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Segment Information - Summary of segment's internal financial reports (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Contract revenues | $ 448,776 | $ 339,676 | $ 916,870 | $ 685,287
Income from operations | 9,410 | 10,357 | 19,036 | 18,764
T&D [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Contract revenues | 255,910 | 196,925 | 528,458 | 413,311
Income from operations | 16,050 | 11,018 | 30,980 | 24,559
C&I [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Contract revenues | 192,866 | 142,751 | 388,412 | 271,976
Income from operations | 4,512 | 9,635 | 9,570 | 14,971
GeneralCorporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from operations | $ (11,152) | $ (10,296) | $ (21,514) | $ (20,766)

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