DEBT OBLIGATIONS - Schedule of Debt Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Outstanding Face Amount	$ 31,501,279
Carrying Value	$ 31,269,457	$ 26,076,708	$ 23,452,158
Weighted Average Funding Cost	5.80%
Weighted Average Life (Years)	3 years 7 months 6 days
Interest payable	$ 260,931	166,620
Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	16,784,505
Carrying Value	$ 16,782,467	12,561,283
Weighted Average Funding Cost	5.50%
Weighted Average Life (Years)	6 months
Interest payable	$ 239,400	142,300
Secured Notes And Bonds Payable
Debt Instrument [Line Items]
Outstanding Face Amount	10,353,561
Carrying Value	$ 10,298,075	10,360,188
Weighted Average Funding Cost	6.60%
Weighted Average Life (Years)	1 year 7 months 6 days
Liabilities of Consolidated Funds
Debt Instrument [Line Items]
Outstanding Face Amount	$ 4,363,213
Carrying Value	$ 4,188,915	3,155,237
Weighted Average Funding Cost	5.20%
Weighted Average Life (Years)	20 years 3 months 18 days
Warehouse Credit Facilities-Residential Mortgage Loans | Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	$ 4,235,333
Carrying Value	$ 4,235,333	1,940,038
Weighted Average Funding Cost	5.60%
Weighted Average Life (Years)	8 months 12 days
Warehouse Credit Facilities-Residential Mortgage Loans | Secured Financing Agreements: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	26 years
Outstanding Face	$ 4,676,659
Amortized Cost Basis	4,734,520
Carrying Value	4,691,298
Warehouse Credit Facility- Mortgage Loans Receivable | Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	1,547,307
Carrying Value	$ 1,547,307	1,337,010
Weighted Average Funding Cost	7.10%
Weighted Average Life (Years)	10 months 24 days
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	$ 1,867,607
Amortized Cost Basis	1,872,028
Carrying Value	1,872,028
Agency RMBS or Treasuries | Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	9,782,976
Carrying Value	$ 9,782,976	8,152,469
Weighted Average Funding Cost	5.10%
Weighted Average Life (Years)	2 months 12 days
Agency RMBS or Treasuries | Secured Financing Agreements: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	4 years 3 months 18 days
Outstanding Face	$ 9,920,895
Amortized Cost Basis	9,766,248
Carrying Value	10,117,712
Non-Agency RMBS | Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	744,457
Carrying Value	$ 744,457	610,189
Weighted Average Funding Cost	6.60%
Weighted Average Life (Years)	8 months 12 days
Non-Agency RMBS | Secured Financing Agreements: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	5 years 10 months 24 days
Outstanding Face	$ 15,764,455
Amortized Cost Basis	1,063,159
Carrying Value	1,122,686
Excess MSRs
Debt Instrument [Line Items]
Carrying Value	3,110,437	2,713,933	2,907,300
Excess MSRs | Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	223,241
Carrying Value	$ 222,452	0
Weighted Average Funding Cost	6.90%
Weighted Average Life (Years)	1 year 8 months 12 days
Excess MSRs | Secured Financing Agreements: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	5 years 10 months 24 days
Outstanding Face	$ 53,494,378
Amortized Cost Basis	303,849
Carrying Value	347,652
CLOs | Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	172,239
Carrying Value	$ 170,990	183,947
Weighted Average Funding Cost	5.60%
Weighted Average Life (Years)	9 years 3 months 18 days
CLOs | Secured Financing Agreements: | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	9 years 3 months 18 days
Outstanding Face	$ 173,238
Carrying Value	172,753
CLOs | Secured Notes And Bonds Payable
Debt Instrument [Line Items]
Outstanding Face Amount	18,459
Carrying Value	$ 18,429	30,258
Weighted Average Funding Cost	6.80%
Weighted Average Life (Years)	5 years 6 months
CLOs | Secured Notes And Bonds Payable | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	5 years 6 months
Outstanding Face	$ 21,762
Carrying Value	21,226
SFR properties and commercial | Secured Financing Agreements:
Debt Instrument [Line Items]
Outstanding Face Amount	78,952
Carrying Value	$ 78,952	337,630
Weighted Average Funding Cost	8.00%
Weighted Average Life (Years)	1 year 10 months 24 days
SFR properties and commercial | Secured Financing Agreements: | Collateral
Debt Instrument [Line Items]
Amortized Cost Basis	$ 148,637
Carrying Value	148,637
MSRs | Secured Notes And Bonds Payable
Debt Instrument [Line Items]
Outstanding Face Amount	5,845,839
Carrying Value	$ 5,838,250	4,800,728
Weighted Average Funding Cost	6.80%
Weighted Average Life (Years)	1 year 7 months 6 days
MSRs | Secured Notes And Bonds Payable | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	6 years 4 months 24 days
Outstanding Face	$ 563,546,914
Amortized Cost Basis	7,685,659
Carrying Value	10,018,862
Servicer Advance Investments | Secured Notes And Bonds Payable
Debt Instrument [Line Items]
Outstanding Face Amount	258,183
Carrying Value	$ 258,183	459,564
Weighted Average Funding Cost	6.20%
Weighted Average Life (Years)	1 year 2 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	$ 298,945
Amortized Cost Basis	327,471
Carrying Value	339,646
Servicer Advances | Secured Notes And Bonds Payable
Debt Instrument [Line Items]
Outstanding Face Amount	2,630,428
Carrying Value	$ 2,629,802	2,254,369
Weighted Average Funding Cost	7.00%
Weighted Average Life (Years)	1 year 2 months 12 days
Face amount of variable rate debt	$ 1,868,700
Face amount of fixed rate debt	$ 1,020,000
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)	7 months 6 days
Outstanding Face	$ 3,038,170
Amortized Cost Basis	3,026,989
Carrying Value	3,026,989
Residential Mortgage Loans | Secured Notes And Bonds Payable
Debt Instrument [Line Items]
Outstanding Face Amount	0
Carrying Value	$ 0	650,000
Weighted Average Funding Cost	0.00%
Residential Mortgage Loans | Secured Notes And Bonds Payable | Collateral
Debt Instrument [Line Items]
Outstanding Face	$ 0
Amortized Cost Basis	0
Carrying Value	0
Residential Mortgage Loans | Liabilities of Consolidated Funds
Debt Instrument [Line Items]
Outstanding Face Amount	2,540,874
Carrying Value	$ 2,369,934	2,618,082
Weighted Average Funding Cost	4.60%
Weighted Average Life (Years)	25 years 9 months 18 days
Residential Mortgage Loans | Liabilities of Consolidated Funds | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	25 years 9 months 18 days
Outstanding Face	$ 2,966,605
Carrying Value	2,791,027
Consumer Loans
Debt Instrument [Line Items]
Carrying Value	564,791	1,106,974	299,498
Consumer Loans | Secured Notes And Bonds Payable
Debt Instrument [Line Items]
Outstanding Face Amount	585,034
Carrying Value	$ 564,791	1,106,974
Weighted Average Funding Cost	5.30%
Weighted Average Life (Years)	3 years 6 months
Consumer Loans | Secured Notes And Bonds Payable | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	1 year 8 months 12 days
Outstanding Face	$ 767,623
Amortized Cost Basis	749,539
Carrying Value	665,565
SFR Properties
Debt Instrument [Line Items]
Carrying Value	795,601	1,126,804	822,372
SFR Properties | Secured Notes And Bonds Payable
Debt Instrument [Line Items]
Outstanding Face Amount	740,618
Carrying Value	$ 716,649	789,174
Weighted Average Funding Cost	4.20%
Weighted Average Life (Years)	2 years 3 months 18 days
SFR Properties | Secured Notes And Bonds Payable | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	3.50%
SFR Properties | Secured Notes And Bonds Payable | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	7.10%
SFR Properties | Secured Notes And Bonds Payable | Collateral
Debt Instrument [Line Items]
Amortized Cost Basis	$ 879,656
Carrying Value	879,656
Residential Transitional Lending
Debt Instrument [Line Items]
Carrying Value	2,606,330	1,856,008	$ 1,733,581
Residential Transitional Lending | 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 6 months
Residential Transitional Lending | Secured Notes And Bonds Payable | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	4 months 24 days
Outstanding Face	$ 226,535
Amortized Cost Basis	226,535
Carrying Value	226,798
Residential Transitional Lending | Liabilities of Consolidated Funds
Debt Instrument [Line Items]
Outstanding Face Amount	861,949
Carrying Value	$ 859,023	318,998
Weighted Average Funding Cost	6.30%
Weighted Average Life (Years)	14 years 4 months 24 days
Residential Transitional Lending | Liabilities of Consolidated Funds | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	9 months 18 days
Outstanding Face	$ 933,823
Carrying Value	962,192
Secured facility - asset management | Secured Notes And Bonds Payable
Debt Instrument [Line Items]
Outstanding Face Amount	75,000
Carrying Value	$ 71,971	69,121
Weighted Average Funding Cost	8.80%
Weighted Average Life (Years)	9 months 18 days
Liabilities of Consolidated Funds | Liabilities of Consolidated Funds
Debt Instrument [Line Items]
Outstanding Face Amount	$ 960,390
Carrying Value	$ 959,958	$ 218,157
Weighted Average Funding Cost	6.00%
Weighted Average Life (Years)	10 years 8 months 12 days
Liabilities of Consolidated Funds | Liabilities of Consolidated Funds | Collateral
Debt Instrument [Line Items]
Weighted Average Life (Years)	4 years
Outstanding Face	$ 1,055,721
Carrying Value	1,096,207
2.5% To 3.7% Agency MSR Secured Note And Bond Payable | Secured Notes And Bonds Payable
Debt Instrument [Line Items]
Outstanding Face Amount	$ 4,600,000
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	3.30%
3.0% To 5.4% Public Notes | Secured Notes And Bonds Payable
Debt Instrument [Line Items]
Outstanding Face Amount	$ 1,300,000
3.0% To 5.4% Public Notes | Secured Notes And Bonds Payable | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	3.00%
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	$ 148,600
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	$ 383,400
Variable interest rate spread	2.40%
Subordinated Notes | Liabilities of Consolidated Funds
Debt Instrument [Line Items]
Face amount of variable rate debt	$ 49,300