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MAALP Capital - Summary of Changes in Total Capital and its Components (Parenthetical) (Details) - $ / shares | 3 Months Ended
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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_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |