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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Revenues $ 1,037,667 $ 957,958 $ 690,123
Cost of revenues (927,335) (868,866) (648,065)
Gross profit 110,332 89,092 42,058
General and administrative expenses (50,620) (48,351) (36,844)
Other operating expense, net (17,101) (14,565) (9,943)
Operating income (loss) 42,611 26,176 (4,729)
Interest income 1,017 314 33
Interest expense (12,350) (9,800) (2,628)
Loss on extinguishment of debt 0 (755) 0
Income (loss) before income taxes and noncontrolling interests in earnings 31,278 15,935 (7,324)
Income tax expense (1,738) (118) (88)
Net income (loss) 29,540 15,817 (7,412)
Noncontrolling interests in earnings (4,353) (4,200) (1,826)
Net income (loss) attributable to Sterling common stockholders $ 25,187 $ 11,617 $ (9,238)
Net income (loss) per share attributable to Sterling common stockholders:      
Basic (in dollars per share) $ 0.94 $ 0.44 $ (0.40)
Diluted (in dollars per share) $ 0.93 $ 0.43 $ (0.40)
Weighted average number of common shares outstanding used in computing per share amounts:      
Basic (in shares) 26,903 26,274 23,140
Diluted (in shares) 27,194 26,712 23,140