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Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues	$ 223,949	$ 222,492
Cost of revenues	(204,446)	(202,658)
Gross profit	19,503	19,834
General and administrative expenses	(12,489)	(12,340)
Other operating expense, net	(2,294)	(815)
Operating income	4,720	6,679
Interest income	364	129
Interest expense	(3,060)	(3,087)
Income before income taxes	2,024	3,721
Income tax expense	(163)	(41)
Net income	1,861	3,680
Less: Net income attributable to noncontrolling interests	(46)	(1,191)
Net income attributable to Sterling common stockholders	$ 1,815	$ 2,489
Net income per share attributable to Sterling common stockholders:
Basic (USD per share)	$ 0.07	$ 0.09
Diluted (USD per share)	$ 0.07	$ 0.09
Weighted average number of common shares outstanding used in computing per share amounts:
Basic (in shares)	26,377	26,854
Diluted (in shares)	26,723	27,078

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