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Net Income (Loss) 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, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income (loss) attributable to Sterling common stockholders	$ 2,489	$ (2,257)
Weighted average common shares outstanding, basic (in shares)	26,854	25,022
Shares for dilutive unvested stock and warrants (in shares)	224	0
Weighted average common shares outstanding and incremental shares assumed repurchased, diluted (in shares)	27,078	25,022
Basic income (loss) per share attributable to Sterling common stockholders (USD per share)	$ 0.09	$ (0.09)
Diluted income (loss) per share attributable to Sterling common stockholders (USD per share)	$ 0.09	$ (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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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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