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Revenue Recognition - Schedule of revenue by market type (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount | $ 571,075 | $ 583,214 | $ 448,776 | $ 468,094 | $ 446,345 | $ 399,537 | $ 339,676 | $ 345,611 | $ 2,071,159 | $ 1,531,169 | $ 1,403,317
Concentration risk |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
Revenue from Contract with Customer [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 2,071,159 | $ 1,531,169 |
Concentration risk |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
T&D [Member] | Revenue from Contract with Customer [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 1,134,411 | $ 893,108 |
Concentration risk |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
T&D [Member] | Market Type Transmission [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 772,609 | $ 559,467 |
Concentration risk |  |  |  |  |  |  |  |  | 37.30% | 36.50% |
T&D [Member] | Market Type Distribution [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 361,802 | $ 333,641 |
Concentration risk |  |  |  |  |  |  |  |  | 17.50% | 21.80% |
C&I [Member] | Revenue from Contract with Customer [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 936,748 | $ 638,061 |
Concentration risk |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
C&I [Member] | Market Type Electrical construction [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 936,748 | $ 638,061 |
Concentration risk |  |  |  |  |  |  |  |  | 45.20% | 41.70% |

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