INVESTMENTS IN EXCESS MORTGAGE SERVICING RIGHTS - Summary of Excess MSRs Made Through Equity Method Investees (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Schedule of Investments in Mortgage Servicing Rights [Line Items]
Weighted Average Life (Years)	1 year 4 months 30 days
Excess MSRs Investees
Schedule of Investments in Mortgage Servicing Rights [Line Items]
Unpaid Principal Balance	$ 49,435,804
New Residential Interest in Investees	50.00%	50.00%
Amortized Cost Basis	$ 226,481
Carrying Value	$ 309,322
Weighted Average Life (Years)	6 years 1 month 11 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	$ 49,435,804
Investee Interest in Excess MSR	66.70%
New Residential Interest in Investees	50.00%
Amortized Cost Basis	$ 203,978
Carrying Value	$ 262,014
Weighted Average Life (Years)	5 years 5 months 4 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	$ 22,503
Carrying Value	$ 47,308
Weighted Average Life (Years)	12 years 3 months 30 days

The equity method investee's percentage ownership of Excess MSRs portfolio.

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- Definition

[Line Items] for Schedule of Investments in Mortgage Servicing Rights [Table]

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- Definition

The unpaid principal balance of underlying loans.

+ References

No definition available.

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- Definition

Weighted average expected timing of the receipt of expected cash flows for this investment.

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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- Definition

Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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