Quarterly report pursuant to Section 13 or 15(d)

Reverse Mortgage Portfolio Composition - Summarizes the Owned Reverse Mortgage Portfolio by Product Type (Detail)

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Reverse Mortgage Portfolio Composition - Summarizes the Owned Reverse Mortgage Portfolio by Product Type (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Owned reverse mortgage portfolio $ 25,210,301 $ 18,683,925
Fixed rate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Owned reverse mortgage portfolio 6,734,204 6,548,902
Adjustable rate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Owned reverse mortgage portfolio $ 18,476,097 $ 12,135,023