Quarterly report pursuant to Section 13 or 15(d)

Other Financing Lines of Credit - Summary Of Components of Other Financing Lines of Credit (Detail)

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Other Financing Lines of Credit - Summary Of Components of Other Financing Lines of Credit (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Line of Credit Facility [Line Items]    
Total Capacity $ 1,508,304  
Outstanding borrowings 1,054,568 $ 928,479
Reverse Lines    
Line of Credit Facility [Line Items]    
Total Capacity 1,473,966  
Outstanding borrowings 1,020,230 870,136
Reverse Lines | November 2024 - October 2026, First Lien Mortgages    
Line of Credit Facility [Line Items]    
Total Capacity 995,000  
Outstanding borrowings 576,475 432,918
Reverse Lines | Various Maturities, Mortgage Related Assets    
Line of Credit Facility [Line Items]    
Total Capacity 368,966  
Outstanding borrowings 345,040 344,367
Reverse Lines | October 2027, MSR    
Line of Credit Facility [Line Items]    
Total Capacity 70,000  
Outstanding borrowings 69,231 69,231
Reverse Lines | October 2025, Unsecuritized Tails    
Line of Credit Facility [Line Items]    
Total Capacity 40,000  
Outstanding borrowings 29,484 23,620
Mortgage Lines    
Line of Credit Facility [Line Items]    
Total Capacity 34,338  
Outstanding borrowings 34,338 38,343
Mortgage Lines | Various Maturities, Mortgage Related Assets    
Line of Credit Facility [Line Items]    
Total Capacity 34,338  
Outstanding borrowings 34,338 36,208
Mortgage Lines | First Lien Mortgages    
Line of Credit Facility [Line Items]    
Total Capacity 0  
Outstanding borrowings 0 2,135
Commercial Lines | Mortgage Related Assets    
Line of Credit Facility [Line Items]    
Total Capacity 0  
Outstanding borrowings $ 0 $ 20,000