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Securitization of Receivables - Schedule of Fair Values of Retained Assets, Discount Rates Used in Valuing Assets (Detail)

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Securitization of Receivables - Schedule of Fair Values of Retained Assets, Discount Rates Used in Valuing Assets (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Minimum [Member]
   
Servicing Assets at Fair Value [Line Items]    
Discount rate 8.00%  
Maximum [Member]
   
Servicing Assets at Fair Value [Line Items]    
Discount rate 10.00%  
Servicing [Member]
   
Servicing Assets at Fair Value [Line Items]    
Amortized cost basis $ 1,046 $ 1,281
Fair value 1,186 1,407
Weighted-average life in years 8 years 8 years
Discount rate 8.00% 8.00%
Fair value that would be decreased based on hypothetical adverse changes in discount rates:    
5% change in discount rate 229 255
10% change in discount rate 372 418
Residual Assets [Member]
   
Servicing Assets at Fair Value [Line Items]    
Amortized cost basis 5,015 4,750
Fair value 5,012 4,863
Fair value that would be decreased based on hypothetical adverse changes in discount rates:    
5% change in discount rate 1,348 1,194
10% change in discount rate $ 2,104 $ 1,842
Residual Assets [Member] | Minimum [Member]
   
Servicing Assets at Fair Value [Line Items]    
Weighted-average life in years 7 years 6 years
Discount rate 8.00% 8.00%
Residual Assets [Member] | Maximum [Member]
   
Servicing Assets at Fair Value [Line Items]    
Weighted-average life in years 19 years 19 years
Discount rate 10.00% 10.00%