Annual report pursuant to Section 13 and 15(d)

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

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Securitization of Receivables - Schedule of Cash Flows between us and Securitization Trusts (Detail) (Securitization Trust [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Sep. 30, 2012
Sep. 30, 2011
Securitization Trust [Member]
       
Schedule Of Cash Flow Supplemental [Line Items]        
Purchase of receivables securitized $ 57,056 $ 260,115 $ 142,045 $ 116,493
Proceeds from securitizations 59,590 265,712 145,957 120,518
Servicing fees received 137 581 689 794
Cash received from residual assets $ 215 $ 479 $ 631 $ 1,401