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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan $ 1,165,305 $ 2,586,792 $ 1,931,082 $ 4,297,543
Long Term Retention Plan 2009 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan (88,128) 709,758 (439,050) 1,117,678
Long Term Retention Plan 2010 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan (7,680) 624,140 (190,575) 1,017,936
Long Term Retention Plan 2011 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan 43,895 595,513 (57,217) 1,006,713
Long Term Retention Plan 2012 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan 90,931 657,381 89,984 1,155,216
Long Term Retention Plan 2013 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan 435,358   1,039,219  
Long Term Retention Plan 2014 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long term retention plan $ 690,929   $ 1,488,721