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Partners' Capital of Mid-America Apartments, L.P. (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 01, 2016
Schedule of Capital Structure [Line Items] |  |  |
Operating partnership units outstanding | 118,021,379 | 117,886,987 |
General Partners' Capital Account, Units Outstanding | 113,916,208 | 113,745,207 |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest | 96.50% | 96.50% |
Limited Partners' Capital Account, Units Outstanding | 4,105,171 |  |
Noncontrolling Interest [Member] |  |  |
Schedule of Capital Structure [Line Items] |  |  |
Common Shares Issuable Upon Conversion Of Convertible Stock | 4,105,171 | 4,141,780 |
Limited Partners' Capital Account | $ 448.8 | $ 377.9 |
Redeemable Capital Shares Par Or Stated Value Per Share | $ 109.33 | $ 91.24 |
Redeemable Preferred Stock [Member] |  |  |
Schedule of Capital Structure [Line Items] |  |  |
Preferred Stock, Shares Outstanding |  |  | 867,846

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