FAIR VALUE MEASUREMENT - Fair Value Liabilities Measured at Fair Value on a Recurring Basis using Level 3 Inputs (Details) - Level 3 - Recurring Basis $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, liability, beginning balance	$ 0
Transfers
Transfers from Level 3	0
Transfers to Level 3	0
Shellpoint Acquisition	208,226
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	(8,591)
Included in change in fair value of investments in notes receivable - rights to MSRs	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	2,264
Gains (losses) included in other comprehensive income, net of tax	0
Interest income	0
Purchases, sales and repayments
Purchases	0
Proceeds from sales	0
Proceeds from repayments	(4,338)
Other	(367)
Ocwen Transaction	0
Fair value, liability, ending balance	197,194
Excess Spread Financing
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, liability, beginning balance	0
Transfers
Transfers from Level 3	0
Transfers to Level 3	0
Shellpoint Acquisition	48,262
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	(8,591)
Included in change in fair value of investments in notes receivable - rights to MSRs	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	0
Gains (losses) included in other comprehensive income, net of tax	0
Interest income	0
Purchases, sales and repayments
Purchases	0
Proceeds from sales	0
Proceeds from repayments	0
Other	(367)
Ocwen Transaction	0
Fair value, liability, ending balance	39,304
Mortgage Backed Securities Issued
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, liability, beginning balance	0
Transfers
Transfers from Level 3	0
Transfers to Level 3	0
Shellpoint Acquisition	120,702
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 notes receivable - rights to MSRs	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	684
Gains (losses) included in other comprehensive income, net of tax	0
Interest income	0
Purchases, sales and repayments
Purchases	0
Proceeds from sales	0
Proceeds from repayments	(4,338)
Other	0
Ocwen Transaction	0
Fair value, liability, ending balance	117,048
Contingent Consideration
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, liability, beginning balance	0
Transfers
Transfers from Level 3	0
Transfers to Level 3	0
Shellpoint Acquisition	39,262
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 notes receivable - rights to MSRs	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	1,580
Gains (losses) included in other comprehensive income, net of tax	0
Interest income	0
Purchases, sales and repayments
Purchases	0
Proceeds from sales	0
Proceeds from repayments	0
Other	0
Ocwen Transaction	0
Fair value, liability, ending balance	$ 40,842

Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Acquisitions

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Notes Receivable Rights to MSRs

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Servicer Advance Investments

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Settlement of Investments, Net

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Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

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Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sales of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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