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Real Estate Acquisitions and Dispositions - Additional Information (Detail) | Mar. 31, 2016 ft² a apartmentunits Apartments
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Business Acquisitions and Dispositions [Line Items] |
Number of Units in Real Estate Property | apartmentunits | 79,896
Cobblestone Square [Member] |
Business Acquisitions and Dispositions [Line Items] |
Number of Units in Real Estate Property | Apartments | 314
McKinney Land [Member] |
Business Acquisitions and Dispositions [Line Items] |
Square Footage of Real Estate Property | ft² | 30
Colonial Promenade Nord du Lac (Covington, LA) [Member] |
Business Acquisitions and Dispositions [Line Items] |
Square Footage of Real Estate Property | 295,447
Area of Land | 25

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- 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

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- Definition Area of a real estate property. + References No definition available. + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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

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