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Assets and Liabilities of Consolidated Variable Interest Entity's (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Entity
Dec. 31, 2013
Variable Interest Entity [Line Items]    
Assets $ 2,013,807 $ 2,299,576
Liabilities 1,657,782 1,944,911
Number of VIEs 26  
Residential Loans Held for Investment
    
Variable Interest Entity [Line Items]    
Assets 1,546,507  
Commercial Loans Held For Investment
    
Variable Interest Entity [Line Items]    
Assets 204,741  
Real Estate Securities
    
Variable Interest Entity [Line Items]    
Assets 233,311  
Restricted Cash
    
Variable Interest Entity [Line Items]    
Assets 285  
Accrued Interest Receivable
    
Variable Interest Entity [Line Items]    
Assets 3,915  
Other Assets
    
Variable Interest Entity [Line Items]    
Assets 25,048  
Accrued Interest Payable
    
Variable Interest Entity [Line Items]    
Liabilities 1,580  
Asset-backed Securities
    
Variable Interest Entity [Line Items]    
Liabilities 1,656,202  
Sequoia
    
Variable Interest Entity [Line Items]    
Assets 1,551,885  
Liabilities 1,485,785  
Number of VIEs 24  
Sequoia | Residential Loans Held for Investment
    
Variable Interest Entity [Line Items]    
Assets 1,546,507  
Sequoia | Restricted Cash
    
Variable Interest Entity [Line Items]    
Assets 147  
Sequoia | Accrued Interest Receivable
    
Variable Interest Entity [Line Items]    
Assets 1,882  
Sequoia | Other Assets
    
Variable Interest Entity [Line Items]    
Assets 3,349  
Sequoia | Accrued Interest Payable
    
Variable Interest Entity [Line Items]    
Liabilities 1,034  
Sequoia | Asset-backed Securities
    
Variable Interest Entity [Line Items]    
Liabilities 1,484,751  
Residential Resecuritization
    
Variable Interest Entity [Line Items]    
Assets 233,817  
Liabilities 56,515  
Number of VIEs 1  
Residential Resecuritization | Real Estate Securities
    
Variable Interest Entity [Line Items]    
Assets 233,311  
Residential Resecuritization | Accrued Interest Receivable
    
Variable Interest Entity [Line Items]    
Assets 506  
Residential Resecuritization | Accrued Interest Payable
    
Variable Interest Entity [Line Items]    
Liabilities 7  
Residential Resecuritization | Asset-backed Securities
    
Variable Interest Entity [Line Items]    
Liabilities 56,508  
Commercial Securitization
    
Variable Interest Entity [Line Items]    
Assets 228,105  
Liabilities 115,482  
Number of VIEs 1  
Commercial Securitization | Commercial Loans Held For Investment
    
Variable Interest Entity [Line Items]    
Assets 204,741  
Commercial Securitization | Restricted Cash
    
Variable Interest Entity [Line Items]    
Assets 138  
Commercial Securitization | Accrued Interest Receivable
    
Variable Interest Entity [Line Items]    
Assets 1,527  
Commercial Securitization | Other Assets
    
Variable Interest Entity [Line Items]    
Assets 21,699  
Commercial Securitization | Accrued Interest Payable
    
Variable Interest Entity [Line Items]    
Liabilities 539  
Commercial Securitization | Asset-backed Securities
    
Variable Interest Entity [Line Items]    
Liabilities $ 114,943