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Organization and Summary of Significant Accounting Policies (Textual) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
ft²
Property
Communitie
State
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Jan. 01, 2019
Real Estate Properties [Line Items]        
General Partners' Capital Account, Units Outstanding | shares 114,246,393 113,844,267    
Number of Real Estate Properties | Communitie 299      
Development and capital improvements in progress $ 116,424 $ 59,506    
Number of States in which Entity Operates | State 16      
Consolidated assets $ 11,230,450 11,323,781    
Consolidated liabilities 4,926,860 4,942,178    
Advertising expenses 20,800 20,200 $ 18,800  
Lease Intangibles, Gross 13,864,159 13,598,550    
Operating Lease, Right-of-Use Asset 54,300      
Operating Lease, Liability $ 33,119      
Operating Lease, Weighted Average Remaining Lease Term       33 years
Operating Lease, Weighted Average Discount Rate, Percent 4.40%      
Percentage Of Rental Revenue From Leasing Of Apartment Homes 93.00%      
Percentage Of Reimbursable Revenue From Leasing Of Apartment Homes 6.00%      
Percentage of Rental Revenue and Other Income From Non-leasing Activities 1.00%      
Accounting Standards Update 2016-02        
Real Estate Properties [Line Items]        
Operating Lease, Right-of-Use Asset $ 53,800      
Operating Lease, Liability $ 33,600      
Operating Lease, Weighted Average Remaining Lease Term 32 years      
Accrued Liabilities [Member]        
Real Estate Properties [Line Items]        
Dividends Payable $ 118,300 113,200    
Accrued Real Estate Taxes 131,900 123,500    
Unearned Income 42,000 41,100    
Loss Contingency, Loss in Period 8,600 8,700    
Security Deposit Liability 19,400 18,700    
Interest Payable $ 21,400 15,100    
Furniture, Fixtures And Equipment        
Real Estate Properties [Line Items]        
Equipment, Useful Life 5 years      
Leases, Acquired-in-Place        
Real Estate Properties [Line Items]        
Lease Intangibles, Gross $ 2,600 3,900    
Parent Company        
Real Estate Properties [Line Items]        
Capitalized Development Costs, Period 6,500 4,200 $ 11,000  
Real Estate        
Real Estate Properties [Line Items]        
Cash proceeds 10,900      
Real Estate Investments, Joint Ventures 8,200      
Real Estate | Other Assets [Member]        
Real Estate Properties [Line Items]        
Real Estate Investments, Joint Ventures 13,100 3,800    
Real Estate | Post Massachusetts Avenue        
Real Estate Properties [Line Items]        
Real Estate Investments, Joint Ventures 43,700 44,200    
Real Estate | Variable Interest Entity Primary Beneficiary [Member]        
Real Estate Properties [Line Items]        
Consolidated assets 46,000 85,700    
Consolidated liabilities $ 3,200 $ 1,300    
Minimum [Member]        
Real Estate Properties [Line Items]        
Percentage of ownership interests of all consolidated subsidiaries (percent) 80.00%      
Minimum [Member] | Land Improvements And Buildings        
Real Estate Properties [Line Items]        
Equipment, Useful Life 8 years      
Maximum [Member]        
Real Estate Properties [Line Items]        
Percentage of ownership interests of all consolidated subsidiaries (percent) 100.00%      
Maximum [Member] | Accounting Standards Update 2016-02        
Real Estate Properties [Line Items]        
Operating lease, term of contract 1 year      
Maximum [Member] | Land Improvements And Buildings        
Real Estate Properties [Line Items]        
Equipment, Useful Life 40 years      
Development Properties        
Real Estate Properties [Line Items]        
Number of Real Estate Properties | Communitie 7      
Number of units under development community | Property 2,108      
Development Properties | Expected Costs        
Real Estate Properties [Line Items]        
Development and capital improvements in progress $ 489,500      
Development Properties | Costs Incurred To Date        
Real Estate Properties [Line Items]        
Development and capital improvements in progress $ 143,900      
Retail        
Real Estate Properties [Line Items]        
Number of Real Estate Properties | Property 32      
Square footage of real estate property | ft² 630,000      
Commercial Real Estate [Member]        
Real Estate Properties [Line Items]        
Number of Real Estate Properties | Property 4      
Square footage of real estate property | ft² 260,000      
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 96.60% 96.50%