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Loans Receivable, Net - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
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, 2023
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Weighted-average risk rating 3.0           3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0  
Net increase (decrease) in CECL reserve $ (45,100)                            
Amount charged off 42,111 $ 45,057 $ 41,824 $ 16,989 $ 12,537 $ 61,013   $ 128,992       $ 384,603      
CECL reserve 695,719 740,851 741,541 1,011,059 893,938 751,370 $ 695,719 695,719 $ 695,719 $ 695,719 $ 695,719 733,936 $ 733,936 $ 733,936 $ 576,936
Number of loans                 137 137     130 130  
Principal balance 18,066,919           18,066,919 18,066,919 $ 18,066,919 $ 18,066,919 18,066,919 19,047,518 $ 19,047,518 $ 19,047,518  
Net book value 17,371,200           17,371,200 17,371,200 $ 17,371,200 17,371,200 17,371,200 18,313,582 18,313,582 18,313,582  
Number of loan modifications | loan                 10            
Real estate owned, net 933,635           933,635 933,635 $ 933,635 933,635 933,635 588,185 588,185 588,185  
Joint Venture                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Loan exposure 43,300           43,300 43,300 43,300 43,300 43,300 43,300 43,300 43,300  
Real estate owned, net 32,100           32,100 32,100 $ 32,100 32,100 32,100 32,400 $ 32,400 32,400  
5                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loans | loan                 12       13    
Principal balance 1,174,152           1,174,152 1,174,152 $ 1,174,152 1,174,152 1,174,152 1,827,561 $ 1,827,561 1,827,561  
4                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loans | loan                 17       20    
Principal balance 2,732,203           2,732,203 2,732,203 $ 2,732,203 2,732,203 2,732,203 2,707,104 $ 2,707,104 2,707,104  
3                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loans | loan                 80       65    
Principal balance 10,578,120           10,578,120 10,578,120 $ 10,578,120 10,578,120 10,578,120 9,246,692 $ 9,246,692 9,246,692  
2                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loans | loan                 22       21    
Principal balance 3,173,245           $ 3,173,245 3,173,245 $ 3,173,245 3,173,245 $ 3,173,245 3,346,881 $ 3,346,881 3,346,881  
Payment Deferral                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loan modifications | loan                 2            
Aggregate amortized cost basis of loans               367,300              
Percentage to aggregate loans receivable portfolio                     2.00%        
Extended Maturity                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loan modifications | loan                 3            
Aggregate amortized cost basis of loans               506,500              
Percentage to aggregate loans receivable portfolio                     2.80%        
Extended Maturity | 5                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loan modifications | loan                 5            
Extended Maturity, Loan One                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Extension term             5 years                
Proceeds from repayment of loan               6,000              
Extended Maturity, Loan Two                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Extension term             3 years 9 months 18 days                
Proceeds from repayment of loan               1,700              
Extended Maturity, Loan Three                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Extension term             4 years 9 months 18 days                
Increase (decrease) in rate                     (0.10%)        
Extended Maturity, Loan Four                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Extension term             1 year                
Increase (decrease) in rate                     (2.43%)        
Proceeds from repayment of loan               25,000              
Extended Maturity, Loan Five                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Extension term             4 years 3 months 18 days                
Increase (decrease) in rate                     (3.56%)        
Extended Maturity, Senior Loans                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loan modifications | loan                 5            
Extended Maturity, Senior Loans | 4                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loan modifications | loan                 2            
Extended Maturity, Senior Loans | 3                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loan modifications | loan                 1            
Extended Maturity, Senior Loans | 2                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loan modifications | loan                 2            
Office                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loans | loan                 42       41    
Principal balance 5,489,331           $ 5,489,331 5,489,331 $ 5,489,331 5,489,331 $ 5,489,331 7,386,333 $ 7,386,333 7,386,333  
Number of loan modifications | loan                 4            
Hospitality                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loans | loan                 14       16    
Principal balance 2,096,519           2,096,519 2,096,519 $ 2,096,519 2,096,519 2,096,519 2,768,374 $ 2,768,374 2,768,374  
Mixed Use Asset                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loan modifications | loan                 1            
12 Loans | Impaired loans                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loans | loan                 12            
Cash proceeds 9,700                            
Impaired loans                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Amount charged off 42,111 45,057 41,824 16,989 12,537 61,013                  
CECL reserve 505,406 $ 558,767 $ 555,379 $ 883,577 $ 759,380 $ 602,599 505,406 505,406 $ 505,406 505,406 505,406 580,651 580,651 580,651 $ 417,670
Principal balance 1,174,152           1,174,152 1,174,152 1,174,152 1,174,152 1,174,152 1,827,561 1,827,561 1,827,561  
Impaired loans | 5                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Principal balance 1,174,152           1,174,152 1,174,152 1,174,152 1,174,152 1,174,152 1,827,561 1,827,561 1,827,561  
Impaired loans | 4                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Principal balance 0           0 0 0 0 0 0 0 0  
Impaired loans | 3                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Principal balance 0           0 0 0 0 0 0 0 0  
Impaired loans | 2                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Principal balance 0           0 0 0 0 0 $ 0 $ 0 $ 0  
Impaired loans | Office                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
CECL reserve 382,200           382,200 382,200 $ 382,200 382,200 382,200        
Unfunded Loan Commitment                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Number of loans | loan                 57            
Unfunded Loan Commitment | Payment Deferral                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Unfunded loan commitments 4,700           4,700 4,700 $ 4,700 4,700 4,700        
Unfunded Loan Commitment | Extended Maturity                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
Unfunded loan commitments 32,700           $ 32,700 $ 32,700 $ 32,700 $ 32,700 $ 32,700        
Asset-specific CECL Reserves                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
(Decrease) increase in net CECL reserve (53,400)                            
General CECL Reserves                              
Accounts, Notes, Loans and Financing Receivable [Line Items]                              
(Decrease) increase in net CECL reserve $ 8,200