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Partners' Capital of Mid-America Apartments, L.P. (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Schedule of Capital Structure [Line Items] |  |
Operating partnership units outstanding | 117,827,046 | 79,685,786
General Partners' Capital Account, Units Outstanding | 113,627,014 | 75,542,583
Limited Liability (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest | 96.40% |
Percentage Of Ownership Interests | 100.00% |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest |  | 94.80%
Limited Partners' Capital Account, Units Outstanding | 4,200,032 |
Noncontrolling Interest [Member] |  |
Schedule of Capital Structure [Line Items] |  |
Common Shares Issuable Upon Conversion Of Convertible Stock | 4,200,032 | 4,143,203
Limited Partners' Capital Account | $ 448.9 | $ 389.4
Redeemable Capital Shares Par Or Stated Value Per Share | $ 106.88 | $ 93.99

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- Definition The number of general partner units outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
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