Loan Sales - Summary of Collection Status Information for Loans Accounted for Sales (Detail) - Variable Interest Entity, Not Primary Beneficiary [Member] - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
Mortgage Loans On Real Estate [Line Items]
UPB of loans outstanding		$ 224,229,222	$ 228,838,471
Collection Status (UPB)
30-89 days delinquent		2,334,456	2,184,500
90 or more days delinquent:
Not in foreclosure		822,290	1,029,962
In foreclosure		86,934	85,045
Bankruptcy		241,304	185,320
Custodial funds managed by the Company	[1]	$ 2,704,150	$ 1,759,974

[1] Custodial funds include borrower and investor custodial cash accounts relating to loans serviced under mortgage servicing agreements and are not included on the Company’s consolidated balance sheets. The Company earns placement fees on certain of the custodial funds it manages on behalf of the loans’ borrowers and investors, and these fees are included in Interest income in the Company’s consolidated statements of income.