XML 17 R1.htm IDEA: XBRL DOCUMENT v3.19.2
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2019
Jul. 29, 2019
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Registrant Name MID AMERICA APARTMENT COMMUNITIES INC.,  
Entity Central Index Key 0000912595  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   114,044,489
Entity Shell Company false  
Entity Current Reporting Status Yes  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity File Number 001-12762  
Entity Tax Identification Number 621543819  
Entity Address, Address Line One 6815 Poplar Ave  
Entity Address, Address Line Two Suite 500  
Entity Address, City or Town Germantown  
Entity Address, State or Province TN  
Entity Address, Postal Zip Code 38138  
City Area Code 901  
Local Phone Number 682-6600  
Common Stock [Member]    
Document Information [Line Items]    
Trading Symbol MAA  
Cumulative Preferred Stock [Member]    
Document Information [Line Items]    
Trading Symbol MAA*I  
Limited Partner [Member]    
Document Information [Line Items]    
Entity Registrant Name MID-AMERICA APARTMENTS, L.P.  
Entity Central Index Key 0001581776  
Entity Filer Category Non-accelerated Filer  
Entity Shell Company false  
Entity Current Reporting Status Yes  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity File Number 333-190028-01  
Entity Tax Identification Number 621543816  
Entity Address, Address Line One 6815 Poplar Ave  
Entity Address, Address Line Two Suite 500  
Entity Address, City or Town Germantown  
Entity Address, State or Province TN  
Entity Address, Postal Zip Code 38138  
City Area Code 901  
Local Phone Number 682-6600