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Offsetting of Financial Assets (Liabilities) and Derivative Assets (liabilities) (Detail) (Subject to an enforceable master netting arrangement, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Sep. 30, 2013
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized $ 17,429 $ 14,467
Gross Liabilities Offset in the Statement of Financial Position (15,208) (17,820)
Net Assets (Liabilities) Presented in the Statement of Financial Position 2,221 (3,353)
Financial Instruments      
Cash Collateral Received      
Net Amount 2,221 (3,353)
Fair liability and fair asset value of derivative instruments
    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 2,462 7,213
Gross Liabilities Offset in the Statement of Financial Position (3,499) (11,212)
Net Assets (Liabilities) Presented in the Statement of Financial Position (1,037) (3,999)
Financial Instruments      
Cash Collateral Received      
Net Amount (1,037) (3,999)
Fair asset and fair liability value of derivative instruments
    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 14,967 7,254
Gross Liabilities Offset in the Statement of Financial Position (11,709) (6,608)
Net Assets (Liabilities) Presented in the Statement of Financial Position 3,258 646
Financial Instruments      
Cash Collateral Received      
Net Amount $ 3,258 $ 646