Quarterly report pursuant to Section 13 or 15(d)

Mortgage Servicing Rights, at Fair Value - Summary of Servicing Portfolio and its Activities (Detail)

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Mortgage Servicing Rights, at Fair Value - Summary of Servicing Portfolio and its Activities (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Servicing Assets at Fair Value [Line Items]    
Servicing rights $ 1,073,680 $ 8,602,338
Weighted average interest rate 3.72% 3.59%
Fannie Mae/Freddie Mac    
Servicing Assets at Fair Value [Line Items]    
Servicing rights $ 126,560 $ 7,051,851
Ginnie Mae    
Servicing Assets at Fair Value [Line Items]    
Servicing rights 285 532,328
Private investors    
Servicing Assets at Fair Value [Line Items]    
Servicing rights $ 946,835 $ 1,018,159