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Organization and Summary of Significant Accounting Policies (Textual) (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) Properties Property State Community shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2023 Property | Dec. 31, 2022 Property
Real Estate Properties [Line Items] |  |  |  |  |
General Partners' Capital Account, Units Outstanding | shares | 115,336,876 | 114,373,727 |  |  |
Number of Real Estate Properties | Community | 290 |  |  |  |
Development and capital improvements in progress | $ 247,970 | $ 283,477 |  |  |
Number of States in which Entity Operates | State | 16 |  |  |  |
Other non-operating income | $ 33,902 | 4,857 | $ 22,999 |  |
Consolidated assets | 11,285,182 | 11,194,791 |  |  |
Consolidated liabilities | 5,101,090 | 5,090,986 |  |  |
Advertising expenses | 23,900 | 23,900 | 20,800 |  |
Lease Intangibles, Gross | 14,680,222 | 14,277,902 |  |  |
Real Estate Investments, Joint Ventures | $ 16,000 |  |  |  |
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% |  |  |  |
Operating Lease, Right-of-Use Asset | $ 47,000 | $ 49,400 |  |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other Assets | Other Assets |  |  |
Right-of-use Lease, Liability | $ 30,251 | $ 31,700 |  |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | Accrued expenses and other liabilities | Accrued expenses and other liabilities |  |  |
Operating Lease Weighted Average Remaining Lease Term | 32 years |  |  |  |
Operating Lease Weighted Average Discount Rate | 4.40% |  |  |  |
Other Assets [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Investments, Joint Ventures | $ 79,400 | $ 23,000 |  |  |
Accrued Liabilities [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Accrued dividends payable | 128,916 | 121,392 |  |  |
Accrued Real Estate Taxes | 144,326 | 140,615 |  |  |
Security deposits | 24,660 | 21,637 |  |  |
Interest Payable | 26,331 | 24,771 |  |  |
Operating Lease, Right-of-Use Asset | 30,251 | 31,740 |  |  |
Leases, Acquired-in-Place |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Lease Intangibles, Gross | 900 | 1,300 |  |  |
Parent Company |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Capitalized Development Costs, Period | 16,600 | 12,700 | 6,500 |  |
Real Estate [Member] | Post Massachusetts Avenue [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Investments, Joint Ventures | 42,800 | 43,300 |  |  |
Real Estate [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Consolidated assets | $ 252,800 |  |  |  |
Consolidated liabilities |  | $ 8,100 |  |  |
Minimum [Member] | Land Improvements And Buildings |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Equipment, Useful Life | 5 years |  |  |  |
Minimum [Member] | Furniture, Fixtures And Equipment |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Equipment, Useful Life | 3 years |  |  |  |
Maximum [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |
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 |  |  |  |
Maximum [Member] | Furniture, Fixtures And Equipment |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Equipment, Useful Life | 5 years |  |  |  |
Limited Partnership [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
General Partners' Capital Account, Units Outstanding | shares | 115,336,876 | 114,373,727 |  |  |
Number of Real Estate Properties | Property | 1 |  |  |  |
Development and capital improvements in progress | $ 247,970 | $ 283,477 |  |  |
Other non-operating income | 33,902 | 4,857 | $ 22,999 |  |
Consolidated assets | 11,285,182 | 11,194,791 |  |  |
Consolidated liabilities | 5,101,109 | 5,091,005 |  |  |
Lease Intangibles, Gross | 14,680,222 | 14,277,902 |  |  |
Limited Partnership [Member] | Real Estate [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Consolidated assets |  | $ 128,900 |  |  |
Consolidated liabilities | $ 15,900 |  |  |  |
Limited Partnership [Member] | Minimum [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Percentage of ownership interests of all consolidated subsidiaries (percent) | 80.00% |  |  |  |
Limited Partnership [Member] | Maximum [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Percentage of ownership interests of all consolidated subsidiaries (percent) | 100.00% |  |  |  |
Development Properties [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of Real Estate Properties | Community | 6 |  |  |  |
Number of units under development community | Properties | 2,021 |  |  |  |
Development Properties [Member] | Expected Costs |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Development and capital improvements in progress | $ 460,500 |  |  |  |
Development Properties [Member] | Costs Incurred To Date | Limited Partnership [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Development and capital improvements in progress | $ 273,700 |  |  |  |
Development Properties [Member] | Scenario Forecast [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of Real Estate Properties | Property |  |  |  | 3 | 3
Retail |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of Real Estate Properties | Property | 33 |  |  |  |
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 | 97.30% | 96.60% |  |  |

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