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Revenue Recognition - Schedule of revenue by market type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Contract revenues	$ 607,901	$ 583,214	$ 1,639,422	$ 1,500,084
Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	100.00%	100.00%	100.00%	100.00%
T&D
Disaggregation of Revenue [Line Items]
Contract revenues	$ 299,739	$ 294,940	$ 835,768	$ 823,398
T&D | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	100.00%	100.00%	100.00%	100.00%
T&D | Market Type Transmission
Disaggregation of Revenue [Line Items]
Contract revenues	$ 185,007	$ 196,083	$ 537,762	$ 553,314
T&D | Market Type Transmission | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	30.40%	33.60%	32.80%	36.90%
T&D | Market Type Distribution
Disaggregation of Revenue [Line Items]
Contract revenues	$ 114,732	$ 98,857	$ 298,006	$ 270,084
T&D | Market Type Distribution | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	18.90%	17.00%	18.20%	18.00%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 308,162	$ 288,274	$ 803,654	$ 676,686
C&I | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	100.00%	100.00%	100.00%	100.00%
C&I | Market Type Electrical construction
Disaggregation of Revenue [Line Items]
Contract revenues	$ 308,162	$ 288,274	$ 803,654	$ 676,686
C&I | Market Type Electrical construction | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	50.70%	49.40%	49.00%	45.10%

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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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