Annual report [Section 13 and 15(d), not S-K Item 405]

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
Dec. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to HMBS related obligations $ 17,652,495 $ 16,875,437
Reverse mortgage loans held for investment, subject to nonrecourse debt 9,186,447 8,257,750
Reverse mortgage loans held for investment 503,727 558,577
Serviced reverse mortgage loan portfolio $ 27,476,567 25,951,142
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 $ 27,342,669 25,691,764
Loans reclassified as government guaranteed receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serviced reverse mortgage loan portfolio 45,773 94,636
Loans serviced for others    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serviced reverse mortgage loan portfolio 88,125 164,742
Nonperforming HECM buyouts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonperforming HECM buyouts 408,614 409,965
Non-agency reverse mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to nonrecourse debt 8,567,792 7,631,601
Non-agency reverse mortgages | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to nonrecourse debt 4,000  
Performing HECM buyouts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to nonrecourse debt 210,041 216,184
Non-agency reverse mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment 270,956 241,424
HECM loans not securitized    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment 101,100 101,820
Unpoolable HECM loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment $ 131,671 $ 215,333