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v3.21.2

Segment Information - Additional Information (Details) | 9 Months Ended
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Sep. 30, 2021 Community State Segment
Segment Reporting Information [Line Items] |
Number of owned or owned interests of apartment communities | Community | 296
Number of States in which Entity Operates | 16
Number of reportable segments | Segment | 2
Period properties owned and stabilized | 12 months
Occupancy level for Stabilized Communities | 90.00%
Period Properties Stabilized | 90 days
Same Store [Member] |
Segment Reporting Information [Line Items] |
Period properties owned and stabilized | 12 months
Excluding Construction in Progress |
Segment Reporting Information [Line Items] |
Number of States in which Entity Operates | 15

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- Definition Occupancy level for stabilized communities. + References No definition available. + Details
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Namespace Prefix: | maa_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Period properties owned and stabilized + References No definition available. + Details
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Namespace Prefix: | maa_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Period Properties Stabilized + References No definition available. + Details
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Namespace Prefix: | maa_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition 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. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=maa_ExcludingConstructionInProgressMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |