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Loans Receivable, Net - Overall Statistics for Loans Receivable Portfolio (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
SecurityLoan
Dec. 31, 2021
USD ($)
SecurityLoan
Dec. 31, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans | SecurityLoan 203 188  
Principal balance $ 25,160,343 $ 22,156,437 $ 16,652,824
Net book value $ 24,691,743 $ 21,878,338  
Weighted-average maximum maturity (years) 3 years 1 month 6 days 3 years 4 months 24 days  
Percentage of Portfolio 100.00% 100.00%  
Unfunded Loan Commitment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unfunded loan commitments $ 3,806,153 $ 4,180,128  
Floating Rate Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of Portfolio   99.50%  
Fixed Rate Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of Portfolio   0.50%  
Prepayment Restrictions Including Yield Maintenance Lock Out Provisions      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of Portfolio 50.00% 56.00%  
Without Prepayment Restrictions      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of Portfolio 50.00% 44.00%  
LIBOR      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Weighted-average cash coupon (percentage) 3.44% 3.19%  
Weighted-average all-in yield (percentage) 3.84% 3.52%