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Percentage Of Ownership Interests

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Percentage Of Reimbursable Revenue From Leasing Of Apartment Homes

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Percentage of our total property revenues and total non-property income from leasing of apartment homes, excluding income on deferred compensation plans.

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Percentage of Rental Revenue and Other Income From Non-leasing Activities

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Amount of asset recognized for present right to economic benefit.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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The number of general partner units outstanding.

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Amount of expenses related to the generation of investment income.

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Organization and Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) ApartmentUnits Property State Community shares	Mar. 31, 2025 USD ($) shares	Dec. 31, 2028 Property	Dec. 31, 2027 Property	Dec. 31, 2025 USD ($) shares
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding \| shares	116,353,152	116,916,381
Number of Real Estate Properties \| Community	294
Number of units under development community \| ApartmentUnits	1,788
Development and capital improvements in progress	$ 369,883				$ 426,759
Number of States in which Entity Operates \| State	16
Consolidated assets	$ 11,994,502				11,975,383
Consolidated liabilities	6,286,006				$ 6,135,738
Real Estate Investments, Joint Ventures	$ 20,000
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%
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	$ 37,300				$ 38,000
Right-of-use Lease, Liability	23,831				24,300
Marketable equity securities	2,900				3,900
Marketable Equity Securities [Member]
Real Estate Properties [Line Items]
Unrealized gains (losses)		$ (1,000)
Limited Partnership [Member]
Real Estate Properties [Line Items]
Investment Expense	22,900	$ 1,700
Other Assets [Member]
Real Estate Properties [Line Items]
Real Estate Investments, Joint Ventures	101,800				78,200
Real Estate [Member]
Real Estate Properties [Line Items]
Proceeds from (Payments to) Noncontrolling Interests	11,000
Real Estate [Member] \| Post Massachusetts Avenue [Member]
Real Estate Properties [Line Items]
Real Estate Investments, Joint Ventures	$ 41,600				$ 41,300
Maximum [Member] \| Accounting Standards Update 2016-02 [Member]
Real Estate Properties [Line Items]
Operating lease, term of contract	1 year
Development Properties [Member] \| Scenario Forecast [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties \| Property			2	1
Retail [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties \| Property	37
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	97.50%	97.40%
Limited Partnership [Member]
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding \| shares	116,353,152				116,878,077
Number of Real Estate Properties \| Property	1
Development and capital improvements in progress	$ 369,883				$ 426,759
Consolidated assets	11,994,502				11,975,383
Consolidated liabilities	6,286,025				6,135,757
Limited Partnership [Member] \| Real Estate [Member] \| Variable Interest Entity Primary Beneficiary [Member]
Real Estate Properties [Line Items]
Consolidated assets	379,200				386,400
Consolidated liabilities	$ 15,100				$ 16,700
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	$ 388,300