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
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Schedule of serviced reverse mortgage portfolio [Line Items]    
Reverse mortgage loans held for investment, subject to HMBS related obligations $ 10,109,820 $ 9,849,835
Total reverse mortgage loans held for investment 988,321 815,426
Total reverse mortgage loans held for sale 5,481,952 5,165,479
Total serviced reverse mortgage loan portfolio 16,650,424 15,897,205
owned reverse mortgage portfolio    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total serviced reverse mortgage loan portfolio 16,580,093 15,830,740
Loans reclassified as government guaranteed receivable    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total serviced reverse mortgage loan portfolio 56,372 48,625
Loans serviced for others    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total serviced reverse mortgage loan portfolio 13,959 17,840
Non Performing HECM Buyouts    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total reverse mortgage loans held for investment, subject to nonrecourse debt 656,608 590,729
Non-agency reverse mortgages    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total reverse mortgage loans held for sale 4,520,841 4,285,661
Performing HECM buyouts    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total reverse mortgage loans held for sale 304,503 289,089
Non-agency reverse mortgages    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total reverse mortgage loans held for investment 601,067 432,144
Loans not securitized    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total reverse mortgage loans held for investment [1] 313,569 266,723
Unpoolable loans    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total reverse mortgage loans held for investment [2] 65,303 104,551
Unpoolable tails    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total reverse mortgage loans held for investment $ 8,382 $ 12,008
[1] Loans not securitized represent primarily newly originated loans.
[2] Unpoolable loans represent primarily loans that have reached 98% of their MCA.