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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 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Numerator:        
Net income (loss) attributable to Sterling common stockholders (in Dollars) $ 990 $ 3,461 $ (3,223) $ 7,716
Revaluation of the RLW noncontrolling interest put/call liability reflected in retained earnings, net of tax (in Dollars)     (1,279)  
(in Dollars) 4,069 5,941 11,932 13,715
Denominator:        
Weighted average common shares outstanding — basic 0.01 0.21 (0.27) 0.47
Weighted average common shares outstanding and assumed conversions— diluted 0.01 0.21 (0.27) 0.47
Basic net income (loss) per share attributable to Sterling common stockholders (in Dollars per share) $ 16,404,749.00 $ 16,385,729.00 $ 16,362,429.00 $ 16,444,302.00
Diluted net income (loss) per share attributable to Sterling common stockholders (in Dollars per share) $ 16,504,033.00 $ 16,440,835.00 $ 16,362,429.00 $ 16,558,074.00
Sterling Construction [Member]
        
Numerator:        
Net income (loss) attributable to Sterling common stockholders (in Dollars) 990 3,461 (3,223) 7,716
Revaluation of the RLW noncontrolling interest put/call liability reflected in retained earnings, net of tax (in Dollars) (762)   (1,239)  
(in Dollars) $ 228 $ 3,461 $ (4,462) $ 7,716
Denominator:        
Weighted average common shares outstanding — basic 16,405,000 16,386,000 16,362,000 16,444,000
Shares for dilutive stock options and warrants 99,000 55,000   114,000
Weighted average common shares outstanding and assumed conversions— diluted 16,504,000 16,441,000 16,362,000 16,558,000
Basic net income (loss) per share attributable to Sterling common stockholders (in Dollars per share) $ 0.01 $ 0.21 $ (0.27) $ 0.47
Diluted net income (loss) per share attributable to Sterling common stockholders (in Dollars per share) $ 0.01 $ 0.21 $ (0.27) $ 0.47