FAIR VALUE MEASUREMENTS - Financial Assets Measured at Fair Value on a Recurring Basis using Level 3 Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Purchases, Sales and Repayments:
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Realized and unrealized gains (losses), net
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other income (loss), net
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]		Unrealized gain (loss) on available-for-sale securities, net of tax
Recurring Basis
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	$ 14,427,743	$ 13,558,824
Transfers:
Transfers from Level 3	(452,730)	(41,430)
Transfers to Level 3	605,285	22,565
Sculptor Acquisition (Note 3)	699,175	216,229
Gain (Loss) Included in Net Income:
Credit losses on securities	(936)	2,951
Included in servicing revenue	(191,654)	(565,684)
Other factors	32,630	(241)
Instrument-specific credit risk	(16,277)	12,191
Gain (loss) on settlement of investments, net	792	615
Other income (loss), net	(14,245)	69,647
Gains (losses) included in OCI	3,084	13,118
Interest income	110,280	91,626
Purchases, Sales and Repayments:
Purchases, net	2,026,694	2,772,795
Sales and settlement fundings	(438,539)	(933,321)
Proceeds from repayments	(3,722,321)	(3,690,493)
Originations and other	4,287,226	2,898,351
Balance, ending	17,356,207	14,427,743
Recurring Basis | Excess MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	271,150	321,803
Transfers:
Transfers from Level 3	0	0
Transfers to Level 3	0	0
Sculptor Acquisition (Note 3)	(1,032)	0
Gain (Loss) Included in Net Income:
Credit losses on securities	0	0
Included in servicing revenue	0	0
Other factors	12,437	(12,712)
Instrument-specific credit risk	0	0
Gain (loss) on settlement of investments, net	(656)	615
Other income (loss), net	0	(348)
Gains (losses) included in OCI	0	0
Interest income	29,815	18,310
Purchases, Sales and Repayments:
Purchases, net	122,887	0
Sales and settlement fundings	(499)	(4,212)
Proceeds from repayments	(64,940)	(52,306)
Originations and other	0	0
Balance, ending	369,162	271,150
Recurring Basis | MSRs And MSR Financing Receivables
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	8,405,938	8,889,403
Transfers:
Transfers from Level 3	0	0
Transfers to Level 3	0	0
Sculptor Acquisition (Note 3)	700,207	0
Gain (Loss) Included in Net Income:
Credit losses on securities	0	0
Included in servicing revenue	(191,654)	(565,684)
Other factors	0	0
Instrument-specific credit risk	0	0
Gain (loss) on settlement of investments, net	0	0
Other income (loss), net	0	0
Gains (losses) included in OCI	0	0
Interest income	0	0
Purchases, Sales and Repayments:
Purchases, net	0	0
Sales and settlement fundings	11,026	(704,436)
Proceeds from repayments	0	0
Originations and other	1,396,154	786,655
Balance, ending	10,321,671	8,405,938
Recurring Basis | Servicer Advances
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	376,881	398,820
Transfers:
Transfers from Level 3	(7,873)	0
Transfers to Level 3	0	0
Sculptor Acquisition (Note 3)	0	0
Gain (Loss) Included in Net Income:
Credit losses on securities	0	0
Included in servicing revenue	0	0
Other factors	(2,526)	8,049
Instrument-specific credit risk	0	0
Gain (loss) on settlement of investments, net	0	0
Other income (loss), net	0	0
Gains (losses) included in OCI	0	0
Interest income	24,263	22,180
Purchases, Sales and Repayments:
Purchases, net	781,896	852,015
Sales and settlement fundings	0	0
Proceeds from repayments	(832,995)	(904,183)
Originations and other	0	0
Balance, ending	339,646	376,881
Recurring Basis | non-Agency
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	577,543	614,472
Transfers:
Transfers from Level 3	(7,384)	0
Transfers to Level 3	0	0
Sculptor Acquisition (Note 3)	0	0
Gain (Loss) Included in Net Income:
Credit losses on securities	(936)	2,951
Included in servicing revenue	0	0
Other factors	5,486	0
Instrument-specific credit risk	0	0
Gain (loss) on settlement of investments, net	(137)	0
Other income (loss), net	0	7,798
Gains (losses) included in OCI	8,438	5,466
Interest income	27,750	12,929
Purchases, Sales and Repayments:
Purchases, net	51,536	17,362
Sales and settlement fundings	0	0
Proceeds from repayments	(109,499)	(83,435)
Originations and other	0	0
Balance, ending	552,797	577,543
Recurring Basis | CLOs And Consolidated Funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	226,486	0
Transfers:
Transfers from Level 3	(219,832)	0
Transfers to Level 3	519,496	0
Sculptor Acquisition (Note 3)	0	216,229
Gain (Loss) Included in Net Income:
Credit losses on securities	0	0
Included in servicing revenue	0	0
Other factors	2,888	0
Instrument-specific credit risk	0	0
Gain (loss) on settlement of investments, net	1,585	0
Other income (loss), net	2,382	2,852
Gains (losses) included in OCI	(5,354)	7,652
Interest income	0	0
Purchases, Sales and Repayments:
Purchases, net	598,386	471
Sales and settlement fundings	(284,667)	0
Proceeds from repayments	(30,939)	(718)
Originations and other	0	0
Balance, ending	810,431	226,486
Recurring Basis | Residential Mortgage Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	513,381	713,896
Transfers:
Transfers from Level 3	(217,641)	(41,430)
Transfers to Level 3	85,789	22,565
Sculptor Acquisition (Note 3)	0	0
Gain (Loss) Included in Net Income:
Credit losses on securities	0	0
Included in servicing revenue	0	0
Other factors	13,624	3,677
Instrument-specific credit risk	27,151	11,234
Gain (loss) on settlement of investments, net	0	0
Other income (loss), net	10,957	44,694
Gains (losses) included in OCI	0	0
Interest income	0	0
Purchases, Sales and Repayments:
Purchases, net	248,952	38,992
Sales and settlement fundings	(188,490)	(252,183)
Proceeds from repayments	(68,639)	(91,249)
Originations and other	30,642	63,185
Balance, ending	455,726	513,381
Recurring Basis | Consumer Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	1,274,005	363,756
Transfers:
Transfers from Level 3	0	0
Transfers to Level 3	0	0
Sculptor Acquisition (Note 3)	0	0
Gain (Loss) Included in Net Income:
Credit losses on securities	0	0
Included in servicing revenue	0	0
Other factors	(47,950)	(27,158)
Instrument-specific credit risk	(51,977)	957
Gain (loss) on settlement of investments, net	0	0
Other income (loss), net	0	0
Gains (losses) included in OCI	0	0
Interest income	27,914	37,717
Purchases, Sales and Repayments:
Purchases, net	0	1,317,347
Sales and settlement fundings	24,091	27,510
Proceeds from repayments	(560,518)	(446,124)
Originations and other	0	0
Balance, ending	665,565	1,274,005
Recurring Basis | Other Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	549,446	192,646
Transfers:
Transfers from Level 3	0	0
Transfers to Level 3	0	0
Sculptor Acquisition (Note 3)	0	0
Gain (Loss) Included in Net Income:
Credit losses on securities	0	0
Included in servicing revenue	0	0
Other factors	23,091	27,903
Instrument-specific credit risk	0	0
Gain (loss) on settlement of investments, net	0	0
Other income (loss), net	(27,584)	15,018
Gains (losses) included in OCI	0	0
Interest income	538	490
Purchases, Sales and Repayments:
Purchases, net	223,037	399,977
Sales and settlement fundings	0	0
Proceeds from repayments	(67,539)	(86,588)
Originations and other	(47)	0
Balance, ending	700,942	549,446
Recurring Basis | Residential Transitional Lending
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	2,232,913	2,064,028
Transfers:
Transfers from Level 3	0	0
Transfers to Level 3	0	0
Sculptor Acquisition (Note 3)	0	0
Gain (Loss) Included in Net Income:
Credit losses on securities	0	0
Included in servicing revenue	0	0
Other factors	25,580	0
Instrument-specific credit risk	8,549	0
Gain (loss) on settlement of investments, net	0	0
Other income (loss), net	0	(367)
Gains (losses) included in OCI	0	0
Interest income	0	0
Purchases, Sales and Repayments:
Purchases, net	0	146,631
Sales and settlement fundings	0	0
Proceeds from repayments	(1,987,252)	(2,025,890)
Originations and other	2,860,477	2,048,511
Balance, ending	$ 3,140,267	$ 2,232,913