Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN EXCESS MORTGAGE SERVICING RIGHTS - Summary of Direct Investments in Excess MSRs (Details)

v3.19.2
INVESTMENTS IN EXCESS MORTGAGE SERVICING RIGHTS - Summary of Direct Investments in Excess MSRs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Investment [Line Items]          
UPB of Underlying Mortgages $ 74,500,000   $ 74,500,000    
Weighted Average Life (Years)     24 days    
Servicer Advance Investments | Servicer Advances          
Investment [Line Items]          
UPB of Underlying Mortgages 35,458,272   $ 35,458,272   $ 40,096,998
Original and Recaptured Pools          
Investment [Line Items]          
Original and Recaptured Pools (8,455) $ (5,276) (3,828) $ (50,967)  
Excess MSRs          
Investment [Line Items]          
UPB of Underlying Mortgages 98,544,892   $ 98,544,892    
Weighted Average Life (Years)     5 years 9 months 18 days    
Amortized Cost Basis 328,591   $ 328,591    
Carrying Value 411,537   411,537   447,860
Excess MSRs | Nationstar          
Investment [Line Items]          
Carrying Value 409,455   409,455   445,328
Excess MSRs | Agency | Original and Recaptured Pools          
Investment [Line Items]          
UPB of Underlying Mortgages 48,657,313   $ 48,657,313    
Weighted Average Life (Years)     5 years 6 months    
Amortized Cost Basis 193,893   $ 193,893    
Carrying Value $ 231,092   $ 231,092   257,387
Excess MSRs | Agency | Original and Recaptured Pools | Minimum          
Investment [Line Items]          
Interest in Excess MSR 32.50%   32.50%    
Excess MSRs | Agency | Original and Recaptured Pools | Maximum          
Investment [Line Items]          
Interest in Excess MSR 66.70%   66.70%    
Excess MSRs | Agency | Original and Recaptured Pools | Weighted Average          
Investment [Line Items]          
Interest in Excess MSR 53.30%   53.30%    
Excess MSRs | Agency | Recapture Agreement | Minimum          
Investment [Line Items]          
Interest in Excess MSR 32.50%   32.50%    
Excess MSRs | Agency | Recapture Agreement | Maximum          
Investment [Line Items]          
Interest in Excess MSR 66.70%   66.70%    
Excess MSRs | Agency | Recapture Agreement | Weighted Average          
Investment [Line Items]          
Interest in Excess MSR 53.30%   53.30%    
Excess MSRs | Agency | Fortress-managed funds | Original and Recaptured Pools | Minimum          
Investment [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs | Agency | Fortress-managed funds | Original and Recaptured Pools | Maximum          
Investment [Line Items]          
Interest in Excess MSR 40.00%   40.00%    
Excess MSRs | Agency | Fortress-managed funds | Recapture Agreement | Minimum          
Investment [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs | Agency | Fortress-managed funds | Recapture Agreement | Maximum          
Investment [Line Items]          
Interest in Excess MSR 40.00%   40.00%    
Excess MSRs | Agency | Nationstar | Original and Recaptured Pools | Minimum          
Investment [Line Items]          
Interest in Excess MSR 20.00%   20.00%    
Excess MSRs | Agency | Nationstar | Original and Recaptured Pools | Maximum          
Investment [Line Items]          
Interest in Excess MSR 35.00%   35.00%    
Excess MSRs | Agency | Nationstar | Recapture Agreement | Minimum          
Investment [Line Items]          
Interest in Excess MSR 20.00%   20.00%    
Excess MSRs | Agency | Nationstar | Recapture Agreement | Maximum          
Investment [Line Items]          
Interest in Excess MSR 35.00%   35.00%    
Excess MSRs | Non-Agency | Original and Recaptured Pools          
Investment [Line Items]          
UPB of Underlying Mortgages $ 49,887,579   $ 49,887,579    
Weighted Average Life (Years)     6 years 3 months 18 days    
Amortized Cost Basis 134,698   $ 134,698    
Carrying Value $ 180,445   $ 180,445   $ 190,473
Excess MSRs | Non-Agency | Original and Recaptured Pools | Minimum          
Investment [Line Items]          
Interest in Excess MSR 33.30%   33.30%    
Excess MSRs | Non-Agency | Original and Recaptured Pools | Maximum          
Investment [Line Items]          
Interest in Excess MSR 100.00%   100.00%    
Excess MSRs | Non-Agency | Original and Recaptured Pools | Weighted Average          
Investment [Line Items]          
Interest in Excess MSR 59.40%   59.40%    
Excess MSRs | Non-Agency | Recapture Agreement | Minimum          
Investment [Line Items]          
Interest in Excess MSR 33.30%   33.30%    
Excess MSRs | Non-Agency | Recapture Agreement | Maximum          
Investment [Line Items]          
Interest in Excess MSR 100.00%   100.00%    
Excess MSRs | Non-Agency | Recapture Agreement | Weighted Average          
Investment [Line Items]          
Interest in Excess MSR 59.40%   59.40%    
Excess MSRs | Non-Agency | Fortress-managed funds | Original and Recaptured Pools | Minimum          
Investment [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs | Non-Agency | Fortress-managed funds | Original and Recaptured Pools | Maximum          
Investment [Line Items]          
Interest in Excess MSR 50.00%   50.00%    
Excess MSRs | Non-Agency | Fortress-managed funds | Recapture Agreement | Minimum          
Investment [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs | Non-Agency | Fortress-managed funds | Recapture Agreement | Maximum          
Investment [Line Items]          
Interest in Excess MSR 50.00%   50.00%    
Excess MSRs | Non-Agency | Nationstar | Original and Recaptured Pools | Minimum          
Investment [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs | Non-Agency | Nationstar | Original and Recaptured Pools | Maximum          
Investment [Line Items]          
Interest in Excess MSR 33.30%   33.30%    
Excess MSRs | Non-Agency | Nationstar | Recapture Agreement | Minimum          
Investment [Line Items]          
Interest in Excess MSR 0.00%   0.00%    
Excess MSRs | Non-Agency | Nationstar | Recapture Agreement | Maximum          
Investment [Line Items]          
Interest in Excess MSR 33.30%   33.30%