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Derivative Instruments - Additional Information (Detail) (Other Assets, USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Collateral posted for derivatives $ 4.8
Interest Rate Swap
 
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Margin calls made in connection with interest rate swaps $ 10.0