Quarterly report pursuant to Section 13 or 15(d)

Securitization of Receivables - Summary of Certain Transactions with Securitization Trusts (Detail)

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Securitization of Receivables - Summary of Certain Transactions with Securitization Trusts (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]    
Gains on securitizations $ 18,136 $ 8,730
Securitization Trust [Member]    
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]    
Gains on securitizations 15,000 13,000
Purchase of receivables securitized 277,000 394,000
Proceeds from securitizations 292,000 407,000
Cash received from residual and servicing assets 4,000 2,000
Securitization Trust [Member] | Residual Assets [Member]    
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]    
Residual and servicing assets included in other assets $ 35,000 $ 18,000