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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Revenues $ 957,958 $ 690,123 $ 623,595
Cost of revenues (868,866) (648,065) (595,944)
Gross profit 89,092 42,058 27,651
General and administrative expenses (48,351) (36,844) (40,466)
Other operating expense, net (14,565) (9,943) (1,572)
Operating income (loss) 26,176 (4,729) (14,387)
Interest income 314 33 460
Interest expense (9,800) (2,628) (3,012)
Loss on extinguishment of debt (755) 0 (240)
Income (loss) before income taxes and earnings attributable to noncontrolling interests 15,935 (7,324) (17,179)
Income tax expense (118) (88) (7)
Net income (loss) 15,817 (7,412) (35,960)
Net income (loss), including portion attributable to noncontrolling interest, revaluation of noncontrolling interest due to a new agreement     (17,186)
Noncontrolling owners’ interests in earnings of subsidiaries and joint ventures (4,200) (1,826) (3,216)
Net income (loss) attributable to Sterling common stockholders before noncontrolling interest revaluation 11,617 (9,238) (20,402)
Revaluation of a noncontrolling interest due to a new agreement 0 0 (18,774)
Net income (loss) attributable to Sterling common stockholders $ 11,617 $ (9,238) $ (39,176)
Net income (loss) per share attributable to Sterling common stockholders:      
Net income (loss) attributable to Sterling common stockholders, basic (in dollars per share) $ 0.44 $ (0.40) $ (2.02)
Net income (loss) attributable to Sterling common stockholders, diluted (in dollars per share) $ 0.43 $ (0.40) $ (2.02)
Weighted average number of common shares outstanding used in computing per share amounts:      
Weighted average common shares outstanding, basic (in shares) 26,274 23,140 19,375
Weighted average number of shares outstanding, diluted (in shares) 26,712 23,140 19,375