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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income attributable to Sterling common stockholders	$ 22,301	$ 7,957	$ 7,828	$ 1,815	$ 5,607	$ 8,917	$ 8,174	$ 2,489	$ 39,901	$ 25,187	$ 11,617
Weighted average common shares outstanding — basic (in shares)									26,671	26,903	26,274
Shares for dilutive unvested stock (in shares)									448	291	438
Weighted average common shares outstanding and assumed conversions— diluted (in shares)									27,119	27,194	26,712
Basic net income (loss) per share attributable to Sterling common stockholders (in usd per share)	$ 0.81	$ 0.30	$ 0.30	$ 0.07	$ 0.22	$ 0.33	$ 0.30	$ 0.09	$ 1.50	$ 0.94	$ 0.44
Diluted net income (loss) per share attributable to Sterling common stockholders (in usd per share)	$ 0.79	$ 0.30	$ 0.29	$ 0.07	$ 0.21	$ 0.33	$ 0.30	$ 0.09	$ 1.47	$ 0.93	$ 0.43

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