EXCESS MORTGAGE SERVICING RIGHTS - Summary of Investments in Excess MSRs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Weighted Average Life (Years)	4 years
Original and recaptured pools
Schedule of Equity Method Investments [Line Items]
Original and Recaptured Pools	$ (15,227)	$ (2,962)	$ (15,078)
Corporate Joint Venture | Servicer advance investments
Schedule of Equity Method Investments [Line Items]
UPB	15,499,559	17,033,753
Excess MSRs
Schedule of Equity Method Investments [Line Items]
UPB	$ 42,957,347	$ 48,154,644
Weighted Average Life (Years)	6 years 3 months 18 days	6 years 3 months 18 days
Amortized Cost Basis	$ 181,721	$ 207,470
Carrying Value	$ 208,385	$ 249,366
Excess MSRs | Minimum
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	32.50%	32.50%
Excess MSRs | Minimum | Former Manager-managed funds
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	0.00%	0.00%
Excess MSRs | Minimum | Mr. Cooper
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	0.00%	0.00%
Excess MSRs | Maximum
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	100.00%	100.00%
Excess MSRs | Maximum | Former Manager-managed funds
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	50.00%	50.00%
Excess MSRs | Maximum | Mr. Cooper
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	35.00%	35.00%
Excess MSRs | Weighted Average
Schedule of Equity Method Investments [Line Items]
Interest in Excess MSR	56.50%	56.50%