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Quarterly Financial Information - Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 253,911	$ 304,219	$ 246,412	$ 153,416	$ 168,345	$ 205,629	$ 189,582	$ 126,567	$ 957,958	$ 690,123	$ 623,595
Gross profit	23,969	30,631	25,205	9,287	6,345	16,622	15,543	3,548	89,092	42,058	27,651
Income before tax	3,963	9,170	4,661	(1,859)	(5,754)	3,196	2,570	(7,336)	15,935	(7,324)
Net income attributable to Sterling common stockholders	$ 3,080	$ 7,132	$ 3,662	$ (2,257)	$ (6,348)	$ 2,415	$ 2,023	$ (7,328)	$ 11,617	$ (9,238)	$ (39,176)
Net income (loss) per share attributable to Sterling common stockholders:
Net income (loss) attributable to Sterling common stockholders, basic (in dollars per share)	$ 0.11	$ 0.27	$ 0.14	$ (0.09)					$ 0.44	$ (0.40)	$ (2.02)
Net income (loss) attributable to Sterling common stockholders, diluted (in dollars per share)	$ 0.11	$ 0.26	$ 0.13	$ (0.09)					$ 0.43	(0.40)	$ (2.02)
Net income (loss) per share attributable to Sterling common stockholders, basic and diluted (USD per share)					$ (0.25)	$ 0.10	$ 0.09	$ (0.37)		$ (0.40)

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