Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Residual Interests Securitized Receivables and Derivatives Carried at Fair Value (Detail)

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Fair Value Measurements - Schedule of Residual Interests Securitized Receivables and Derivatives Carried at Fair Value (Detail) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value $ 5,617,000 $ 6,144,000
Level 3 [Member] | Financing Receivable [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 401,700,000 346,400,000
Carrying Value 395,500,000 347,900,000
Level 3 [Member] | Investments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 92,500,000 92,000,000
Carrying Value 91,300,000 92,000,000
Level 3 [Member] | Financing Receivables and Investments Held-for-Sale [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   28,000,000
Carrying Value   28,000,000
Level 3 [Member] | Residual Assets [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 4,500,000 4,900,000
Carrying Value 4,500,000 4,900,000
Level 3 [Member] | Credit Facility [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 117,100,000 77,100,000
Carrying Value 117,100,000 77,100,000
Level 3 [Member] | Nonrecourse Debt [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 157,700,000 167,100,000
Carrying Value 150,700,000 159,800,000
Level 3 [Member] | Asset-Backed Nonrecourse Notes [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 98,200,000 99,800,000
Carrying Value $ 98,700,000 $ 100,000,000