Quarterly report pursuant to Section 13 or 15(d)

Reverse Mortgages Portfolio Composition - Summary of the Company's Serviced Reverse Mortgage Portfolio Composition and the Remaining UPBs of the Reverse Mortgage Loan Portfolio (Detail)

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Reverse Mortgages Portfolio Composition - Summary of the Company's Serviced Reverse Mortgage Portfolio Composition and the Remaining UPBs of the Reverse Mortgage Loan Portfolio (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Schedule of serviced reverse mortgage portfolio [Line Items]    
Reverse mortgage loans held for investment, subject to HMBS related obligations $ 9,617,079 $ 9,045,104
Total reverse mortgage loans held for investment 721,012 589,429
Total reverse mortgage loans held for sale 4,986,876 4,457,805
Total serviced reverse mortgage loan portfolio 15,387,581 14,264,917
owned reverse mortgage portfolio    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total serviced reverse mortgage loan portfolio 15,324,967 14,092,338
Loans reclassified as government guaranteed receivable    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total serviced reverse mortgage loan portfolio 44,333 49,255
Loans serviced for others    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total serviced reverse mortgage loan portfolio 18,281 123,324
Non Performing HECM Buyouts    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total reverse mortgage loans held for investment, subject to nonrecourse debt 614,824 538,768
Non-agency reverse    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total reverse mortgage loans held for sale 4,095,701 3,777,346
Performing HECM buyouts    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total reverse mortgage loans held for sale 276,351 141,691
Non-agency reverse mortgages    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total reverse mortgage loans held for investment 346,705 215,688
Loans not securitized    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total reverse mortgage loans held for investment [1] 270,273 168,292
Unpoolable loans    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total reverse mortgage loans held for investment [2] 93,459 197,395
Unpoolable tails    
Schedule of serviced reverse mortgage portfolio [Line Items]    
Total reverse mortgage loans held for investment $ 10,575 $ 8,054
[1] Loans not securitized represent primarily newly originated loans.
[2] Unpoolable loans represent primarily loans that have reached 98% of their MCA.