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Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests - Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 253,911 | $ 304,219 | $ 246,412 | $ 153,416 | $ 168,345 | $ 205,629 | $ 189,582 | $ 126,567 | $ 957,958 | $ 690,123 | $ 623,595
Operating income |  |  |  |  |  |  |  |  | 26,176 | (4,729) | (14,387)
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)
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 181,589 | 156,202 | 175,691
Operating income |  |  |  |  |  |  |  |  | 9,069 | 6,005 | 7,371
Net income attributable to Sterling common stockholders |  |  |  |  |  |  |  |  | $ 4,531 | $ 2,993 | $ 3,681

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