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v3.21.1

Basis of Presentation and Principles of Consolidation and Significant Accounting Policies - Additional Information (Details) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) Property Community State shares | Mar. 31, 2020 shares | Dec. 31, 2022 Property | Dec. 31, 2021 Property | Dec. 31, 2020 USD ($) Property shares
Real Estate Properties [Line Items] |  |  |  |  |
General Partners' Capital Account, Units Outstanding | shares | 114,408,949 | 114,279,662 |  |  |
Number of Real Estate Properties | Community | 299 |  |  |  |
Development and capital improvements in progress | $ 295,933 |  |  |  | $ 283,477
Number of States in which Entity Operates | State | 16 |  |  |  |
Consolidated assets | $ 11,192,378 |  |  |  | 11,194,791
Consolidated liabilities | 5,155,017 |  |  |  | 5,090,986
Real Estate Investments, Joint Ventures | $ 19,200 |  |  |  |
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 | $ 48,900 |  |  |  | 49,400
Operating Lease, Liability | $ 31,412 |  |  |  | 31,700
Operating Lease, Weighted Average Remaining Lease Term | 32 years |  |  |  |
Operating Lease, Weighted Average Discount Rate, Percent | 4.40% |  |  |  |
Other Assets [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Investments, Joint Ventures | $ 24,700 |  |  |  | 23,000
Real Estate [Member] | Post Massachusetts Avenue [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Investments, Joint Ventures | 43,200 |  |  |  | 43,300
Real Estate [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Consolidated assets | 148,200 |  |  |  | 128,900
Consolidated liabilities | $ 11,900 |  |  |  | $ 8,100
Minimum [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Percentage of ownership interests of all consolidated subsidiaries (percent) | 80.00% |  |  |  |
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 [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Operating lease, term of contract | 1 year |  |  |  |
Limited Partner [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
General Partners' Capital Account, Units Outstanding | shares | 114,408,949 |  |  |  | 114,373,727
Number of Real Estate Properties | Property | 1 |  |  |  |
Development and capital improvements in progress | $ 295,933 |  |  |  | $ 283,477
Consolidated assets | 11,192,378 |  |  |  | 11,194,791
Consolidated liabilities | $ 5,155,036 |  |  |  | $ 5,091,005
Limited Partner [Member] | Minimum [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Percentage of ownership interests of all consolidated subsidiaries (percent) | 80.00% |  |  |  |
Limited Partner [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 | 7 |  |  |  | 4
Number of units under development community | Property | 2,259 |  |  |  |
Development Properties [Member] | Expected Costs |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Development and capital improvements in progress | $ 528,000 |  |  |  |
Development Properties [Member] | Costs Incurred To Date |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Development and capital improvements in progress | $ 334,300 |  |  |  |
Development Properties [Member] | Scenario Forecast [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of Real Estate Properties | Property |  |  | 1 | 2 |
Retail |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of Real Estate Properties | Property | 32 |  |  |  |
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% | 96.60% |  |  |

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