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Quarterly Financial Information - Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 253,911 | $ 304,219 | $ 246,412 | $ 153,416 | $ 168,345 | $ 205,629 | $ 189,582 | $ 126,567 | $ 957,958 | $ 690,123 | $ 623,595
Gross profit | 23,969 | 30,631 | 25,205 | 9,287 | 6,345 | 16,622 | 15,543 | 3,548 | 89,092 | 42,058 | 27,651
Income before tax | 3,963 | 9,170 | 4,661 | (1,859) | (5,754) | 3,196 | 2,570 | (7,336) | 15,935 | (7,324) |
Net income attributable to Sterling common stockholders | $ 3,080 | $ 7,132 | $ 3,662 | $ (2,257) | $ (6,348) | $ 2,415 | $ 2,023 | $ (7,328) | $ 11,617 | $ (9,238) | $ (39,176)
Net income (loss) per share attributable to Sterling common stockholders: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Sterling common stockholders, basic (in dollars per share) | $ 0.11 | $ 0.27 | $ 0.14 | $ (0.09) |  |  |  |  | $ 0.44 | $ (0.40) | $ (2.02)
Net income (loss) attributable to Sterling common stockholders, diluted (in dollars per share) | $ 0.11 | $ 0.26 | $ 0.13 | $ (0.09) |  |  |  |  | $ 0.43 | (0.40) | $ (2.02)
Net income (loss) per share attributable to Sterling common stockholders, basic and diluted (USD per share) |  |  |  |  | $ (0.25) | $ 0.10 | $ 0.09 | $ (0.37) |  | $ (0.40) |

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