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Partners' Capital of Mid-America Apartments, L.P. (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Schedule of Capital Structure [Line Items] |  |
Operating partnership units outstanding | 117,823,412 | 79,683,089
General Partners' Capital Account, Units Outstanding | 113,607,734 | 75,524,086
Limited Liability (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest | 0.9642203707 |
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 | 4,215,678 |
Noncontrolling Interest [Member] |  |
Schedule of Capital Structure [Line Items] |  |
Common Shares Issuable Upon Conversion Of Convertible Stock | 4,215,678 | 4,159,003
Limited Partners' Capital Account | $ 444.2 | $ 442.5
Redeemable Capital Shares Par Or Stated Value Per Share | $ 105.38 | $ 106.40

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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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