Quarterly report pursuant to Section 13 or 15(d)

Securitization of Receivables - Schedule of Cash Flows between Company and Securitization Trusts (Detail)

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Securitization of Receivables - Schedule of Cash Flows between Company and Securitization Trusts (Detail) (Securitization Trust [Member], USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Securitization Trust [Member]
   
Schedule Of Cash Flow Supplemental [Line Items]    
Purchase of receivables securitized $ 38,359,817 $ 90,291,828
Proceeds from securitizations 39,244,317 91,922,699
Servicing fees received 392,735 417,803
Cash received from residual assets $ 370,818 $ 500,155