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Construction Joint Ventures - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 27, 2015
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Noncontrolling interests | $ 4,856 | $ 656 |
Joint Ventures |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Sterling’s noncontrolling interest in backlog | $ 55,096 | $ 52,992 |
Granite Construction Corporation |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |
Myers |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Noncontrolling interests |  |  | $ 7,400

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