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Construction Joint Ventures - Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Current assets	$ 289,883	$ 278,526
Less current liabilities	(175,761)	(182,292)
Sterling’s receivables from and equity in noncontrolling construction joint ventures	11,766	11,380
Joint Ventures
Schedule of Equity Method Investments [Line Items]
Current assets	62,050	64,574
Less current liabilities	(70,502)	(78,349)
Net liabilities	(8,452)	(13,775)
Sterling’s receivables from and equity in noncontrolling construction joint ventures	$ 11,766	$ 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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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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