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Discontinued Operations - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2015
Communities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Number Of Properties Sold 1maa_NumberOfPropertiesSold
Number of Units in Real Estate Property 81,976us-gaap_NumberOfUnitsInRealEstateProperty
Willow Creek  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Number of Units in Real Estate Property 285us-gaap_NumberOfUnitsInRealEstateProperty
/ us-gaap_InvestmentTypeAxis
= maa_WillowCreekMember
Colonial Promenade Nord du Lac  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Square Footage of Real Estate Property 195,536us-gaap_AreaOfRealEstateProperty
/ us-gaap_InvestmentTypeAxis
= maa_ColonialPromenadeNordDuLacCovingtonLaMember