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Partners' Capital of Mid-America Apartments, L.P. (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Mar. 31, 2015
Schedule of Capital Structure [Line Items] |  |  |
Operating partnership units outstanding | 79,683,089 | 79,561,396 |
General Partners' Capital Account, Units Outstanding | 75,524,086 | 75,375,027 |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest | 94.80% | 94.70% |
Limited Partners' Capital Account, Units Outstanding | 4,159,003 | 4,186,369 |
Noncontrolling Interest [Member] |  |  |
Schedule of Capital Structure [Line Items] |  |  |
Common Shares Issuable Upon Conversion Of Convertible Stock | 4,159,003 | 4,186,369 |
Limited Partners' Capital Account | $ 442.5 |  | $ 304.8
Redeemable Capital Shares Par Or Stated Value Per Share | $ 106.40 |  | $ 72.81

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