XML 74 R57.htm IDEA: XBRL DOCUMENT v3.7.0.1

Real Estate Acquisitions and Dispositions - Additional Information (Detail)	Jul. 20, 2017 apartmentunits	Jul. 13, 2017 apartmentunits	Jun. 30, 2017 a apartmentunits
Colonial Grand at Lakewood Ranch [Member]
Business Acquisitions and Dispositions [Line Items]
Square Footage of Real Estate Property | a			12
Paddock Club Montgomery [Member]
Business Acquisitions and Dispositions [Line Items]
Square Footage of Real Estate Property | a			1
Charlotte at Midtown [Member]
Business Acquisitions and Dispositions [Line Items]
Number of Units in Real Estate Property			279
Subsequent Event [Member] | Paddock Club Lakeland [Member]
Business Acquisitions and Dispositions [Line Items]
Number of Units in Real Estate Property		464
Subsequent Event [Member] | Northwood [Member]
Business Acquisitions and Dispositions [Line Items]
Number of Units in Real Estate Property	270

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

Area of a real estate property.

+ References

No definition available.

+ Details

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

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

- Details

Name:	dei_LegalEntityAxis=maa_ColonialGrandAtLakewoodRanchMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=maa_PostAlexanderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=maa_CharlotteatMIdtownMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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_NorthwoodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: