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v3.19.3

Segment Information - Revenues and NOI for Reportable Segment (Parenthetical) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Same Store [Member] |  |  |  |
Segment Information |  |  |  |
Reimbursable property revenues |  | $ 22,911 |  | $ 68,065
Non-Same Store and Other |  |  |  |
Segment Information |  |  |  |
Reimbursable property revenues |  | $ 1,003 |  | $ 2,733
Accounting Standards Update 2016-02 [Member] | Same Store [Member] |  |  |  |
Segment Information |  |  |  |
Reimbursable property revenues | $ 24,000 |  | $ 69,700 |
Accounting Standards Update 2016-02 [Member] | Non-Same Store and Other |  |  |  |
Segment Information |  |  |  |
Reimbursable property revenues | $ 1,100 |  | $ 3,200 |

X
- Definition The amount of revenue derived from managing real estate properties. + References No definition available. + Details
Name: | us-gaap_PropertyManagementFeeRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenuesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=maa_SameStoreMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=maa_NonSameStoreAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |