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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 (Detail) (USD $)
In Thousands, except Per Share data, 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 credit rating A  
CVA percentage 50.00%  
Fair value of derivative liabilities (57,557)  
CLO [Member]
    
Schedule Of Information About Described Model Inputs Used To Determine Fair Value Of Each Class Of Credit Derivative [Line Items]    
Notional outstanding 5,702,366 6,155,767
Weighted average reference obligation price $ 97.4 $ 96.5
Weighted average life (WAL) in years 2 years 1 month 6 days 2 years 2 months 12 days
Weighted average credit rating AA- AA-
Weighted average relative change ratio 34.50% 34.40%
CVA percentage 41.40% 55.00%
Fair value of derivative liabilities (30,736) (34,645)
Other [Member]
    
Schedule Of Information About Described Model Inputs Used To Determine Fair Value Of Each Class Of Credit Derivative [Line Items]    
Notional outstanding 3,238,742 3,701,387
Weighted average reference obligation price $ 86.9 $ 86.9
Weighted average life (WAL) in years 4 years 6 months 4 years 2 months 12 days
Weighted average credit rating A A
Weighted average relative change ratio 37.80% 38.20%
CVA percentage 49.40% 55.00%
Fair value of derivative liabilities $ (115,014) $ (116,086)