Annual report pursuant to Section 13 and 15(d)

Concentrations of Risk - Summary of Non Performing HECM Buyouts (Detail)

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Concentrations of Risk - Summary of Non Performing HECM Buyouts (Detail) - Credit Concentration Risk - Non Performing HECM Buyouts - Mortgage Loans Customer - Mortgage Loans Benchmark
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Concentration Risk [Line Items]    
Concentration Risk, Percentage 100.00% 100.00%
New York    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 17.00% 15.00%
Puerto Rico    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 15.00% 21.00%
California    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 10.00% 9.00%
Texas    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 10.00% 9.00%
Florida    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 6.00% 5.00%
Other    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 42.00% 41.00%