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Revenue Recognition - Schedule of Revenue by Market Type (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Contract revenues	$ 607,970	$ 607,901	$ 513,051	$ 518,470	$ 571,075	$ 583,214	$ 448,776	$ 468,094	$ 2,247,392	$ 2,071,159	$ 1,531,169
Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									100.00%	100.00%	100.00%
T&D
Disaggregation of Revenue [Line Items]
Contract revenues									$ 1,154,378	$ 1,134,411	$ 893,108
T&D | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									100.00%	100.00%	100.00%
T&D | Transmission
Disaggregation of Revenue [Line Items]
Contract revenues									$ 745,599	$ 772,609	$ 559,467
T&D | Transmission | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									33.20%	37.30%	36.50%
T&D | Distribution
Disaggregation of Revenue [Line Items]
Contract revenues									$ 408,779	$ 361,802	$ 333,641
T&D | Distribution | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									18.20%	17.50%	21.80%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues									$ 1,093,014	$ 936,748	$ 638,061
C&I | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									100.00%	100.00%	100.00%
C&I | Electrical construction
Disaggregation of Revenue [Line Items]
Contract revenues									$ 1,093,014	$ 936,748	$ 638,061
C&I | Electrical construction | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									48.60%	45.20%	41.70%

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