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Derivative Instruments - Summary of Notional for VIE Derivatives Outstanding (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule Of Notional For Variable Interest Entity Derivatives Outstanding [Line Items]    
Derivative products, Notional Amount $ 203,307 $ 213,585
Interest rate swaps [Member]
    
Schedule Of Notional For Variable Interest Entity Derivatives Outstanding [Line Items]    
Derivative products, Notional Amount 1,667,651 1,782,999
Interest rate swaps-pay-fixed/receive-variable [Member]
    
Schedule Of Notional For Variable Interest Entity Derivatives Outstanding [Line Items]    
Derivative products, Notional Amount 4,372,613 4,707,454
Currency swaps [Member]
    
Schedule Of Notional For Variable Interest Entity Derivatives Outstanding [Line Items]    
Derivative products, Notional Amount 706,568 755,438
Credit derivatives [Member]
    
Schedule Of Notional For Variable Interest Entity Derivatives Outstanding [Line Items]    
Derivative products, Notional Amount $ 18,939 $ 20,885