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Derivative Instruments - Additional Information (Detail) - Other Assets
$ in Millions
Sep. 30, 2015
USD ($)
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 $ 18.8