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Loans Receivable, Net - Overall Statistics for Loans Receivable Portfolio (Detail)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2023
security_loan
Sep. 30, 2023
Sep. 30, 2023
loan
Dec. 31, 2022
security_loan
Dec. 31, 2022
Dec. 31, 2022
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Number of loans     185   185 203   203
Principal balance $ 23,849,497 $ 25,160,343            
Net book value $ 23,252,478 $ 24,691,743            
Weighted-average maximum maturity (years) 2 years 7 months 6 days 3 years 1 month 6 days            
Percentage of loans by principal balance, fixed rate       1.00%        
Percentage of portfolio       100.00%     100.00%  
Interest Rate Swaps                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Notional amount $ 229,900              
Unfunded Loan Commitment                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Unfunded loan commitments $ 2,671,851 $ 3,806,153            
Prepayment Restrictions Including Yield Maintenance Lock Out Provisions                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Percentage of portfolio       18.00%     50.00%  
Without Prepayment Restrictions                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Percentage of portfolio       82.00%     50.00%  
Secured Overnight Financing Rate (SOFR)                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Weighted-average cash coupon (percentage) 3.43% 3.44%            
Weighted-average all-in yield (percentage) 3.77% 3.84%            
Percentage of loans by principal balance, floating rate       99.00%