DEBT OBLIGATIONS - Carrying Value (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2025 USD ($)
Debt Instrument [Roll Forward]
Beginning balance	$ 31,269,457
Ending balance	29,713,914
Servicer Advances
Debt Instrument [Roll Forward]
Beginning balance	3,110,437
Ending balance	2,784,270
MSRs
Debt Instrument [Roll Forward]
Beginning balance	5,838,250
Ending balance	5,706,822
Government and Government-Backed and Other Securities
Debt Instrument [Roll Forward]
Beginning balance	10,527,433
Ending balance	9,572,284
Residential mortgage loans, residential transition loans and SFR
Debt Instrument [Roll Forward]
Beginning balance	6,605,267
Ending balance	6,257,763
Consumer Loans
Debt Instrument [Roll Forward]
Beginning balance	564,791
Ending balance	381,654
SFR Properties and Commercial
Debt Instrument [Roll Forward]
Beginning balance	795,601
Ending balance	805,390
Residential Transition Loans
Debt Instrument [Roll Forward]
Beginning balance	2,606,330
Ending balance	2,936,624
Asset Management, CLOs and Consolidated Funds
Debt Instrument [Roll Forward]
Beginning balance	1,221,348
Ending balance	1,269,107
Secured Financing Agreements:
Debt Instrument [Roll Forward]
Beginning balance	16,782,467
Borrowings	66,635,350
Repayments	(67,545,897)
Foreign exchange ("FX") remeasurement	25,827
Capitalized deferred financing costs, net of amortization	31
Ending balance	15,897,778
Secured Financing Agreements: | Servicer Advances
Debt Instrument [Roll Forward]
Borrowings	0
Repayments	0
Foreign exchange ("FX") remeasurement	0
Capitalized deferred financing costs, net of amortization	237
Secured Financing Agreements: | MSRs
Debt Instrument [Roll Forward]
Borrowings	0
Repayments	0
Foreign exchange ("FX") remeasurement	0
Capitalized deferred financing costs, net of amortization	0
Secured Financing Agreements: | Government and Government-Backed and Other Securities
Debt Instrument [Roll Forward]
Borrowings	31,272,394
Repayments	(32,257,543)
Foreign exchange ("FX") remeasurement	0
Capitalized deferred financing costs, net of amortization	0
Secured Financing Agreements: | Residential mortgage loans, residential transition loans and SFR
Debt Instrument [Roll Forward]
Borrowings	33,460,231
Repayments	(33,670,285)
Foreign exchange ("FX") remeasurement	0
Capitalized deferred financing costs, net of amortization	0
Secured Financing Agreements: | Consumer Loans
Debt Instrument [Roll Forward]
Borrowings	0
Repayments	0
Foreign exchange ("FX") remeasurement	0
Capitalized deferred financing costs, net of amortization	0
Secured Financing Agreements: | SFR Properties and Commercial
Debt Instrument [Roll Forward]
Borrowings	0
Repayments	(72,918)
Foreign exchange ("FX") remeasurement	0
Capitalized deferred financing costs, net of amortization	0
Secured Financing Agreements: | Residential Transition Loans
Debt Instrument [Roll Forward]
Borrowings	1,843,175
Repayments	(1,516,896)
Foreign exchange ("FX") remeasurement	0
Capitalized deferred financing costs, net of amortization	0
Secured Financing Agreements: | Asset Management, CLOs and Consolidated Funds
Debt Instrument [Roll Forward]
Borrowings	59,550
Repayments	(28,255)
Foreign exchange ("FX") remeasurement	25,827
Capitalized deferred financing costs, net of amortization	(206)
Secured Notes and Bonds Payable:
Debt Instrument [Roll Forward]
Borrowings	3,284,314
Repayments	(3,812,544)
Foreign exchange ("FX") remeasurement	193
Unrealized (gain) loss on notes, fair value	(1,992)
Capitalized deferred financing costs, net of amortization	(3,190)
Secured Notes and Bonds Payable: | Servicer Advances
Debt Instrument [Roll Forward]
Borrowings	1,418,518
Repayments	(1,745,210)
Foreign exchange ("FX") remeasurement	0
Unrealized (gain) loss on notes, fair value	0
Capitalized deferred financing costs, net of amortization	288
Secured Notes and Bonds Payable: | MSRs
Debt Instrument [Roll Forward]
Borrowings	1,750,504
Repayments	(1,872,872)
Foreign exchange ("FX") remeasurement	0
Unrealized (gain) loss on notes, fair value	0
Capitalized deferred financing costs, net of amortization	(9,060)
Secured Notes and Bonds Payable: | Government and Government-Backed and Other Securities
Debt Instrument [Roll Forward]
Borrowings	30,000
Repayments	0
Foreign exchange ("FX") remeasurement	0
Unrealized (gain) loss on notes, fair value	0
Capitalized deferred financing costs, net of amortization	0
Secured Notes and Bonds Payable: | Residential mortgage loans, residential transition loans and SFR
Debt Instrument [Roll Forward]
Borrowings	0
Repayments	0
Foreign exchange ("FX") remeasurement	0
Unrealized (gain) loss on notes, fair value	0
Capitalized deferred financing costs, net of amortization	0
Secured Notes and Bonds Payable: | Consumer Loans
Debt Instrument [Roll Forward]
Borrowings	0
Repayments	(181,737)
Foreign exchange ("FX") remeasurement	0
Unrealized (gain) loss on notes, fair value	(1,992)
Capitalized deferred financing costs, net of amortization	592
Secured Notes and Bonds Payable: | SFR Properties and Commercial
Debt Instrument [Roll Forward]
Borrowings	79,119
Repayments	(663)
Foreign exchange ("FX") remeasurement	0
Unrealized (gain) loss on notes, fair value	0
Capitalized deferred financing costs, net of amortization	4,251
Secured Notes and Bonds Payable: | Residential Transition Loans
Debt Instrument [Roll Forward]
Borrowings	0
Repayments	0
Foreign exchange ("FX") remeasurement	0
Unrealized (gain) loss on notes, fair value	0
Capitalized deferred financing costs, net of amortization	0
Secured Notes and Bonds Payable: | Asset Management, CLOs and Consolidated Funds
Debt Instrument [Roll Forward]
Borrowings	6,173
Repayments	(12,062)
Foreign exchange ("FX") remeasurement	193
Unrealized (gain) loss on notes, fair value	0
Capitalized deferred financing costs, net of amortization	739
Liabilities of Consolidated Funds
Debt Instrument [Roll Forward]
Beginning balance	4,188,915
Repayments	(182,456)
Unrealized (gain) loss on notes, fair value	43,689
Capitalized deferred financing costs, net of amortization	1,132
Ending balance	4,051,279
Liabilities of Consolidated Funds | Servicer Advances
Debt Instrument [Roll Forward]
Repayments	0
Unrealized (gain) loss on notes, fair value	0
Capitalized deferred financing costs, net of amortization	0
Liabilities of Consolidated Funds | MSRs
Debt Instrument [Roll Forward]
Repayments	0
Unrealized (gain) loss on notes, fair value	0
Capitalized deferred financing costs, net of amortization	0
Liabilities of Consolidated Funds | Government and Government-Backed and Other Securities
Debt Instrument [Roll Forward]
Repayments	0
Unrealized (gain) loss on notes, fair value	0
Capitalized deferred financing costs, net of amortization	0
Liabilities of Consolidated Funds | Residential mortgage loans, residential transition loans and SFR
Debt Instrument [Roll Forward]
Repayments	(182,456)
Unrealized (gain) loss on notes, fair value	45,006
Capitalized deferred financing costs, net of amortization	0
Liabilities of Consolidated Funds | Consumer Loans
Debt Instrument [Roll Forward]
Repayments	0
Unrealized (gain) loss on notes, fair value	0
Capitalized deferred financing costs, net of amortization	0
Liabilities of Consolidated Funds | SFR Properties and Commercial
Debt Instrument [Roll Forward]
Repayments	0
Unrealized (gain) loss on notes, fair value	0
Capitalized deferred financing costs, net of amortization	0
Liabilities of Consolidated Funds | Residential Transition Loans
Debt Instrument [Roll Forward]
Beginning balance	859,023
Repayments	0
Unrealized (gain) loss on notes, fair value	2,883
Capitalized deferred financing costs, net of amortization	1,132
Ending balance	863,038
Liabilities of Consolidated Funds | Asset Management, CLOs and Consolidated Funds
Debt Instrument [Roll Forward]
Repayments	0
Unrealized (gain) loss on notes, fair value	(4,200)
Capitalized deferred financing costs, net of amortization	$ 0