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Segment Information - Revenue, Operating Income, and Assets, By Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenue | $ 291,266 | $ 304,219 | $ 782,492 | $ 704,047 |
Operating income | 14,372 | 12,639 | 33,201 | 19,207 |
Assets | 494,164 |  | 494,164 |  | $ 463,298
Heavy Civil Construction |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenue | 254,544 | 263,278 | 665,068 | 625,887 |
Operating income | 9,191 | 6,960 | 17,488 | 8,627 |
Assets | 363,058 |  | 363,058 |  | 354,090
Residential Construction |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenue | 36,722 | 40,941 | 117,424 | 78,160 |
Operating income | 5,181 | $ 5,679 | 15,713 | $ 10,580 |
Assets | $ 131,106 |  | $ 131,106 |  | $ 109,208

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