Annual report pursuant to Section 13 and 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
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Owned reverse mortgage portfolio $ 18,683,925 $ 15,830,740
Fixed rate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Owned reverse mortgage portfolio 6,548,902 5,384,865
Adjustable rate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Owned reverse mortgage portfolio $ 12,135,023 $ 10,445,875