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Construction Joint Ventures - Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Current assets	$ 313,376	$ 278,526
Less current liabilities	(194,669)	(182,292)
Sterling’s receivables from and equity in noncontrolling construction joint ventures	11,521	11,380
Joint Ventures
Schedule of Equity Method Investments [Line Items]
Current assets	64,957	64,574
Less current liabilities	(72,617)	(78,349)
Net liabilities	(7,660)	(13,775)
Sterling’s receivables from and equity in noncontrolling construction joint ventures	$ 11,521	$ 11,380

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Amounts due from minority-owned entities in which the reporting entity shares joint control with another party or group, due within 1 year (or 1 business cycle). Also, includes the entity's equity in minority-owned joint ventures.

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