Quarterly report pursuant to Section 13 or 15(d)

Securitization of Receivables - Additional Information (Detail)

v2.4.0.8
Securitization of Receivables - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Gain on securitization of receivables $ 2,200,000 $ 1,900,000 $ 6,500,000 $ 2,800,000  
Change in discount rate 5.00%   5.00%   10.00%
Managed receivables 2,300,000,000   2,300,000,000   2,100,000,000
Securitization credit losses 0 0      
Asset-backed Securities, Securitized Loans and Receivables [Member]
          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Managed receivables $ 1,700,000,000   $ 1,700,000,000   $ 1,600,000,000
Minimum [Member]
          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Annual servicing fees     0.05%    
Maximum [Member]
          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Annual servicing fees     0.20%