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Segment Information - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) segment | Jun. 30, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Contract revenues | $ 448,776 | $ 339,676 | $ 916,870 | $ 685,287
Number of business segments (segment) | segment |  |  | 2 |
C&I [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Contract revenues | 192,866 | 142,751 | $ 388,412 | 271,976
C&I [Member] | CANADA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Contract revenues | $ 20,800 | $ 14,500 | $ 33,500 | $ 29,200

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