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Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") Consolidated 50% Owned Subsidiaries, including Variable Interest Entities - Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |
Revenues | $ 222,492 | $ 153,416
Operating income | 6,679 | (1,788)
Net income (loss) attributable to Sterling common stockholders | 2,489 | (2,257)
Variable Interest Entity, Primary Beneficiary |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenues | 40,175 | 23,285
Operating income | 1,107 | 394
Net income (loss) attributable to Sterling common stockholders | $ 554 | $ 195

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