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, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to HMBS related obligations $ 16,522,369 $ 10,719,000
Reverse mortgage loans held for investment, subject to nonrecourse debt 8,200,222 7,240,125
Reverse mortgage loans held for investment 487,710 724,800
Serviced reverse mortgage loan portfolio $ 25,472,548 18,841,394
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 $ 25,210,301 18,683,925
Loans reclassified as government guaranteed receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serviced reverse mortgage loan portfolio 93,296 76,033
Loans serviced for others    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serviced reverse mortgage loan portfolio 168,951 81,436
Nonperforming HECM buyouts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonperforming HECM buyouts 446,944 541,071
Performing HECM buyouts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to nonrecourse debt 227,760 328,845
Non-agency reverse mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment, subject to nonrecourse debt 7,525,518 6,370,209
Non-agency reverse mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment 141,506 489,038
Loans not securitized    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment 152,002 88,029
Unpoolable loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment 182,692 136,657
Unpoolable HECM tails    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reverse mortgage loans held for investment $ 11,510 $ 11,076