Revenue Recognition - Schedule of Revenue by Market Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Contract revenues	$ 2,498,289	$ 2,247,392	$ 2,071,159
Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	100.00%	100.00%	100.00%
T&D
Disaggregation of Revenue [Line Items]
Contract revenues	$ 1,301,587	$ 1,154,378	$ 1,134,411
T&D | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	100.00%	100.00%	100.00%
T&D | Transmission
Disaggregation of Revenue [Line Items]
Contract revenues	$ 806,367	$ 745,599	$ 772,609
T&D | Transmission | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	32.30%	33.20%	37.30%
T&D | Distribution
Disaggregation of Revenue [Line Items]
Contract revenues	$ 495,220	$ 408,779	$ 361,802
T&D | Distribution | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	19.80%	18.20%	17.50%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 1,196,702	$ 1,093,014	$ 936,748
C&I | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	100.00%	100.00%	100.00%
C&I | Electrical construction
Disaggregation of Revenue [Line Items]
Contract revenues	$ 1,196,702	$ 1,093,014	$ 936,748
C&I | Electrical construction | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	47.90%	48.60%	45.20%