Revenue Recognition - Schedule of revenue by market type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Contract revenues	$ 939,476	$ 799,848	$ 2,639,708	$ 2,144,586
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	$ 548,595	$ 452,014	$ 1,497,655	$ 1,232,105
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	$ 357,708	$ 264,022	$ 978,078	$ 735,707
T&D | Transmission | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	38.10%	33.00%	37.00%	34.30%
T&D | Distribution
Disaggregation of Revenue [Line Items]
Contract revenues	$ 190,887	$ 187,992	$ 519,577	$ 496,398
T&D | Distribution | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	20.30%	23.50%	19.70%	23.20%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 390,881	$ 347,834	$ 1,142,053	$ 912,481
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	$ 390,881	$ 347,834	$ 1,142,053	$ 912,481
C&I | Electrical construction | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	41.60%	43.50%	43.30%	42.50%