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Revenue Recognition - Schedule of revenue by market type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Contract revenues	$ 592,486	$ 518,470
Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	100.00%	100.00%
T&D
Disaggregation of Revenue [Line Items]
Contract revenues	$ 314,908	$ 259,270
T&D | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	100.00%	100.00%
T&D | Transmission
Disaggregation of Revenue [Line Items]
Contract revenues	$ 211,227	$ 171,566
T&D | Transmission | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	35.70%	33.10%
T&D | Distribution
Disaggregation of Revenue [Line Items]
Contract revenues	$ 103,681	$ 87,704
T&D | Distribution | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	17.50%	16.90%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 277,578	$ 259,200
C&I | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	100.00%	100.00%
C&I | Electrical construction
Disaggregation of Revenue [Line Items]
Contract revenues	$ 277,578	$ 259,200
C&I | Electrical construction | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	46.80%	50.00%

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