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Shareholders' Equity of MAA - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Equity [Line Items] |  |  |  |  |  |
Common stock, shares outstanding |  | 115,447,252 | 115,138,323 | 115,447,252 | 115,138,323 | 115,336,876
Total common shares and operating partnership units outstanding |  | 118,643,681 | 118,541,005 | 118,643,681 | 118,541,005 |
Proceeds from Stock Options Exercised, Net |  |  |  |  | $ 1.5 |
Equity Forward Sale Agreements [Member] |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 1,100,000 |  |  |  |  |
Common stock, price per share | $ 190.56 |  |  |  |  |
Common stock settlement under agreement | 0 |  |  |  |  |
Common shares attributable to dilutive effect of equity forward agreements |  |  |  | 17,000 |  |
At The Market Offering [Member] |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |
Common stock shares sold |  | 0 | 0 | 0 | 0 |
Remaining common stock to be issued |  |  |  | 4,000,000.0 |  |
Maximum [Member] | At The Market Offering [Member] |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  | 4,000,000.0 |  | 4,000,000.0 |  |
Equity Option [Member] |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 350 | 19,032 |
Noncontrolling Interest [Member] |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |
Common Shares Issuable Upon Conversion Of Convertible Stock |  | 3,196,429 | 3,402,682 | 3,196,429 | 3,402,682 |
Employee Stock Option [Member] |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |
Common stock shares, outstanding option |  | 463 | 813 | 463 | 813 |

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