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Summary of Fair Value Information about Derivative Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Derivative assets $ 380,995 $ 705,769
Derivative liabilities 1,278,661 1,197,346
Interest Rate Swaps
   
Derivatives, Fair Value [Line Items]    
Derivative assets 340,890 559,044
Derivative liabilities 1,272,616 1,141,828
Other Derivative Contracts | Interest Rate Swaption
   
Derivatives, Fair Value [Line Items]    
Derivative assets 36,965 110,361
Derivative liabilities   24,662
Other Derivative Contracts | TBA Derivatives
   
Derivatives, Fair Value [Line Items]    
Derivative assets 3,140 20,693
Derivative liabilities 6,045 13,779
Other Derivative Contracts | Collateralized Mortgage Backed Securities
   
Derivatives, Fair Value [Line Items]    
Derivative assets   12,184
Derivative liabilities   16,638
Other Derivative Contracts | Us Treasury futures
   
Derivatives, Fair Value [Line Items]    
Derivative assets   3,487
Derivative liabilities   $ 439