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Loans Receivable, Net - Overall Statistics for Loans Receivable Portfolio (Detail)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
loan
Sep. 30, 2025
USD ($)
security_loan
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
loan
Dec. 31, 2024
USD ($)
security_loan
Dec. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Number of loans   137 137     130 130    
Principal balance $ 18,188,534 $ 18,188,534 $ 18,188,534 $ 18,188,534 $ 19,203,126 $ 19,203,126 $ 19,203,126 $ 19,203,126  
Net book value 17,371,200 17,371,200 17,371,200 17,371,200 18,313,582 18,313,582 18,313,582 18,313,582  
Unfunded loan commitments $ 13,741 $ 13,741 $ 13,741 $ 13,741 $ 10,412 $ 10,412 $ 10,412 $ 10,412 $ 8,300
Weighted-average cash coupon (percentage) 3.24% 3.24% 3.24% 3.24% 3.46% 3.46% 3.46% 3.46%  
Weighted-average all-in yield (percentage)       3.46%       3.78%  
Weighted-average maximum maturity (years) 2 years 4 months 24 days       2 years 1 month 6 days        
Debt instrument, variable interest rate, type [Extensible Enumeration] SOFR       SOFR        
Percentage of loans by principal balance, floating rate 98.00% 98.00% 98.00% 98.00%          
Percentage of loans by principal balance, fixed rate 2.00% 2.00% 2.00% 2.00%          
Percent of loans subject to prepayment restrictions 31.00% 31.00% 31.00% 31.00% 10.00% 10.00% 10.00% 10.00%  
Percent of loans not subject to prepayment restrictions 69.00% 69.00% 69.00% 69.00% 90.00% 90.00% 90.00% 90.00%  
Unfunded Loan Commitment                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Number of loans | loan   57              
Unfunded loan commitments $ 1,532,429 $ 1,532,429 $ 1,532,429 $ 1,532,429 $ 1,263,068 $ 1,263,068 $ 1,263,068 $ 1,263,068