.70%	23.00%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 325,167	$ 366,292
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	$ 264,800	$ 305,621
C&I | Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	81.50%	83.40%
C&I | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 16,336	$ 17,642
C&I | Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	5.00%	4.80%
C&I | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 44,031	$ 43,029
C&I | T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	13.50%	11.80%

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