Annual report pursuant to Section 13 and 15(d)

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

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Reverse Mortgages Portfolio Composition - Summarizes the Owned Reverse Mortgage Portfolio by Product Type (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Schedule Of Owned Reverse Mortgage Portfolio [Line Items]    
Total owned reverse mortgage portfolio $ 15,830,740 $ 14,092,338
Fixed rate loans    
Schedule Of Owned Reverse Mortgage Portfolio [Line Items]    
Total owned reverse mortgage portfolio 5,384,865 5,010,659
Adjustable rate loans    
Schedule Of Owned Reverse Mortgage Portfolio [Line Items]    
Total owned reverse mortgage portfolio $ 10,445,875 $ 9,081,679