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Loans Receivable, Net - Property Type and Geographic Distribution of Properties Securing Loans in Portfolio (Detail)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
loan
Sep. 30, 2025
USD ($)
security_loan
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
loan
Dec. 31, 2024
USD ($)
security_loan
Dec. 31, 2024
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans 137 137   130 130              
Net book value $ 18,066,919 $ 18,066,919 $ 18,066,919 $ 19,047,518 $ 19,047,518 $ 19,047,518            
CECL reserve (695,719) (695,719) (695,719) (733,936) (733,936) (733,936) $ (740,851) $ (741,541) $ (1,011,059) $ (893,938) $ (751,370) $ (576,936)
Loans receivable, net 17,371,200 17,371,200 17,371,200 18,313,582 18,313,582 18,313,582            
Net Loan Exposure 16,793,738 16,793,738 16,793,738 17,034,303 17,034,303 17,034,303            
Cost-recovery proceeds 69,200 69,200 69,200 106,700 106,700 106,700            
Loan participations sold 0 0 0 100,064 100,064 100,064            
Asset-specific debt, net                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Principal balance 629,890 629,890 629,890 1,228,110 1,228,110 1,228,110            
Long-term debt $ 627,916 627,916 $ 627,916 1,224,841 1,224,841 1,224,841            
Junior Loan Participation                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Loan participations sold       $ 100,064 100,064 $ 100,064            
Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     100.00%     100.00%            
Subtotal                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 102     100                
Net book value $ 10,233,490 10,233,490 $ 10,233,490 $ 12,430,396 12,430,396 $ 12,430,396            
Net Loan Exposure $ 9,192,294 9,192,294 $ 9,192,294 $ 10,537,164 10,537,164 $ 10,537,164            
Subtotal | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     54.00%     62.00%            
Sunbelt                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 45     44                
Net book value $ 4,203,737 4,203,737 $ 4,203,737 $ 4,520,632 4,520,632 $ 4,520,632            
Net Loan Exposure $ 3,727,255 3,727,255 $ 3,727,255 $ 4,084,242 4,084,242 $ 4,084,242            
Sunbelt | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     22.00%     24.00%            
Northeast                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 23     21                
Net book value $ 2,768,431 2,768,431 $ 2,768,431 $ 4,614,582 4,614,582 $ 4,614,582            
Net Loan Exposure $ 2,431,400 2,431,400 $ 2,431,400 $ 3,452,961 3,452,961 $ 3,452,961            
Northeast | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     14.00%     20.00%            
West                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 23     21                
Net book value $ 1,957,019 1,957,019 $ 1,957,019 $ 1,865,382 1,865,382 $ 1,865,382            
Net Loan Exposure $ 1,873,533 1,873,533 $ 1,873,533 $ 1,746,309 1,746,309 $ 1,746,309            
West | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     11.00%     10.00%            
Midwest                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 8     10                
Net book value $ 855,704 855,704 $ 855,704 $ 997,156 997,156 $ 997,156            
Net Loan Exposure $ 713,354 713,354 $ 713,354 $ 820,858 820,858 $ 820,858            
Midwest | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     4.00%     5.00%            
Northwest                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 3     4                
Net book value $ 448,599 448,599 $ 448,599 $ 432,644 432,644 $ 432,644            
Net Loan Exposure $ 446,752 446,752 $ 446,752 $ 432,794 432,794 $ 432,794            
Northwest | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     3.00%     3.00%            
Subtotal                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 35     30                
Net book value $ 7,833,429 7,833,429 $ 7,833,429 $ 6,617,122 6,617,122 $ 6,617,122            
Net Loan Exposure $ 7,601,444 7,601,444 $ 7,601,444 $ 6,497,139 6,497,139 $ 6,497,139            
Subtotal | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     46.00%     38.00%            
United Kingdom                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 17     16                
Net book value $ 3,128,895 3,128,895 $ 3,128,895 $ 2,916,145 2,916,145 $ 2,916,145            
Net Loan Exposure $ 3,114,230 3,114,230 $ 3,114,230 $ 2,839,096 2,839,096 $ 2,839,096            
United Kingdom | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     19.00%     17.00%            
Ireland                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 3     3                
Net book value $ 1,197,444 1,197,444 $ 1,197,444 $ 1,050,276 1,050,276 $ 1,050,276            
Net Loan Exposure $ 1,190,045 1,190,045 $ 1,190,045 $ 1,048,329 1,048,329 $ 1,048,329            
Ireland | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     7.00%     6.00%            
Australia                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 5     3                
Net book value $ 1,107,136 1,107,136 $ 1,107,136 $ 920,182 920,182 $ 920,182            
Net Loan Exposure $ 1,114,282 1,114,282 $ 1,114,282 $ 923,507 923,507 $ 923,507            
Australia | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     7.00%     5.00%            
Spain                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 2     3                
Net book value $ 643,117 643,117 $ 643,117 $ 785,368 785,368 $ 785,368            
Net Loan Exposure $ 595,013 595,013 $ 595,013 $ 744,287 744,287 $ 744,287            
Spain | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     4.00%     4.00%            
Sweden                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 1     1                
Net book value $ 505,298 505,298 $ 505,298 $ 429,084 429,084 $ 429,084            
Net Loan Exposure $ 504,853 504,853 $ 504,853 $ 429,724 429,724 $ 429,724            
Sweden | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     3.00%     2.00%            
Canada                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 1                      
Net book value $ 448,994 448,994 $ 448,994                  
Net Loan Exposure $ 284,952 284,952 $ 284,952                  
Canada | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     2.00%                  
Other Europe                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 5     3                
Net book value $ 741,582 741,582 $ 741,582 $ 455,417 455,417 $ 455,417            
Net Loan Exposure $ 737,162 737,162 $ 737,162 $ 451,245 451,245 $ 451,245            
Other Europe | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     4.00%     4.00%            
Other International                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 1     1                
Net book value $ 60,963 60,963 $ 60,963 $ 60,650 60,650 $ 60,650            
Net Loan Exposure $ 60,907 60,907 $ 60,907 $ 60,951 60,951 $ 60,951            
Other International | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     0.00%     0.00%            
Office                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 42     41                
Net book value $ 5,489,331 5,489,331 $ 5,489,331 $ 7,386,333 7,386,333 $ 7,386,333            
Net Loan Exposure $ 4,845,825 4,845,825 $ 4,845,825 $ 5,729,418 5,729,418 $ 5,729,418            
Office | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     29.00%     33.00%            
Multifamily                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 47     50                
Net book value $ 4,432,183 4,432,183 $ 4,432,183 $ 5,091,767 5,091,767 $ 5,091,767            
Net Loan Exposure $ 4,289,958 4,289,958 $ 4,289,958 $ 4,934,364 4,934,364 $ 4,934,364            
Multifamily | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     25.00%     29.00%            
Industrial                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 18     11                
Net book value $ 3,561,323 3,561,323 $ 3,561,323 $ 2,030,627 2,030,627 $ 2,030,627            
Net Loan Exposure $ 3,524,478 3,524,478 $ 3,524,478 $ 2,000,831 2,000,831 $ 2,000,831            
Industrial | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     21.00%     12.00%            
Hospitality                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 14     16                
Net book value $ 2,096,519 2,096,519 $ 2,096,519 $ 2,768,374 2,768,374 $ 2,768,374            
Net Loan Exposure $ 1,994,080 1,994,080 $ 1,994,080 $ 2,663,349 2,663,349 $ 2,663,349            
Hospitality | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     12.00%     16.00%            
Retail                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 8     5                
Net book value $ 769,377 769,377 $ 769,377 $ 555,553 555,553 $ 555,553            
Net Loan Exposure $ 676,140 676,140 $ 676,140 $ 532,069 532,069 $ 532,069            
Retail | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     4.00%     3.00%            
Self-storage                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 3                      
Net book value $ 653,016 653,016 $ 653,016                  
Net Loan Exposure $ 488,715 488,715 $ 488,715                  
Self-storage | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     3.00%                  
Life Sciences / Studio                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 3     3                
Net book value $ 341,730 341,730 $ 341,730 $ 342,817 342,817 $ 342,817            
Net Loan Exposure $ 290,881 290,881 $ 290,881 $ 337,687 337,687 $ 337,687            
Life Sciences / Studio | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     2.00%     2.00%            
Other                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of Loans | loan 2     4                
Net book value $ 723,440 723,440 $ 723,440 $ 872,047 872,047 $ 872,047            
Net Loan Exposure $ 683,661 $ 683,661 $ 683,661 $ 836,585 $ 836,585 $ 836,585            
Other | Loan Exposure Risk | Financing Receivables                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Net Loan Exposure Percentage of Portfolio     4.00%     5.00%