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Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Contract revenues	$ 833,620	$ 815,562
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	$ 467,255	$ 507,800
Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	56.00%	62.30%
Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 169,769	$ 152,461
Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	20.40%	18.70%
T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 196,596	$ 155,301
T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	23.60%	19.00%
T&D
Disaggregation of Revenue [Line Items]
Contract revenues	$ 461,769	$ 490,395
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	$ 173,450	$ 243,000
T&D | Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	37.60%	49.50%
T&D | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 152,102	$ 136,125
T&D | Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	32.90%	27.80%
T&D | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 136,217	$ 111,270
T&D | T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	29.50%	22.70%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 371,851	$ 325,167
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	$ 293,805	$ 264,800
C&I | Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	79.00%	81.50%
C&I | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 17,667	$ 16,336
C&I | Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	4.80%	5.00%
C&I | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 60,379	$ 44,031
C&I | T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	16.20%	13.50%

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