Revenue Recognition - Schedule of revenue by market type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Contract revenues	$ 888,616	$ 708,114	$ 1,700,232	$ 1,344,738
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	$ 503,737	$ 415,235	$ 949,060	$ 780,091
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	$ 322,272	$ 250,078	$ 620,370	$ 471,685
T&D | Transmission | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	36.30%	35.30%	36.50%	35.10%
T&D | Distribution
Disaggregation of Revenue [Line Items]
Contract revenues	$ 181,465	$ 165,157	$ 328,690	$ 308,406
T&D | Distribution | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	20.40%	23.30%	19.30%	22.90%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 384,879	$ 292,879	$ 751,172	$ 564,647
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	$ 384,879	$ 292,879	$ 751,172	$ 564,647
C&I | Electrical construction | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	43.30%	41.40%	44.20%	42.00%