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Derivative Instruments - Summary of Notional for VIE Derivatives Outstanding (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule Of Notional For Variable Interest Entity Derivatives Outstanding [Line Items]    
Derivative products, Notional Amount $ 187,121 $ 190,653
Variable Interest Entity [Member] | Interest Rate Swaps [Member]
    
Schedule Of Notional For Variable Interest Entity Derivatives Outstanding [Line Items]    
Derivative products, Notional Amount 1,771,255 1,702,113
Variable Interest Entity [Member] | Interest Rate Swaps Pay Fixed Receive Variable [Member]
    
Schedule Of Notional For Variable Interest Entity Derivatives Outstanding [Line Items]    
Derivative products, Notional Amount 4,676,450 4,535,626
Variable Interest Entity [Member] | Currency Swaps [Member]
    
Schedule Of Notional For Variable Interest Entity Derivatives Outstanding [Line Items]    
Derivative products, Notional Amount 750,463 721,168
Variable Interest Entity [Member] | Credit Derivatives [Member]
    
Schedule Of Notional For Variable Interest Entity Derivatives Outstanding [Line Items]    
Derivative products, Notional Amount $ 20,747 $ 20,934