Quarterly report pursuant to Section 13 or 15(d)

Reverse Mortgage Portfolio Composition - Summary of the Composition and the Remaining UPBs of the Reverse Mortgage Loan Portfolio (Detail)

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Reverse Mortgage Portfolio Composition - Summary of the Composition and the Remaining UPBs of the Reverse Mortgage Loan Portfolio (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to HMBS related obligations $ 10,609,500 $ 9,849,835
Reverse mortgage loans held for investment 1,078,048 815,426
Reverse mortgage loans held for investment, subject to nonrecourse debt 6,501,202 5,165,479
Serviced reverse mortgage loan portfolio $ 18,269,447 15,897,205
Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of unpoolable loan 98.00%  
Total owned reverse mortgage portfolio    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serviced reverse mortgage loan portfolio $ 18,188,750 15,830,740
Loans reclassified as government guaranteed receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serviced reverse mortgage loan portfolio 67,706 48,625
Loans serviced for others    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serviced reverse mortgage loan portfolio 12,991 17,840
Nonperforming HECM buyouts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonperforming HECM buyouts 584,206 590,729
Performing HECM buyouts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to nonrecourse debt 320,625 289,089
Non-agency reverse mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to nonrecourse debt 5,596,371 4,285,661
Non-agency reverse mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment 839,877 432,144
Loans not securitized    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment 137,477 266,723
Unpoolable loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment 91,286 104,551
Unpoolable tails    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment $ 9,408 $ 12,008