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Net Income (Loss) Per Share Attributable to Sterling Common Stockholders - Earnings Per Share Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Earnings Per Share [Abstract]
Net income (loss) attributable to Sterling common stockholders before noncontrolling interest revaluation									$ 11,617	$ (9,238)	$ (20,402)
Revaluation of a noncontrolling interest due to a new agreement									0	0	(18,774)
Net income (loss) 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)
Weighted average common shares outstanding — basic (in shares)									26,274	23,140	19,375
Shares for dilutive unvested stock (in shares)									438	0	0
Shares for dilutive unvested stock (in shares)									26,712	23,140	19,375
Net income (loss) attributable to Sterling common stockholders, basic (in dollars per share)	$ 0.11	$ 0.27	$ 0.14	$ (0.09)					$ 0.44	$ (0.40)	$ (2.02)
Diluted net income (loss) per share attributable to Sterling common stockholders (in shares)	$ 0.11	$ 0.26	$ 0.13	$ (0.09)					$ 0.43	$ (0.40)	$ (2.02)

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Represents the revaluation of non-controlling interest obligations reflected in retained earnings, net of tax.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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