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Outstanding Stock Option on Result of Operation (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Compensation Related Costs Share Based Payments Disclosure [Line Items]        
Stock-based compensation expense: - - Stock Options $ 32,782 $ 85,070 $ 139,451 $ 223,899
Income tax benefit 5,721 5,854 28,690 27,086
Stock options
       
Compensation Related Costs Share Based Payments Disclosure [Line Items]        
Stock-based compensation expense: - - Stock Options 32,782 85,070 139,451 223,899
Income tax benefit            
Net Decrease in Net Income $ 32,782 $ 85,070 $ 139,451 $ 223,899
Basic and Diluted $ 0.0002 $ 0.0003 $ 0.0004 $ 0.0008