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Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenues	$ 268,734	$ 246,412	$ 491,226	$ 399,828
Cost of revenues	(237,269)	(221,207)	(439,240)	(365,336)
Gross profit	31,465	25,205	51,986	34,492
General and administrative expenses	(13,622)	(12,812)	(26,649)	(23,416)
Other operating expense, net	(5,693)	(4,037)	(6,509)	(4,508)
Operating income	12,150	8,356	18,828	6,568
Interest income	201	44	330	85
Interest expense	(3,111)	(2,984)	(6,199)	(3,096)
Loss on extinguishment of debt	0	(755)	0	(755)
Income before income taxes and noncontrolling interests in earnings	9,240	4,661	12,959	2,802
Income tax expense	(98)	(98)	(138)	(125)
Net income	9,142	4,563	12,821	2,677
Noncontrolling interests in earnings	(966)	(901)	(2,158)	(1,272)
Net income attributable to Sterling common stockholders	$ 8,176	$ 3,662	$ 10,663	$ 1,405
Net income per share attributable to Sterling common stockholders:
Basic (USD per share)	$ 0.30	$ 0.14	$ 0.40	$ 0.05
Diluted (USD per share)	$ 0.30	$ 0.13	$ 0.39	$ 0.05
Weighted average number of common shares outstanding used in computing per share amounts:
Basic (in shares)	26,887	26,978	26,881	25,972
Diluted (in shares)	27,125	27,336	27,162	26,409

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