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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details)
€ in Millions, £ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2024
USD ($)
Mar. 31, 2022
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Loan
Mar. 31, 2023
GBP (£)
Loan
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 26, 2024
USD ($)
Mar. 31, 2023
GBP (£)
Mar. 31, 2023
EUR (€)
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Mortgage loans on real estate, commercial and consumer, percentage of portfolio                   100.00%   100.00%        
Interest receivable     $ 78,330,000             $ 78,330,000   $ 72,354,000        
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]                   Secured Overnight Financing Rate [Member]            
Amortized cost of loans in cost recovery     473,200,000             $ 473,200,000   693,700,000        
Interest received for loans in cost recovery     7,000,000     $ 600,000       8,300,000 $ 1,900,000          
Unfunded commitments     3,850,000             3,850,000   4,017,000        
Write-offs, specific CECL allowance, funded                   0   81,890,000        
Assessed tax value                   200,800,000            
Interest income from subordinate loans and other lending assets     1,210,000     1,599,000       2,901,000 16,416,000          
Proceeds from pre-payment penalties or accelerated fees     4,200,000     200,000       5,100,000 400,000          
Proceeds received from the repayment and sale of commercial mortgage loans                   1,580,003,000 749,716,000          
Gain on extinguishment of debt     0     (30,000)       0 (495,000)          
Commonwealth                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Loss contingency receivable                           $ 21,900,000    
Loss contingency receivable attributable to ARI                           $ 9,000,000    
Office - London, United Kingdom                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Proceeds from collection of loans receivable               $ 88,400,000 £ 72.2              
Proceeds from interest received               700,000                
Office Property - New York City                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Floating rate 3.92%                              
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) [Member]                              
Fixed rate 5.00%                              
Hotel - Honolulu, Hi                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Loans and leases receivable, gain (loss) on sales, net $ (700,000)                              
Loan, mortgage, held-for-sale, price percentage       99.50%                        
Massachusetts Healthcare                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Equity method interest in joint venture     159,700,000             159,700,000            
Loans and leases receivable, gain (loss) on sales, net     (127,500,000)                          
Past Due 90                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Amortized cost of loans in cost recovery     473,200,000             473,200,000   693,700,000        
Commercial Mortgage and Subordinated Portfolio Segment                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Increase in current expected credit loss allowance, net     127,512,000 $ 7,500,000 $ 142,000,000 0 $ 141,480,000 $ 0                
Specific CECL allowance increased     127,500,000 7,500,000 142,000,000   141,500,000     149,500,000            
Unfunded commitments     17,300,000             17,300,000   0        
Mortgage loans on real estate, commercial and consumer, net     8,300,000             $ 8,300,000   $ 95,500,000        
Write-offs, specific CECL allowance, funded     127,512,000       81,980,000                  
Number of commercial mortgage loans | Loan               3 3              
Loans and leases receivable, gain (loss) on sales, net                     200,000          
Commercial Mortgage and Subordinated Portfolio Segment | Various Properties In Europe                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Mortgage loans on real estate, commercial and consumer, net               $ 219,000,000               € 205.7
Mortgage loans on real estate, commercial and consumer, funded, net               122,400,000               € 115.0
Commercial Mortgage and Subordinated Portfolio Segment | Mixed Use Property - London                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Mortgage loans on real estate, commercial and consumer, net | £                             £ 15.0  
Proceeds received from the repayment and sale of commercial mortgage loans               $ 18,200,000 £ 15.0              
Commercial Mortgage and Subordinated Portfolio Segment | Massachusetts Healthcare                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Specific CECL allowance increased     127,500,000                          
Write-offs, specific CECL allowance, funded     127,500,000                          
Commercial Mortgage and Subordinated Portfolio Segment | Michigan Office                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Specific CECL allowance increased       7,500,000 $ 142,000,000                      
Specific allowance for credit loss reserve on amortized cost basis       7,500,000                        
Floating Rate Loan                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Mortgage loans on real estate, commercial and consumer, percentage of portfolio                   96.00%   99.00%        
Mezzanine Loans                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Mortgage loans on real estate, commercial and consumer, net     $ 700,400,000             $ 700,400,000   $ 674,500,000        
Senior and Junior Mezzanine Loans                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Mortgage loans on real estate, commercial and consumer, percentage of portfolio                   8.90%   8.00%        
Junior Mezzanine B Loan                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Increase in Specific CECL Allowance, net                         $ 66,500,000      
Junior Mezzanine A Loan                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Increase in Specific CECL Allowance, net             $ 126,000,000                  
Mortgage, Amortized cost | Hotel - Honolulu, Hi                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Loans and leases receivable, gain (loss) on sales, net                   $ 700,000            
Securitization Vehicle                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Interest income from subordinate loans and other lending assets           $ 500,000         $ 3,100,000          
Senior Loans                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Proceeds from (repayments of) secured debt       $ 108,300,000                        
Cleveland Multifamily                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Floating rate 3.25%                              
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) [Member]                              
Fixed rate 6.00%                              
Debt instrument, extension term                   2 years            
First Mortgage Loan                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Percentage representing original whoile loan amount   41.20%                            
First Mortgage Loan | Eight Hospitals in Massachusetts                                
Accounts, Notes, Loans and Financing Receivable [Line Items]                                
Loan to cost percentage   55.00%