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Construction Joint Ventures - Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Current assets	$ 309,023	$ 302,616
Less current liabilities	(198,532)	(179,174)
Sterling’s receivables from and equity in noncontrolling construction joint ventures	14,381	10,720
Joint Ventures
Schedule of Equity Method Investments [Line Items]
Current assets	95,991	64,815
Less current liabilities	(98,192)	(74,543)
Net liabilities	(2,201)	(9,728)
Sterling’s receivables from and equity in noncontrolling construction joint ventures	$ 14,381	$ 10,720

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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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