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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenues	$ 222,492	$ 153,416
Cost of revenues	(201,898)	(144,129)
Gross profit	20,594	9,287
General and administrative expenses	(13,100)	(10,604)
Other operating expense, net	(815)	(471)
Operating income (loss)	6,679	(1,788)
Interest income	129	41
Interest expense	(3,087)	(112)
Income (loss) before income taxes and noncontrolling interests in earnings	3,721	(1,859)
Income tax benefit (expense)	(41)	(27)
Net income (loss)	3,680	(1,886)
Noncontrolling interests in earnings	(1,191)	(371)
Net income (loss) attributable to Sterling common stockholders	$ 2,489	$ (2,257)
Net income (loss) per share attributable to Sterling common stockholders:
Basic (USD per share)	$ 0.09	$ (0.09)
Diluted (USD per share)	$ 0.09	$ (0.09)
Weighted average number of common shares outstanding used in computing per share amounts:
Basic (in shares)	26,854	25,022
Diluted (in shares)	27,078	25,022

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