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Stock-Based Compensation (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) $ 0.58 $ 0.48
Employee Stock Ownership Plan (ESOP), Number of Suspense Shares 253,123  
Share-based Compensation (in Dollars) $ 420,522 $ 532,908
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars) 2,400,000  
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition In Years 2 years 109 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value (in Dollars) 1,200,000 1,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars) 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 409,500 1,953,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 338,018 199,998
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (513,984) (883,256)
Performance Incentive Plan 2007 [Member]
   
Share-based Compensation (in Dollars) $ 814,000 $ 533,000