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Real Estate Acquisitions and Dispositions - Additional Information (Detail) | Mar. 31, 2017 Apartments
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Charlotte at Midtown [Member] |
Business Acquisitions and Dispositions [Line Items] |
Number of Units in Real Estate Property | 279

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- Definition Acquisitions and Disposals [Line Items] + 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 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

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