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Asset-Backed Securities Issued - Additional Information (Detail) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Debt Instrument [Line Items]      
Description of interest rate Substantially all ABS issued pay variable rates of interest, which are indexed to one-, three-, or six-month LIBOR.    
Asset-backed Securities
      
Debt Instrument [Line Items]      
ABS issued $ 1,656,202,000   $ 1,942,962,000
Amortization of deferred ABS issuance costs 2,000,000 3,000,000  
Asset-backed Securities | Contractual maturities of over five years
      
Debt Instrument [Line Items]      
ABS issued 1,640,000,000    
Contractual maturities of ABS (in years) 5 years    
Asset-backed Securities | Maturity Less Than One Year
      
Debt Instrument [Line Items]      
ABS issued 18,000,000    
Contractual maturities of ABS, maximum (in years) 1 year    
Asset-backed Securities | Certificates With Principal Value
      
Debt Instrument [Line Items]      
Principal value 1,667,439,000   1,956,951,000
Asset-backed Securities | Certificates With Principal Value | Contractual maturities of over five years
      
Debt Instrument [Line Items]      
Principal value 1,650,000,000    
Asset-backed Securities | Certificates With Principal Value | Maturity Less Than One Year
      
Debt Instrument [Line Items]      
Principal value $ 18,000,000