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Partners' Capital of Mid-America Apartments, L.P. (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 01, 2016
Schedule of Capital Structure [Line Items] |  |  |
Operating partnership units outstanding | 117,952,415 | 117,827,046 |
General Partners' Capital Account, Units Outstanding | 113,838,139 | 113,627,014 |
Limited Liability (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest | 96.50% |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest |  | 96.40% |
Limited Partners' Capital Account, Units Outstanding | 4,114,276 |  |
Noncontrolling Interest [Member] |  |  |
Schedule of Capital Structure [Line Items] |  |  |
Common Shares Issuable Upon Conversion Of Convertible Stock | 4,114,276 | 4,200,032 |
Limited Partners' Capital Account | $ 412,168,169.68 | $ 448,899,420.16 |
Redeemable Capital Shares Par Or Stated Value Per Share | $ 100.18 | $ 106.88 |
Redeemable Preferred Stock [Member] |  |  |
Schedule of Capital Structure [Line Items] |  |  |
Preferred Stock, Shares Outstanding |  |  | 867,846

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