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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
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net income attributable to Sterling common stockholders	$ 1,815	$ 2,489
Weighted average common shares outstanding, basic (in shares)	26,377	26,854
Shares for dilutive unvested stock and warrants (in shares)	346	224
Weighted average common shares outstanding and incremental shares assumed repurchased, diluted (in shares)	26,723	27,078
Basic income per share attributable to Sterling common stockholders (USD per share)	$ 0.07	$ 0.09
Diluted income per share attributable to Sterling common stockholders (USD per share)	$ 0.07	$ 0.09

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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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