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Long Term Retention Plan - Long Term Retention Plans Accrued Compensation Expense (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Long Term Retention Plan 2009 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan $ 709,758 $ (497,895) $ 1,117,678 $ 179,924
Long Term Retention Plan 2010 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan 624,140 (51,239) 1,017,936 532,918
Long Term Retention Plan 2011 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan 595,513 119,814 1,006,713 686,876
Long Term Retention Plan 2012 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan $ 657,381 $ 359,637 $ 1,155,216 $ 792,088