XML 37 R61.htm IDEA: XBRL DOCUMENT v2.4.0.6
Fair Value Measurements - Summary of Information about Described Model Inputs Used to Determine Fair Value of Each Class of Credit Derivative (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 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 $ 12,274,885 $ 14,166,612
Weighted average life (WAL) in years 8 years 1 month 6 days  
Weighted average quotes 10.00%  
CVA percentage 65.00% 75.00%
Weighted average credit rating A  
Fair value of derivative liabilities (52,535)  
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)