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Product Providers or Underlying Corporate Borrowers which Accounted for Ten Percent or more of Total Revenues (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Concentration Risk [Line Items]      
Revenue from major customer $ 65,780,848 $ 63,636,367 $ 30,996,179
Customer A
     
Concentration Risk [Line Items]      
Revenue from major customer     $ 6,485,735