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Percentage Of Ownership Interests

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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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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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- Details

Name:	srt_OwnershipAxis=maa_MAALPMember
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Data Type:	na
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Basis of Presentation and Principles of Consolidation and Significant Accounting Policies - Additional Information (Details)	9 Months Ended
	Sep. 30, 2021 USD ($) Properties Property State Community shares	Sep. 30, 2020 shares	Dec. 31, 2022 Property	Dec. 31, 2021 Property	Dec. 31, 2020 USD ($) Property shares
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding \| shares	115,138,323	114,369,812
Number of Real Estate Properties \| Community	296
Development and capital improvements in progress	$ 236,339,000				$ 283,477,000
Number of States in which Entity Operates \| State	16
Consolidated assets	$ 11,254,132,000				11,194,791,000
Consolidated liabilities	5,139,479,000				5,090,986,000
Real Estate Investments, Joint Ventures	18,700,000
Operating Lease, Right-of-Use Asset	47,700,000				49,400,000
Operating Lease, Liability	$ 30,718,000				31,700,000
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	$ 43,000,000.0				23,000,000.0
Real Estate [Member] \| Post Massachusetts Avenue [Member]
Real Estate Properties [Line Items]
Real Estate Investments, Joint Ventures	42,800,000				43,300
Real Estate [Member] \| Variable Interest Entity Primary Beneficiary [Member]
Real Estate Properties [Line Items]
Consolidated assets	218,800,000				128,900,000
Consolidated liabilities	$ 15,300,000				$ 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	115,138,323				114,373,727
Number of Real Estate Properties \| Property	1
Development and capital improvements in progress	$ 236,339,000				$ 283,477,000
Consolidated assets	11,254,132,000				11,194,791,000
Consolidated liabilities	$ 5,139,498,000				$ 5,091,005,000
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	8				3
Number of units under development community \| Properties	2,654
Development Properties [Member] \| Expected Costs
Real Estate Properties [Line Items]
Development and capital improvements in progress	$ 627,500,000
Development Properties [Member] \| Costs Incurred To Date
Real Estate Properties [Line Items]
Development and capital improvements in progress	$ 383,800
Development Properties [Member] \| Scenario Forecast [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties \| Property			3	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	97.10%	96.60%