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Schedule IV - Mortgage Loans on Real Estate Footnotes (Detail)
$ in Thousands
Dec. 31, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Tax basis of loans $ 23,600,000    
CECL reserve $ 326,137 $ 124,679 $ 173,549
Number of loans accounted for under cost-recovery method, floating rate | loan 5    
Principal balance $ 25,017,880 $ 22,003,017 $ 16,572,715
Level 3 | Fair Value, Nonrecurring      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Number of loans accounted for under cost-recovery method, floating rate | loan 5    
Principal balance $ 930,000    
Hospitality Asset in New York City      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
CECL reserve $ 189,800