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Schedule of Fair Value of MSRs and Aggregate Principal Amounts of Associated Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Servicing Assets at Fair Value [Line Items]    
MSR Fair Value $ 135,152 $ 64,824
Associated Principal 12,216,816 5,791,758
Conforming Loan
   
Servicing Assets at Fair Value [Line Items]    
MSR Fair Value 73,953 3,331
Associated Principal 6,254,058 308,258
Jumbo Loan
   
Servicing Assets at Fair Value [Line Items]    
MSR Fair Value 61,199 61,493
Associated Principal $ 5,962,758 $ 5,483,500