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Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") - Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]
Operating income	$ 14,372	$ 12,639	$ 33,201	$ 19,207
Net income attributable to Sterling common stockholders	8,915	7,132	19,580	8,537
Variable Interest Entity, Primary Beneficiary
Schedule of Equity Method Investments [Line Items]
Revenues	56,816	64,266	142,786	126,333
Operating income	2,488	3,666	5,227	6,307
Net income attributable to Sterling common stockholders	$ 1,245	$ 1,834	$ 2,615	$ 3,149

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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