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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Revenues $ 1,427,412 $ 1,126,278 $ 1,037,667
Cost of revenues (1,236,043) (1,018,484) (927,335)
Gross profit 191,369 107,794 110,332
General and administrative expense (71,415) (49,200) (48,220)
Intangible asset amortization (11,436) (4,695) (2,400)
Acquisition related costs (1,026) (4,311) 0
Other operating expense, net (12,600) (11,837) (17,101)
Operating income 94,892 37,751 42,611
Interest income 161 1,142 1,017
Interest expense (29,377) (16,686) (12,350)
Loss on extinguishment of debt (301) (7,728) 0
Income before income taxes 65,375 14,479 31,278
Income tax (expense) benefit (22,471) 26,216 (1,738)
Net income 42,904 40,695 29,540
Less: Net income attributable to noncontrolling interests (598) (794) (4,353)
Net income attributable to Sterling common stockholders $ 42,306 $ 39,901 $ 25,187
Net income per share attributable to Sterling common stockholders:      
Basic (in dollars per share) $ 1.52 $ 1.50 $ 0.94
Diluted (in dollars per share) $ 1.50 $ 1.47 $ 0.93
Weighted average common shares outstanding:      
Basic (in shares) 27,859 26,671 26,903
Diluted (in shares) 28,195 27,119 27,194