Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
INVESTMENTS IN EXCESS MORTGAGE SERVICING RIGHTS - Summary of Direct Investments in Excess MSRs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Investment [Line Items]          
Weighted Average Life (Years)     24 days    
Carrying Value $ 5,243,229   $ 5,243,229   $ 4,528,604
Servicer Advance Investments | Servicer Advances          
Investment [Line Items]          
UPB of Underlying Mortgages 33,406,320   33,406,320   40,096,998
Original and Recaptured Pools          
Investment [Line Items]          
Original and Recaptured Pools 2,407 $ (4,744) (1,421) $ (55,711)  
Excess MSRs          
Investment [Line Items]          
UPB of Underlying Mortgages 93,025,190   $ 93,025,190    
Weighted Average Life (Years)     5 years 10 months 24 days    
Amortized Cost Basis 312,711   $ 312,711    
Carrying Value 398,064   398,064   447,860
Excess MSRs | Nationstar          
Investment [Line Items]          
Carrying Value 395,946   395,946   445,328
Excess MSRs | Agency | Original and Recaptured Pools          
Investment [Line Items]          
UPB of Underlying Mortgages 45,900,654   $ 45,900,654    
Weighted Average Life (Years)     5 years 4 months 24 days    
Amortized Cost Basis 183,064   $ 183,064    
Carrying Value $ 221,560   $ 221,560   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 $ 47,124,536   $ 47,124,536    
Weighted Average Life (Years)     6 years 6 months    
Amortized Cost Basis 129,647   $ 129,647    
Carrying Value $ 176,504   $ 176,504   $ 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%