Long-Term Debt - Note Payable (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) Lender	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
During the period:
Unpaid principal balance	$ 7,138,415,000		$ 7,138,415,000
Carrying value:
Notes payable	1,325,716,000		1,325,716,000		$ 2,048,972,000
Servicing advances, net	396,006,000		396,006,000		568,512,000
Mortgage servicing rights, at fair value	9,653,942,000		9,653,942,000		8,744,528,000
Other assets	742,395,000		$ 742,395,000		770,081,000
Notes payable
Number Of Lenders | Lender			2
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]			us-gaap:SecuredOvernightFinancingRateSofrMember
Asset Pledged as Collateral without Right
Carrying value:
Servicing advances, net	261,752,000		$ 261,752,000		357,939,000
Mortgage servicing rights, at fair value	$ 9,440,264,000		$ 9,440,264,000		$ 8,609,388,000
Assets, Pledging Purpose [Extensible Enumeration]	Notes payable		Notes payable		Notes payable
Other assets	$ 11,848,000		$ 11,848,000		$ 16,697,000
Asset Pledged as Collateral without Right | Mortgage servicing rights
Carrying value:
Assets, Pledging Purpose [Extensible Enumeration]	Notes payable		Notes payable		Notes payable
Asset Pledged as Collateral without Right | Deposits.
Carrying value:
Other assets	$ 11,848,000		$ 11,848,000		$ 16,697,000
Asset Pledged as Collateral without Right | Deposits. | Deposits
Carrying value:
Other assets	11,848,000		11,848,000		16,697,000
Note Payable
During the period:
Average balance	$ 1,393,315,000	$ 1,730,000,000	$ 1,649,964,000	$ 1,850,621,000
Weighted-average interest rate (as a percent)	7.45%	8.86%	7.72%	8.88%
Total interest expense	$ 26,417,000	$ 39,265,000	$ 98,738,000	$ 125,203,000
Carrying value:
Unpaid principal balance	1,330,000,000		1,330,000,000		2,055,000,000
Unamortized debt issuance costs	(4,284,000)		(4,284,000)		(6,028,000)
Notes payable	$ 1,325,716,000		$ 1,325,716,000		$ 2,048,972,000
Weighted-average interest rate (as a percent)	7.11%		7.11%		7.81%
Amortization of Debt Issuance Costs	$ 249,000	726,000	$ 3,400,000	2,200,000
Notes payable
Maximum loan amount	1,330,000,000		1,330,000,000
Note Payable | Asset Pledged as Collateral without Right | Servicing advances
Carrying value:
Servicing advances, net	261,752,000		261,752,000		$ 357,939,000
Note Payable | Asset Pledged as Collateral without Right | Mortgage servicing rights
Carrying value:
Mortgage servicing rights, at fair value	$ 9,440,264,000		$ 9,440,264,000		$ 8,609,388,000
Assets, Pledging Purpose [Extensible Enumeration]	Notes payable		Notes payable		Notes payable
Note Payable expiring 2024
Notes payable
Maximum loan amount	$ 1,100,000,000		$ 1,100,000,000
Committed amount of debt instrument	1,000,000,000		1,000,000,000
Notes Payable Term Loan 2024-GT1
Notes payable
Maximum loan amount	425,000,000		$ 425,000,000
Interest rate spread			3.20%
Notes Payable Term Loan 2025-GT1
Notes payable
Maximum loan amount	300,000,000		$ 300,000,000
Interest rate spread			2.45%
Notes Payable Term Loan 2023-GT1
Notes payable
Maximum loan amount	480,000,000		$ 480,000,000
Interest rate spread			3.00%
Notes Payable Term Loan 2023-GT2
Notes payable
Maximum loan amount	125,000,000		$ 125,000,000
Interest rate spread			3.00%
Unsecured Senior Note
During the period:
Average balance	4,603,261,000	3,200,000,000	$ 4,173,443,000	2,860,766,000
Total interest expense	$ 78,014,000	$ 51,147,000	$ 208,308,000	$ 133,947,000
Weighted-average interest rate (as a percent)	6.56%	6.15%	6.42%	6.03%
Unpaid principal balance	$ 4,900,000,000		$ 4,900,000,000		$ 3,200,000,000
Unamortized debt issuance costs and premiums	(70,887,000)		(70,887,000)		(35,968,000)
Debt Instrument Unamortized Premium And Debt Issuance Costs Net	$ 4,829,113,000		$ 4,829,113,000		$ 3,164,032,000
Weighted average interest rate (as a percent)	6.58%		6.58%		6.15%
Carrying value:
Amortization of Debt Issuance Costs	$ 2,500,000	$ 1,800,000	$ 7,400,000	$ 4,700,000
Notes payable
Maximum loan amount	4,900,000,000		$ 4,900,000,000
Redemption rate (as a percent)			100.00%
Unsecured Senior Note | Before October 15, 2022 with up to 40% principal redeemed
Notes payable
Redemption rate (as a percent)			40.00%
Unsecured Senior Notes Due February 2029
Notes payable
Maximum loan amount	650,000,000		$ 650,000,000
Interest rate spread			4.25%
Unsecured Senior Notes Due September 2031
Notes payable
Maximum loan amount	500,000,000		$ 500,000,000
Interest rate spread			5.75%
Unsecured Senior Notes Due December 2029
Notes payable
Maximum loan amount	750,000,000		$ 750,000,000
Interest rate spread			7.875%
Unsecured Senior Notes Due November 2030
Notes payable
Maximum loan amount	650,000,000		$ 650,000,000
Interest rate spread			7.125%
Unsecured Senior Notes Due February 2033
Notes payable
Maximum loan amount	850,000,000		$ 850,000,000
Interest rate spread			6.875%
Unsecured Senior Notes Due May 2032
Notes payable
Maximum loan amount	850,000,000		$ 850,000,000
Interest rate spread			6.875%
Unsecured Senior Notes Due February 2034
Notes payable
Maximum loan amount	650,000,000		$ 650,000,000
Interest rate spread			6.75%
Loan and Security Agreement
Carrying value:
Unpaid principal balance					$ 325,000,000
Term Loan Notes Payable
Carrying value:
Unpaid principal balance	$ 1,330,000,000		$ 1,330,000,000		$ 1,730,000,000