XML 35 R65.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

Real Estate Acquisitions and Dispositions - Schedule of Real Estate Asset Acquisitions and Dispositions (Parenthetical) (Details)	Dec. 31, 2019
Jefferson Sand Lake [Member]
Acquisitions and Disposals [Line Items]
Joint venture interest	95.00%
Novel Midtown [Member]
Acquisitions and Disposals [Line Items]
Joint venture interest	80.00%

X

- 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

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_OwnershipAxis=maa_JeffersonSandLakeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_OwnershipAxis=maa_NovelMidtownMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: