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Segment Information - Additional Information (Detail) individual in Millions | 6 Months Ended
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Jun. 30, 2017 Property States individual
Segment Reporting Information [Line Items] |
Number of owned or owned interests of apartment communities | Property | 305
Number of states in which apartment units are located | States | 16
Period properties owned and stabilized | 12 months
Occupancy Level for Stabilized Communities | 90.00%
Period Properties Stabilized | 90 days
Large Market Same Store [Member] |
Segment Reporting Information [Line Items] |
Apartment Community Population | 1
Percentage of Total Public Multifamily REIT Units | 1.00%
Period properties owned and stabilized | 12 months
Secondary Market Same Store [Member] |
Segment Reporting Information [Line Items] |
Apartment Community Population | 1
Percentage of Total Public Multifamily REIT Units | 1.00%
Period properties owned and stabilized | 12 months
Non Same Store And Other [Member] |
Segment Reporting Information [Line Items] |
Percentage of Total Public Multifamily REIT Units | 1.00%

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- Definition Apartment Community Population + References No definition available. + Details
Name: | maa_ApartmentCommunityPopulation
Namespace Prefix: | maa_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Occupancy Level for Stabilized Communities + References No definition available. + Details
Name: | maa_OccupancyLevelforStabilizedCommunities
Namespace Prefix: | maa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage of Total Public Multifamily REIT Units + References No definition available. + Details
Name: | maa_PercentageOfTotalPublicMultifamilyReitUnits
Namespace Prefix: | maa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Period properties owned and stabilized + References No definition available. + Details
Name: | maa_PeriodPropertiesOwnedAndStabilized
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
Name: | maa_PeriodPropertiesStabilized
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 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
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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: |