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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income (loss) attributable to Sterling common stockholders	$ 5,607	$ 8,915	$ 8,176	$ 2,489	$ 3,080	$ 7,132	$ 3,662	$ (2,257)	$ 25,187	$ 11,617	$ (9,238)
Weighted average common shares outstanding — basic (in shares)									26,903	26,274	23,140
Shares for dilutive unvested stock (in shares)									291	438	0
Weighted average common shares outstanding and assumed conversions— diluted (in shares)									27,194	26,712	23,140
Basic net income (loss) per share attributable to Sterling common stockholders (in usd per share)	$ 0.22	$ 0.33	$ 0.30	$ 0.09	$ 0.11	$ 0.27	$ 0.14	$ (0.09)	$ 0.94	$ 0.44	$ (0.40)
Diluted net income (loss) per share attributable to Sterling common stockholders (in usd per share)	$ 0.21	$ 0.33	$ 0.30	$ 0.09	$ 0.11	$ 0.26	$ 0.13	$ (0.09)	$ 0.93	$ 0.43	$ (0.40)

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