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FAIR VALUE MEASUREMENT - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis using Level 3 Inputs (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Non-Agency
Gains (losses) included in net income
Included in gain (loss) on settlement of investments, net		$ (1,000)
Excess MSRs Investees
Purchases, sales and repayments
New Residential’s ownership	50.00%	50.00%	50.00%
Recurring Basis
Purchases, sales and repayments
Mortgage backed securities, issued at fair value	$ 117,500	$ 117,500
Recurring Basis \| Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		13,681,878
Transfers from Level 3		0
Transfers to Level 3		0
Shellpoint Acquisition		318,739
Gains (losses) included in net income
Included in other-than-temporary impairment on securities		(18,113)
Included in change in fair value of investments in excess mortgage servicing rights		(55,711)
Included in change in fair value of investments in excess mortgage servicing rights, equity method investees		5,624
Included in servicing revenue, net		31,252
Included in change in fair value of investments in mortgage servicing rights financing receivables		63,628
Included in change in fair value of servicer advance investments		(86,581)
Included in gain (loss) on settlement of investments, net		112,008
Included in other income (loss), net		13,663
Gains (losses) included in other comprehensive income		97,538
Interest income		314,529
Purchases, sales and repayments
Purchases		6,269,598
Proceeds from sales		(116,587)
Proceeds from repayments		(2,696,057)
Other		17,282
New Ocwen Agreements		(2,823,412)
Balance, ending	15,129,278	15,129,278
Fair Value, Liabilities Measured on Recurring Basis, Gains (losses) included in net income [Abstract]
Balance, beginning		0
Transfers from Level 3		0
Transfers to Level 3		0
Shellpoint Acquisition		211,734
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Included in other-than-temporary impairment on securities		0
Included in change in fair value of investments in excess mortgage servicing rights		0
Included in change in fair value of investments in excess mortgage servicing rights, equity method investees		0
Included in servicing revenue, net		(3,888)
Included in change in fair value of investments in mortgage servicing rights financing receivables		0
Included in change in fair value of servicer advance investments		0
Included in gain (loss) on settlement of investments, net		0
Included in other income (loss), net		(900)
Gains (losses) included in other comprehensive income		0
Interest income		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]
Purchases		0
Proceeds from sales		0
Proceeds from repayments		(2,332)
Other		0
Ocwen Transaction		0
Balance, ending	204,614	204,614
Recurring Basis \| Level 3 \| Servicer Advances
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		4,027,379
Transfers from Level 3		0
Transfers to Level 3		0
Shellpoint Acquisition		0
Gains (losses) included in net income
Included in other-than-temporary impairment on securities		0
Included in change in fair value of investments in excess mortgage servicing rights		0
Included in change in fair value of investments in excess mortgage servicing rights, equity method investees		0
Included in servicing revenue, net		0
Included in change in fair value of investments in mortgage servicing rights financing receivables		0
Included in change in fair value of servicer advance investments		(86,581)
Included in gain (loss) on settlement of investments, net		72,585
Included in other income (loss), net		0
Gains (losses) included in other comprehensive income		0
Interest income		43,122
Purchases, sales and repayments
Purchases		1,817,581
Proceeds from sales
Proceeds from repayments		(1,871,312)
Other		0
New Ocwen Agreements		(3,202,838)
Balance, ending	799,936	799,936
Recurring Basis \| Level 3 \| MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		1,735,504
Transfers from Level 3		0
Transfers to Level 3		0
Shellpoint Acquisition		286,600
Gains (losses) included in net income
Included in other-than-temporary impairment on securities		0
Included in change in fair value of investments in excess mortgage servicing rights		0
Included in change in fair value of investments in excess mortgage servicing rights, equity method investees		0
Included in servicing revenue, net		31,252
Included in change in fair value of investments in mortgage servicing rights financing receivables		0
Included in change in fair value of servicer advance investments		0
Included in gain (loss) on settlement of investments, net		0
Included in other income (loss), net		0
Gains (losses) included in other comprehensive income		0
Interest income		0
Purchases, sales and repayments
Purchases		801,366
Proceeds from sales		0
Proceeds from repayments		0
Other		17,282
New Ocwen Agreements		0
Balance, ending	2,872,004	2,872,004
Recurring Basis \| Level 3 \| Mortgage Servicing Rights Financing Receivable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		598,728
Transfers from Level 3		0
Transfers to Level 3		0
Shellpoint Acquisition		(135,288)
Gains (losses) included in net income
Included in other-than-temporary impairment on securities		0
Included in change in fair value of investments in excess mortgage servicing rights		0
Included in change in fair value of investments in excess mortgage servicing rights, equity method investees		0
Included in servicing revenue, net		0
Included in change in fair value of investments in mortgage servicing rights financing receivables		63,628
Included in change in fair value of servicer advance investments		0
Included in gain (loss) on settlement of investments, net		0
Included in other income (loss), net		0
Gains (losses) included in other comprehensive income		0
Interest income		0
Purchases, sales and repayments
Purchases		138,993
Proceeds from sales		(2,982)
Proceeds from repayments		0
Other		0
New Ocwen Agreements		1,017,993
Balance, ending	1,681,072	1,681,072
Recurring Basis \| Level 3 \| Non-Agency
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		5,974,789
Transfers from Level 3		0
Transfers to Level 3		0
Shellpoint Acquisition		0
Gains (losses) included in net income
Included in other-than-temporary impairment on securities		(18,113)
Included in change in fair value of investments in excess mortgage servicing rights		0
Included in change in fair value of investments in excess mortgage servicing rights, equity method investees		0
Included in servicing revenue, net		0
Included in change in fair value of investments in mortgage servicing rights financing receivables		0
Included in change in fair value of servicer advance investments		0
Included in gain (loss) on settlement of investments, net		(994)
Included in other income (loss), net		12,001
Gains (losses) included in other comprehensive income		97,538
Interest income		239,036
Purchases, sales and repayments
Purchases		3,475,138
Proceeds from sales		(81,325)
Proceeds from repayments		(721,676)
Other		0
New Ocwen Agreements		0
Balance, ending	8,976,394	8,976,394
Recurring Basis \| Level 3 \| Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		0
Transfers from Level 3		0
Transfers to Level 3		0
Shellpoint Acquisition		10,604
Gains (losses) included in net income
Included in other-than-temporary impairment on securities		0
Included in change in fair value of investments in excess mortgage servicing rights		0
Included in change in fair value of investments in excess mortgage servicing rights, equity method investees		0
Included in servicing revenue, net		0
Included in change in fair value of investments in mortgage servicing rights financing receivables		0
Included in change in fair value of servicer advance investments		0
Included in gain (loss) on settlement of investments, net		0
Included in other income (loss), net		(2,247)
Gains (losses) included in other comprehensive income		0
Interest income		0
Purchases, sales and repayments
Purchases		0
Proceeds from sales		0
Proceeds from repayments		0
Other		0
New Ocwen Agreements		0
Balance, ending	8,357	8,357
Recurring Basis \| Level 3 \| Residential Mortgage Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		0
Transfers from Level 3		0
Transfers to Level 3		0
Shellpoint Acquisition		156,823
Gains (losses) included in net income
Included in other-than-temporary impairment on securities		0
Included in change in fair value of investments in excess mortgage servicing rights		0
Included in change in fair value of investments in excess mortgage servicing rights, equity method investees		0
Included in servicing revenue, net		0
Included in change in fair value of investments in mortgage servicing rights financing receivables		0
Included in change in fair value of servicer advance investments		0
Included in gain (loss) on settlement of investments, net		0
Included in other income (loss), net		(692)
Gains (losses) included in other comprehensive income		0
Interest income		0
Purchases, sales and repayments
Purchases		36,520
Proceeds from sales		(19,900)
Proceeds from repayments		(3,236)
Other		0
New Ocwen Agreements		0
Balance, ending	169,515	169,515
Recurring Basis \| Level 3 \| Excess Spread Financing
Fair Value, Liabilities Measured on Recurring Basis, Gains (losses) included in net income [Abstract]
Balance, beginning		0
Transfers from Level 3		0
Transfers to Level 3		0
Shellpoint Acquisition		48,262
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Included in other-than-temporary impairment on securities		0
Included in change in fair value of investments in excess mortgage servicing rights		0
Included in change in fair value of investments in excess mortgage servicing rights, equity method investees		0
Included in servicing revenue, net	(3,900)	(3,888)
Included in change in fair value of investments in mortgage servicing rights financing receivables		0
Included in change in fair value of servicer advance investments		0
Included in gain (loss) on settlement of investments, net		0
Included in other income (loss), net		0
Gains (losses) included in other comprehensive income		0
Interest income		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]
Purchases		0
Proceeds from sales		0
Proceeds from repayments		0
Other		0
Ocwen Transaction		0
Balance, ending	44,374	44,374
Recurring Basis \| Level 3 \| Mortgage-Backed Securities Issued
Fair Value, Liabilities Measured on Recurring Basis, Gains (losses) included in net income [Abstract]
Balance, beginning		0
Transfers from Level 3		0
Transfers to Level 3		0
Shellpoint Acquisition		120,702
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Included in other-than-temporary impairment on securities		0
Included in change in fair value of investments in excess mortgage servicing rights		0
Included in change in fair value of investments in excess mortgage servicing rights, equity method investees		0
Included in servicing revenue, net		0
Included in change in fair value of investments in mortgage servicing rights financing receivables		0
Included in change in fair value of servicer advance investments		0
Included in gain (loss) on settlement of investments, net		0
Included in other income (loss), net		(900)
Gains (losses) included in other comprehensive income		0
Interest income		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]
Purchases		0
Proceeds from sales		0
Proceeds from repayments		(2,332)
Other		0
Ocwen Transaction		0
Balance, ending	117,470	117,470
Recurring Basis \| Level 3 \| Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Gains (losses) included in net income [Abstract]
Balance, beginning		0
Transfers from Level 3		0
Transfers to Level 3		0
Shellpoint Acquisition		42,770
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Included in other-than-temporary impairment on securities		0
Included in change in fair value of investments in excess mortgage servicing rights		0
Included in change in fair value of investments in excess mortgage servicing rights, equity method investees		0
Included in servicing revenue, net		0
Included in change in fair value of investments in mortgage servicing rights financing receivables		0
Included in change in fair value of servicer advance investments		0
Included in gain (loss) on settlement of investments, net		0
Included in other income (loss), net		0
Gains (losses) included in other comprehensive income		0
Interest income		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]
Purchases		0
Proceeds from sales		0
Proceeds from repayments		0
Other		0
Ocwen Transaction		0
Balance, ending	42,770	42,770
Recurring Basis \| Level 3 \| MSRs Agency
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		324,636
Transfers from Level 3		0
Transfers to Level 3		0
Shellpoint Acquisition		0
Gains (losses) included in net income
Included in other-than-temporary impairment on securities		0
Included in change in fair value of investments in excess mortgage servicing rights		(14,738)
Included in change in fair value of investments in excess mortgage servicing rights, equity method investees		0
Included in servicing revenue, net		0
Included in change in fair value of investments in mortgage servicing rights financing receivables		0
Included in change in fair value of servicer advance investments		0
Included in gain (loss) on settlement of investments, net		0
Included in other income (loss), net		4,401
Gains (losses) included in other comprehensive income		0
Interest income		16,954
Purchases, sales and repayments
Purchases		0
Proceeds from sales		(12,380)
Proceeds from repayments		(45,020)
Other		0
New Ocwen Agreements		0
Balance, ending	273,853	273,853
Recurring Basis \| Level 3 \| MSRs Agency \| Excess MSRs Investees
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		171,765
Transfers from Level 3		0
Transfers to Level 3		0
Shellpoint Acquisition		0
Gains (losses) included in net income
Included in other-than-temporary impairment on securities		0
Included in change in fair value of investments in excess mortgage servicing rights		0
Included in change in fair value of investments in excess mortgage servicing rights, equity method investees		5,624
Included in servicing revenue, net		0
Included in change in fair value of investments in mortgage servicing rights financing receivables		0
Included in change in fair value of servicer advance investments		0
Included in gain (loss) on settlement of investments, net		0
Included in other income (loss), net		0
Gains (losses) included in other comprehensive income		0
Interest income		0
Purchases, sales and repayments
Purchases		0
Proceeds from sales		0
Proceeds from repayments		(22,450)
Other		0
New Ocwen Agreements		0
Balance, ending	154,939	154,939
Recurring Basis \| Level 3 \| MSRs Non-Agency
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning		849,077
Transfers from Level 3		0
Transfers to Level 3		0
Shellpoint Acquisition		0
Gains (losses) included in net income
Included in other-than-temporary impairment on securities		0
Included in change in fair value of investments in excess mortgage servicing rights		(40,973)
Included in change in fair value of investments in excess mortgage servicing rights, equity method investees		0
Included in servicing revenue, net		0
Included in change in fair value of investments in mortgage servicing rights financing receivables		0
Included in change in fair value of servicer advance investments		0
Included in gain (loss) on settlement of investments, net		40,417
Included in other income (loss), net		200
Gains (losses) included in other comprehensive income		0
Interest income		15,417
Purchases, sales and repayments
Purchases		0
Proceeds from sales		0
Proceeds from repayments		(32,363)
Other		0
New Ocwen Agreements		(638,567)
Balance, ending	$ 193,208	$ 193,208