Debt Obligations, Net - Schedule of Debt Obligations, Net (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026 USD ($) facility	Dec. 31, 2025 USD ($) facility
Debt Instrument [Line Items]
Principal Amount	$ 4,887,644	$ 4,822,478
Carrying value of collateral	5,025,490	4,878,915
Carrying Value
Debt Instrument [Line Items]
Carrying Value	4,867,368	4,799,382
Debt issuance costs	$ 20,000	$ 23,000
Short-Term Facilities: | Residential consumer loan warehouse facilities | Facilities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	9	8
Principal Amount	$ 2,854,214	$ 2,798,725
Facility Capacity	$ 4,700,000	$ 3,554,960
Weighted Average Interest Rate	5.43%	5.52%
Carrying value of collateral	$ 3,050,559	$ 3,066,067
Short-Term Facilities: | Residential consumer loan warehouse facilities | Facilities | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 2,854,215	$ 2,798,725
Short-Term Facilities: | Residential investor loan warehouse facilities | Facilities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	4	4
Principal Amount	$ 104,760	$ 157,999
Facility Capacity	$ 725,000	$ 825,000
Weighted Average Interest Rate	6.90%	7.22%
Carrying value of collateral	$ 119,870	$ 159,074
Short-Term Facilities: | Residential investor loan warehouse facilities | Facilities | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 104,443	$ 157,571
Short-Term Facilities: | Real estate securities repurchase facilities | Facilities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	2	4
Principal Amount	$ 71,623	$ 30,867
Facility Capacity	$ 0	$ 0
Weighted Average Interest Rate	4.70%	5.20%
Carrying value of collateral	$ 91,096	$ 40,568
Short-Term Facilities: | Real estate securities repurchase facilities | Facilities | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 71,623	$ 30,867
Short-Term Facilities: | Real estate securities repurchase facilities IO | Facilities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 32,838	$ 0
Facility Capacity	$ 75,000	$ 75,000
Weighted Average Interest Rate	6.68%	6.87%
Carrying value of collateral	$ 45,106	$ 0
Short-Term Facilities: | Real estate securities repurchase facilities IO | Facilities | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 32,838	$ 0
Short-Term Facilities: | Residential MSR warehouse facility | Facilities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 114,457	$ 95,862
Facility Capacity	$ 125,000	$ 125,000
Weighted Average Interest Rate	6.92%	7.12%
Carrying value of collateral	$ 263,286	$ 194,228
Short-Term Facilities: | Residential MSR warehouse facility | Facilities | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 114,457	$ 95,862
Short-Term Facilities: | HEI warehouse facility | Facilities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 43,073	$ 43,496
Facility Capacity	$ 150,000	$ 150,000
Weighted Average Interest Rate	8.17%	8.29%
Carrying value of collateral	$ 99,351	$ 98,308
Short-Term Facilities: | HEI warehouse facility | Facilities | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 43,073	$ 43,496
Recourse Subordinate Securities Financing: | CAFL securities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 262,091	$ 263,063
Weighted Average Interest Rate	7.54%	7.54%
Carrying value of collateral	$ 315,654	$ 330,212
Recourse Subordinate Securities Financing: | CAFL securities | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 261,506	$ 262,374
Recourse Subordinate Securities Financing: | Sequoia and other third-party securities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 85,270	$ 87,477
Weighted Average Interest Rate	7.27%	7.27%
Carrying value of collateral	$ 104,367	$ 109,686
Recourse Subordinate Securities Financing: | Sequoia and other third-party securities | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 85,270	$ 87,477
Long-Term Facilities: | Servicer advance financing
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 135,239	$ 152,660
Facility Capacity	$ 200,000	$ 200,000
Weighted Average Interest Rate	5.63%	5.68%
Carrying value of collateral	$ 219,923	$ 223,677
Long-Term Facilities: | Servicer advance financing | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 134,972	$ 152,293
Long-Term Facilities: | Residential investor loan warehouse facilities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	2	2
Principal Amount	$ 75,793	$ 131,138
Facility Capacity	$ 1,300,000	$ 1,300,000
Weighted Average Interest Rate	6.88%	6.68%
Carrying value of collateral	$ 152,842	$ 205,833
Long-Term Facilities: | Residential investor loan warehouse facilities | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 75,778	$ 131,069
Long-Term Facilities: | Secured revolving financing facility | Facilities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1
Principal Amount	$ 330,883
Facility Capacity	$ 400,000
Weighted Average Interest Rate	8.67%
Carrying value of collateral	$ 563,436
Long-Term Facilities: | Secured revolving financing facility | Facilities | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 325,769
Corporate Debt: | Secured revolving financing facility | Facilities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility		1
Principal Amount		$ 282,883
Facility Capacity		$ 400,000
Weighted Average Interest Rate		8.66%
Carrying value of collateral		$ 451,262
Debt Instrument, Extension Option	1 year
Corporate Debt: | Secured revolving financing facility | Facilities | Carrying Value
Debt Instrument [Line Items]
Carrying Value		$ 276,580
Corporate Debt: | Promissory notes | Facilities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	3	3
Principal Amount	$ 8,359	$ 9,264
Weighted Average Interest Rate	6.91%	7.01%
Corporate Debt: | Promissory notes | Facilities | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 8,359	$ 9,264
Corporate Debt: | Seven Point Seven Five Percentage Convertible Senior Notes | Convertible Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 297,170	$ 297,170
Weighted Average Interest Rate	7.75%	7.75%
Corporate Debt: | Seven Point Seven Five Percentage Convertible Senior Notes | Convertible Debt | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 293,699	$ 292,993
Corporate Debt: | Trust preferred securities and subordinated notes
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	2	2
Principal Amount	$ 139,500	$ 139,500
Weighted Average Interest Rate	6.18%	6.35%
Corporate Debt: | Trust preferred securities and subordinated notes | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 138,917	$ 138,906
Corporate Debt: | 9.125% Senior Notes | Unsecured Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 59,127	$ 59,127
Weighted Average Interest Rate	9.125%	9.125%
Corporate Debt: | 9.125% Senior Notes | Unsecured Debt | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 57,561	$ 57,444
Corporate Debt: | 9.0% Senior Notes | Unsecured Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 84,015	$ 84,015
Weighted Average Interest Rate	9.00%	9.00%
Corporate Debt: | 9.0% Senior Notes | Unsecured Debt | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 81,782	$ 81,647
Corporate Debt: | 9.125% Senior Notes | Unsecured Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 89,232	$ 89,232
Weighted Average Interest Rate	9.125%	9.125%
Corporate Debt: | 9.125% Senior Notes | Unsecured Debt | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 86,429	$ 86,270
Corporate Debt: | 9.5% Senior Notes | Unsecured Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 100,000	$ 100,000
Weighted Average Interest Rate	9.50%	9.50%
Corporate Debt: | 9.5% Senior Notes | Unsecured Debt | Carrying Value
Debt Instrument [Line Items]
Carrying Value	$ 96,677	$ 96,544