Quarterly report pursuant to Section 13 or 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
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Securitization Trust [Member]
   
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]    
Purchase of receivables securitized $ 110,225 $ 38,360
Proceeds from securitizations 114,601 39,244
Servicing fees received 397 393
Cash received from residual assets $ 624 $ 371