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Notes Payable, Bank Credit Facility, Interest and Amortization of Deferred Debt Costs - Narrative (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Oct. 01, 2030
Oct. 01, 2027
Aug. 20, 2025
USD ($)
Aug. 23, 2022
USD ($)
swap
Debt Instrument [Line Items]            
Principal amount $ 1,611,969,000 $ 1,600,000,000        
Notes payable, principal balance 1,380,000,000          
Debt outstanding with variable-rate 230,000,000 187,000,000.0        
Carrying value of properties collateralizing mortgage notes 1,600,000,000 1,600,000,000        
Debt outstanding with fixed-rate   1,370,000,000        
Revolving credit facility payable, net 185,376,000 186,489,000        
Number of interest rate swaps | swap           2
Long-term debt 1,588,059,000          
Unamortized deferred debt costs 23,910,000 20,100,000        
Debt issuance costs amortization 9,700,000 $ 11,200,000        
Thruway Mortgage            
Debt Instrument [Line Items]            
Principal amount 68,900,000          
Long-term debt $ 17,500,000          
Twinbrook Quarter            
Debt Instrument [Line Items]            
Guarantor obligations, liquidation proceeds, percentage (as percent) 100.00%          
Twinbrook Quarter            
Debt Instrument [Line Items]            
Line of credit facility, remaining borrowing capacity $ 6,100,000          
Long-term debt 138,900,000          
Hampden House            
Debt Instrument [Line Items]            
Line of credit facility, remaining borrowing capacity $ 25,400,000          
Guarantor obligations, liquidation proceeds, percentage (as percent) 100.00%          
Guarantor obligations, current carrying value $ 26,600,000          
Guarantor obligations, maximum exposure $ 107,600,000          
Revolving Credit Facility            
Debt Instrument [Line Items]            
Interest rate spread (as percent) 1.40% 1.40%        
Term Facility            
Debt Instrument [Line Items]            
Interest rate spread (as percent) 1.35% 1.35%        
Unsecured Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility, remaining borrowing capacity $ 101,100,000 $ 134,500,000        
Revolving credit facility payable, net 330,000,000 287,000,000.0        
Letter of Credit            
Debt Instrument [Line Items]            
Revolving credit facility payable, net 185,000 185,000        
Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity 600,000,000 525,000,000        
Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity 190,000,000.0          
Line of Credit | Term Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity 140,000,000 100,000,000.0        
Line of Credit | New Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity $ 460,000,000 $ 425,000,000        
Secured Debt | Term Loan            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity           $ 100,000,000.0
Secured Debt | Term Loan | Agreement Ending October 1, 2030            
Debt Instrument [Line Items]            
Derivative, notional amount           50,000,000.0
Secured Debt | Term Loan | Agreement Ending October 1, 2030 | Forecast            
Debt Instrument [Line Items]            
Derivative, fixed interest rate (as a percent)     2.91%      
Secured Debt | Term Loan | Agreement Ending October 1, 2027            
Debt Instrument [Line Items]            
Derivative, notional amount           $ 50,000,000.0
Secured Debt | Term Loan | Agreement Ending October 1, 2027 | Forecast            
Debt Instrument [Line Items]            
Derivative, fixed interest rate (as a percent)       2.96%    
Mortgages | Kentlands Place Mortgage            
Debt Instrument [Line Items]            
Long-term debt         $ 25,900,000