DEBT OBLIGATIONS - Schedule of Debt Obligations (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Outstanding Face Amount	$ 29,904,997
Carrying Value	$ 29,713,914	$ 31,269,457
Weighted Average Funding Cost	5.60%
Weighted Average Life (Years)	3 years 7 months 6 days
Interest payable	$ 199,244	260,931
Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	15,899,785
Carrying Value	$ 15,897,778	16,782,467
Weighted Average Funding Cost	5.20%
Weighted Average Life (Years)	8 months 12 days
Interest payable	$ 184,300	239,400
Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	9,824,595
Carrying Value	$ 9,764,857	10,298,075
Weighted Average Funding Cost	6.50%
Weighted Average Life (Years)	1 year 7 months 6 days
Liabilities of Consolidated Funds
Debt Instrument [Line Items]
Outstanding Face Amount	$ 4,180,617
Carrying Value	$ 4,051,279	4,188,915
Weighted Average Funding Cost	5.10%
Weighted Average Life (Years)	19 years 6 months
Warehouse Credit Facilities-Residential Mortgage Loans | Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	$ 4,025,279
Carrying Value	$ 4,025,279	4,235,333
Weighted Average Funding Cost	5.70%
Weighted Average Life (Years)	7 months 6 days
Warehouse Credit Facilities-Residential Mortgage Loans | Secured Financing Agreements: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	23 years 9 months 18 days
Outstanding Face	$ 4,436,455
Amortized Cost Basis	4,533,953
Carrying Value	4,502,103
Warehouse Credit Facility- Mortgage Loans Receivable | Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	1,873,586
Carrying Value	$ 1,873,586	1,547,307
Weighted Average Funding Cost	6.70%
Weighted Average Life (Years)	1 year 6 months
Warehouse Credit Facility- Mortgage Loans Receivable | Secured Financing Agreements: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	1 year 1 month 6 days
Outstanding Face	$ 2,181,576
Amortized Cost Basis	2,186,402
Carrying Value	2,186,402
Agency RMBS or Treasuries | Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	8,670,898
Carrying Value	$ 8,670,898	9,782,976
Weighted Average Funding Cost	4.60%
Weighted Average Life (Years)	3 months 18 days
Agency RMBS or Treasuries | Secured Financing Agreements: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	7 years 1 month 6 days
Outstanding Face	$ 8,967,430
Amortized Cost Basis	8,788,443
Carrying Value	9,030,840
Non-Agency securities | Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	871,386
Carrying Value	$ 871,386	744,457
Weighted Average Funding Cost	6.00%
Weighted Average Life (Years)	8 months 12 days
Non-Agency securities | Secured Financing Agreements: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	4 years 2 months 12 days
Outstanding Face	$ 14,894,065
Amortized Cost Basis	1,206,506
Carrying Value	1,285,364
Excess MSRs | Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	223,241
Carrying Value	$ 222,689	222,452
Weighted Average Funding Cost	6.70%
Weighted Average Life (Years)	1 year 2 months 12 days
Excess MSRs | Secured Financing Agreements: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	6 years
Outstanding Face	$ 50,719,526
Amortized Cost Basis	282,966
Carrying Value	325,337
CLOs | Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	229,361
Carrying Value	$ 227,906	170,990
Weighted Average Funding Cost	4.40%
Weighted Average Life (Years)	8 years 2 months 12 days
CLOs | Secured Financing Agreements: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	8 years 2 months 12 days
Outstanding Face	$ 229,949
Carrying Value	229,532
CLOs | Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	11,837
Carrying Value	$ 11,810	18,429
Weighted Average Funding Cost	6.10%
Weighted Average Life (Years)	5 years
CLOs | Secured Notes and Bonds Payable: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	5 years
Outstanding Face	$ 15,373
Carrying Value	14,391
SFR properties and commercial | Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	6,034
Carrying Value	$ 6,034	78,952
Weighted Average Funding Cost	6.80%
Weighted Average Life (Years)	1 year 6 months
SFR properties and commercial | Secured Financing Agreements: | Collateral
Debt Instrument [Line Items]
Amortized Cost Basis	$ 10,785
Carrying Value	10,785
MSRs | Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	5,723,470
Carrying Value	$ 5,706,822	5,838,250
Weighted Average Funding Cost	6.80%
Weighted Average Life (Years)	1 year 9 months 18 days
MSRs | Secured Notes and Bonds Payable: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	6 years 4 months 24 days
Outstanding Face	$ 571,546,048
Amortized Cost Basis	8,182,037
Carrying Value	10,135,402
Servicer Advance Investments | Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	240,656
Carrying Value	$ 240,656	258,183
Weighted Average Funding Cost	6.20%
Weighted Average Life (Years)	8 months 12 days
Servicer Advance Investments | Secured Notes and Bonds Payable: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	7 years 7 months 6 days
Outstanding Face	$ 276,702
Amortized Cost Basis	302,338
Carrying Value	312,986
Servicer Advances
Debt Instrument [Line Items]
Carrying Value	2,784,270	3,110,437
Servicer Advances | Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	2,321,262
Carrying Value	$ 2,320,925	2,629,802
Weighted Average Funding Cost	6.80%
Weighted Average Life (Years)	8 months 12 days
Face amount of variable rate debt	$ 1,500,000
Face amount of fixed rate debt	$ 1,000,000
Servicer Advances | Secured Notes and Bonds Payable: | Minimum
Debt Instrument [Line Items]
Variable interest rate spread	1.60%
Interest rate of fixed interest debt	3.90%
Servicer Advances | Secured Notes and Bonds Payable: | Maximum
Debt Instrument [Line Items]
Variable interest rate spread	3.00%
Interest rate of fixed interest debt	5.70%
Servicer Advances | Secured Notes and Bonds Payable: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	8 months 12 days
Outstanding Face	$ 2,706,174
Amortized Cost Basis	2,684,416
Carrying Value	2,684,416
Consumer Loans
Debt Instrument [Line Items]
Carrying Value	381,654	564,791
Consumer Loans | Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	403,296
Carrying Value	$ 381,654	564,791
Weighted Average Funding Cost	4.70%
Weighted Average Life (Years)	3 years 3 months 18 days
Consumer Loans | Secured Notes and Bonds Payable: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	1 year 8 months 12 days
Outstanding Face	$ 580,301
Amortized Cost Basis	568,925
Carrying Value	465,231
SFR Properties and Commercial
Debt Instrument [Line Items]
Carrying Value	805,390	795,601
SFR Properties and Commercial | Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	819,074
Carrying Value	$ 799,356	716,649
Weighted Average Funding Cost	4.30%
Weighted Average Life (Years)	2 years 1 month 6 days
SFR Properties and Commercial | Secured Notes and Bonds Payable: | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	3.50%
SFR Properties and Commercial | Secured Notes and Bonds Payable: | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	6.20%
SFR Properties and Commercial | Secured Notes and Bonds Payable: | Collateral
Debt Instrument [Line Items]
Amortized Cost Basis	$ 991,475
Carrying Value	991,475
Residential Transition Loans
Debt Instrument [Line Items]
Carrying Value	2,936,624	2,606,330
Residential Transition Loans | Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	200,000
Carrying Value	$ 200,000	200,000
Weighted Average Funding Cost	5.80%
Weighted Average Life (Years)	1 year
Interest rate, stated percentage	5.80%
Residential Transition Loans | Secured Notes and Bonds Payable: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	6 months
Outstanding Face	$ 230,554
Amortized Cost Basis	230,554
Carrying Value	231,693
Residential Transition Loans | Liabilities of Consolidated Funds
Debt Instrument [Line Items]
Outstanding Face Amount	861,949
Carrying Value	$ 863,038	859,023
Weighted Average Funding Cost	6.20%
Weighted Average Life (Years)	13 years 10 months 24 days
Residential Transition Loans | Liabilities of Consolidated Funds | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	10 months 24 days
Outstanding Face	$ 943,271
Carrying Value	967,461
Secured facility - asset management | Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	75,000
Carrying Value	$ 73,634	71,971
Weighted Average Funding Cost	8.80%
Weighted Average Life (Years)	3 months 18 days
Interest rate, stated percentage	8.80%
Other investments | Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	$ 30,000
Carrying Value	$ 30,000	0
Weighted Average Funding Cost	6.60%
Weighted Average Life (Years)	4 years 7 months 6 days
Residential Mortgage Loans | Liabilities of Consolidated Funds
Debt Instrument [Line Items]
Outstanding Face Amount	$ 2,358,418
Carrying Value	$ 2,232,484	2,369,934
Weighted Average Funding Cost	4.40%
Weighted Average Life (Years)	25 years 3 months 18 days
Residential Mortgage Loans | Liabilities of Consolidated Funds | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	25 years 3 months 18 days
Outstanding Face	$ 2,769,184
Carrying Value	2,637,931
Liabilities of Consolidated Funds | Liabilities of Consolidated Funds
Debt Instrument [Line Items]
Outstanding Face Amount	960,250
Carrying Value	$ 955,757	$ 959,958
Weighted Average Funding Cost	5.80%
Weighted Average Life (Years)	10 years 2 months 12 days
Liabilities of Consolidated Funds | Liabilities of Consolidated Funds | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	5 years
Outstanding Face	$ 1,041,106
Carrying Value	1,073,302
2.5% To 3.7% Agency MSR Secured Note And Bond Payable | Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	$ 4,000,000
2.5% To 3.7% Agency MSR Secured Note And Bond Payable | Secured Notes and Bonds Payable: | Minimum
Debt Instrument [Line Items]
Variable interest rate spread	2.50%
2.5% To 3.7% Agency MSR Secured Note And Bond Payable | Secured Notes and Bonds Payable: | Maximum
Debt Instrument [Line Items]
Variable interest rate spread	3.00%
3.0% To 5.4% Public Notes | Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	$ 1,700,000
3.0% To 5.4% Public Notes | Secured Notes and Bonds Payable: | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	3.10%
3.0% To 5.4% Public Notes | Secured Notes and Bonds Payable: | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	7.40%
Consumer Loan, UPB Class A | Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	$ 125,600
Interest rate, stated percentage	2.00%
Consumer Loan, UPB Class B | Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	$ 53,000
Interest rate, stated percentage	2.70%
Consumer Loan, Marcus | Secured Notes and Bonds Payable:
Debt Instrument [Line Items]
Outstanding Face Amount	$ 224,700
Variable interest rate spread	2.40%
Subordinated Notes | Liabilities of Consolidated Funds
Debt Instrument [Line Items]
Face amount of variable rate debt	$ 32,000