Annual report pursuant to Section 13 and 15(d)

Financing Receivables and Investments - Summary of Anticipated Maturity Dates of Financing Receivables and Investments (Parenthetical) (Detail)

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Financing Receivables and Investments - Summary of Anticipated Maturity Dates of Financing Receivables and Investments (Parenthetical) (Detail) (USD $)
Dec. 31, 2013
Sep. 30, 2012
Receivables [Abstract]    
Financing receivable held for sale, carrying value and fair value $ 27,971,000   
Available-for-sale debt security 3,200,000  
Financing receivables allowance for credit losses $ 11,000,000 $ 0