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Partners' Capital of Mid-America Apartments, L.P. (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Schedule of Capital Structure [Line Items] |  |
Operating partnership units outstanding | 79,667,188 | 79,534,989
General Partners' Capital Account, Units Outstanding | 75,505,025 | 75,345,023
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 | 4,162,163 | 4,189,966
Noncontrolling Interest [Member] |  |
Schedule of Capital Structure [Line Items] |  |
Common Shares Issuable Upon Conversion Of Convertible Stock | 4,162,163 | 4,189,966
Limited Partners' Capital Account | $ 425.4 | $ 323.8
Redeemable Capital Shares Par Or Stated Value Per Share | $ 102.21 | $ 77.27

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