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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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Area of a real estate property.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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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Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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The number of real estate properties owned as of the balance sheet date.

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The number of states the entity operates in as of the balance sheet date.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of income (expense) related to nonoperating activities, classified as other.

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The book value of investments in real estate joint ventures including direct and indirect investments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Basis of Presentation and Principles of Consolidation and Significant Accounting Policies - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) ft² Property Community State shares	Sep. 30, 2019 USD ($) shares	Sep. 30, 2020 USD ($) ft² Property Community State shares	Sep. 30, 2019 USD ($) shares	Dec. 31, 2022 Property	Dec. 31, 2021 Property	Dec. 31, 2020 Property	Dec. 31, 2019 USD ($) shares
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding \| shares	114,369,812	114,065,859	114,369,812	114,065,859
Number of Real Estate Properties \| Community	299		299
Development and capital improvements in progress	$ 220,685		$ 220,685					$ 116,424
Number of States in which Entity Operates \| State	16		16
Other non-operating expense (income)	$ 242	$ 18,800	$ (13,647)	$ 23,494
Consolidated assets	11,128,704		11,128,704					11,230,450
Consolidated liabilities	4,995,608		4,995,608					4,926,860
Real Estate Investments, Joint Ventures	21,300		$ 21,300
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	50,100		$ 50,100					53,800
Operating Lease, Liability	$ 32,181		$ 32,181					33,100
Operating Lease, Weighted Average Remaining Lease Term	31 years		31 years
Operating Lease, Weighted Average Discount Rate, Percent	4.40%		4.40%
Other Assets [Member]
Real Estate Properties [Line Items]
Real Estate Investments, Joint Ventures	$ 21,300		$ 21,300					13,100
Real Estate \| Post Massachusetts Avenue [Member]
Real Estate Properties [Line Items]
Real Estate Investments, Joint Ventures	43,500		43,500					43,700
Real Estate \| Variable Interest Entity Primary Beneficiary [Member]
Real Estate Properties [Line Items]
Consolidated assets	96,000		96,000					46,000
Consolidated liabilities	$ 10,200		$ 10,200					$ 3,200
Previously Reported [Member] \| General and Administrative Expenses [Member]
Real Estate Properties [Line Items]
Other non-operating expense (income)		1,300		2,300
Minimum [Member]
Real Estate Properties [Line Items]
Percentage of ownership interests of all consolidated subsidiaries (percent)	80.00%		80.00%
Maximum [Member]
Real Estate Properties [Line Items]
Percentage of ownership interests of all consolidated subsidiaries (percent)	100.00%		100.00%
Maximum [Member] \| Accounting Standards Update 2016-02 [Member]
Real Estate Properties [Line Items]
Operating lease, term of contract	1 year		1 year
Limited Partner [Member]
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding \| shares	114,369,812		114,369,812					114,246,393
Number of Real Estate Properties \| Property	1		1
Development and capital improvements in progress	$ 220,685		$ 220,685					$ 116,424
Other non-operating expense (income)	242	$ 18,800	(13,647)	$ 23,494
Consolidated assets	11,128,704		11,128,704					11,230,450
Consolidated liabilities	$ 4,995,627		$ 4,995,627					$ 4,926,879
Limited Partner [Member] \| Minimum [Member]
Real Estate Properties [Line Items]
Percentage of ownership interests of all consolidated subsidiaries (percent)	80.00%		80.00%
Limited Partner [Member] \| Maximum [Member]
Real Estate Properties [Line Items]
Percentage of ownership interests of all consolidated subsidiaries (percent)	100.00%		100.00%
Development Properties
Real Estate Properties [Line Items]
Number of Real Estate Properties \| Community	6		6
Number of units under development community \| Property	1,940		1,940
Development Properties \| Expected Costs
Real Estate Properties [Line Items]
Development and capital improvements in progress	$ 459,500		$ 459,500
Development Properties \| Costs Incurred To Date
Real Estate Properties [Line Items]
Development and capital improvements in progress	$ 264,000		$ 264,000
Development Properties \| Scenario Forecast [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties \| Property					1	4	1
Retail
Real Estate Properties [Line Items]
Number of Real Estate Properties \| Property	32		32
Square Footage of Real Estate Property \| ft²	630,000		630,000
Commercial Real Estate [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties \| Property	4		4
Square Footage of Real Estate Property \| ft²	260,000		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%	96.60%