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Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenues	$ 291,266	$ 304,219	$ 782,492	$ 704,047
Cost of revenues	(259,735)	(273,588)	(698,975)	(638,924)
Gross profit	31,531	30,631	83,517	65,123
General and administrative expenses	(11,707)	(13,129)	(38,356)	(36,545)
Other operating expense, net	(5,452)	(4,863)	(11,960)	(9,371)
Operating income	14,372	12,639	33,201	19,207
Interest income	274	107	604	192
Interest expense	(3,067)	(3,576)	(9,265)	(6,672)
Loss on extinguishment of debt	0	0	0	(755)
Income before income taxes and noncontrolling interests in earnings	11,579	9,170	24,540	11,972
Current income tax expense	(1,413)	(344)	(1,551)	(469)
Net income	10,166	8,826	22,989	11,503
Noncontrolling interests in earnings	(1,251)	(1,694)	(3,409)	(2,966)
Net income attributable to Sterling common stockholders	$ 8,915	$ 7,132	$ 19,580	$ 8,537
Net income per share attributable to Sterling common stockholders:
Basic (USD per share)	$ 0.33	$ 0.27	$ 0.73	$ 0.33
Diluted (USD per share)	$ 0.33	$ 0.26	$ 0.72	$ 0.33
Weighted average number of common shares outstanding used in computing per share amounts:
Basic (in shares)	26,908	26,486	26,893	25,787
Diluted (in shares)	27,295	26,920	27,174	26,260

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