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Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 346,544	$ 291,699	$ 264,086	$ 223,949	$ 255,175	$ 291,266	$ 268,734	$ 222,492	$ 1,126,278	$ 1,037,667	$ 957,958
Gross profit	33,579	29,216	25,496	19,503	28,173	31,279	31,046	19,834	107,794	110,332	89,092
Income (loss) before income taxes	(5,538)	9,422	8,571	2,024	6,738	11,581	9,238	3,721	14,479	31,278	15,935
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
Net income (loss) per share attributable to Sterling common stockholders:
Net income (loss) attributable to Sterling common stockholders, basic (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
Net income (loss) attributable to Sterling common stockholders, diluted (in dollars 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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