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Derivative Instruments - Summary of Location and Amount of Gains and Losses of Derivative Contracts (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Derivative, gain (loss) on derivative, net, Total $ (83,626) $ 183,923
Variable interest entity [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Derivative, gain (loss) on derivative, net, Total (95,844) 82,508
Financial Services derivatives products [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Derivative, gain (loss) on derivative, net, Total (569) 46,957
Credit derivatives [Member] | Financial guarantee [Member] | Net change in fair value of credit derivatives [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Derivative instruments, gain (loss) recognized in income, net, Total 12,787 (7,222)
Interest rate swaps [Member] | Income on variable interest entities [Member] | Variable interest entity [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Derivative instruments, gain (loss) recognized in income, net, Total (100,548) 93,715
Interest rate swaps [Member] | Financial Services derivatives products [Member] | Derivative products [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Derivative instruments, gain (loss) recognized in income, net, Total (1,022) 42,185
Currency swaps [Member] | Income on variable interest entities [Member] | Variable interest entity [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Derivative instruments, gain (loss) recognized in income, net, Total 4,704 (11,207)
Currency swaps [Member] | Financial Services derivatives products [Member] | Derivative products [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Derivative instruments, gain (loss) recognized in income, net, Total 0 156
Futures contracts [Member] | Financial Services derivatives products [Member] | Derivative products [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Derivative instruments, gain (loss) recognized in income, net, Total 455 4,308
Other contracts [Member] | Financial Services derivatives products [Member] | Derivative products [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Derivative instruments, gain (loss) recognized in income, net, Total (2) 308
Third call option [Member] | Other income [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Derivative instruments, gain (loss) recognized in income, net, Total   $ 61,680