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Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] $ in Millions	Jul. 17, 2017 USD ($)	Jul. 20, 2017 apartmentunits	Jul. 13, 2017 apartmentunits
Subsequent Event [Line Items]
Repayments of Debt | $	$ 150
Charlotte at MIdtown [Member]
Subsequent Event [Line Items]
Number of Units in Real Estate Property			464
Paddock Club Montgomery [Member]
Subsequent Event [Line Items]
Number of Units in Real Estate Property		208
Northwood [Member]
Subsequent Event [Line Items]
Number of Units in Real Estate Property		270

X

- Definition

The number of units in a real estate property owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

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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:	dei_LegalEntityAxis=maa_PaddockClubLakelandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=maa_PaddockClubMontgomeryMember
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: