Revenue Recognition - Schedule of revenue by market type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Contract revenues	$ 799,848	$ 610,182	$ 2,144,586	$ 1,852,241
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	$ 452,014	$ 306,546	$ 1,232,105	$ 948,285
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	$ 264,022	$ 165,953	$ 735,707	$ 588,126
T&D | Transmission | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	33.00%	27.20%	34.30%	31.80%
T&D | Distribution
Disaggregation of Revenue [Line Items]
Contract revenues	$ 187,992	$ 140,593	$ 496,398	$ 360,159
T&D | Distribution | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	23.50%	23.00%	23.20%	19.40%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 347,834	$ 303,636	$ 912,481	$ 903,956
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	$ 347,834	$ 303,636	$ 912,481	$ 903,956
C&I | Electrical construction | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	43.50%	49.80%	42.50%	48.80%