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Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests - Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Revenues	$ 253,911	$ 304,219	$ 246,412	$ 153,416	$ 168,345	$ 205,629	$ 189,582	$ 126,567	$ 957,958	$ 690,123	$ 623,595
Operating income									26,176	(4,729)	(14,387)
Net income attributable to Sterling common stockholders	$ 3,080	$ 7,132	$ 3,662	$ (2,257)	$ (6,348)	$ 2,415	$ 2,023	$ (7,328)	11,617	(9,238)	(39,176)
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Revenues									181,589	156,202	175,691
Operating income									9,069	6,005	7,371
Net income attributable to Sterling common stockholders									$ 4,531	$ 2,993	$ 3,681

X

- 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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+ 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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