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Fair Value Measurements - Unobservable Inputs Assumptions - Non-Agency RMBS Held for Investment (Detail) - Level 3
Dec. 31, 2016
Dec. 31, 2015
Non-Agency RMBS - Senior    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Significant unobservable input, discount rate 5.40% 5.50%
Non-Agency RMBS - Senior interest-only    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Significant unobservable input, discount rate 12.50% 13.10%
Non-Agency RMBS - Subordinated    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Significant unobservable input, discount rate 6.20% 6.60%
Non-Agency RMBS - Subordinated interest-only    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Significant unobservable input, discount rate 13.20% 17.40%
Minimum | Non-Agency RMBS - Senior    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Significant unobservable input, prepayment rate 1.00% 1.00%
Significant unobservable input, default rate 0.00% 0.00%
Significant unobservable input, loss severity rate 35.00% 35.00%
Minimum | Non-Agency RMBS - Senior interest-only    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Significant unobservable input, prepayment rate 3.00% 3.00%
Significant unobservable input, default rate 0.00% 0.00%
Significant unobservable input, loss severity rate 35.00% 1.00%
Minimum | Non-Agency RMBS - Subordinated    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Significant unobservable input, prepayment rate 1.00% 1.00%
Significant unobservable input, default rate 0.00% 0.00%
Significant unobservable input, loss severity rate 0.00% 5.00%
Minimum | Non-Agency RMBS - Subordinated interest-only    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Significant unobservable input, prepayment rate 6.00% 6.00%
Significant unobservable input, default rate 0.00% 0.00%
Significant unobservable input, loss severity rate 35.00% 1.00%
Maximum | Non-Agency RMBS - Senior    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Significant unobservable input, prepayment rate 35.00% 17.00%
Significant unobservable input, default rate 22.00% 22.00%
Significant unobservable input, loss severity rate 95.00% 95.00%
Maximum | Non-Agency RMBS - Senior interest-only    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Significant unobservable input, prepayment rate 30.00% 25.00%
Significant unobservable input, default rate 22.00% 23.00%
Significant unobservable input, loss severity rate 95.00% 95.00%
Maximum | Non-Agency RMBS - Subordinated    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Significant unobservable input, prepayment rate 25.00% 22.00%
Significant unobservable input, default rate 18.00% 20.00%
Significant unobservable input, loss severity rate 79.00% 91.00%
Maximum | Non-Agency RMBS - Subordinated interest-only    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Significant unobservable input, prepayment rate 15.00% 13.00%
Significant unobservable input, default rate 11.00% 10.00%
Significant unobservable input, loss severity rate 76.00% 64.00%