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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenues	$ 304,219	$ 205,629	$ 704,047	$ 521,778
Cost of revenues	(273,588)	(189,007)	(638,924)	(486,065)
Gross profit	30,631	16,622	65,123	35,713
General and administrative expenses	(13,129)	(9,146)	(36,545)	(27,888)
Other operating expense, net	(4,863)	(3,804)	(9,371)	(7,238)
Operating income	12,639	3,672	19,207	587
Interest income	107	15	192	19
Interest expense	(3,576)	(491)	(6,672)	(2,176)
Loss on extinguishment of debt	0	0	(755)	0
Income (loss) before income taxes and earnings attributable to noncontrolling interests	9,170	3,196	11,972	(1,570)
Income tax expense	(344)	(41)	(469)	(68)
Net income (loss)	8,826	3,155	11,503	(1,638)
Noncontrolling owners’ interests in earnings of subsidiaries and joint ventures	(1,694)	(740)	(2,966)	(1,252)
Net income (loss) attributable to Sterling common stockholders	$ 7,132	$ 2,415	$ 8,537	$ (2,890)
Net income (loss) per share attributable to Sterling common stockholders:
Basic (USD per share)	$ 0.27	$ 0.10	$ 0.33	$ (0.12)
Diluted (USD per share)	$ 0.26	$ 0.10	$ 0.33	$ (0.12)
Weighted average number of common shares outstanding used in computing per share amounts:
Basic (in shares)	26,486	25,003	25,787	23,915
Diluted (in shares)	26,920	25,365	26,260	23,915

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