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Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Contract revenues	$ 888,043	$ 939,476	$ 2,532,495	$ 2,639,708
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	$ 528,190	$ 602,986	$ 1,557,551	$ 1,712,598
Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	59.50%	64.20%	61.50%	64.90%
Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 193,186	$ 170,117	$ 502,577	$ 464,954
Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	21.70%	18.10%	19.80%	17.60%
T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 166,667	$ 166,373	$ 472,367	$ 462,156
T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	18.80%	17.70%	18.70%	17.50%
T&D
Disaggregation of Revenue [Line Items]
Contract revenues	$ 481,876	$ 548,595	$ 1,430,480	$ 1,497,655
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	$ 197,087	$ 283,440	$ 654,969	$ 774,022
T&D | Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	40.90%	51.70%	45.80%	51.70%
T&D | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 169,337	$ 143,218	$ 443,589	$ 396,855
T&D | Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	35.10%	26.10%	31.00%	26.50%
T&D | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 115,452	$ 121,937	$ 331,922	$ 326,778
T&D | T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	24.00%	22.20%	23.20%	21.80%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 406,167	$ 390,881	$ 1,102,015	$ 1,142,053
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	$ 331,103	$ 319,546	$ 902,582	$ 938,576
C&I | Fixed price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	81.50%	81.70%	81.90%	82.20%
C&I | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 23,849	$ 26,899	$ 58,988	$ 68,099
C&I | Unit price | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	5.90%	6.90%	5.40%	6.00%
C&I | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 51,215	$ 44,436	$ 140,445	$ 135,378
C&I | T&E | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	12.60%	11.40%	12.70%	11.80%

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