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Securitized Debt - Narrative (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Debt Instrument [Line Items]      
Loss on extinguishment of debt $ 0 $ 1,766  
Securitized Loans | Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure | Non-agency MBS      
Debt Instrument [Line Items]      
Principal balance of debt $ 319,000   $ 350,000
Weighted average cost of financing 5.39%   5.21%
Securitized Loans | Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure | Loans Held for Investment      
Debt Instrument [Line Items]      
Principal balance of debt $ 10,200,000   $ 7,100,000
Weighted average cost of financing 4.10%   3.99%
Net unrealized loss on financial instruments at fair value $ 39,000    
Net unrealized gains on financial instruments at fair value 10,000    
Securitized Loans | Variable Interest Entity, Primary Beneficiary | Loans Held for Investment      
Debt Instrument [Line Items]      
Acquired securitized debt collateral outstanding principal balance 44,000    
Repurchase of securitized debt borrowings, collateralized by Non-Agency RMBS 46,000    
Loss on extinguishment of debt $ 2,000