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Construction Joint Ventures - Income Statement Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Sterling’s noncontrolling interest: |  |  |  |
Revenues |  |  | $ 3,409 | $ 2,966
Joint Ventures |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Revenues | $ 29,557 | $ 27,703 | 89,010 | 61,210
Income before tax | 1,728 | (6,281) | 7,324 | (3,611)
Sterling’s noncontrolling interest: |  |  |  |
Revenues | 12,820 | 13,664 | 41,739 | 28,826
Income before tax | $ 858 | $ (1,629) | $ 3,716 | $ (358)

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