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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Assets, Derivative Assets $ 178,447 $ 199,370
Gross Amounts of Recognized Liabilities, Derivative Liabilities 571,382 604,579
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets 65,636 73,264
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities 65,636 73,264
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets 112,811 126,106
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 505,746 531,315
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets      
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities 148,836 180,113
Net Amount, Derivative Assets 112,811 126,106
Net Amount, Derivative Liabilities 356,910 351,202
Variable Interest Entities [Member]
    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Liabilities, Derivative Liabilities 2,317,625 2,221,781
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities      
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 2,317,625 2,221,781
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities      
Net Amount, Derivative Liabilities 2,317,625 2,221,781
Interest rate swaps [Member]
    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Assets, Derivative Assets 178,447 198,117
Gross Amounts of Recognized Liabilities, Derivative Liabilities 366,949 390,774
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets 65,636 73,264
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities 65,636 73,264
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets 112,811 124,853
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 301,313 317,510
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets      
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities 147,925 180,113
Net Amount, Derivative Assets 112,811 124,853
Net Amount, Derivative Liabilities 153,388 137,397
Interest rate swaps [Member] | Variable Interest Entities [Member]
    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Liabilities, Derivative Liabilities 2,231,863 2,131,315
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities      
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 2,231,863 2,131,315
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities      
Net Amount, Derivative Liabilities 2,231,863 2,131,315
Futures contracts [Member]
    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Assets, Derivative Assets   1,253
Gross Amounts of Recognized Liabilities, Derivative Liabilities 911 0
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets      
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities      
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets    1,253
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 911 0
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets      
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities 911  
Net Amount, Derivative Assets   1,253
Net Amount, Derivative Liabilities   0
Credit derivatives [Member]
    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Liabilities, Derivative Liabilities 203,307 213,585
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities      
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 203,307 213,585
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities      
Net Amount, Derivative Liabilities 203,307 213,585
Other Contracts [Member]
    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Liabilities, Derivative Liabilities 215 220
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities      
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 215 220
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities      
Net Amount, Derivative Liabilities 215 220
Currency swaps [Member] | Variable Interest Entities [Member]
    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Liabilities, Derivative Liabilities 85,762 90,466
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities      
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 85,762 90,466
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities      
Net Amount, Derivative Liabilities $ 85,762 $ 90,466