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Organization and Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Properties
State
Community
Property
shares
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2023
USD ($)
Properties
State
Community
Property
shares
Sep. 30, 2022
USD ($)
shares
Dec. 31, 2025
Property
Dec. 31, 2024
Property
Dec. 31, 2022
USD ($)
shares
Real Estate Properties [Line Items]              
General Partners' Capital Account, Units Outstanding | shares 116,686,730 115,447,252 116,686,730 115,447,252      
Number of Real Estate Properties | Community 290   290        
Development and capital improvements in progress $ 338,864   $ 338,864       $ 332,035
Number of States in which Entity Operates | State 16   16        
Consolidated assets $ 11,382,322   $ 11,382,322       11,241,165
Consolidated liabilities 5,060,700   5,060,700       5,030,746
Real Estate Investments, Joint Ventures $ 37,700   $ 37,700        
Percentage Of Rental Revenue From Leasing Of Apartment Homes     94.00%        
Percentage Of Reimbursable Revenue From Leasing Of Apartment Homes     5.00%        
Percentage of Rental Revenue and Other Income From Non-leasing Activities     1.00%        
Operating Lease, Right-of-Use Asset, Statement of Financial Position Other assets   Other assets        
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Accrued expenses and other liabilities   Accrued expenses and other liabilities        
Operating Lease, Right-of-Use Asset $ 42,900   $ 42,900       44,600
Right-of-use Lease, Liability 27,572   27,572       28,700
Marketable equity securities received 7,700 $ 16,300 7,700 $ 16,300      
Marketable equity securities 15,200   15,200       8,000
Investment Income 7,100   500        
Investment Expense   6,800   10,100      
Limited Partnership [Member]              
Real Estate Properties [Line Items]              
Investment Income 600   1,300        
Investment Expense   $ 1,400   29,200      
Other Assets [Member]              
Real Estate Properties [Line Items]              
Real Estate Investments, Joint Ventures 37,700   37,700       36,700
Real Estate [Member]              
Real Estate Properties [Line Items]              
Cash proceeds       $ 43,100      
Real Estate [Member] | Post Massachusetts Avenue [Member]              
Real Estate Properties [Line Items]              
Real Estate Investments, Joint Ventures $ 42,300   $ 42,300       $ 42,300
Maximum [Member] | Accounting Standards Update 2016-02 [Member]              
Real Estate Properties [Line Items]              
Operating lease, term of contract 1 year   1 year        
Development Properties [Member]              
Real Estate Properties [Line Items]              
Number of Real Estate Properties | Community 5   5        
Number of units under development community | Properties 1,970   1,970        
Development Properties [Member] | Expected Costs              
Real Estate Properties [Line Items]              
Development and capital improvements in progress $ 642,700   $ 642,700        
Development Properties [Member] | Scenario Forecast [Member]              
Real Estate Properties [Line Items]              
Number of Real Estate Properties | Property         2 3  
Retail              
Real Estate Properties [Line Items]              
Number of Real Estate Properties | Property 34   34        
M A A L P              
Real Estate Properties [Line Items]              
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest     97.40% 97.30%      
Limited Partnership [Member]              
Real Estate Properties [Line Items]              
General Partners' Capital Account, Units Outstanding | shares 116,686,730   116,686,730       115,480,336
Number of Real Estate Properties | Property 1   1        
Development and capital improvements in progress $ 338,864   $ 338,864       $ 332,035
Consolidated assets 11,382,322   11,382,322       11,241,165
Consolidated liabilities 5,060,719   5,060,719       5,030,765
Limited Partnership [Member] | Real Estate [Member] | Variable Interest Entity Primary Beneficiary [Member]              
Real Estate Properties [Line Items]              
Consolidated assets 316,600   316,600       279,600
Consolidated liabilities $ 16,200   $ 16,200       $ 14,500
Limited Partnership [Member] | Minimum [Member]              
Real Estate Properties [Line Items]              
Percentage of ownership interests of all consolidated subsidiaries (percent) 80.00%   80.00%        
Limited Partnership [Member] | Maximum [Member]              
Real Estate Properties [Line Items]              
Percentage of ownership interests of all consolidated subsidiaries (percent) 100.00%   100.00%        
Limited Partnership [Member] | Development Properties [Member] | Costs Incurred To Date              
Real Estate Properties [Line Items]              
Development and capital improvements in progress $ 346,300   $ 346,300