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Fair Value of Financial Instruments - Assets and Liabilities Carrying at Fair Value on Recurring Basis (Parenthetical) (Detail) (Carrying Amount [Member], Recurring [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2011
Carrying Amount [Member] | Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest receivable $ 5 $ 9