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TRANSACTIONS WITH AFFILIATES AND AFFILIATED ENTITIES - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]        
Management agreement, renewal term (in years)   1 year    
Termination fee, number of months' pay (in months)   12 months    
Proportion of directors' votes needed to terminate   0.6667    
Accruals for MSR Fund Payments   $ 0.3 $ 0.5 $ 4.4
Amount of securities transferred to MSR Fund Payments   $ 1.4 $ 0.1  
Credit Concentration Risk | Investment Interest Income - Excess MSRs | Nationstar        
Related Party Transaction [Line Items]        
Percentage of UPB of loans underlying investments   66.10%    
Credit Concentration Risk | Investment Interest Income - MSRs | Nationstar        
Related Party Transaction [Line Items]        
Percentage of UPB of loans underlying investments   41.20%    
Credit Concentration Risk | Investment Interest Income - Servicer Advances | Nationstar        
Related Party Transaction [Line Items]        
Percentage of UPB of loans underlying investments   35.00%    
Manager        
Related Party Transaction [Line Items]        
Management fee rate (percent)   1.50%    
Incentive compensation percentage   25.00%    
Interest rate for incentive compensation   10.00%    
FIG LLC        
Related Party Transaction [Line Items]        
Increase incentive compensation $ 3.3      
Nationstar | Residential Mortgage Loans        
Related Party Transaction [Line Items]        
UPB of Underlying Mortgages   $ 787.5    
Nationstar | Real Estate Owned        
Related Party Transaction [Line Items]        
Unpaid balance of real estate owned   20.5    
Nationstar | Residential Mortgage Backed Securities        
Related Party Transaction [Line Items]        
Face amount of investment   3,300.0    
UPB of Underlying Mortgages   $ 19,000.0    
Redemption premium percentage   0.75%    
Nationstar | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises        
Related Party Transaction [Line Items]        
Face amount of investment   $ 106.6