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Revenue Recognition - Schedule of revenue by market type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Contract revenues	$ 649,573	$ 513,051	$ 1,242,059	$ 1,031,521
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	$ 326,831	$ 276,759	$ 641,739	$ 536,029
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	$ 210,946	$ 181,189	$ 422,173	$ 352,755
T&D | Transmission | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	32.50%	35.30%	34.00%	34.20%
T&D | Distribution
Disaggregation of Revenue [Line Items]
Contract revenues	$ 115,885	$ 95,570	$ 219,566	$ 183,274
T&D | Distribution | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	17.80%	18.60%	17.70%	17.80%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 322,742	$ 236,292	$ 600,320	$ 495,492
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	$ 322,742	$ 236,292	$ 600,320	$ 495,492
C&I | Electrical construction | Product concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	49.70%	46.10%	48.30%	48.00%

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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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