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Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenues	$ 264,086	$ 268,734	$ 488,035	$ 491,226
Cost of revenues	(238,590)	(237,688)	(443,036)	(440,346)
Gross profit	25,496	31,046	44,999	50,880
General and administrative expense	(10,774)	(13,203)	(23,263)	(25,543)
Other operating expense, net	(3,538)	(5,694)	(5,832)	(6,509)
Operating income	11,184	12,149	15,904	18,828
Interest income	291	201	655	330
Interest expense	(2,904)	(3,112)	(5,964)	(6,199)
Income before income taxes	8,571	9,238	10,595	12,959
Income tax expense	(706)	(97)	(869)	(138)
Net income	7,865	9,141	9,726	12,821
Less: Net income attributable to noncontrolling interests	(37)	(967)	(83)	(2,158)
Net income attributable to Sterling common stockholders	$ 7,828	$ 8,174	$ 9,643	$ 10,663
Net income per share attributable to Sterling common stockholders:
Basic (in dollars per share)	$ 0.30	$ 0.30	$ 0.37	$ 0.40
Diluted (in dollars per share)	$ 0.29	$ 0.30	$ 0.36	$ 0.39
Weighted average common shares outstanding:
Basic (in shares)	26,338	26,887	26,357	26,881
Diluted (in shares)	26,623	27,125	26,657	27,162

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