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MAALP Capital - Summary of Changes in Total Capital and its Components (Parenthetical) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
M A A L P | Limited Partner [Member]
Capital Disclosure [Line Items]
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 1.0250	$ 1.0000

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- Definition

[Line Items] for Capital Disclosure [Table]

+ References

No definition available.

+ Details

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Namespace Prefix:	maa_
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- Definition

Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

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- Details

Name:	srt_ConsolidatedEntitiesAxis=maa_MAALPMember
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- Details

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