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Note 12 - 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
Mar. 31, 2013
Mar. 31, 2012
Numerator:    
Net loss attributable to Sterling common stockholders $ (4,580) $ (7,500)
Revaluation of noncontrolling interest obligations reflected in retained earnings, net of tax (1,854) 301
$ (6,434) $ (7,199)
Denominator:    
Weighted average common shares outstanding — basic (in Shares) 16,598,255 16,322,477
Weighted average common shares outstanding and assumed conversions— diluted (in Shares) 16,598,255 16,322,477
Basic loss per share attributable to Sterling common stockholders (in Dollars per share) $ (0.39) $ (0.44)
Diluted loss per share attributable to Sterling common stockholders (in Dollars per share) $ (0.39) $ (0.44)