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
Mar. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to HMBS related obligations $ 17,113,496 $ 16,875,437
Reverse mortgage loans held for investment, subject to nonrecourse debt 8,483,961 8,257,750
Reverse mortgage loans held for investment 519,237 558,577
Serviced reverse mortgage loan portfolio $ 26,345,895 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 $ 26,116,694 25,691,764
Loans reclassified as government guaranteed receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serviced reverse mortgage loan portfolio 72,981 94,636
Loans serviced for others    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serviced reverse mortgage loan portfolio 156,220 164,742
Nonperforming HECM buyouts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonperforming HECM buyouts 382,644 409,965
Performing HECM buyouts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to nonrecourse debt 215,839 216,184
Non-agency reverse mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to nonrecourse debt 7,885,478 7,631,601
Non-agency reverse mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment 243,500 241,424
Loans not securitized    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment 107,309 101,820
Unpoolable loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment 157,032 203,957
Unpoolable HECM tails    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment $ 11,396 $ 11,376