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Revenue Recognition - Schedule of revenue by market 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%
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 | Transmission
Disaggregation of Revenue [Line Items]
Contract revenues	$ 276,663	$ 357,708	$ 873,077	$ 978,078
T&D | Transmission | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	31.20%	38.10%	34.50%	37.00%
T&D | Distribution
Disaggregation of Revenue [Line Items]
Contract revenues	$ 205,213	$ 190,887	$ 557,403	$ 519,577
T&D | Distribution | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	23.10%	20.30%	22.00%	19.70%
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 | Electrical construction
Disaggregation of Revenue [Line Items]
Contract revenues	$ 406,167	$ 390,881	$ 1,102,015	$ 1,142,053
C&I | Electrical construction | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	45.70%	41.60%	43.50%	43.30%

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