Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN EXCESS MORTGAGE SERVICING RIGHTS - Summary of Excess MSRs Made Through Equity Method Investees (Details)

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INVESTMENTS IN EXCESS MORTGAGE SERVICING RIGHTS - Summary of Excess MSRs Made Through Equity Method Investees (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Schedule of Investments in Mortgage Servicing Rights [Line Items]    
Unpaid Principal Balance $ 84,100,000  
Weighted Average Life (Years) 1 year 8 days  
Excess MSRs Investees    
Schedule of Investments in Mortgage Servicing Rights [Line Items]    
Unpaid Principal Balance $ 44,239,405  
New Residential Interest in Investees 50.00% 50.00%
Amortized Cost Basis $ 210,133  
Carrying Value $ 284,957  
Weighted Average Life (Years) 6 years 3 months 12 days  
Excess MSRs Investees | Agency    
Schedule of Investments in Mortgage Servicing Rights [Line Items]    
New Residential Interest in Investees 50.00%  
Excess MSRs Investees | Agency | Original and Recaptured Pools    
Schedule of Investments in Mortgage Servicing Rights [Line Items]    
Unpaid Principal Balance $ 44,239,405  
Investee Interest in Excess MSR 66.70%  
New Residential Interest in Investees 50.00%  
Amortized Cost Basis $ 189,567  
Carrying Value $ 245,562  
Weighted Average Life (Years) 5 years 6 months 28 days  
Excess MSRs Investees | Agency | Recapture Agreements    
Schedule of Investments in Mortgage Servicing Rights [Line Items]    
Unpaid Principal Balance $ 0  
Investee Interest in Excess MSR 66.70%  
New Residential Interest in Investees 50.00%  
Amortized Cost Basis $ 20,566  
Carrying Value $ 39,395  
Weighted Average Life (Years) 12 years 9 months 18 days