Long-Term Debt - Note Payable (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) Lender	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
During the period:
Unpaid principal balance	$ 7,351,846,000		$ 7,351,846,000
Carrying value:
Notes payable	1,327,143,000		1,327,143,000		$ 2,048,972,000
Servicing advances, net	430,602,000		430,602,000		568,512,000
Mortgage servicing rights, at fair value	9,531,249,000		9,531,249,000		8,744,528,000
Other assets	714,677,000		$ 714,677,000		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	265,118,000		$ 265,118,000		357,939,000
Mortgage servicing rights, at fair value	$ 9,350,647,000		$ 9,350,647,000		$ 8,609,388,000
Assets, Pledging Purpose [Extensible Enumeration]	Notes payable		Notes payable		Notes payable
Other assets	$ 13,124,000		$ 13,124,000		$ 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	$ 13,124,000		$ 13,124,000		$ 16,697,000
Asset Pledged as Collateral without Right | Deposits. | Deposits
Carrying value:
Other assets	13,124,000		13,124,000		16,697,000
Note Payable
During the period:
Average balance	$ 1,698,132,000	$ 1,872,857,000	$ 1,780,415,000	$ 1,911,593,000
Weighted-average interest rate (as a percent)	7.81%	8.85%	7.83%	8.89%
Total interest expense	$ 35,743,000	$ 41,932,000	$ 72,321,000	$ 85,938,000
Carrying value:
Unpaid principal balance	1,330,000,000		1,330,000,000		2,055,000,000
Unamortized debt issuance costs	(2,857,000)		(2,857,000)		(6,028,000)
Notes payable	$ 1,327,143,000		$ 1,327,143,000		$ 2,048,972,000
Weighted-average interest rate (as a percent)	7.49%		7.49%		7.81%
Amortization of Debt Issuance Costs	$ 2,700,000	726,000	$ 3,200,000	1,500,000
Notes payable
Maximum loan amount	1,230,000,000		1,230,000,000
Note Payable | Asset Pledged as Collateral without Right | Servicing advances
Carrying value:
Servicing advances, net	265,118,000		265,118,000		$ 357,939,000
Note Payable | Asset Pledged as Collateral without Right | Mortgage servicing rights
Carrying value:
Mortgage servicing rights, at fair value	$ 9,350,647,000		$ 9,350,647,000		$ 8,609,388,000
Assets, Pledging Purpose [Extensible Enumeration]	Notes payable		Notes payable		Notes payable
Note Payable expiring 2024
Notes payable
Maximum loan amount	$ 900,000,000		$ 900,000,000
Committed amount of debt instrument	850,000,000		850,000,000
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 2023-GT1
Notes payable
Maximum loan amount	680,000,000		$ 680,000,000
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	4,197,253,000	2,828,571,000	$ 3,954,973,000	2,689,286,000
Total interest expense	$ 70,157,000	$ 43,968,000	$ 130,294,000	$ 82,800,000
Weighted-average interest rate (as a percent)	6.41%	6.03%	6.34%	5.97%
Unpaid principal balance	$ 4,250,000,000		$ 4,250,000,000		$ 3,200,000,000
Unamortized debt issuance costs and premiums	(64,988,000)		(64,988,000)		(35,968,000)
Debt Instrument Unamortized Premium And Debt Issuance Costs Net	$ 4,185,012,000		$ 4,185,012,000		$ 3,164,032,000
Weighted average interest rate (as a percent)	6.56%		6.56%		6.15%
Carrying value:
Amortization of Debt Issuance Costs	$ 2,900,000	$ 1,500,000	$ 4,900,000	$ 2,900,000
Notes payable
Maximum loan amount	4,250,000,000		$ 4,250,000,000
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%
Loan and Security Agreement
Carrying value:
Unpaid principal balance	100,000,000		$ 100,000,000		$ 325,000,000
Term Loan Notes Payable
Carrying value:
Unpaid principal balance	$ 1,230,000,000		$ 1,230,000,000		$ 1,730,000,000