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Fair Value Measurements - Schedule of Residual Interests Securitized Receivables and Derivatives Carried at Fair Value (Detail) (USD $)
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Dec. 31, 2013
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Sep. 30, 2012
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| Schedule Of Dividends Declared And Paid [Line Items] | ||
| Carrying Value | $ 6,144,000 | $ 6,233,000 |
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Level 3 [Member] | Financing Receivables [Member]
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| Schedule Of Dividends Declared And Paid [Line Items] | ||
| Fair Value | 346,400,000 | 213,100,000 |
| Carrying Value | 347,900,000 | 195,600,000 |
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Level 3 [Member] | Investments [Member]
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| Schedule Of Dividends Declared And Paid [Line Items] | ||
| Fair Value | 92,000,000 | |
| Carrying Value | 92,000,000 | |
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Level 3 [Member] | Financing Receivables and Investments Held-for-Sale [Member]
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| Schedule Of Dividends Declared And Paid [Line Items] | ||
| Fair Value | 28,000,000 | |
| Carrying Value | 28,000,000 | |
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Level 3 [Member] | Residual Assets [Member]
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| Schedule Of Dividends Declared And Paid [Line Items] | ||
| Fair Value | 4,900,000 | 4,600,000 |
| Carrying Value | 4,900,000 | 4,600,000 |
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Level 3 [Member] | Credit Facility [Member]
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| Schedule Of Dividends Declared And Paid [Line Items] | ||
| Fair Value | 77,100,000 | 4,600,000 |
| Carrying Value | 77,100,000 | 4,600,000 |
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Level 3 [Member] | Nonrecourse Debt [Member]
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| Schedule Of Dividends Declared And Paid [Line Items] | ||
| Fair Value | 167,100,000 | 218,200,000 |
| Carrying Value | 159,800,000 | 200,300,000 |
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Level 3 [Member] | Asset-Backed Nonrecourse Notes [Member]
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| Schedule Of Dividends Declared And Paid [Line Items] | ||
| Fair Value | 99,800,000 | |
| Carrying Value | $ 100,000,000 |