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Net Income Per Share Attributable to Sterling Common Stockholders - Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income attributable to Sterling common stockholders	$ 8,915	$ 7,132	$ 19,580	$ 8,537
Weighted average common shares outstanding, basic (in shares)	26,908	26,486	26,893	25,787
Shares for dilutive unvested stock and warrants (in shares)	387	434	281	473
Weighted average common shares outstanding and incremental shares assumed repurchased, diluted (in shares)	27,295	26,920	27,174	26,260
Basic income per share attributable to Sterling common stockholders (USD per share)	$ 0.33	$ 0.27	$ 0.73	$ 0.33
Diluted income per share attributable to Sterling common stockholders (USD per share)	$ 0.33	$ 0.26	$ 0.72	$ 0.33

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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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