INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MORTGAGE SERVICING RIGHTS FINANCING RECEIVABLES - Narrative (Details) $ in Millions							3 Months Ended
	Mar. 28, 2018 USD ($)	Feb. 28, 2018 USD ($)	Jan. 18, 2018 USD ($)	Jan. 16, 2018 USD ($)	Nov. 29, 2017 USD ($)	Jul. 23, 2017	Mar. 31, 2018 USD ($) earnout_payment	Jan. 01, 2018 USD ($)
Schedule of MSRs [Line Items]
Number Of earnout payments | earnout_payment							3
Initial contract term (in years)						5 years
Contract extension term with thirty day notice (in months)						3 months
Ocwen
Schedule of MSRs [Line Items]
UPB of Underlying Mortgages								$ 86,800.0
Payments to acquire MSRs			$ 279.6
Ocwen
Schedule of MSRs [Line Items]
Subservicer percent of UPB							28.60%
Ocwen | New Residential Mortgage LLC | MSRs
Schedule of MSRs [Line Items]
Payments to acquire MSRs							$ 334.2
UPB of underlying loans, transferred							$ 15,500.0
Nationstar
Schedule of MSRs [Line Items]
Subservicer percent of UPB							27.70%
Ditech Financial LLC
Schedule of MSRs [Line Items]
Subservicer percent of UPB							23.40%
Ditech Financial LLC | New Residential Mortgage LLC
Schedule of MSRs [Line Items]
Payments to acquire MSRs							$ 8.1
Ditech Financial LLC | New Residential Mortgage LLC | MSRs
Schedule of MSRs [Line Items]
UPB of Underlying Mortgages							$ 1,000.0
PHH Mortgage Corporation
Schedule of MSRs [Line Items]
Subservicer percent of UPB							13.90%
PHH Mortgage Corporation | New Residential Mortgage LLC | MSRs
Schedule of MSRs [Line Items]
UPB of underlying mortgages, amount unsettled							$ 5,700.0
PHH Mortgage Corporation | New Residential Mortgage LLC | Seasoned Agency Loans
Schedule of MSRs [Line Items]
Payments to acquire MSRs, amount unsettled							$ 33.6
ShellPoint
Schedule of MSRs [Line Items]
Subservicer percent of UPB							5.60%
ShellPoint | NRM Acquisition LLC
Schedule of MSRs [Line Items]
Payments to acquire businesses, gross					$ 150.0
Earnout payment, maximum amount					$ 60.0
Earnout payments, percent allocated to sellers					92.00%
Earnout payments, percent allocated to long-term employee incentive plan					8.00%
ShellPoint | NRM Acquisition LLC | MSRs
Schedule of MSRs [Line Items]
UPB of Underlying Mortgages					$ 7,800.0
Payments to acquire MSRs					$ 81.0
Flagstar
Schedule of MSRs [Line Items]
Subservicer percent of UPB							0.80%
Walter Capital Opportunity | New Residential Mortgage LLC
Schedule of MSRs [Line Items]
Payments to acquire MSRs				$ 101.5
Walter Capital Opportunity | New Residential Mortgage LLC | MSRs
Schedule of MSRs [Line Items]
UPB of Underlying Mortgages				$ 11,500.0
Other Seller 1 | NRM Acquisition LLC | MSRs
Schedule of MSRs [Line Items]
UPB of Underlying Mortgages		$ 3,300.0
Payments to acquire MSRs		$ 33.5
Other Seller 2 | NRM Acquisition LLC | MSRs
Schedule of MSRs [Line Items]
UPB of Underlying Mortgages	$ 7,900.0
Payments to acquire MSRs	$ 95.2