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v3.19.1

Real Estate Acquisitions and Dispositions - Additional Information (Details) | Mar. 31, 2019 ft² a apartmentunits
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Novel Midtown [Member] |
Business Acquisitions and Dispositions [Line Items] |
Number of Units in Real Estate Property | apartmentunits | 345
Peachtree Road - outparcel [Member] |
Business Acquisitions and Dispositions [Line Items] |
Area of Land | a | 1
Poplar Avenue Office [Member] [Member] |
Business Acquisitions and Dispositions [Line Items] |
Square Footage of Real Estate Property | ft² | 42,000

X
- Definition Acquisitions and Disposals [Line Items] + References No definition available. + Details
Name: | maa_AcquisitionsandDisposalsLineItems
Namespace Prefix: | maa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of land held. + References No definition available. + Details
Name: | us-gaap_AreaOfLand
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | dei_LegalEntityAxis=maa_NovelMidtownMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=maa_PeachtreeRoadoutparcelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=maa_PoplarAvenueOfficeMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |