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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property operating expenses:      
Business Combination, Merger and Integration Related Expenses   $ 40,800  
Preferred Stock Dividends, Income Statement Impact     $ 0
Parent Company [Member]      
Operating revenues:      
Total operating revenues $ 1,528,987 1,125,348 1,042,779
Property operating expenses:      
Operating Expenses 364,190 280,572 271,027
Real estate taxes and insurance 212,541 142,784 129,618
Depreciation and amortization 493,708 322,958 294,520
Total property operating expenses 1,070,439 746,314 695,165
Other Cost and Expense, Operating 43,588 34,093 30,990
General and administrative expenses 40,194 29,040 25,716
Business Combination, Merger and Integration Related Expenses 19,990 40,823 0
Income from continuing operations before non-operating items 354,776 275,078 290,908
Interest expense (154,751) (129,947) (122,344)
Gain on sale of depreciable real estate assets excluded from discontinued operations 127,386 80,397 189,958
Gain on sale of non-depreciable real estate assets 21 2,171 172
Other Nonoperating Income (Expense) 14,353 (1,839) (6,274)
Income before income tax expense 341,785 225,860 352,420
Income tax expense (2,619) (1,699) (1,673)
Income from continuing operations before joint venture activity 339,166 224,161 350,747
Gain (loss) from real estate joint ventures 1,370 241 (2)
Consolidated net income 340,536 224,402 350,745
Net income attributable to noncontrolling interests 12,157 12,180 18,458
Net Income (Loss) Available to Shareholders 328,379 212,222 332,287
Preferred Stock Dividends, Income Statement Impact 3,688 307  
Net income available for MAA common shareholders $ 324,691 $ 211,915 $ 332,287
Earnings per share - diluted:      
Common Stock, Dividends, Per Share, Declared $ 3.5325 $ 3.3300 $ 3.1300
Limited Partner [Member]      
Operating revenues:      
Total operating revenues $ 1,528,987 $ 1,125,348 $ 1,042,779
Property operating expenses:      
Operating Expenses 364,190 280,572 271,027
Real estate taxes and insurance 212,541 142,784 129,618
Depreciation and amortization 493,708 322,958 294,520
Total property operating expenses 1,070,439 746,314 695,165
Other Cost and Expense, Operating 43,588 34,093 30,990
General and administrative expenses 40,194 29,040 25,716
Business Combination, Merger and Integration Related Expenses 19,990 40,823 0
Income from continuing operations before non-operating items 354,776 275,078 290,908
Interest expense (154,751) (129,947) (122,344)
Gain on sale of depreciable real estate assets excluded from discontinued operations 127,386 80,397 189,958
Gain on sale of non-depreciable real estate assets 21 2,171 172
Other Nonoperating Income (Expense) 14,353 (1,839) (6,274)
Income before income tax expense 341,785 225,860 352,420
Income tax expense (2,619) (1,699) (1,673)
Income from continuing operations before joint venture activity 339,166 224,161 350,747
Gain (loss) from real estate joint ventures 1,370 241 (2)
Consolidated net income 340,536 224,402 350,745
Preferred Stock Dividends, Income Statement Impact 3,688 307 0
Net income available for Mid-America Apartments, L.P. common unitholders $ 336,848 $ 224,095 $ 350,745
Earnings Per Share, Basic [Abstract]      
Basic Earnings Per Unit $ 2.86 $ 2.70 $ 4.41
Earnings per share - diluted:      
Net income available to common shareholders (dollars per share) 2.86 2.70 4.41
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 3.5325 $ 3.3300 $ 3.1300