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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
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Information About Described Model Inputs Used To Determine Fair Value Of Each Class Of Credit Derivative [Line Items]    
Notional outstanding $ 11,281,777 $ 14,166,612
Weighted average life (WAL) in years 7 years 10 months 24 days  
Weighted average quotes 10.00%  
CVA percentage 55.00% 75.00%
Weighted average credit rating A  
Fair value of derivative liabilities (62,854)  
Other Contract [Member]
    
Schedule Of Information About Described Model Inputs Used To Determine Fair Value Of Each Class Of Credit Derivative [Line Items]    
Notional outstanding   1,838,269
Weighted average life (WAL) in years   9 years
Weighted average quotes   11.00%
CVA percentage   75.00%
Weighted average credit rating   A+
Fair value of derivative liabilities   $ (49,807)