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
Jun. 30, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to HMBS related obligations $ 17,320,933 $ 16,875,437
Reverse mortgage loans held for investment, subject to nonrecourse debt 8,491,733 8,257,750
Reverse mortgage loans held for investment 640,152 558,577
Serviced reverse mortgage loan portfolio $ 26,669,426 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 $ 26,452,818 25,691,764
Loans reclassified as government guaranteed receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serviced reverse mortgage loan portfolio 67,737 94,636
Loans serviced for others    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serviced reverse mortgage loan portfolio 148,871 164,742
Nonperforming HECM buyouts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonperforming HECM buyouts 349,694 409,965
Performing HECM buyouts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to nonrecourse debt 218,411 216,184
Non-agency reverse mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to nonrecourse debt 7,923,628 7,631,601
Non-agency reverse mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment 370,975 241,424
Loans not securitized    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment 89,558 101,820
Unpoolable loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment 168,285 203,957
Unpoolable HECM tails    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment $ 11,334 $ 11,376