XML 75 R58.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] $ in Millions | Jul. 17, 2017 USD ($) | Jul. 20, 2017 apartmentunits | Jul. 13, 2017 apartmentunits
--- | --- | --- | ---
Subsequent Event [Line Items] |  |  |
Repayments of Debt | $ | $ 150 |  |
Charlotte at MIdtown [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of Units in Real Estate Property |  |  | 464
Paddock Club Montgomery [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of Units in Real Estate Property |  | 208 |
Northwood [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of Units in Real Estate Property |  | 270 |

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
- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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