Debt Obligations, Net - Schedule of Debt Obligations, Net (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) facility	Dec. 31, 2023 USD ($) facility	Mar. 31, 2024 USD ($)
Debt Instrument [Line Items]
Principal Amount	$ 3,482,175,000	$ 3,249,158,000
Carrying Value of Collateral	3,701,592,000	3,405,564,000
Line of Credit
Debt Instrument [Line Items]
Facility Capacity			$ 250,000,000
Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	3,462,880,000	3,239,123,000
Debt issuance costs	$ 20,000,000	$ 11,000,000
Short-Term Debt | Residential consumer loan warehouse facilities | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	7	4
Principal Amount	$ 956,010,000	$ 796,537,000
Facility Capacity	$ 2,175,000,000	$ 1,150,000,000
Weighted Average Interest Rate	6.24%	7.27%
Carrying Value of Collateral	$ 1,005,926,000	$ 907,742,000
Short-Term Debt | Residential consumer loan warehouse facilities | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 956,010,000	$ 796,537,000
Short-Term Debt | Residential investor loan warehouse facilities | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	2	2
Principal Amount	$ 223,975,000	$ 71,851,000
Facility Capacity	$ 800,000,000	$ 455,000,000
Weighted Average Interest Rate	7.31%	8.14%
Carrying Value of Collateral	$ 300,843,000	$ 95,225,000
Short-Term Debt | Residential investor loan warehouse facilities | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 223,876,000	$ 71,719,000
Short-Term Debt | Real estate securities repurchase facilities | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	6	3
Principal Amount	$ 210,352,000	$ 82,622,000
Facility Capacity	$ 0	$ 0
Weighted Average Interest Rate	5.81%	7.01%
Carrying Value of Collateral	$ 281,997,000	$ 122,110,000
Short-Term Debt | Real estate securities repurchase facilities | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 210,352,000	$ 82,622,000
Short-Term Debt | Residential MSR warehouse facility | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 58,164,000	$ 47,858,000
Facility Capacity	$ 75,000,000	$ 50,000,000
Weighted Average Interest Rate	7.65%	8.60%
Carrying Value of Collateral	$ 91,506,000	$ 76,560,000
Short-Term Debt | Residential MSR warehouse facility | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 58,164,000	$ 47,858,000
Short-Term Debt | HEI warehouse facility | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 97,497,000	$ 122,659,000
Facility Capacity	$ 150,000,000	$ 150,000,000
Weighted Average Interest Rate	9.00%	9.89%
Carrying Value of Collateral	$ 207,097,000	$ 237,973,000
Short-Term Debt | HEI warehouse facility | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 97,497,000	$ 122,659,000
Short-Term Debt | Servicer advance financing | Servicer advance financing
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 159,798,000	$ 154,369,000
Facility Capacity	$ 200,000,000	$ 240,000,000
Weighted Average Interest Rate	6.32%	7.71%
Carrying Value of Collateral	$ 233,820,000	$ 225,345,000
Short-Term Debt | Servicer advance financing | Servicer advance financing | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 159,031,000	$ 153,653,000
Subordinate | Sequoia securities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility		1
Principal Amount		$ 124,552,000
Weighted Average Interest Rate		7.21%
Carrying Value of Collateral		$ 175,096,000
Subordinate | Sequoia securities | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance		$ 124,552,000
Subordinate | CAFL Securities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 268,240,000	$ 101,228,000
Weighted Average Interest Rate	7.54%	5.71%
Carrying Value of Collateral	$ 318,106,000	$ 124,793,000
Subordinate | CAFL Securities | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 267,140,000	$ 101,228,000
Subordinate | CAFL Securities 2
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility		1
Principal Amount		$ 57,982,000
Weighted Average Interest Rate		4.75%
Carrying Value of Collateral		$ 112,813,000
Subordinate | CAFL Securities 2 | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance		$ 57,982,000
Long-Term Debt | Residential investor loan warehouse facilities
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	5	6
Principal Amount	$ 615,036,000	$ 1,023,384,000
Facility Capacity	$ 1,530,000,000	$ 2,350,000,000
Weighted Average Interest Rate	7.83%	8.14%
Carrying Value of Collateral	$ 889,901,000	$ 1,327,907,000
Long-Term Debt | Residential investor loan warehouse facilities | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 613,129,000	$ 1,021,708,000
Corporate Debt Securities | Promissory Notes | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	3	3
Principal Amount	$ 12,859,000	$ 16,063,000
Facility Capacity	$ 0
Weighted Average Interest Rate	7.06%	6.97%
Carrying Value of Collateral	$ 0	$ 0
Corporate Debt Securities | Promissory Notes | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 12,859,000	$ 16,064,000
Corporate Debt Securities | Corporate Secured Revolving Financing Facility | Line of Credit
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1
Principal Amount	$ 225,000,000
Facility Capacity			$ 250,000,000
Weighted Average Interest Rate	9.50%
Carrying Value of Collateral	$ 372,396,000
Corporate Debt Securities | Corporate Secured Revolving Financing Facility | Line of Credit | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 220,234,000
Corporate Debt Securities | 5.625% Convertible Senior Notes | Convertible Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility		1
Principal Amount		$ 142,977,000
Weighted Average Interest Rate		5.625%
Corporate Debt Securities | 5.625% Convertible Senior Notes | Convertible Debt | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance		$ 142,558,000
Corporate Debt Securities | 5.75% Exchangeable Senior Notes | Exchangeable Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 123,574,000	$ 156,666,000
Weighted Average Interest Rate	5.75%	5.75%
Corporate Debt Securities | 5.75% Exchangeable Senior Notes | Exchangeable Debt | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 123,087,000	$ 155,138,000
Corporate Debt Securities | 7.75% Convertible Senior Notes | Convertible Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1	1
Principal Amount	$ 247,170,000	$ 210,910,000
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	$ 242,652,000	$ 206,032,000
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	7.10%	7.90%
Corporate Debt Securities | Trust preferred securities and subordinated notes | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 138,860,000	$ 138,813,000
Corporate Debt Securities | 9.125% Senior Notes | Unsecured Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1
Principal Amount	$ 60,000,000
Weighted Average Interest Rate	9.125%
Corporate Debt Securities | 9.125% Senior Notes | Unsecured Debt | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 57,877,000
Corporate Debt Securities | 9.0% Senior Notes | Unsecured Debt
Debt Instrument [Line Items]
Number of Facilities or Issuances | facility	1
Principal Amount	$ 85,000,000
Weighted Average Interest Rate	9.00%
Corporate Debt Securities | 9.0% Senior Notes | Unsecured Debt | Carrying Value
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 82,112,000