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Revenue Recognition - Schedule of revenue by market type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Contract revenues	$ 950,400	$ 888,043	$ 2,684,345	$ 2,532,495
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	$ 503,436	$ 481,876	$ 1,471,479	$ 1,430,480
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	$ 293,022	$ 276,663	$ 868,244	$ 873,077
T&D | Transmission | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	30.80%	31.20%	32.30%	34.50%
T&D | Distribution
Disaggregation of Revenue [Line Items]
Contract revenues	$ 210,414	$ 205,213	$ 603,235	$ 557,403
T&D | Distribution | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	22.20%	23.10%	22.50%	22.00%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 446,964	$ 406,167	$ 1,212,866	$ 1,102,015
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	$ 446,964	$ 406,167	$ 1,212,866	$ 1,102,015
C&I | Electrical construction | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	47.00%	45.70%	45.20%	43.50%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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