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Legal Proceedings (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]    
Number of Units in Real Estate Property 81,976us-gaap_NumberOfUnitsInRealEstateProperty  
Loss Contingency Accrual $ 12.4us-gaap_LossContingencyAccrualAtCarryingValue $ 12.3us-gaap_LossContingencyAccrualAtCarryingValue
Regatta at James Island Litigation [Member]    
Loss Contingencies [Line Items]    
Number of Units in Real Estate Property 212us-gaap_NumberOfUnitsInRealEstateProperty
/ us-gaap_LitigationCaseAxis
= maa_RegattaatJamesIslandLitigationMember