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Construction Joint Ventures - Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Current assets	$ 257,179	$ 278,526
Less current liabilities	(158,462)	(182,292)
Sterling’s receivables from and equity in construction joint ventures	12,485	11,380
Joint Ventures
Schedule of Equity Method Investments [Line Items]
Current assets	67,990	64,574
Less current liabilities	(76,651)	(78,349)
Net liabilities	(8,661)	(13,775)
Sterling’s receivables from and equity in construction joint ventures	$ 12,485	$ 11,380

X

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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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