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Construction Joint Ventures - Construction Joint Ventures, Partner Share (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Current assets | $ 278,526 | $ 175,908
Less current liabilities | (182,292) | (146,592)
Receivables from and equity in construction joint ventures | 11,380 | 7,130
Joint Ventures |  |
Schedule of Equity Method Investments [Line Items] |  |
Current assets | 64,574 | 32,592
Less current liabilities | (78,349) | (57,598)
Net liabilities | (13,775) | (25,006)
Backlog | 112,512 | 107,333
Sterling’s noncontrolling interest in backlog | 55,096 | 52,992
Receivables from and equity in construction joint ventures | $ 11,380 | $ 7,130

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