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Revenue Recognition - Schedule of revenue by market type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Amount	$ 513,051	$ 448,776	$ 1,031,521	$ 916,870
Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Amount	$ 513,051	$ 448,776	$ 1,031,521	$ 916,870
Concentration risk	100.00%	100.00%	100.00%	100.00%
T&D [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Amount	$ 276,759	$ 255,910	$ 536,029	$ 528,458
Concentration risk	100.00%	100.00%	100.00%	100.00%
T&D [Member] | Market Type Transmission [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Amount	$ 181,189	$ 169,466	$ 352,755	$ 357,231
Concentration risk	35.30%	37.80%	34.20%	39.00%
T&D [Member] | Market Type Distribution [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Amount	$ 95,570	$ 86,444	$ 183,274	$ 171,227
Concentration risk	18.60%	19.20%	17.80%	18.60%
C&I [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Amount	$ 236,292	$ 192,866	$ 495,492	$ 388,412
Concentration risk	100.00%	100.00%	100.00%	100.00%
C&I [Member] | Market Type Electrical construction [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Amount	$ 236,292	$ 192,866	$ 495,492	$ 388,412
Concentration risk	46.10%	43.00%	48.00%	42.40%

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