Debt Obligations, Net - Schedule of Debt Obligations, Net (Details)	12 Months Ended
	Dec. 31, 2025 USD ($) facility	Dec. 31, 2024 USD ($) facility	Nov. 30, 2025 USD ($)	Oct. 31, 2025 USD ($)	Jan. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)
Debt Instrument [Line Items]
Principal Amount	$ 4,822,478,000	$ 3,482,175,000
Debt instrument, collateral amount	4,878,915,000	3,701,592,000
Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	4,799,382,000	3,462,880,000
Debt issuance costs	$ 23,000,000	$ 20,000,000
Line of Credit
Debt Instrument [Line Items]
Facility Capacity				$ 400,000,000		$ 250,000,000
Short-Term Debt | Residential consumer loan warehouse facilities | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	8	7
Principal Amount	$ 2,798,725,000	$ 956,010,000
Facility Capacity	$ 3,554,960,000	$ 2,175,000,000
Weighted Average Interest Rate	5.52%	6.24%
Debt instrument, collateral amount	$ 3,066,067,000	$ 1,005,926,000
Short-Term Debt | Residential consumer loan warehouse facilities | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 2,798,725,000	$ 956,010,000
Short-Term Debt | Residential investor loan warehouse facilities | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	4	2
Principal Amount	$ 157,999,000	$ 223,975,000
Facility Capacity	$ 825,000,000	$ 800,000,000
Weighted Average Interest Rate	7.22%	7.31%
Debt instrument, collateral amount	$ 159,074,000	$ 300,843,000
Short-Term Debt | Residential investor loan warehouse facilities | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 157,571,000	$ 223,876,000
Short-Term Debt | Real estate securities repurchase facilities | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	4	6
Principal Amount	$ 30,867,000	$ 210,352,000
Facility Capacity	$ 0	$ 0
Weighted Average Interest Rate	5.20%	5.81%
Debt instrument, collateral amount	$ 40,568,000	$ 281,997,000
Short-Term Debt | Real estate securities repurchase facilities | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 30,867,000	$ 210,352,000
Short-Term Debt | Residential MSR warehouse facility | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 95,862,000	$ 58,164,000
Facility Capacity	$ 125,000,000	$ 75,000,000
Weighted Average Interest Rate	7.12%	7.65%
Debt instrument, collateral amount	$ 194,228,000	$ 91,506,000
Short-Term Debt | Residential MSR warehouse facility | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 95,862,000	$ 58,164,000
Short-Term Debt | HEI warehouse facility | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 43,496,000	$ 97,497,000
Facility Capacity	$ 150,000,000	$ 150,000,000
Weighted Average Interest Rate	8.29%	9.00%
Debt instrument, collateral amount	$ 98,308,000	$ 207,097,000
Short-Term Debt | HEI warehouse facility | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 43,496,000	$ 97,497,000
Short-Term Debt | Servicer advance financing | Servicer advance financing
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 152,660,000	$ 159,798,000
Facility Capacity	$ 200,000,000	$ 200,000,000
Weighted Average Interest Rate	5.68%	6.32%
Debt instrument, collateral amount	$ 223,677,000	$ 233,820,000
Short-Term Debt | Servicer advance financing | Servicer advance financing | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 152,293,000	$ 159,031,000
Short-Term Debt | Real Estate Securities Repurchase Facilities IO | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1
Principal Amount	$ 0
Facility Capacity	$ 75,000,000
Weighted Average Interest Rate	6.87%
Debt instrument, collateral amount	$ 0
Short-Term Debt | Real Estate Securities Repurchase Facilities IO | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 0
Subordinate | CAFL securities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 263,063,000	$ 268,240,000
Weighted Average Interest Rate	7.54%	7.54%
Debt instrument, collateral amount	$ 330,212,000	$ 318,106,000
Subordinate | CAFL securities | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 262,374,000	$ 267,140,000
Subordinate | Sequoia And Other Third-Party Securities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1
Principal Amount	$ 87,477,000
Weighted Average Interest Rate	7.27%
Debt instrument, collateral amount	$ 109,686,000
Subordinate | Sequoia And Other Third-Party Securities | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 87,477,000
Long-Term Debt | Residential investor loan warehouse facilities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	2	5
Principal Amount	$ 131,138,000	$ 615,036,000
Facility Capacity	$ 1,300,000,000	$ 1,530,000,000
Weighted Average Interest Rate	6.68%	7.83%
Debt instrument, collateral amount	$ 205,833,000	$ 889,901,000
Long-Term Debt | Residential investor loan warehouse facilities | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 131,069,000	$ 613,129,000
Corporate Debt Securities | Secured revolving financing facility | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 282,883,000	$ 225,000,000
Facility Capacity	$ 400,000,000	$ 250,000,000
Weighted Average Interest Rate	8.66%	9.50%
Debt instrument, collateral amount	$ 451,262,000	$ 372,396,000
Debt instrument, extension option	1 year
Corporate Debt Securities | Secured revolving financing facility | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 276,580,000	$ 220,234,000
Corporate Debt Securities | Promissory notes | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	3	3
Principal Amount	$ 9,264,000	$ 12,859,000
Weighted Average Interest Rate	7.01%	7.06%
Corporate Debt Securities | Promissory notes | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 9,264,000	$ 12,859,000
Corporate Debt Securities | 5.75% Exchangeable Senior Notes | Exchangeable Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility		1
Principal Amount		$ 123,574,000
Weighted Average Interest Rate		5.75%
Corporate Debt Securities | 5.75% Exchangeable Senior Notes | Exchangeable Debt | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance		$ 123,087,000
Corporate Debt Securities | 7.75% Convertible Senior Notes | Convertible Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 297,170,000	$ 247,170,000
Weighted Average Interest Rate	7.75%	7.75%
Corporate Debt Securities | 7.75% Convertible Senior Notes | Convertible Debt | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 292,993,000	$ 242,652,000
Corporate Debt Securities | Trust preferred securities and subordinated notes
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	2	2
Principal Amount	$ 139,500,000	$ 139,500,000
Weighted Average Interest Rate	6.35%	7.10%
Corporate Debt Securities | Trust preferred securities and subordinated notes | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 138,906,000	$ 138,860,000
Corporate Debt Securities | 9.125% Senior Notes | Unsecured Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 59,127,000	$ 60,000,000			$ 90,000,000
Weighted Average Interest Rate	9.125%	9.125%			9.125%
Corporate Debt Securities | 9.125% Senior Notes | Unsecured Debt | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 57,444,000	$ 57,877,000
Corporate Debt Securities | 9.0% Senior Notes | Unsecured Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 84,015,000	$ 85,000,000
Weighted Average Interest Rate	9.00%	9.00%
Corporate Debt Securities | 9.0% Senior Notes | Unsecured Debt | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 81,647,000	$ 82,112,000
Corporate Debt Securities | 9.125% Senior Notes | Unsecured Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1
Principal Amount	$ 89,232,000
Weighted Average Interest Rate	9.125%
Corporate Debt Securities | 9.125% Senior Notes | Unsecured Debt | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 86,270,000
Corporate Debt Securities | 9.5% Senior Notes | Unsecured Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1
Principal Amount	$ 100,000,000		$ 100,000,000
Weighted Average Interest Rate	9.50%		9.50%
Corporate Debt Securities | 9.5% Senior Notes | Unsecured Debt | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 96,544,000