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Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") - Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | $ 42,611 | $ 26,176 | $ (4,729)
Net income attributable to Sterling common stockholders | $ 5,607 | $ 8,915 | $ 8,176 | $ 2,489 | $ 3,080 | $ 7,132 | $ 3,662 | $ (2,257) | 25,187 | 11,617 | (9,238)
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 193,677 | 181,589 | 156,202
Operating income |  |  |  |  |  |  |  |  | 8,819 | 9,069 | 6,005
Net income attributable to Sterling common stockholders |  |  |  |  |  |  |  |  | $ 4,415 | $ 4,531 | $ 2,993

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