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Shareholders' Equity of MAA - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Preferred Stock, Shares Outstanding | 867,846 |  |
Preferred Stock, Liquidation Preference Per Share | $ 50.00 |  |
Preferred Stock, Redemption Date | Oct. 01, 2026 |  |
Preferred Stock, Redemption Price Per Share | $ 50.00 |  |
Common stock, shares outstanding | 113,627,014 | 75,542,583 |
Total common shares and operating partnership units outstanding | 117,827,046 | 79,685,786 |
Treasury Stock, Shares, Acquired | 47,956 | 19,727 |
Preferred Stock, Dividend Rate, Percentage | 8.50% |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount | $ 4.25 |  |
Preferred Stock, Liquidation Preference, Value | $ 43,400 |  |
Equity Option [Member] |  |  |
Stock Issued During Period, Shares, New Issues | 10,340 | 0 |
Noncontrolling Interest [Member] |  |  |
Common Shares Issuable Upon Conversion Of Convertible Stock | 4,200,032 | 4,143,203 |
Parent Company [Member] |  |  |
Preferred Stock, Shares Outstanding | 867,846 |  | 867,846
Preferred Stock, Liquidation Preference Per Share | $ 50 |  | $ 50
Common stock, shares outstanding | 113,627,014 |  | 113,518,212
Proceeds from Stock Options Exercised | $ 432 | $ 0 |
Employee Stock Option [Member] |  |  |
Common stock shares, outstanding option | 108,438 | 39,084 |

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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