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Summary of Carrying Value Components of Collateral for Asset-Backed Securities Issued and Outstanding (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued $ 2,013,807 $ 2,292,378
Residential Loans
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 1,546,507 1,762,167
Commercial Loans
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 204,741 257,741
Real Estate Securities
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 233,311 263,204
Restricted Cash
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 285 289
Accrued Interest Receivable
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 3,915 5,316
REO
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued   3,661
Other Assets
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 25,048  
Sequoia
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 1,551,885 1,768,694
Sequoia | Residential Loans
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 1,546,507 1,762,167
Sequoia | Restricted Cash
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 147 152
Sequoia | Accrued Interest Receivable
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 1,882 2,714
Sequoia | REO
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued   3,661
Sequoia | Other Assets
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 3,349  
Residential Resecuritization
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 233,817 263,831
Residential Resecuritization | Real Estate Securities
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 233,311 263,204
Residential Resecuritization | Accrued Interest Receivable
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 506 627
Commercial Securitization
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 228,105 259,853
Commercial Securitization | Commercial Loans
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 204,741 257,741
Commercial Securitization | Restricted Cash
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 138 137
Commercial Securitization | Accrued Interest Receivable
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued 1,527 1,975
Commercial Securitization | Other Assets
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Collateral for ABS Issued $ 21,699