$MAA
MID AMERICA APARTMENT COMMUNITIES INC. Stock $maa

$maa Overview Financials Valuation SEC Filings Company Website

2012 Q4 Form 10-K Financial Statement

#000091259513000003 Filed on February 22, 2013

Income Statement

Concept	2012 Q4	2012	2011 Q4
Revenue	$118.3M	$446.5M	$101.5M
YoY Change	16.54%	15.8%	-1.86%
Cost Of Revenue	$39.50M	$161.1M	$52.00M
YoY Change	-24.04%	11.41%	5.26%
Gross Profit	$83.40M	$314.8M	$61.10M
YoY Change	36.5%	18.7%	13.15%
Gross Profit Margin	70.52%	70.5%	60.21%
Selling, General & Admin	$16.70M	$68.10M	$4.100M
YoY Change	307.32%	1.49%	17.14%
% of Gross Profit	20.02%	21.63%	6.71%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$34.50M	$120.3M	$31.80M
YoY Change	8.49%	10.16%	12.37%
% of Gross Profit	41.37%	38.22%	52.05%
Operating Expenses	$48.20M	$189.3M	$33.90M
YoY Change	42.18%	9.42%	10.06%
Operating Profit	$32.84M	$115.9M	$24.43M
YoY Change	34.42%	37.33%	5.31%
Interest Expense	$13.86M	$52.25M	$9.240M
YoY Change	50.02%	2.04%	-161.6%
% of Operating Profit	42.21%	45.09%	37.82%
Other Income/Expense, Net	$0.00	$318.0K	$100.0K
YoY Change	-100.0%	-53.85%
Pretax Income	$18.10M	$60.23M	$11.20M
YoY Change	61.61%	93.53%	60.0%
Income Tax	$800.0K	$800.0K	$0.00
% Of Pretax Income	4.42%	1.33%	0.0%
Net Earnings	$22.31M	$98.74M	$18.76M
YoY Change	18.92%	112.26%	171.86%
Net Earnings / Revenue	18.86%	22.11%	18.48%
Basic Earnings Per Share	$0.53	$2.56	$0.49
Diluted Earnings Per Share	$0.53	$2.56	$0.49
COMMON SHARES
Basic Shares Outstanding	42.27M shares	41.04M shares
Diluted Shares Outstanding		42.94M shares

Balance Sheet

Concept	2012 Q4	2012	2011 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$9.000M	$9.000M	$57.00M
YoY Change	-84.21%	-84.21%	23.91%
Cash & Equivalents	$9.075M	$9.000M	$57.32M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$9.000M	$9.000M	$57.00M
YoY Change	-84.21%	-84.21%	23.91%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.689B	$2.689B	$2.407B
YoY Change	11.72%	11.72%	16.45%
Goodwill	$4.106M		$4.106M
YoY Change	0.0%
Intangibles
YoY Change
Long-Term Investments	$5.000M	$5.000M	$17.00M
YoY Change	-70.59%	-70.59%	-5.56%
Other Assets	$15.00M	$15.00M	$16.00M
YoY Change	-6.25%	-6.25%	6.67%
Total Long-Term Assets	$2.742B	$2.742B	$2.265B
YoY Change	21.09%	10.88%	6.32%
TOTAL ASSETS
Total Short-Term Assets	$9.000M	$9.000M	$57.00M
Total Long-Term Assets	$2.742B	$2.742B	$2.265B
Total Assets	$2.751B	$2.751B	$2.322B
YoY Change	18.5%	8.74%	6.69%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$5.000M	$5.000M	$2.000M
YoY Change	150.0%	150.0%	0.0%
Accrued Expenses	$95.00M	$95.00M	$92.00M
YoY Change	3.26%	3.26%	24.32%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$107.0M	$107.0M	$100.0M
YoY Change	7.0%	7.0%	20.48%
LONG-TERM LIABILITIES
Long-Term Debt	$1.674B	$1.674B	$1.650B
YoY Change	1.45%	1.45%	10.0%
Other Long-Term Liabilities	$21.00M	$21.00M	$33.00M
YoY Change	-36.36%	-36.36%	-32.65%
Total Long-Term Liabilities	$1.695B	$1.695B	$1.683B
YoY Change	0.71%	0.71%	8.65%
TOTAL LIABILITIES
Total Short-Term Liabilities	$107.0M	$107.0M	$100.0M
Total Long-Term Liabilities	$1.695B	$1.695B	$1.683B
Total Liabilities	$1.801B	$1.832B	$1.775B
YoY Change	1.46%	1.33%	7.34%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$914.1M	$919.0M	$718.3M
YoY Change
Total Liabilities & Shareholders Equity	$2.751B	$2.751B	$2.322B
YoY Change	18.5%	8.74%	6.69%

Cashflow Statement

Concept	2012 Q4	2012	2011 Q4
OPERATING ACTIVITIES
Net Income	$22.31M	$98.74M	$18.76M
YoY Change	18.92%	112.26%	171.86%
Depreciation, Depletion And Amortization	$34.50M	$120.3M	$31.80M
YoY Change	8.49%	10.16%	12.37%
Cash From Operating Activities	$53.00M	$191.8M	$43.10M
YoY Change	22.97%	26.1%	59.04%
INVESTING ACTIVITIES
Capital Expenditures	-$31.50M	-$451.3M	-$133.8M
YoY Change	-76.46%	-3.09%	61.99%
Acquisitions
YoY Change
Other Investing Activities	$13.20M	$122.0M	$12.90M
YoY Change	2.33%	416.95%	-22.29%
Cash From Investing Activities	-$18.20M	-$303.3M	-$121.0M
YoY Change	-84.96%	-22.81%	83.33%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		-$194.3M
YoY Change		-16.66%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-39.10M	$63.21M	110.9M
YoY Change	-135.26%	-74.93%	-824.84%
NET CHANGE
Cash From Operating Activities	53.00M	$191.8M	43.10M
Cash From Investing Activities	-18.20M	-$303.3M	-121.0M
Cash From Financing Activities	-39.10M	$63.21M	110.9M
Net Change In Cash	-4.300M	-$48.27M	33.00M
YoY Change	-113.03%	-524.98%	-160.89%
FREE CASH FLOW
Cash From Operating Activities	$53.00M	$191.8M	$43.10M
Capital Expenditures	-$31.50M	-$451.3M	-$133.8M
Free Cash Flow	$84.50M	$643.1M	$176.9M
YoY Change	-52.23%	4.1%	61.26%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q4	us-gaap	Accounts Payable Current And Noncurrent AccountsPayableCurrentAndNoncurrent	4586000	USD
CY2011Q4	us-gaap	Accounts Payable Current And Noncurrent AccountsPayableCurrentAndNoncurrent	2091000	USD
CY2012Q4	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	94719000	USD
CY2011Q4	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	91718000	USD
CY2011Q4	us-gaap	Accumulated Distributions In Excess Of Net Income AccumulatedDistributionsInExcessOfNetIncome	621833000	USD
CY2012Q4	us-gaap	Accumulated Distributions In Excess Of Net Income AccumulatedDistributionsInExcessOfNetIncome	603315000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-35848000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-26054000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-48847000	USD
CY2009Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-47435000	USD
CY2010	us-gaap	Acquisition Costs AcquisitionCosts	808000	USD
CY2011	us-gaap	Acquisition Costs AcquisitionCosts	553000	USD
CY2012	us-gaap	Acquisition Costs AcquisitionCosts	346000	USD
CY2011Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1375623000	USD
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1542999000	USD
CY2010Q4	us-gaap	Advances To Affiliate AdvancesToAffiliate	0	USD
CY2011Q4	us-gaap	Advances To Affiliate AdvancesToAffiliate	0	USD
CY2012Q4	us-gaap	Advances To Affiliate AdvancesToAffiliate	0	USD
CY2010	us-gaap	Advertising Expense AdvertisingExpense	7200000	USD
CY2012	us-gaap	Advertising Expense AdvertisingExpense	8800000	USD
CY2011	us-gaap	Advertising Expense AdvertisingExpense	8700000	USD
CY2012	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-767000	USD
CY2011	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-360000	USD
CY2010	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-360000	USD
CY2010	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2627000	USD
CY2012	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3552000	USD
CY2011	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2902000	USD
CY2010	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1914000	USD
CY2011	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2012	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2012Q4	us-gaap	Assets Assets	2751068000	USD
CY2011Q4	us-gaap	Assets Assets	2530468000	USD
CY2011Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	2879289000	USD
CY2012Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	3170413000	USD
CY2012Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Purchase Price BusinessAcquisitionCostOfAcquiredEntityPurchasePrice	312000000	USD
CY2011	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	1.26
CY2012	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	2.56
CY2011	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	51468000	USD
CY2012	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	114690000	USD
CY2012	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	514278000	USD
CY2011	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	463779000	USD
CY2012	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	1581000	USD
CY2011	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	3319000	USD
CY2010	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2512000	USD
CY2012	us-gaap	Business Combination Pro Forma Information Earnings Or Loss Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual	3100000	USD
CY2012	us-gaap	Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	17600000	USD
CY2012Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Intangibles BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles	500000	USD
CY2012Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	317300000	USD
CY2010Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	1764000	USD
CY2012Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	3144000	USD
CY2011Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	3829000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	9075000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	57317000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	45942000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	13819000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	11375000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	32123000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-48242000	USD
CY2012Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.6600
CY2012Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.6600
CY2012Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.6600
CY2012Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.6600
CY2012	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	2.64
CY2011	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	2.51
CY2010	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	2.46
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.675
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.4725
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.5425
CY2011Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.6275
CY2011Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.6275
CY2011Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.6275
CY2011Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.6275
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	38959338	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	42316398	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	38959338	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	42316398	shares
CY2012Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	422000	USD
CY2011Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	389000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	61820000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	115017000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	28349000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	6510000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1008000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3038000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	121527000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	29357000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	64858000	USD
CY2012	us-gaap	Construction In Progress Expenditures Incurred But Not Yet Paid ConstructionInProgressExpendituresIncurredButNotYetPaid	3449000	USD
CY2011	us-gaap	Construction In Progress Expenditures Incurred But Not Yet Paid ConstructionInProgressExpendituresIncurredButNotYetPaid	8599000	USD
CY2010	us-gaap	Construction In Progress Expenditures Incurred But Not Yet Paid ConstructionInProgressExpendituresIncurredButNotYetPaid	3139000	USD
CY2011Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	53790000	USD
CY2012Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	52455000	USD
CY2012	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	3459000	USD
CY2012	us-gaap	Discontinued Operation Amount Of Other Income Loss From Disposition Of Discontinued Operation Net Of Tax DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationNetOfTax	48000	USD
CY2012	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	15957000	USD
CY2012	us-gaap	Debt Instrument Description Of Variable Rate Basis DebtInstrumentDescriptionOfVariableRateBasis	LIBOR
CY2012Q4	us-gaap	Debt Instrument Interest Rate Effective Percentage DebtInstrumentInterestRateEffectivePercentage	0.038
CY2012	us-gaap	Debt Instrument Maturity Date DebtInstrumentMaturityDate	2018-05-02
CY2012Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.038
CY2010	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	1266000	USD
CY2011	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	3069000	USD
CY2011	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	10328000	USD
CY2010	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	9558000	USD
CY2012	us-gaap	Cost Of Other Property Operating Expense CostOfOtherPropertyOperatingExpense	11163000	USD
CY2011	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	14656000	USD
CY2010	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	13760000	USD
CY2011Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	14680000	USD
CY2012Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	13842000	USD
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	597000	USD
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	668000	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	507000	USD
CY2011	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	0	USD
CY2012	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	-31000	USD
CY2010	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	0	USD
CY2011	us-gaap	Depreciation And Amortization DepreciationAndAmortization	110870000	USD
CY2010	us-gaap	Depreciation And Amortization DepreciationAndAmortization	98384000	USD
CY2012	us-gaap	Depreciation And Amortization DepreciationAndAmortization	126136000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	132195000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	119329000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	106692000	USD
CY2011	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-27639000	USD
CY2010	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-34021000	USD
CY2012	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-20113000	USD
CY2010	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	-269000	USD
CY2012	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	-39000	USD
CY2011	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	-195000	USD
CY2012	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Loss DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLoss	-66000	USD
CY2011	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Loss DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLoss	-24000	USD
CY2011	us-gaap	Discontinued Operation Amount Of Other Income Loss From Disposition Of Discontinued Operation Net Of Tax DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationNetOfTax	-12000	USD
CY2010	us-gaap	Discontinued Operation Amount Of Other Income Loss From Disposition Of Discontinued Operation Net Of Tax DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationNetOfTax	0	USD
CY2011	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	12799000	USD
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.37
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.31
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.56
CY2012	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	41635000	USD
CY2010	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	-2000	USD
CY2012Q4	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	3161000	USD
CY2012Q1	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	9429000	USD
CY2012Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	16092000	USD
CY2012Q2	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	12953000	USD
CY2011Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	4927000	USD
CY2011Q2	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2011Q1	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2011Q4	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	7872000	USD
CY2011	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	3625000	USD
CY2010	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	2051000	USD
CY2012	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	577000	USD
CY2012Q4	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	77000	USD
CY2012Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-451000	USD
CY2012Q1	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	484000	USD
CY2012Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	467000	USD
CY2011Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	806000	USD
CY2011Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	984000	USD
CY2011Q4	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	847000	USD
CY2011Q1	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	988000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	-11059000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	-4136000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	-10824000	USD
CY2012	us-gaap	Distribution Made To Member Or Limited Partner Distributions Declared Per Unit DistributionMadeToMemberOrLimitedPartnerDistributionsDeclaredPerUnit	2.675
CY2010	us-gaap	Distribution Made To Member Or Limited Partner Distributions Declared Per Unit DistributionMadeToMemberOrLimitedPartnerDistributionsDeclaredPerUnit	2.4725
CY2011	us-gaap	Distribution Made To Member Or Limited Partner Distributions Declared Per Unit DistributionMadeToMemberOrLimitedPartnerDistributionsDeclaredPerUnit	2.5425
CY2011	us-gaap	Dividends Common Stock DividendsCommonStock	95704000	USD
CY2012	us-gaap	Dividends Common Stock DividendsCommonStock	111445000	USD
CY2010	us-gaap	Dividends Common Stock DividendsCommonStock	81247000	USD
CY2011	us-gaap	Dividends Preferred Stock DividendsPreferredStock	0	USD
CY2010	us-gaap	Dividends Preferred Stock DividendsPreferredStock	6549000	USD
CY2012	us-gaap	Dividends Preferred Stock DividendsPreferredStock	0	USD
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.32
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.56
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.74
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.69
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.60
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.60
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.74
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.53
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.49
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.20
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.25
CY2011	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	18123000	USD
CY2010	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	12354000	USD
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.69
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.53
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.24
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.37
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.20
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.49
CY2012Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	12900000	USD
CY2012Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	198732	shares
CY2010	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-358000	USD
CY2011	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	14000	USD
CY2012	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	4146000	USD
CY2011Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	92170000	USD
CY2012Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	98044000	USD
CY2012	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	45000	USD
CY2010	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	0	USD
CY2011	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	1084000	USD
CY2010	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2012	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-654000	USD
CY2011	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-755000	USD
CY2011	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	0	USD
CY2012	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	0	USD
CY2010	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	752000	USD
CY2012	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	13762000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	4106000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	4106000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	67788000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	35412000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	29975000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	34819000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	67565000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	28826000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.58
CY2010	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.50
CY2011	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.90
CY2011	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.89
CY2012	us-gaap	Interest Expense InterestExpense	58751000	USD
CY2011	us-gaap	Interest Expense InterestExpense	57415000	USD
CY2010	us-gaap	Interest Expense InterestExpense	54632000	USD
CY2012Q1	us-gaap	Interest Expense InterestExpense	14110000	USD
CY2012Q3	us-gaap	Interest Expense InterestExpense	14698000	USD
CY2012Q2	us-gaap	Interest Expense InterestExpense	14170000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.57
CY2010	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.49
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	42260000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	2049000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	16412000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.07
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.42
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.98
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.07
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.42
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.99
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1149000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-593000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-223000	USD
CY2012Q2	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-67000	USD
CY2012Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-72000	USD
CY2012Q4	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-53000	USD
CY2012Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-31000	USD
CY2011Q4	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-63000	USD
CY2011Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-107000	USD
CY2011Q2	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-178000	USD
CY2011Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-245000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-593000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-223000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-1149000	USD
CY2012	us-gaap	Income Tax Examination Year S Under Examination IncomeTaxExaminationYearSUnderExamination	MAA’s tax years that remain subject to examination for U.S. federal purposes range from 2009 through 2011. Our tax years that remain open for state examination vary but range from 2008 through 2011.
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	265000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	2495000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	109000	USD
CY2012	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	4613000	USD
CY2010	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-649000	USD
CY2011	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	8596000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	5529000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1356000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1395000	USD
CY2010	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	953000	USD
CY2012	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-554000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-152000	USD
CY2011	us-gaap	Increase Decrease In Security Deposits IncreaseDecreaseInSecurityDeposits	-383000	USD
CY2010	us-gaap	Increase Decrease In Security Deposits IncreaseDecreaseInSecurityDeposits	-2095000	USD
CY2012	us-gaap	Increase Decrease In Security Deposits IncreaseDecreaseInSecurityDeposits	359000	USD
CY2011	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1156000	USD
CY2010	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	66000	USD
CY2012	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2318000	USD
CY2012Q4	us-gaap	Interest Expense InterestExpense	15773000	USD
CY2011Q1	us-gaap	Interest Expense InterestExpense	13653000	USD
CY2011Q4	us-gaap	Interest Expense InterestExpense	14734000	USD
CY2011Q2	us-gaap	Interest Expense InterestExpense	13845000	USD
CY2011Q3	us-gaap	Interest Expense InterestExpense	15183000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	59655000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	56596000	USD
CY2012	us-gaap	Interest Paid Net InterestPaidNet	60950000	USD
CY2011Q4	us-gaap	Interest Rate Cash Flow Hedge Asset At Fair Value InterestRateCashFlowHedgeAssetAtFairValue	975000	USD
CY2012Q4	us-gaap	Interest Rate Cash Flow Hedge Asset At Fair Value InterestRateCashFlowHedgeAssetAtFairValue	245000	USD
CY2012Q4	us-gaap	Interest Rate Cash Flow Hedge Liability At Fair Value InterestRateCashFlowHedgeLiabilityAtFairValue	21423000	USD
CY2011Q4	us-gaap	Interest Rate Cash Flow Hedge Liability At Fair Value InterestRateCashFlowHedgeLiabilityAtFairValue	33095000	USD
CY2012Q4	us-gaap	Interest Rate Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue	43000	USD
CY2011Q4	us-gaap	Interest Rate Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue	43000	USD
CY2011Q4	us-gaap	Interest Rate Derivative Instruments Not Designated As Hedging Instruments Liability At Fair Value InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue	0	USD
CY2012Q4	us-gaap	Interest Rate Derivative Instruments Not Designated As Hedging Instruments Liability At Fair Value InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue	0	USD
CY2012Q4	us-gaap	Inventory Real Estate Other InventoryRealEstateOther	8065000	USD
CY2011Q4	us-gaap	Inventory Real Estate Other InventoryRealEstateOther	8125000	USD
CY2011Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	17006000	USD
CY2012Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	4837000	USD
CY2010Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	17505000	USD
CY2012	us-gaap	Labor And Related Expense LaborAndRelatedExpense	57190000	USD
CY2011	us-gaap	Labor And Related Expense LaborAndRelatedExpense	51679000	USD
CY2010	us-gaap	Labor And Related Expense LaborAndRelatedExpense	47816000	USD
CY2012Q4	us-gaap	Land Land	386670000	USD
CY2011Q4	us-gaap	Land Land	333846000	USD
CY2011Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	1306000	USD
CY2012Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	1205000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	1782969000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	1801245000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2751068000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2530468000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	843900000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	6703000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	162444000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	88091000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	198429000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	374281000	USD
CY2010	us-gaap	Management Fees Base Revenue ManagementFeesBaseRevenue	680000	USD
CY2011	us-gaap	Management Fees Base Revenue ManagementFeesBaseRevenue	1017000	USD
CY2012	us-gaap	Management Fees Base Revenue ManagementFeesBaseRevenue	899000	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	25131000	USD
CY2012Q4	us-gaap	Minority Interest MinorityInterest	31058000	USD
CY2012	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	4873000	USD
CY2010	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	5641000	USD
CY2011	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	5103000	USD
CY2012	us-gaap	Minority Interest Period Increase Decrease MinorityInterestPeriodIncreaseDecrease	0	USD
CY2010	us-gaap	Minority Interest Period Increase Decrease MinorityInterestPeriodIncreaseDecrease	0	USD
CY2011	us-gaap	Minority Interest Period Increase Decrease MinorityInterestPeriodIncreaseDecrease	0	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	152600000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	281247000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	70014000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-442160000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-254271000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-329223000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	133794000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	210967000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	172288000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	105223000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	48821000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	29761000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	30866000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	28160000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	23890000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	22307000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	13791000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	7428000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	8844000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	18758000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1114000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	2410000	USD
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	4602000	USD
CY2012Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1312000	USD
CY2012Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1178000	USD
CY2012Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1212000	USD
CY2012Q4	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	900000	USD
CY2011Q4	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1187000	USD
CY2011Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	660000	USD
CY2011Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	311000	USD
CY2011Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	252000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	18063000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	48821000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	105223000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	30866000	USD
CY2012Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	23890000	USD
CY2012Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	28160000	USD
CY2012Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	22307000	USD
CY2011Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	7428000	USD
CY2011Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	8844000	USD
CY2011Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	18758000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	13791000	USD
CY2011	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	802000	USD
CY2010	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	903000	USD
CY2012	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	430000	USD
CY2010	us-gaap	Notes Assumed1 NotesAssumed1	0	USD
CY2012	us-gaap	Notes Assumed1 NotesAssumed1	30290000	USD
CY2011	us-gaap	Notes Assumed1 NotesAssumed1	0	USD
CY2012Q4	us-gaap	Notes Payable NotesPayable	1673848000	USD
CY2011Q4	us-gaap	Notes Payable NotesPayable	1649800000	USD
CY2012Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	166	Property
CY2012Q4	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	13	States
CY2010	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	261972000	USD
CY2012	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	329462000	USD
CY2011	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	293447000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	85265000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	130276000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	95217000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	31064000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	37285000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	31964000	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	29963000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	21603000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	24794000	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	26231000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	22589000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	9000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	10000	USD
CY2011	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	393142000	USD
CY2012	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	456202000	USD
CY2010	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	348522000	USD
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	15000	USD
CY2010	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	18000	USD
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	18000	USD
CY2012Q4	us-gaap	Other Assets OtherAssets	29166000	USD
CY2011Q4	us-gaap	Other Assets OtherAssets	29195000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	13627000	USD
CY2012	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	11702000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	-1518000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	106000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-1908000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-628000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1412000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9794000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	12999000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	-34021000	USD
CY2012	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	-20113000	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	-27639000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-14012000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-35539000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-8411000	USD
CY2011	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	31957000	USD
CY2010	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	26663000	USD
CY2012	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	34861000	USD
CY2012	us-gaap	Other Information Pertaining To Income Taxes OtherInformationPertainingToIncomeTaxes	No provision for federal income taxes has been made in the accompanying consolidated financial statements. MAA has made an election to be taxed as a Real Estate Investment Trust, or REIT, under Sections 856 through 860 of the Internal Revenue Code. As a REIT, MAA is generally not subject to federal income tax to the extent that we distribute 100% of our taxable income to our shareholders. We must meet certain requirements, including the requirement to distribute at least 90% of our taxable income, to maintain REIT status. If we fail to qualify as a REIT in any taxable year, MAA will be subject to the federal income tax (including any applicable alternative minimum tax) on our taxable income at regular corporate rates. Even though we qualify for taxation as a REIT, MAA may be subject to certain federal, state and local taxes on our income and property and to federal income and excise tax on our undistributed income
CY2011	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	36647000	USD
CY2012	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	40064000	USD
CY2010	us-gaap	Other Real Estate Revenue OtherRealEstateRevenue	30936000	USD
CY2012	us-gaap	Owned Property Management Costs OwnedPropertyManagementCosts	22084000	USD
CY2010	us-gaap	Owned Property Management Costs OwnedPropertyManagementCosts	18035000	USD
CY2011	us-gaap	Owned Property Management Costs OwnedPropertyManagementCosts	20700000	USD
CY2010	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	26505000	USD
CY2012	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	47222000	USD
CY2011	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	46947000	USD
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1990000	USD
CY2010	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1175000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2548000	USD
CY2012	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	0	USD
CY2010	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	155022000	USD
CY2011	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	0	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	77135000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	92028000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	107749000	USD
CY2012	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	4948000	USD
CY2010	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	5684000	USD
CY2011	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	5199000	USD
CY2011Q2	us-gaap	Profit Loss ProfitLoss	7680000	USD
CY2011Q3	us-gaap	Profit Loss ProfitLoss	14451000	USD
CY2011	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	0	USD
CY2010	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	7622000	USD
CY2012	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	0	USD
CY2012	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	3616000	USD
CY2011	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	4641000	USD
CY2010	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	7245000	USD
CY2012	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	218000	USD
CY2011	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	1510000	USD
CY2010	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	12130000	USD
CY2012	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	73991000	USD
CY2010	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	16394000	USD
CY2011	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	38153000	USD
CY2011	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	0	USD
CY2010	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	5149000	USD
CY2012	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	0	USD
CY2011	us-gaap	Proceeds From Distributions Received From Real Estate Partnerships ProceedsFromDistributionsReceivedFromRealEstatePartnerships	1402000	USD
CY2010	us-gaap	Proceeds From Distributions Received From Real Estate Partnerships ProceedsFromDistributionsReceivedFromRealEstatePartnerships	1735000	USD
CY2012	us-gaap	Proceeds From Distributions Received From Real Estate Partnerships ProceedsFromDistributionsReceivedFromRealEstatePartnerships	12164000	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	305526000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	196325000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	235741000	USD
CY2011	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	285350000	USD
CY2010	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	137881000	USD
CY2012	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	325000000	USD
CY2012	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-320064000	USD
CY2011	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-121533000	USD
CY2010	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-35000000	USD
CY2011	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	23663000	USD
CY2012	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	110101000	USD
CY2010	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	90335000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	51231000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	30875000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	109825000	USD
CY2012Q2	us-gaap	Profit Loss ProfitLoss	29472000	USD
CY2012Q3	us-gaap	Profit Loss ProfitLoss	32078000	USD
CY2012Q1	us-gaap	Profit Loss ProfitLoss	25068000	USD
CY2012Q4	us-gaap	Profit Loss ProfitLoss	23207000	USD
CY2011Q1	us-gaap	Profit Loss ProfitLoss	9155000	USD
CY2011Q4	us-gaap	Profit Loss ProfitLoss	19945000	USD
CY2010	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	101454000	USD
CY2012	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	124691000	USD
CY2011	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	112726000	USD
CY2010	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	989000	USD
CY2012	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	57344000	USD
CY2011	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	13503000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Accumulated Depreciation RealEstateAndAccumulatedDepreciationAccumulatedDepreciation	1040473000	USD
CY2010Q4	us-gaap	Real Estate And Accumulated Depreciation Accumulated Depreciation RealEstateAndAccumulatedDepreciationAccumulatedDepreciation	873903000	USD
CY2011Q4	us-gaap	Real Estate And Accumulated Depreciation Accumulated Depreciation RealEstateAndAccumulatedDepreciationAccumulatedDepreciation	973126000	USD
CY2009Q4	us-gaap	Real Estate And Accumulated Depreciation Accumulated Depreciation RealEstateAndAccumulatedDepreciationAccumulatedDepreciation	773438000	USD
CY2010Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	2941261000	USD
CY2012Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	3729706000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	3341832000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	387875000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfLandAndBuildingsAndImprovements	3729707000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	2571249000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	382275000	USD
CY2010	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	91798000	USD
CY2012	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	126066000	USD
CY2011	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	24953000	USD
CY2009Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	2698682000	USD
CY2011Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	3379929000	USD
CY2010	us-gaap	Real Estate Improvements RealEstateImprovements	-2577000	USD
CY2011	us-gaap	Real Estate Improvements RealEstateImprovements	-5190000	USD
CY2012	us-gaap	Real Estate Improvements RealEstateImprovements	-3636000	USD
CY2011Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	961724000	USD
CY2012Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	1027618000	USD
CY2011Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	3359095000	USD
CY2012Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	3707582000	USD
CY2011Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2397371000	USD
CY2012Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2679964000	USD
CY2012	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	344869000	USD
CY2011	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	362745000	USD
CY2010	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	278810000	USD
CY2010	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	379458000	USD
CY2011	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	429789000	USD
CY2012	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	496266000	USD
CY2011	us-gaap	Real Estate Taxes And Insurance RealEstateTaxesAndInsurance	48769000	USD
CY2010	us-gaap	Real Estate Taxes And Insurance RealEstateTaxesAndInsurance	43220000	USD
CY2012	us-gaap	Real Estate Taxes And Insurance RealEstateTaxesAndInsurance	56907000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	453226000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	540628000	USD
CY2010	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	1924000	USD
CY2012	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	12944000	USD
CY2011	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	13895000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	1362000	USD
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	808000	USD
CY2012	us-gaap	Revenues Revenues	497165000	USD
CY2011	us-gaap	Revenues Revenues	430806000	USD
CY2010	us-gaap	Revenues Revenues	380138000	USD
CY2012Q3	us-gaap	Revenues Revenues	127452000	USD
CY2012Q4	us-gaap	Revenues Revenues	131394000	USD
CY2012Q2	us-gaap	Revenues Revenues	122033000	USD
CY2012Q1	us-gaap	Revenues Revenues	116286000	USD
CY2011Q3	us-gaap	Revenues Revenues	110696000	USD
CY2011Q2	us-gaap	Revenues Revenues	105398000	USD
CY2011Q4	us-gaap	Revenues Revenues	113040000	USD
CY2011Q1	us-gaap	Revenues Revenues	101672000	USD
CY2012Q4	us-gaap	Tax Basis Of Investments Cost For Income Tax Purposes TaxBasisOfInvestmentsCostForIncomeTaxPurposes	3800000	USD
CY2012Q4	us-gaap	Temporary Equity Redemption Value TemporaryEquityRedemptionValue	4713000	USD
CY2011Q4	us-gaap	Temporary Equity Redemption Value TemporaryEquityRedemptionValue	4037000	USD
CY2012Q4	us-gaap	Temporary Equity Shares Outstanding TemporaryEquitySharesOutstanding	72786	shares
CY2011Q4	us-gaap	Temporary Equity Shares Outstanding TemporaryEquitySharesOutstanding	65771	shares
CY2011Q4	us-gaap	Secured Debt SecuredDebt	1514755000	USD
CY2012Q4	us-gaap	Secured Debt SecuredDebt	1190848000	USD
CY2012Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	6669000	USD
CY2011Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	6310000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	3013000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	2233000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	5519000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2012	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	0	shares
CY2012	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2010	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	1000	USD
CY2011	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2012	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	196326000	USD
CY2011	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	235334000	USD
CY2010	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	305344000	USD
CY2010	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	173000	USD
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	407000	USD
CY2010	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	1175000	USD
CY2012	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	1990000	USD
CY2011	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	2548000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	914052000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	718331000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	945110000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	743462000	USD
CY2012Q4	us-gaap	Unsecured Debt UnsecuredDebt	483000000	USD
CY2011Q4	us-gaap	Unsecured Debt UnsecuredDebt	135000000	USD
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Use of Estimates</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Management of MAA has made a number of estimates and assumptions relating to the reporting of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported amounts of revenues and expenses to prepare these financial statements and notes in conformity with U.S. generally accepted accounting principles. Actual results could differ from those estimates.</font></div></div>
CY2012	us-gaap	Utilities Costs UtilitiesCosts	27248000	USD
CY2011	us-gaap	Utilities Costs UtilitiesCosts	25188000	USD
CY2010	us-gaap	Utilities Costs UtilitiesCosts	22571000	USD
CY2011	us-gaap	Weighted Average General Partnership Units Outstanding WeightedAverageGeneralPartnershipUnitsOutstanding	1992000	shares
CY2012	us-gaap	Weighted Average General Partnership Units Outstanding WeightedAverageGeneralPartnershipUnitsOutstanding	1834000	shares
CY2010	us-gaap	Weighted Average General Partnership Units Outstanding WeightedAverageGeneralPartnershipUnitsOutstanding	0	shares
CY2010	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	121000	shares
CY2011	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	100000	shares
CY2012	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	64000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39087000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	42937000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	31977000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36995000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41039000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	31856000	shares
CY2010	maa	Fair Value Adjustment On Debt Assumed FairValueAdjustmentOnDebtAssumed	0	USD
CY2011	maa	Fair Value Adjustment On Debt Assumed FairValueAdjustmentOnDebtAssumed	0	USD
CY2012	maa	Fair Value Of Debt Assumed FairValueOfDebtAssumed	32000000	USD
CY2012	maa	Gain Loss From Insurance Settlement And Other GainLossFromInsuranceSettlementAndOther	-6000	USD
CY2010	maa	Gain Loss From Insurance Settlement And Other GainLossFromInsuranceSettlementAndOther	314000	USD
CY2011	maa	Gain Loss From Insurance Settlement And Other GainLossFromInsuranceSettlementAndOther	-619000	USD
CY2010	maa	Gain Loss From Insurance Settlement And Other Including Discontinued Operations GainLossFromInsuranceSettlementAndOtherIncludingDiscontinuedOperations	330000	USD
CY2012	maa	Gain Loss From Insurance Settlement And Other Including Discontinued Operations GainLossFromInsuranceSettlementAndOtherIncludingDiscontinuedOperations	42000	USD
CY2011	maa	Gain Loss From Insurance Settlement And Other Including Discontinued Operations GainLossFromInsuranceSettlementAndOtherIncludingDiscontinuedOperations	-619000	USD
CY2010	maa	Gain On Sale Of Non Depreciable Assets Including Discontinued Operations GainOnSaleOfNonDepreciableAssetsIncludingDiscontinuedOperations	0	USD
CY2011	maa	Gain On Sale Of Non Depreciable Assets Including Discontinued Operations GainOnSaleOfNonDepreciableAssetsIncludingDiscontinuedOperations	910000	USD
CY2012	maa	Gain On Sale Of Non Depreciable Assets Including Discontinued Operations GainOnSaleOfNonDepreciableAssetsIncludingDiscontinuedOperations	45000	USD
CY2011	maa	Gains Losses On Extinguishment Of Debt Including Discontinued Operations GainsLossesOnExtinguishmentOfDebtIncludingDiscontinuedOperations	-755000	USD
CY2012	maa	Gains Losses On Extinguishment Of Debt Including Discontinued Operations GainsLossesOnExtinguishmentOfDebtIncludingDiscontinuedOperations	-1012000	USD
CY2010	maa	Gains Losses On Extinguishment Of Debt Including Discontinued Operations GainsLossesOnExtinguishmentOfDebtIncludingDiscontinuedOperations	0	USD
CY2010	maa	Income From Continuing Operations Adjusted IncomeFromContinuingOperationsAdjusted	15754000	USD
CY2011	maa	Amortization Unearned Compensation AmortizationUnearnedCompensation	5519000	USD
CY2012	maa	Amortization Unearned Compensation AmortizationUnearnedCompensation	2233000	USD
CY2010	maa	Amortization Unearned Compensation AmortizationUnearnedCompensation	3005000	USD
CY2012Q4	maa	Apartment Community Population ApartmentCommunityPopulation	1000000	individual
CY2012Q4	maa	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Buildings And Improvements BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements	285600000	USD
CY2012Q4	maa	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Furniture Fixtures And Equipment BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFurnitureFixturesAndEquipment	600000	USD
CY2012Q4	maa	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Land BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand	58000000	USD
CY2012Q4	maa	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Liabilities Senior Notes BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesSeniorNotes	30300000	USD
CY2012Q4	maa	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Residential Leases Fair Value BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedResidentialLeasesFairValue	2900000	USD
CY2010	maa	Capital Gains Dividends Per Share CapitalGainsDividendsPerShare	0.00
CY2011	maa	Capital Gains Dividends Per Share CapitalGainsDividendsPerShare	0.33
CY2012	maa	Capital Gains Dividends Per Share CapitalGainsDividendsPerShare	0.48
CY2012Q4	maa	Contractual Commitments Future Minimum Payments Due Current ContractualCommitmentsFutureMinimumPaymentsDueCurrent	4100000	USD
CY2012Q4	maa	Contractual Commitments Future Minimum Payments Due In Two Years ContractualCommitmentsFutureMinimumPaymentsDueInTwoYears	1400000	USD
CY2012Q4	maa	Credit Risk Related Contingent Features Termination Value CreditRiskRelatedContingentFeaturesTerminationValue	20300000	USD
CY2011	maa	Derivative Interest Expense DerivativeInterestExpense	543000	USD
CY2010	maa	Derivative Interest Expense DerivativeInterestExpense	321000	USD
CY2012	maa	Derivative Interest Expense DerivativeInterestExpense	827000	USD
CY2012	maa	Effect On Retained Earnings Accumulated Deficit Due To Fair Value Option And Measurement EffectOnRetainedEarningsAccumulatedDeficitDueToFairValueOptionAndMeasurement	130000	USD
CY2011	maa	Effect On Retained Earnings Accumulated Deficit Due To Fair Value Option And Measurement EffectOnRetainedEarningsAccumulatedDeficitDueToFairValueOptionAndMeasurement	-71000	USD
CY2010	maa	Effect On Retained Earnings Accumulated Deficit Due To Fair Value Option And Measurement EffectOnRetainedEarningsAccumulatedDeficitDueToFairValueOptionAndMeasurement	844000	USD
CY2012	maa	Fair Value Adjustment On Debt Assumed FairValueAdjustmentOnDebtAssumed	2578000	USD
CY2012	maa	Income Loss From Discontinued Operations Net Of Tax Including Portion Attributable To Noncontrolling Interest Adjusted IncomeLossFromDiscontinuedOperationsNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAdjusted	42260000	USD
CY2011	maa	Income Loss From Discontinued Operations Net Of Tax Including Portion Attributable To Noncontrolling Interest Adjusted IncomeLossFromDiscontinuedOperationsNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAdjusted	16412000	USD
CY2010	maa	Income Loss From Discontinued Operations Net Of Tax Including Portion Attributable To Noncontrolling Interest Adjusted IncomeLossFromDiscontinuedOperationsNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAdjusted	2287000	USD
CY2010	maa	Income Loss From Equity Method Investments Net Of Dividends Or Distributions Gross IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributionsGross	-1149000	USD
CY2011	maa	Income Loss From Equity Method Investments Net Of Dividends Or Distributions Gross IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributionsGross	-607000	USD
CY2011	maa	Income From Continuing Operations Adjusted IncomeFromContinuingOperationsAdjusted	33059000	USD
CY2012	maa	Income From Continuing Operations Adjusted IncomeFromContinuingOperationsAdjusted	64761000	USD
CY2010	maa	Income From Discontinued Operations Adjusted IncomeFromDiscontinuedOperationsAdjusted	2301000	USD
CY2011	maa	Income From Discontinued Operations Adjusted IncomeFromDiscontinuedOperationsAdjusted	15521000	USD
CY2012	maa	Income From Discontinued Operations Adjusted IncomeFromDiscontinuedOperationsAdjusted	40437000	USD
CY2012	maa	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest Adjusted IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterestAdjusted	67565000	USD
CY2011	maa	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest Adjusted IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterestAdjusted	34819000	USD
CY2010	maa	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest Adjusted IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterestAdjusted	15776000	USD
CY2012	maa	Income Loss From Equity Method Investments Net Of Dividends Or Distributions Gross IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributionsGross	-223000	USD
CY2011	maa	Marked To Market Adjustment On Derivative Instruments MarkedToMarketAdjustmentOnDerivativeInstruments	13084000	USD
CY2010	maa	Marked To Market Adjustment On Derivative Instruments MarkedToMarketAdjustmentOnDerivativeInstruments	-1839000	USD
CY2012	maa	Marked To Market Adjustment On Derivative Instruments MarkedToMarketAdjustmentOnDerivativeInstruments	10875000	USD
CY2012Q4	maa	Minimum Percentage Of Taxable Income Distribution To Shareholders MinimumPercentageOfTaxableIncomeDistributionToShareholders	0.9
CY2010	maa	Net Income Attributable To Common Shareholders Adjusted NetIncomeAttributableToCommonShareholdersAdjusted	18055000	USD
CY2011	maa	Net Income Attributable To Common Shareholders Adjusted NetIncomeAttributableToCommonShareholdersAdjusted	48580000	USD
CY2012	maa	Net Income Attributable To Common Shareholders Adjusted NetIncomeAttributableToCommonShareholdersAdjusted	105198000	USD
CY2011	maa	Net Income Loss Attributable To Noncontrolling Interest Adjusted NetIncomeLossAttributableToNoncontrollingInterestAdjusted	2410000	USD
CY2012	maa	Net Income Loss Attributable To Noncontrolling Interest Adjusted NetIncomeLossAttributableToNoncontrollingInterestAdjusted	4602000	USD
CY2010	maa	Net Income Loss Attributable To Noncontrolling Interest Adjusted NetIncomeLossAttributableToNoncontrollingInterestAdjusted	0	USD
CY2012	maa	Number Of Properties Sold NumberOfPropertiesSold	9	Property
CY2011	maa	Number Of Properties Sold NumberOfPropertiesSold	2	Property
CY2012	maa	Number Of Units Acquired In Real Estate Property NumberOfUnitsAcquiredInRealEstateProperty	2452	Apartments
CY2012Q4	maa	Number Of Wholly Owned Real Estate Properties NumberOfWhollyOwnedRealEstateProperties	160	Communities
CY2010	maa	Operating Income Before Depreciation OperatingIncomeBeforeDepreciation	226929000	USD
CY2012	maa	Operating Income Before Depreciation OperatingIncomeBeforeDepreciation	297076000	USD
CY2011	maa	Operating Income Before Depreciation OperatingIncomeBeforeDepreciation	258036000	USD
CY2012Q4	maa	Operating Leases Future Minimum Payments Due Thereafter Net OperatingLeasesFutureMinimumPaymentsDueThereafterNet	19000	USD
CY2011	maa	Ordinary Income Dividends Per Share OrdinaryIncomeDividendsPerShare	1.90
CY2012	maa	Ordinary Income Dividends Per Share OrdinaryIncomeDividendsPerShare	2.16
CY2010	maa	Ordinary Income Dividends Per Share OrdinaryIncomeDividendsPerShare	1.64
CY2011	maa	Return Of Capital Dividends Per Share ReturnOfCapitalDividendsPerShare	0.28
CY2011	maa	Revenues Adjusted RevenuesAdjusted	430806000	USD
CY2010	maa	Revenues Adjusted RevenuesAdjusted	398005000	USD
CY2012	maa	Revenues Adjusted RevenuesAdjusted	497165000	USD
CY2012	maa	Period Properties Owned And Stabilized PeriodPropertiesOwnedAndStabilized	P12M
CY2012	maa	Payments To Acquire Real Estate And Other Assets PaymentsToAcquireRealEstateAndOtherAssets	312001000	USD
CY2011	maa	Payments To Acquire Real Estate And Other Assets PaymentsToAcquireRealEstateAndOtherAssets	362745000	USD
CY2010	maa	Payments To Acquire Real Estate And Other Assets PaymentsToAcquireRealEstateAndOtherAssets	278810000	USD
CY2012Q4	maa	Percentage Collateral To Loans PercentageCollateralToLoans	1
CY2012Q4	maa	Percentage Of Total Public Multifamily Reit Units PercentageOfTotalPublicMultifamilyReitUnits	0.01
CY2012	maa	Prior Period Error Adjustment PriorPeriodErrorAdjustment	0	USD
CY2010	maa	Proceeds From Distributions Received From Real Estate Partnerships Gross ProceedsFromDistributionsReceivedFromRealEstatePartnershipsGross	1735000	USD
CY2011	maa	Proceeds From Distributions Received From Real Estate Partnerships Gross ProceedsFromDistributionsReceivedFromRealEstatePartnershipsGross	1402000	USD
CY2012	maa	Proceeds From Distributions Received From Real Estate Partnerships Gross ProceedsFromDistributionsReceivedFromRealEstatePartnershipsGross	12350000	USD
CY2012Q4	maa	Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements Net RealEstateAndAccumulatedDepreciationCarryingAmountOfLandAndBuildingsAndImprovementsNet	2689234000	USD
CY2011Q4	maa	Real Estate Assets Net RealEstateAssetsNet	2423808000	USD
CY2012Q4	maa	Real Estate Assets Net RealEstateAssetsNet	2694071000	USD
CY2010	maa	Real Estate Improvements And Developments RealEstateImprovementsAndDevelopments	57331000	USD
CY2011	maa	Real Estate Improvements And Developments RealEstateImprovementsAndDevelopments	104705000	USD
CY2012	maa	Real Estate Improvements And Developments RealEstateImprovementsAndDevelopments	134118000	USD
CY2011	maa	Real Estate Revenue Net Adjusted RealEstateRevenueNetAdjusted	429789000	USD
CY2010	maa	Real Estate Revenue Net Adjusted RealEstateRevenueNetAdjusted	397325000	USD
CY2012	maa	Real Estate Revenue Net Adjusted RealEstateRevenueNetAdjusted	496266000	USD
CY2012	maa	Reclassification Adjustment ReclassificationAdjustment	1300000	USD
CY2011	maa	Reclassification Of Redeemable Stock From Equity To Liabilities ReclassificationOfRedeemableStockFromEquityToLiabilities	152000	USD
CY2012	maa	Reclassification Of Redeemable Stock From Equity To Liabilities ReclassificationOfRedeemableStockFromEquityToLiabilities	0	USD
CY2010	maa	Reclassification Of Redeemable Stock From Equity To Liabilities ReclassificationOfRedeemableStockFromEquityToLiabilities	272000	USD
CY2012	maa	Redeemable Stock Issued RedeemableStockIssued	546000	USD
CY2010	maa	Redeemable Stock Issued RedeemableStockIssued	387000	USD
CY2011	maa	Redeemable Stock Issued RedeemableStockIssued	494000	USD
CY2010	maa	Redemption Of Preferred Stock RedemptionOfPreferredStock	155022000	USD
CY2010	maa	Renovations To Existing Real Estate Assets RenovationsToExistingRealEstateAssets	9925000	USD
CY2011	maa	Renovations To Existing Real Estate Assets RenovationsToExistingRealEstateAssets	12680000	USD
CY2012	maa	Renovations To Existing Real Estate Assets RenovationsToExistingRealEstateAssets	14420000	USD
CY2010	maa	Return Of Capital Dividends Per Share ReturnOfCapitalDividendsPerShare	0.82
CY2012	maa	Return Of Capital Dividends Per Share ReturnOfCapitalDividendsPerShare	0.00
CY2011	maa	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Liabilities Settled Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsLiabilitiesSettledTotalFairValue	0	USD
CY2010	maa	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Liabilities Settled Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsLiabilitiesSettledTotalFairValue	0	USD
CY2011	maa	Shares Reclassified To Liabilities SharesReclassifiedToLiabilities	0	USD
CY2010	maa	Shares Reclassified To Liabilities SharesReclassifiedToLiabilities	0	USD
CY2012Q1	maa	Shares Sold On Underwritten Public Offering SharesSoldOnUnderwrittenPublicOffering	1955000	shares
CY2012Q4	maa	Taxable Income Distribution Not To Be Subject To Federal Income Tax TaxableIncomeDistributionNotToBeSubjectToFederalIncomeTax	1
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0000912595
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	42351885	shares
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012Q2	dei	Entity Public Float EntityPublicFloat	2784477789	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	MID AMERICA APARTMENT COMMUNITIES INC
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012	dei	Trading Symbol TradingSymbol	MAA

Files In Submission

Name	View Source	Status
0000912595-13-000003-index-headers.html	Edgar Link	pending
0000912595-13-000003-index.html	Edgar Link	pending
0000912595-13-000003.txt	Edgar Link	pending
0000912595-13-000003-xbrl.zip	Edgar Link	pending
exhibit211.htm	Edgar Link	pending
exhibit231consentofey.htm	Edgar Link	pending
exhibit232consentofindepen.htm	Edgar Link	pending
exhibit311.htm	Edgar Link	pending
exhibit312.htm	Edgar Link	pending
exhibit321.htm	Edgar Link	pending
exhibit322.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
maa-20121231.xml	Edgar Link	completed
maa-20121231.xsd	Edgar Link	pending
maa-20121231_cal.xml	Edgar Link	unprocessable
maa-20121231_def.xml	Edgar Link	unprocessable
maa-20121231_lab.xml	Edgar Link	unprocessable
maa-20121231_pre.xml	Edgar Link	unprocessable
maa12312012-10k.htm	Edgar Link	pending
maa1231201210kchart.jpg	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$MAA
MID AMERICA APARTMENT COMMUNITIES INC. Stock $maa

2012 Q4 Form 10-K Financial Statement

#000091259513000003 Filed on February 22, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MAA MID AMERICA APARTMENT COMMUNITIES INC. Stock $maa

2012 Q4 Form 10-K Financial Statement

#000091259513000003 Filed on February 22, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MAA
MID AMERICA APARTMENT COMMUNITIES INC. Stock $maa