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Derivative Instruments - Summary of Notional Amounts of AFS's Trading Derivative Products (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Interest rate swaps [Member]
    
Schedule Of Notional Amounts Of Parents Financial Services Trading Derivative Products [Line Items]    
Derivative products, Notional Amount $ 1,667,651 $ 1,782,999
Interest rate swaps-pay-fixed/receive-variable [Member]
    
Schedule Of Notional Amounts Of Parents Financial Services Trading Derivative Products [Line Items]    
Derivative products, Notional Amount 4,372,613 4,707,454
AFS [Member] | Interest rate swaps [Member]
    
Schedule Of Notional Amounts Of Parents Financial Services Trading Derivative Products [Line Items]    
Derivative products, Notional Amount 704,272 727,926
AFS [Member] | Interest rate swaps-pay-fixed/receive-variable [Member]
    
Schedule Of Notional Amounts Of Parents Financial Services Trading Derivative Products [Line Items]    
Derivative products, Notional Amount 1,576,832 1,657,382
AFS [Member] | Interest rate swaps-basis swaps [Member]
    
Schedule Of Notional Amounts Of Parents Financial Services Trading Derivative Products [Line Items]    
Derivative products, Notional Amount 161,690 161,690
AFS [Member] | Futures contracts [Member]
    
Schedule Of Notional Amounts Of Parents Financial Services Trading Derivative Products [Line Items]    
Derivative products, Notional Amount 161,500 161,500
AFS [Member] | Other contracts [Member]
    
Schedule Of Notional Amounts Of Parents Financial Services Trading Derivative Products [Line Items]    
Derivative products, Notional Amount $ 75,651 $ 75,651