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Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 255,175	$ 291,266	$ 268,734	$ 222,492	$ 253,911	$ 304,219	$ 246,412	$ 153,416	$ 1,037,667	$ 957,958	$ 690,123
Gross profit	26,742	31,531	31,465	20,594	23,969	30,631	25,205	9,287	110,332	89,092	42,058
Income before income taxes and earnings attributable to noncontrolling interests	6,738	11,579	9,240	3,721	3,963	9,170	4,661	(1,859)	31,278	15,935	(7,324)
Net income 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)
Net income (loss) per share attributable to Sterling common stockholders:
Net income (loss) attributable to Sterling common stockholders, basic (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)
Net income (loss) attributable to Sterling common stockholders, diluted (in dollars 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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