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Carrying Value for Residential Loans Held-for-Investment at Amortized Cost (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]    
Carrying Value $ 3,287,587 $ 2,166,434
Residential Loans Held For Investment At Amortized Cost
   
Mortgage Loans on Real Estate [Line Items]    
Principal balance 1,554,876 1,770,803
Unamortized premium, net 13,540 16,791
Recorded investment 1,568,416 1,787,594
Allowance for loan losses (21,909) (25,427)
Carrying Value $ 1,546,507 $ 1,762,167