FAIR VALUE MEASUREMENTS - Fair Value Liabilities Measured at Fair Value on a Recurring Basis using Level 3 Inputs (Details) - Recurring Basis - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,690,205	$ 1,347,594	$ 2,482,756	$ 772,925
Transfers:
Transfers out of Level 3		20,359	(735,874)	373,042
Computershare Acquisition (Note 3)				125,168
Gains (Losses) Included in Net Income:
Servicing revenue, net	8,094	(8,618)	2,396	(17,644)
Other income (loss)	6,700	4,381	12,074	15,704
Purchases, Issuance and Repayments:
Issuance	88,422	407,700	88,422	858,828
Repayments	(10,605)	(12,315)	(68,090)	(369,312)
Other	566	(1,662)	1,698	(1,272)
Ending balance	1,783,382	1,757,439	1,783,382	1,757,439
Asset-Backed Securities Issued
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			185,500
Purchases, Issuance and Repayments:
Ending balance	153,000		153,000
Asset-Backed Securities Issued | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	160,433	205,286	185,460	235,770
Transfers:
Transfers out of Level 3		0	0	0
Computershare Acquisition (Note 3)				0
Gains (Losses) Included in Net Income:
Servicing revenue, net	0	0	0	0
Other income (loss)	2,486	4,263	494	6,714
Purchases, Issuance and Repayments:
Issuance	0	0	0	0
Repayments	(9,900)	(12,315)	(32,935)	(45,250)
Other	0	0	0	0
Ending balance	153,019	197,234	153,019	197,234
Notes Payable and Secured Financing of Consolidated Entities | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	224,666	221,801	959,958	218,157
Transfers:
Transfers out of Level 3		0	(735,874)	0
Computershare Acquisition (Note 3)				0
Gains (Losses) Included in Net Income:
Servicing revenue, net	0	0	0	0
Other income (loss)	1,981	(4,542)	2,563	(898)
Purchases, Issuance and Repayments:
Issuance	0	0	0	0
Repayments	0	0	0	0
Other	0	0	0	0
Ending balance	226,647	217,259	226,647	217,259
Notes Payable of CFEs - Residential Transition Loans | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	863,038	451,682	859,023	318,998
Transfers:
Transfers out of Level 3		0	0	0
Computershare Acquisition (Note 3)				0
Gains (Losses) Included in Net Income:
Servicing revenue, net	0	0	0	0
Other income (loss)	2,922	4,660	5,805	9,888
Purchases, Issuance and Repayments:
Issuance	0	407,700	0	858,828
Repayments	0	0	0	(324,062)
Other	566	(1,662)	1,698	(1,272)
Ending balance	866,526	862,380	866,526	862,380
MSR Financing Liability | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	60,940	116,142	101,088	0
Transfers:
Transfers out of Level 3		0	0	0
Computershare Acquisition (Note 3)				125,168
Gains (Losses) Included in Net Income:
Servicing revenue, net	8,094	(8,618)	2,396	(17,644)
Other income (loss)	0	0	0	0
Purchases, Issuance and Repayments:
Issuance	0	0	0	0
Repayments	0	0	(34,450)	0
Other	0	0	0	0
Ending balance	69,034	107,524	69,034	107,524
Notes Receivable Financing Liability | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	381,128	352,683	377,227	0
Transfers:
Transfers out of Level 3		20,359	0	373,042
Computershare Acquisition (Note 3)				0
Gains (Losses) Included in Net Income:
Servicing revenue, net	0	0	0	0
Other income (loss)	(689)	0	3,212	0
Purchases, Issuance and Repayments:
Issuance	0	0	0	0
Repayments	0	0	0	0
Other	0	0	0	0
Ending balance	380,439	$ 373,042	380,439	$ 373,042
RTL Financing Liability | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0		0
Transfers:
Transfers out of Level 3			0
Gains (Losses) Included in Net Income:
Servicing revenue, net	0		0
Other income (loss)	0		0
Purchases, Issuance and Repayments:
Issuance	88,422		88,422
Repayments	(705)		(705)
Other	0		0
Ending balance	$ 87,717		$ 87,717