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Long Term Retention Plan - Long Term Retention Plans Accrued Compensation Expense (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Long term retention plan $ 765,775 $ 1,710,752
Long Term Retention Plan 2009 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Long term retention plan (350,923) 407,920
Long Term Retention Plan 2010 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Long term retention plan (182,895) 393,796
Long Term Retention Plan 2011 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Long term retention plan (101,112) 411,200
Long Term Retention Plan 2012 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Long term retention plan (947) 497,836
Long Term Retention Plan 2013 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Long term retention plan 603,861   
Long Term Retention Plan 2014 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Long term retention plan $ 797,791