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Assets and Liabilities of Consolidated Variable Interest Entity's (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Entity
Dec. 31, 2013
Variable Interest Entity [Line Items]    
Assets $ 2,125,423 $ 2,299,576
Liabilities 1,769,851 1,944,911
Number of VIEs 26  
Residential Loans Held for Investment
    
Variable Interest Entity [Line Items]    
Assets 1,616,504  
Commercial Loans Held For Investment
    
Variable Interest Entity [Line Items]    
Assets 254,615  
Real Estate Securities
    
Variable Interest Entity [Line Items]    
Assets 245,853  
Restricted Cash
    
Variable Interest Entity [Line Items]    
Assets 283  
Accrued Interest Receivable
    
Variable Interest Entity [Line Items]    
Assets 4,766  
Other Assets
    
Variable Interest Entity [Line Items]    
Assets 3,402  
Accrued Interest Payable
    
Variable Interest Entity [Line Items]    
Liabilities 1,773  
Asset-backed Securities
    
Variable Interest Entity [Line Items]    
Liabilities 1,768,078  
Sequoia
    
Variable Interest Entity [Line Items]    
Assets 1,622,363  
Liabilities 1,554,747  
Number of VIEs 24  
Sequoia | Residential Loans Held for Investment
    
Variable Interest Entity [Line Items]    
Assets 1,616,504  
Sequoia | Restricted Cash
    
Variable Interest Entity [Line Items]    
Assets 145  
Sequoia | Accrued Interest Receivable
    
Variable Interest Entity [Line Items]    
Assets 2,391  
Sequoia | Other Assets
    
Variable Interest Entity [Line Items]    
Assets 3,323  
Sequoia | Accrued Interest Payable
    
Variable Interest Entity [Line Items]    
Liabilities 1,078  
Sequoia | Asset-backed Securities
    
Variable Interest Entity [Line Items]    
Liabilities 1,553,669  
Residential Resecuritization
    
Variable Interest Entity [Line Items]    
Assets 246,402  
Liabilities 69,726  
Number of VIEs 1  
Residential Resecuritization | Real Estate Securities
    
Variable Interest Entity [Line Items]    
Assets 245,853  
Residential Resecuritization | Accrued Interest Receivable
    
Variable Interest Entity [Line Items]    
Assets 549  
Residential Resecuritization | Accrued Interest Payable
    
Variable Interest Entity [Line Items]    
Liabilities 17  
Residential Resecuritization | Asset-backed Securities
    
Variable Interest Entity [Line Items]    
Liabilities 69,709  
Commercial Securitization
    
Variable Interest Entity [Line Items]    
Assets 256,658  
Liabilities 145,378  
Number of VIEs 1  
Commercial Securitization | Commercial Loans Held For Investment
    
Variable Interest Entity [Line Items]    
Assets 254,615  
Commercial Securitization | Restricted Cash
    
Variable Interest Entity [Line Items]    
Assets 138  
Commercial Securitization | Accrued Interest Receivable
    
Variable Interest Entity [Line Items]    
Assets 1,826  
Commercial Securitization | Other Assets
    
Variable Interest Entity [Line Items]    
Assets 79  
Commercial Securitization | Accrued Interest Payable
    
Variable Interest Entity [Line Items]    
Liabilities 678  
Commercial Securitization | Asset-backed Securities
    
Variable Interest Entity [Line Items]    
Liabilities $ 144,700