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Organization and Summary of Significant Accounting Policies - Additional Information (Details) | 12 Months Ended |  |
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Dec. 31, 2023 USD ($) Properties Community Property State shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) | Dec. 31, 2025 Property | Dec. 31, 2024 Property
Real Estate Properties [Line Items] |  |  |  |  |
General Partners' Capital Account, Units Outstanding | shares | 116,694,124 | 115,480,336 |  |  |
Number of Real Estate Properties | Community | 290 |  |  |  |
Number of States in which Entity Operates | State | 16 |  |  |  |
Real estate investments joint ventures | $ 33,600,000 |  |  |  |
Development and capital improvements in progress | 385,405,000 | $ 332,035,000 |  |  |
Consolidated assets | 11,484,503,000 | 11,241,165,000 |  |  |
Consolidated liabilities | 5,185,381,000 | 5,030,746,000 |  |  |
Real Estate Investment Property, at Cost | 15,932,757,000 | 15,182,346,000 |  |  |
Investment Income | 2,900,000 | 10,000,000 |  |  |
Marketable equity securities received | 7,700,000 | 18,000,000 |  |  |
Marketable equity securities | $ 18,600,000 | 8,000,000 |  |  |
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% |  |  |  |
Advertising expenses | $ 26,600,000 | $ 24,400,000 | $ 23,900,000 |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position | Other assets | Other assets |  |  |
Operating Lease, Right-of-Use Asset | $ 42,500,000 | $ 44,600,000 |  |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | Accrued expenses and other liabilities | Accrued expenses and other liabilities |  |  |
Right-of-use lease, liabilities | $ 27,344,000 | $ 28,671,000 |  |  |
Leases, Acquired-in-Place |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Investment Property, at Cost | 1,600,000 | 800 |  |  |
Limited Partnerships [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Investment Income | 1,600,000 | 35,400,000 | 51,700,000 |  |
Real Estate [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Proceeds from (Payments to) Noncontrolling Interests, Total | 15,800,000 | 43,100,000 |  |  |
Real Estate [Member] | Post Massachusetts Avenue [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real estate investments joint ventures | 42,000,000 | 42,300,000 |  |  |
Other Assets [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real estate investments joint ventures | 46,500,000 | 36,700,000 |  |  |
Parent Company [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Capitalized Development Costs, Period | $ 20,600,000 | $ 14,400,000 | $ 16,600,000 |  |
Minimum [Member] | Land Improvements And Buildings |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Equipment, Useful Life | 5 years |  |  |  |
Minimum [Member] | Furniture and Fixtures |  |  |  |  |
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 and Fixtures |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Equipment, Useful Life | 5 years |  |  |  |
Development Properties [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of units under development community | Properties | 1,970 |  |  |  |
Development Properties [Member] | Forecast [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of Real Estate Properties | Property |  |  |  | 2 | 3
Retail [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of Real Estate Properties | Property |  |  |  | 34 |
Limited Partnership [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
General Partners' Capital Account, Units Outstanding | shares | 116,694,124 | 115,480,336 |  |  |
Number of Real Estate Properties | Property | 1 |  |  |  |
Development and capital improvements in progress | $ 385,405,000 | $ 332,035,000 |  |  |
Consolidated assets | 11,484,503,000 | 11,241,165,000 |  |  |
Consolidated liabilities | 5,185,400,000 | 5,030,765,000 |  |  |
Real Estate Investment Property, at Cost | 15,932,757,000 | 15,182,346,000 |  |  |
Limited Partnership [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Real Estate [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Consolidated assets | 265,100,000 | 279,600,000 |  |  |
Consolidated liabilities | $ 12,900,000 | $ 14,500,000 |  |  |
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% |  |  |  |
Limited Partnership [Member] | Development Properties [Member] | Costs Incurred To Date [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Development and capital improvements in progress | $ 391,600,000 |  |  |  |
M A A L P [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest | 97.40% | 97.30% |  |  |

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