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Segment Information - Summary of segment's internal financial reports (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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract revenues | $ 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
Income from operations |  |  |  |  |  |  |  |  | 57,178 | 50,312 | 29,558
T&D [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract revenues |  |  |  |  |  |  |  |  | 1,134,411 | 893,108 | 879,372
Income from operations |  |  |  |  |  |  |  |  | 73,580 | 57,242 | 39,631
C&I [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract revenues |  |  |  |  |  |  |  |  | 936,748 | 638,061 | 523,945
Income from operations |  |  |  |  |  |  |  |  | 30,506 | 34,112 | 25,048
General Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | $ (46,908) | $ (41,042) | $ (35,121)

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