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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

X

- 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: