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Fair Value Measurements - Unobservable Inputs Assumptions - Non-Agency RMBS Held for Investment (Detail) - Level 3
Dec. 31, 2017
Dec. 31, 2016
Non-Agency RMBS - Senior    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average Discount Rate 4.40% 5.40%
Non-Agency RMBS - Senior interest-only    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average Discount Rate 11.20% 12.50%
Non-Agency RMBS - Subordinated    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average Discount Rate 5.80% 6.20%
Non-Agency RMBS - Subordinated interest-only    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average Discount Rate 12.00% 13.20%
Minimum | Non-Agency RMBS - Senior    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
CPR 1.00% 1.00%
CDR 0.00% 0.00%
Loss Severity 35.00% 35.00%
Minimum | Non-Agency RMBS - Senior interest-only    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
CPR 3.00% 3.00%
CDR 0.00% 0.00%
Loss Severity 35.00% 35.00%
Minimum | Non-Agency RMBS - Subordinated    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
CPR 1.00% 1.00%
CDR 0.00% 0.00%
Loss Severity 35.00% 0.00%
Minimum | Non-Agency RMBS - Subordinated interest-only    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
CPR 6.00% 6.00%
CDR 0.00% 0.00%
Loss Severity 35.00% 35.00%
Maximum | Non-Agency RMBS - Senior    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
CPR 45.00% 35.00%
CDR 55.00% 22.00%
Loss Severity 89.00% 95.00%
Maximum | Non-Agency RMBS - Senior interest-only    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
CPR 25.00% 30.00%
CDR 50.00% 22.00%
Loss Severity 95.00% 95.00%
Maximum | Non-Agency RMBS - Subordinated    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
CPR 20.00% 25.00%
CDR 33.00% 18.00%
Loss Severity 69.00% 79.00%
Maximum | Non-Agency RMBS - Subordinated interest-only    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
CPR 22.00% 15.00%
CDR 9.00% 11.00%
Loss Severity 63.00% 76.00%