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Fair Value Measurements - Summary of Information about Described Model Inputs Used to Determine Fair Value of Each Class of Credit Derivatives (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule Of Information About Described Model Inputs Used To Determine Fair Value Of Each Class Of Credit Derivative [Line Items]    
Notional outstanding $ 10,204,738 $ 11,281,777
Weighted average life (WAL) in years 7 years 6 months  
Weighted average quotes 9.00%  
CVA percentage 50.00%  
Weighted average credit rating A  
Fair value of derivative liabilities (57,557)  
Other Contracts [Member]
    
Schedule Of Information About Described Model Inputs Used To Determine Fair Value Of Each Class Of Credit Derivative [Line Items]    
Notional outstanding   1,424,623
Weighted average life (WAL) in years   7 years 10 months 24 days
Weighted average quotes   10.00%
CVA percentage   55.00%
Weighted average credit rating   A
Fair value of derivative liabilities   $ (62,854)