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Subsequent Events - Additional Information (Details) $ in Thousands	1 Months Ended	9 Months Ended
	Oct. 31, 2019 USD ($) a	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Subsequent Event [Line Items]
Gain on sale of non-depreciable real estate assets | $		$ 9,260	$ 3,870
Subsequent Event [Member] | Orlando, FL
Subsequent Event [Line Items]
Area of land parcel | a	25
Subsequent Event [Member] | Gulf Shores Alabama [Member]
Subsequent Event [Line Items]
Area of land parcel | a	45
Gain on sale of non-depreciable real estate assets | $	$ 3,000

X

- Definition

Gain on sale of non-depreciable assets.

+ References

No definition available.

+ Details

Name:	maa_GainOnSaleOfNonDepreciableAssets
Namespace Prefix:	maa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Area of land held.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

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:	srt_StatementGeographicalAxis=maa_OrlandoFloridaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=maa_GulfShoresAlabamaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: