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Note 11 - Net Income (Loss) per Share Attributable to Sterling Common Stockholders (Detail) - Basic net income (loss) per share attributable to Sterling common stockholders: (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Numerator:        
Net income (loss) attributable to Sterling common stockholders (in Dollars) $ 3,287 $ 4,211 $ (4,215) $ 4,255
Revaluation of the RLW noncontrolling interest put/call liability reflected in retained earnings, net of tax (in Dollars)     (516)  
(in Dollars)     (12,076) (3,519)
Denominator:        
Weighted average common shares outstanding — basic 0.15 0.26 (0.29) 0.26
Weighted average common shares outstanding and assumed conversions— diluted 0.15 0.25 (0.29) 0.26
Basic net income (loss) per share attributable to Sterling common stockholders (in Dollars per share) $ 16,359,597 $ 16,483,691 $ 16,341,037 $ 16,474,074
Diluted net income (loss) per share attributable to Sterling common stockholders (in Dollars per share) $ 16,444,324 $ 16,594,509 $ 16,341,037 $ 16,604,368
Sterling Construction [Member]
        
Numerator:        
Net income (loss) attributable to Sterling common stockholders (in Dollars) 3,287 4,211 (4,215) 4,255
Revaluation of the RLW noncontrolling interest put/call liability reflected in retained earnings, net of tax (in Dollars) (777)   (476)  
(in Dollars) $ 2,510 $ 4,211 $ (4,691) $ 4,255
Denominator:        
Weighted average common shares outstanding — basic 16,360,000 16,484,000 16,341,000 16,474,000
Shares for dilutive stock options and warrants 84,000 111,000   130,000
Weighted average common shares outstanding and assumed conversions— diluted 16,444,000 16,595,000 16,341,000 16,604,000
Basic net income (loss) per share attributable to Sterling common stockholders (in Dollars per share) $ 150 $ 260 $ (290) $ 260
Diluted net income (loss) per share attributable to Sterling common stockholders (in Dollars per share) $ 150 $ 250 $ (290) $ 260