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Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") Consolidated 50% Owned Subsidiaries, including Variable Interest Entities - Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Equity Method Investments [Line Items]
Operating income	$ 12,150	$ 8,356	$ 18,828	$ 6,568
Net income attributable to Sterling common stockholders	8,176	3,662	10,663	1,405
Variable Interest Entity, Primary Beneficiary
Schedule of Equity Method Investments [Line Items]
Revenues	45,795	38,783	85,970	62,067
Operating income	1,632	2,246	2,740	2,640
Net income attributable to Sterling common stockholders	$ 816	$ 1,121	$ 1,370	$ 1,316

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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