Entity Central Index Key Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing, equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases. Also includes amount of investment in certain other real estate investments not specifically identified elsewhere in the existing taxonomy. Real Estate Assets, Net Property operating expenses Gain (loss ) on sale of non depreciable real estate assets Income (Loss) from Continuing Operations before Equity Method Investments Gain on Sale of Non-Depreciable Assets The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures, and other related assets such as intangibles (in-place-leases) on it and so forth; includes real estate and other assets intended to generate income for the owner; excludes real estate acquired for use by the owner. Represents total operating revenues less property operating expenses, excluding depreciation. Business Combination, Merger and Integration Related Expenses Document document and entity information abstract. Document Document And Entity Information [Abstract] Document Information [Table] Document Information [Table] Partner Type Partner Type Of Partners Capital Account [Axis] Partner Type of Partners' Capital Account, Name Partner Type Of Partners Capital Account Name [Domain] Limited Partner [Member] Limited Partner [Member] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Common Stock [Member] Common Stock [Member] Cumulative Preferred Stock [Member] Cumulative Preferred Stock [Member] Document Information [Line Items] Document Information [Line Items] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Shell Company Entity Shell Company Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Interactive Data Current Entity Interactive Data Current Entity Well-known Seasoned Issuer Entity Well Known Seasoned Issuer Entity Public Float Entity Public Float Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity File Number Entity File Number Title of 12(b) Security Security12b Title Security Exchange Name Security Exchange Name Entity Incorporation, State or Country Code Entity Incorporation State Country Code Document Annual Report Document Annual Report Document Transition Report Document Transition Report Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address Address Line1 Entity Address, Address Line Two Entity Address Address Line2 Entity Address, City or Town Entity Address City Or Town Entity Address, State or Province Entity Address State Or Province Entity Address, Postal Zip Code Entity Address Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Undeveloped land. Parent LP stockholders equity Including portion attributable to noncontrolling Interest Liabilities and Capital Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Land Land Buildings and improvements and other Buildings Improvementsand Other Development and capital improvements in progress Construction In Progress Gross Real Estate Investment Property, at Cost Real Estate Investment Property At Cost Less: Accumulated depreciation Real Estate Investment Property Accumulated Depreciation Real Estate Investment Property, Net Real Estate Investment Property Net Undeveloped land Undeveloped Land Investment in real estate joint venture Investments In Affiliates Subsidiaries Associates And Joint Ventures Real estate assets, net Real Estate Assets Net Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Restricted cash Restricted Cash Other assets Other Assets Total assets Assets Liabilities and equity Liabilities And Stockholders Equity [Abstract] Liabilities: Liabilities [Abstract] Unsecured notes payable Unsecured Debt Secured notes payable Secured Debt Accrued expenses and other liabilities Accrued Liabilities Current And Noncurrent Total liabilities Liabilities Redeemable common stock Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests Shareholders' equity: Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] Preferred Stock, Value, Outstanding Preferred Stock Value Outstanding Common stock Common Stock Value Outstanding Additional paid-in capital Additional Paid In Capital Accumulated distributions in excess of net income Accumulated Distributions In Excess Of Net Income Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Total MAA shareholders' equity Stockholders Equity Noncontrolling interests - Operating Partnership units Minority Interest In Operating Partnerships Total Company's shareholders' equity Parent L P Stockholders Equity Including Portion Attributable To Noncontrolling Interest Noncontrolling interests - consolidated real estate entities Minority Interest In Joint Ventures Total equity Stockholders Equity Including Portion Attributable To Noncontrolling Interest Total liabilities and equity Liabilities And Stockholders Equity Common stock, par value per share Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Preferred Stock, Par or Stated Value Per Share Preferred Stock Par Or Stated Value Per Share Preferred Stock, Shares Authorized Preferred Stock Shares Authorized Preferred Stock, Dividend Rate, Percentage Preferred Stock Dividend Rate Percentage Preferred Stock, Shares Issued Preferred Stock Shares Issued Preferred Stock, Shares Outstanding Preferred Stock Shares Outstanding Preferred Stock, Liquidation Preference Per Share Preferred Stock Liquidation Preference Redeemable stock, shares issued and outstanding Temporary Equity Shares Outstanding Operating costs and expenses excluding depreciation and amortization. preferred unit dividend, income statement Net Income (Loss) Available to Common Unitholders, Basic Net Income (Loss) Available to Common Unit Holders Income Statement [Abstract] Revenues: Revenues [Abstract] Rental and other property revenues Revenues Expenses: Operating Costs And Expenses [Abstract] Operating expense, excluding real estate taxes and insurance Operating Costs And Expenses Excluding Depreciation And Amortization Real estate taxes and insurance Real Estate Taxes And Insurance Depreciation and amortization Depreciation And Amortization Total property operating expenses Property Operating Expenses Property management expenses Other Cost And Expense Operating General and administrative expenses General And Administrative Expense Merger and integration related expenses Business Combination Integration Related Costs Interest expense Interest Expense (Gain) loss on sale of depreciable real estate assets Gain Loss On Sale Of Property Plant Equipment Gain on sale of non-depreciable real estate assets Gain Loss On Sale Of Non Depreciable Real Estate Assets Other non-operating income Other Nonoperating Income Expense Income before income tax expense Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments Income tax expense Income Tax Expense Benefit Income from continuing operations before real estate joint venture activity Income Lossfrom Continuing Operationsbefore Equity Method Investments Income from real estate joint venture Income Loss From Equity Method Investments Net income Profit Loss Dividends to preferred unitholders Preferred Unit Dividends Income Statement Impact Net income available for MAALP common unitholders Net Income Loss Availableto Common Unitholders Basic Net income attributable to noncontrolling interests Net Income Loss Attributable To Noncontrolling Interest Net income available for shareholders Net Income Loss Dividends to MAA Series I preferred shareholders Preferred Stock Dividends Income Statement Impact Net income available for MAA common shareholders Net Income Loss Available To Common Stockholders Basic Earnings per common share - basic: Earnings Per Share Basic [Abstract] Net income available for MAA common shareholders Earnings Per Share Basic Earnings per common share - diluted: Earnings Per Share Diluted [Abstract] Net income available for MAA common shareholders Earnings Per Share Diluted Consolidated Statements of Comprehensive Income [Abstract] Consolidated Statements Of Comprehensive Income [Abstract] Net income Other comprehensive (loss) income: Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Unrealized (loss) gain from derivative instruments Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax Adjustment for net (gains) losses reclassified to net income from derivative instruments Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax Total comprehensive income Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Less: Comprehensive income attributable to noncontrolling interests Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest Comprehensive income Comprehensive Income Net Of Tax Issuance and registration of preferred shares. Stock Issued in Exchange for Redeemable Stock Fair value option and measurement. Acquisition of noncontrolling interests. Contributions from non controlling interest. Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Preferred Stock [Member] Preferred Stock [Member] Additional Paid-In Capital [Member] Additional Paid In Capital [Member] Accumulated Distributions in Excess Of Net Income [Member] Accumulated Distributions In Excess Of Net Income [Member] Accumulated Other Comprehensive (Loss) Income [Member] Accumulated Other Comprehensive Income [Member] Non controlling interests operating partnership [Member] Noncontrolling Interests Operating Partnership [Member] Noncontrolling Interests Operating Partnership [Member] Non controlling interest consolidated real estate entity [Member] Noncontrolling Interests-Consolidated Real Estate Entities [Member] Noncontrolling Interest Consolidated Real Estate Entity [Member] Temporary Equity [Member] Redeemable Common Stock [Member] Temporary Equity [Member] Partner Capital Components Partner Capital Components [Axis] Partner Capital Components Partner Capital Components [Domain] General Partner [Member] General Partner [Member] AOCI Attributable to Noncontrolling Interest [Member] Aoci Attributable To Noncontrolling Interest [Member] Beginning Balance Beginning Balance, Shares Shares Issued Net income Other comprehensive income - derivative instruments Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Issuance and registration of common shares Stock Issued During Period Value New Issues Issuance and registration of common shares, Shares Stock Issued During Period Shares New Issues Issuance and registration of preferred shares Preferred Share Issuance Shares repurchased and retired Stock Repurchased And Retired During Period Value Shares repurchased and retired, Shares Stock Repurchased And Retired During Period Shares Exercise of stock options Stock Issued During Period Value Stock Options Exercised Exercise of stock options, Shares Stock Issued During Period Shares Stock Options Exercised Shares issued in exchange for common units Stock Issued During Period Value Conversion Of Units Shares issued in exchange for common units, Shares Stock Issued During Period Shares Conversion Of Units Shares issued in exchange for redeemable stock Stock Issuedin Exchangefor Redeemable Stock Redeemable stock fair market value adjustment Effect On Retained Earnings Accumulated Deficit Due To Fair Value Option And Measurement Adjustment for noncontrolling interests in Operating Partnership Minority Interest Period Increase Decrease Cumulative adjustment due to adoption of ASU 2017-12 New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification Amortization of unearned compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Dividends on preferred stock Dividends Preferred Stock Dividends on common stock Dividends Common Stock Dividends on noncontrolling interests units Minority Interest Decrease From Distributions To Noncontrolling Interest Holders Acquisition of noncontrolling interest Acquisition Of Noncontrolling Interests Contributions From Non Controlling Interest Contributions From Non Controlling Interest Ending Balance Ending Balance, Shares Limited partners capital account member. Limited Partner [Member] Limited Partners Capital Account [Member] Dividends Declared Per Share of Common Stock (in dollars per share) Common Stock Dividends Per Share Declared Dividends Declared Per Share of Non Controlling Interests (in dollars per share) Non Controlling Interests Dividents Per Share Declared Statement Of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation Depletion And Amortization (Gain) loss on sale of depreciable real estate assets Gain Loss On Disposition Of Assets Gain on sale of non-depreciable real estate assets Gainon Saleof Non Depreciable Assets Stock compensation expense Share Based Compensation Amortization of debt issuance costs, discounts and premiums Amortization Of Debt Discount Premium Net change in operating accounts and other operating activities Other Operating Activities Cash Flow Statement Net cash provided by operating activities Net Cash Provided By Used In Operating Activities Cash flows from investing activities: Net Cash Provided By Used In Investing Activities [Abstract] Purchases of real estate and other assets Payments To Acquire Real Estate And Other Assets Capital improvements, development and other Payments For Capital Improvements Distributions from real estate joint ventures Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital Contributions to affiliates Payments To Acquire Equity Method Investments Proceeds from disposition of real estate assets Proceeds From Sale Of Real Estate Heldforinvestment Net cash used in investing activities Net Cash Provided By Used In Investing Activities Cash flows from financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Proceeds from lines of credit Proceeds From Lines Of Credit Repayments of lines of credit Repayments Of Lines Of Credit Net proceeds from commercial paper Proceeds From Repayments Of Commercial Paper Proceeds from notes payable Proceeds From Notes Payable Principal payments on notes payable Repayments Of Notes Payable Payment of deferred financing costs Payments Of Financing Costs Distributions to noncontrolling interests Payments Of Dividends Minority Interest Distributions paid on common shares/units Payments Of Dividends Common Stock Distributions paid on preferred shares/units Payments Of Dividends Preferred Stock And Preference Stock Net change in other financing activities Proceeds From Payments For Other Financing Activities Net cash used in financing activities Net Cash Provided By Used In Financing Activities Net increase (decrease) in cash, cash equivalents and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash, cash equivalents and restricted cash, beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Cash, cash equivalents and restricted cash, end of period Marked to Market Adjustment on Derivative Instruments Reconciliation of cash, cash equivalents and restricted cash: Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract] Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid Net Income taxes paid Income Taxes Paid Supplemental disclosure of noncash investing and financing activities: Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Conversion of OP Units to shares of common stock Conversion Of Stock Amount Converted1 Accrued construction in progress Construction In Progress Expenditures Incurred But Not Yet Paid Interest capitalized Interest Costs Capitalized Mark-to-market adjustment on derivative instruments Marked To Market Adjustment On Derivative Instruments Liabilities and Capital [Abstract] Undeveloped land Land Available For Development Liabilities and capital Liabilities And Capital [Abstract] Due to general partner Due To Related Parties Current Operating Partnership capital: Capital [Abstract] Preferred Units, Preferred Partners' Capital Accounts Preferred Units Preferred Partners Capital Accounts General Partners' Capital Account General Partners Capital Account Limited Partners' Capital Account Limited Partners Capital Account Total operating partners’ capital Capital Total equity Partners Capital Including Portion Attributable To Noncontrolling Interest Total liabilities and equity Liabilities And Capital General Partners' Capital Account, Units Outstanding General Partners Capital Account Units Outstanding Limited Partners' Capital Account, Units Outstanding Limited Partners Capital Account Units Outstanding Preferred Units, Issued Preferred Units Issued Preferred Units, Outstanding Preferred Units Outstanding Basic Earnings Per Unit Diluted Earnings Per Unit Net income available for MAALP unitholders Net Income Loss Available To Common Unit Holders Net income available for MAALP common unitholders Net income available for MAALP common unitholders Basic Earnings Per Unit Net income available for MAALP common unitholders Diluted Earnings Per Unit Units Issued During Period, Value, New Issues General Partnership Units Issued in Exchange for Limited Partnership Units Amortization of unearned compensation Distributions. Partners' Capital Net Income (Loss) Allocated to General Partners Net Income Loss Allocated To General Partners Dividends, Preferred Stock, Cash Issuance of units Units Issued During Period Value New Issues General partner units issued in exchange for limited partner units General Partnership Units Issued In Exchange For Limited Partnership Units Amortization of unearned compensation Amortization Unearned Compensation Dividends, Preferred Stock, Cash Dividends Preferred Stock Cash Distributions to common unitholders Distributions Partners' Capital Partners Capital Partners' Capital Distribution Made to Limited Partner, Distributions Declared, Per Unit Distribution Made To Limited Partner Distributions Declared Per Unit Consolidation and Basis of Presentation and Significant Accounting Policies [Abstract] Consolidation And Basis Of Presentation And Significant Accounting Policies [Abstract] Organization and Summary of Significant Accounting Policies Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Text Block] Earnings Per Common Share Of MAA Abstract. Earnings per Common Share of MAA [Abstract] Earnings per Common Share of MAA Earnings Per Share [Text Block] Earnings Per Unit [Text Block] Earnings Per Share [Abstract] Earnings per OP Unit of MAALP Earnings Per Unit [Text Block] Stock Based Compensation [Abstract] Stock Based Compensation [Abstract] Stock-Based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Notes to financial statements abstract. Notes To Financial Statements [Abstract] Borrowings Debt Disclosure [Text Block] Fair Value Disclosures [Abstract] Financial Instruments and Derivatives Fair Value Disclosures [Text Block] Income Taxes [Abstract] Income Taxes [Abstract] Income Tax Disclosure Income Tax Disclosure [Text Block] Shareholders' Equity of MAA [Abstract] Shareholders Equity Of M A A [Abstract] Shareholders' Equity of MAA Stockholders Equity Note Disclosure [Text Block] Partners Capital Notes [Abstract] Partners' Capital of MAALP Partners Capital Notes Disclosure [Text Block] Employee Benefit Plans [Abstract] Employee Benefit Plans [Abstract] EMPLOYEE BENEFIT PLANS Compensation And Employee Benefit Plans [Text Block] Loss Contingency [Abstract] Commitments and Contingencies Legal Matters And Contingencies [Text Block] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Segment Information Segment Reporting Disclosure [Text Block] Real Estate [Abstract] Real Estate Acquisitions and Dispositions Mergers Acquisitions And Dispositions Disclosures [Text Block] Selected Quarterly Financial Information [Abstract] Selected quarterly financial information line Items. Selected quarterly financial information table. Selected Quarterly Financial Information [Table] Selected Quarterly Financial Information [Table] Consolidated Entities Consolidated Entities [Axis] Consolidated Entities Consolidated Entities [Domain] Parent Company Parent Company [Member] Selected Quarterly Financial Information [Line Items] Selected Quarterly Financial Information [Line Items] Selected Quarterly Financial Information Quarterly Financial Information [Text Block] Real Estate And Accumulated Depreciation Disclosure [Abstract] Schedule III Real Estate and Accumulated Depreciation Real Estate And Accumulated Depreciation Disclosure [Text Block] Basis of presentation and principles of consolidation, policy. Accounting Policies [Abstract] Basis of Presentation And Principles Of Consolidation Basis Of Presentation And Principles Of Consolidation Policy Policy [Text Block] Changes in presentation. Changes in Presentation Changes In Presentation Policy [Text Block] Noncontrolling Interests Policy Text Block. Noncontrolling Interests Noncontrolling Interests Policy [Text Block] Use of Estimates Use Of Estimates Rental Costs Lessor Leases Policy [Text Block] Real Estate Assets and Depreciation and Amortization Real Estate Policy [Text Block] Development Costs [Policy Text Block] Development Costs Development Costs Policy [Text Block] Acquisition related costs, policy. Acquisition of Real Estate Assets Acquisition Related Costs Policy [Text Block] Long-lived assets, goodwill and other intangible assets, policy. Impairment of Long-lived Assets, including Goodwill Long Lived Assets Goodwill And Other Intangible Assets Policy [Text Block] Undeveloped Land Real Estate Held For Development And Sale Policy Investments in Unconsolidated Affiliates Equity Method Investments Policy Cash and Cash Equivalents Cash And Cash Equivalents Policy [Text Block] Restricted Cash Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Other assets, policy. Other Assets Other Assets Policy [Text Block] Accounts payable and accrued liabilities, policy. Accrued Expenses and Other Liabilities Accounts Payable And Accrued Liabilities Policy [Text Block] Income Taxes Income Tax Policy [Text Block] Fair value of derivative financial instruments Fair Value Measurement Policy Policy [Text Block] Leases Lessee Leases Policy [Text Block] Revenue Recognition Revenue Recognition Policy [Text Block] Recently Issued Accounting Pronouncement New Accounting Pronouncements Policy Policy [Text Block] Earnings Per Common Share Of M A A [Abstract] Schedule of Computation of Diluted Earnings per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Schedule of Earnings Per Unit, Basic and Diluted [Table Text Block] Schedule of Diluted Earnings per Common Unit Scheduleof Earnings Per Unit Basicand Diluted Table [Text Block] Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions [Table Text Block] Schedule of Share based Payment Award Restricted Stock Valuation Assumptions Scheduleof Sharebased Payment Award Restricted Stock Valuation Assumptions Table [Text Block] Nonvested Restricted Stock Shares Activity Nonvested Restricted Stock Shares Activity Table [Text Block] Share-based Compensation, Stock Options, Activity Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Debt Disclosure [Abstract] Summary of Outstanding Debt Schedule Of Debt Table [Text Block] Scheduled Principal Repayments on Borrowings Schedule Of Maturities Of Long Term Debt Table [Text Block] Effect of Derivative Instruments on Consolidated Statement of Operations Schedule Of Derivative Instruments Gain Loss In Statement Of Financial Performance [Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule Of Effective Income Tax Rate Reconciliation Table [Text Block] Taxability of cash distributions, table. Taxability Of Cash Distributions Table Taxability Of Cash Distributions Table [Text Block] Schedule of Cumulative Redeemable Preferred Stock Schedule Of Stock By Class [Text Block] Schedule of Operating Lease Obligations Lessee Operating Lease Liability Maturity Table [Text Block] Revenues and NOI for Reportable Segment Reconciliation Of Operating Profit Loss From Segments To Consolidated [Text Block] Assets for Reportable Segment Reconciliation Of Assets From Segment To Consolidated [Text Block] Schedule of real estate asset acquisitions and dispositions. Schedule of Real Estate Asset Acquisitions and Dispositions Schedule Of Real Estate Asset Acquisitions And Dispositions Table [Text Block] Schedule of Quarterly Financial Information Schedule Of Quarterly Financial Information Table [Text Block] Disclosure - Consolidation and Basis of Presentation and Significant Accounting Policies - Additional Information [Abstract] Disclosure Consolidation And Basis Of Presentation And Significant Accounting Policies Additional Information [Abstract] Schedule Of Real Estate Properties [Table] Schedule Of Real Estate Properties [Table] Ownership Ownership [Axis] Ownership Ownership [Domain] MAALP [Member] M A A L P M A A L P [Member] Investment Type Investment Type [Axis] Investments Investment Type Categorization [Member] Development Properties [Member] Development Properties Development Properties [Member] Retail Retail [Member] Commercial Real Estate [Member] Commercial Real Estate [Member] Scenario Statement Scenario [Axis] Scenario Scenario Unspecified [Domain] Expected Costs [Member] Expected Costs Expected Costs [Member] Costs Incurred to Date [Member] Costs Incurred To Date Costs Incurred To Date [Member] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Product and Service Product Or Service [Axis] Product and Service Products And Services [Domain] Real Estate Real Estate [Member] Variable Interest Entity Primary Beneficiary [Member] Variable Interest Entity Primary Beneficiary [Member] Property, Plant and Equipment, Type Property Plant And Equipment By Type [Axis] Property, Plant and Equipment, Type Property Plant And Equipment Type [Domain] Land Improvements And Buildings Land Buildings And Improvements [Member] Furniture, Fixtures And Equipment Furniture And Fixtures [Member] Leases, Acquired-in-Place Leases Acquired In Place [Member] Real Estate Property Ownership Real Estate Properties [Axis] Real Estate Properties Real Estate Properties [Domain] Post Massachusetts Avenue [Member] Post Massachusetts Avenue Post Massachusetts Avenue [Member] Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location Balance Sheet Location [Domain] Other Assets [Member] Other Assets [Member] Accrued Liabilities [Member] Accrued Liabilities [Member] Adjustments for New Accounting Pronouncements Adjustments For New Accounting Pronouncements [Axis] Type of Adoption Type Of Adoption [Member] Accounting Standards Update 2016-02 Accounting Standards Update201602 [Member] Real Estate Properties [Line Items] Real Estate Properties [Line Items] Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Limited Liability Company L L C Or Limited Partnership L P Managing Member Or General Partner Ownership Interest Property Held for Development Number of Real Estate Properties Number Of Real Estate Properties Number of units under development community Number Of Units Under Development Community Square footage of real estate property Area Of Real Estate Property Number of States in which Entity Operates Number Of States In Which Entity Operates Percentage Of Ownership Interests Percentage of ownership interests of all consolidated subsidiaries (percent) Percentage Of Ownership Interests Cash proceeds Proceeds From Payments To Minority Shareholders Consolidated assets Consolidated liabilities Advertising expenses Advertising Expense Equipment, Useful Life Property Plant And Equipment Useful Life Capitalized costs incurred during the period for development properties including capitalized interest, capitalized salaries, and capitalized real estate taxes. Capitalized Development Costs, Period Capitalized Development Costs Period Lease Intangibles, Gross Real Estate Investments, Joint Ventures Real Estate Investments Joint Ventures Accrued Real Estate Taxes Unearned Income Dividends Payable Dividends Payable Current And Noncurrent Accrued Real Estate Taxes Accrued Real Estate Taxes Unearned Income Unearned Income Loss Contingency, Loss in Period Loss Contingency Loss In Period Security Deposit Liability Security Deposit Liability Interest Payable Interest Payable Current And Noncurrent Operating Lease, Right-of-Use Asset Operating Lease Right Of Use Asset Operating Lease, Liability Operating Lease Liability Operating Lease, Weighted Average Remaining Lease Term Operating Lease Weighted Average Remaining Lease Term1 Operating Lease, Weighted Average Discount Rate, Percent Operating Lease Weighted Average Discount Rate Percent Percentage of our total property revenues and total non-property income from leasing of apartment homes, excluding income on deferred compensation plans. Percentage Of Reimbursable Revenue From Leasing Of Apartment Homes. Percentage of Rental Revenue and Other Income From Non-leasing Activities Operating lease, term of contract Lessor Operating Lease Term Of Contract Percentage Of Rental Revenue From Leasing Of Apartment Homes Percentage Of Rental Revenue And Other Income From Leasing Of Apartment Homes Percentage Of Reimbursable Revenue From Leasing Of Apartment Homes Percentage Of Reimbursable Revenue From Leasing Of Apartment Homes Percentage of Rental Revenue and Other Income From Non-leasing Activities Percentageof Rental Revenueand Other Income From Nonleasing Activities Income from continuing operations allocated to unvested restricted shares Adjusted income (loss) from continuing operations available for common shareholders, basic Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Income from Continuing Operations Attributable to Noncontrolling Interest Adjusted income (loss) from continuing operations available for common shareholders, diluted Earnings Per Share Disclosure [Line Items] Earnings Per Share Disclosure [Table] Earnings Per Share Disclosure [Table] Earnings Per Share Disclosure [Table] Antidilutive Securities Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities, Name Antidilutive Securities Name [Domain] Limited Partnership Units [Member] Limited Partnership Units [Member] Limited Partnership Units [Member] Earnings Per Share Disclosure [Line Items] Earnings Per Share Disclosure [Line Items] Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest Income from continuing operations attributable to noncontrolling interests Income Loss From Continuing Operations Attributable To Noncontrolling Entity Income from continuing operations allocated to unvested restricted shares Income From Continuing Operations Allocated To Unvested Restricted Shares Income from continuing operations available for common shareholders, adjusted Adjusted Income Loss From Continuing Operations Available For Common Shareholders Basic Weighted average common shares - basic Weighted Average Number Of Shares Outstanding Basic Earnings per share - basic Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Incomefrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Income from continuing operations attributable to noncontrolling interests Incomefrom Continuing Operations Attributableto Noncontrolling Interest Adjusted Income (Loss) from Continuing Operations Available for Common Shareholders, Diluted Adjusted Income Loss From Continuing Operations Available For Common Shareholders Diluted Effect of dilutive securities Weighted Average Number Diluted Shares Outstanding Adjustment Weighted average common shares - diluted Weighted Average Number Of Diluted Shares Outstanding Earnings per share - diluted Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Net Loss or Income Per Unit Disclosure [Table] Net Loss Or Income Per Unit Disclosure [Table] Net Loss Or Income Per Unit Disclosure [Table] Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income attributable to noncontrolling interests Income from continuing operations allocated to unvested restricted shares Weighted average common units - basic Weighted Average Number Of Limited Partnership And General Partnership Unit Outstanding Basic And Diluted Net income available for MAALP common unitholders, adjusted Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Plan Name Plan Name [Axis] Plan Name Plan Name [Domain] Stock Incentive Plan 2013 [Member] 2013 Stock Incentive Plan [Member] Second Amended And Restated2013 Stock Incentive Plan [Member] Award Type Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Restricted Stock [Member] Restricted Stock [Member] Measurement Input Type Measurement Input Type [Axis] Measurement Input Type Measurement Input Type [Domain] Risk Free Rate [Member] Measurement Input Risk Free Interest Rate [Member] Volatility [Member] Measurement Input Price Volatility [Member] Employee Stock Option [Member] Employee Stock Option [Member] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized Allocated Share-based Compensation Expense Allocated Share Based Compensation Expense Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards Employee Service Share Based Compensation Cash Flow Effect Cash Used To Settle Awards Share based compensation arrangement by share based payment award award vesting period grant date Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period Grant Date Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value Key Assumptions for Restricted Stock Grants [Abstract] Key Assumptionsfor Restricted Stock Grants [Abstract] Risk free rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Risk free rate, Minimum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum Risk free rate, Maximum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum Dividend yield Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Volatility Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Volatility, Minimum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum Volatility, Maximum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum Requisite service period Share Based Compensation Arrangement By Share Based Payment Award Award Requisite Service Period1 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issues in Period Nonvested as of January 1, 2019 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Issued Sharebased Compensation Arrangementby Sharebased Payment Award Equity Instruments Otherthan Options Issuesin Period Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Forfeited Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Nonvested as of December 31, 2019 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issues in Period, Weighted Average Grant Date Fair Value Nonvested as of January 1, 2019 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Issued Sharebased Compensation Arrangementby Sharebased Payment Award Equity Instruments Otherthan Options Issuesin Period Weighted Average Grant Date Fair Value Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value Forfeited Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value Nonvested as of December 31, 2019 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Status of Stock Options [Abstract] Statusof Stock Options [Abstract] Outstanding as of January 1, 2019 Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Granted Exercised Expired Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period Outstanding as of December 31, 2019 Outstanding as of January 1, 2019 Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Granted Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Exercised Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Expired Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price Outstanding as of December 31, 2019 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 Proceeds from Stock Options Exercised Proceeds From Stock Options Exercised Disclosure - Debt Structure [Abstract] Disclosure Debt Structure [Abstract] Debt Instrument [Table] Debt Instrument [Table] Long-term Debt, Type Longterm Debt Type [Axis] Long-term Debt, Type Longterm Debt Type [Domain] Unsecured Debt [Member] Unsecured Debt [Member] Secured Debt [Member] Secured Debt [Member] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] Commercial Paper Notes [Member] Commercial Paper [Member] Term Loan [Member] Term Loan [Member] Term Loan [Member] Variable Rate Debt [Member] Variable Rate Debt [Member] Variable Rate Debt [Member] $1 billion unsecured revolving credit faciltiy [Member] $1 billion unsecured revolving credit facility [Member] A1 Billion Unsecured Revolving Credit Faciltiy [Member] Debt Information [Axis] Debt Information Debt Information [Axis] Debt Information [Domain] Debt Information Debt Information [Domain] Variable Rate Credit Facility [Member] Variable Rate Credit Facility [Member] Variable Rate Credit Facility [Member] Variable Rate Commercial Paper Program [Member] Variable Rate Commercial Paper Program [Member] Variable Rate Commercial Paper Program [Member] Fixed Rate Debt Senior Notes [Member] Fixed Rate Debt Senior Notes [Member] Fixed Rate Debt Senior Notes [Member] Fair Market Value Adjustment and Debt Issuance Cost [Member] Fair Market Value Adjustment and Debt Issuance Cost [Member] Fair Market Value Adjustment And Debt Issuance Cost [Member] $1 billion unsecured revolving credit facility [Member] $1 billion unsecured revolving credit facility [Member] A1billionunsecuredrevolvingcreditfacility [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Line of Credit Facility, Amount Outstanding Line Of Credit Unsecured Debt Commercial Paper Debt Instrument, Face Amount Debt Instrument Face Amount Unsecured Debt Total Outstanding Debt Notes Payable SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Mortgage Loans On Real Estate Debt Instrument, Interest Rate, Effective Percentage Debt Instrument Interest Rate Effective Percentage Contract Maturity Debt Instrument Maturity Date Disclosure notes payable additional information abstract. Disclosure Notes Payable Additional Information [Abstract] Credit Facility Credit Facility [Axis] Credit Facility Credit Facility [Domain] Average [Axis] Average Average [Axis] [Domain] for Average [Axis] Average Average [Domain] Years to maturity [Member] Years To Maturity [Member] Years To Maturity [Member] Public Income Notes [Member] Income Notes [Member] Private Placement [Member] Private Placement [Member] Fixed Rate Debt [Member] Fixed Rate Debt [Member] Fixed Rate Debt [Member] Legal Entity Legal Entity [Axis] Entity Entity [Domain] Three point nine five initial notes due 2029. 3.95% Initial Notes Due 2029 [Member] Three Point Nine Five Initial Notes Due Two Thousand And Twenty Nine [Member] The member stands for 3.95% additional notes that due in March 2029. 3.95% Additional Notes due 2029 [Member] Three Point Nine Five Additional Notes Due Two Thousand And Twenty Nine [Member] Two Point Seven Five Notes Due Two Thousand and Thirty. 2.75% Notes due 2030 [Member] Two Point Seven Five Notes Due Two Thousand And Thirty [Member] Wells Fargo Term Loan [Member] Wells Fargo Term Loan Wells Fargo Term Loan [Member] KeyBank Term Loan [Member] Key Bank Term Loan Key Bank Term Loan [Member] US Bank Term Loan [Member] U S Bank Term Loan [Member] U S Bank Term Loan [Member] Mature in February 2049. Mortgage maturing in February 2049 [Member] Maturing February Twenty Forty Nine Property Mortgage [Member] Mortgages [Member] Mortgages [Member] Line of Credit Facility, Current Borrowing Capacity Line Of Credit Facility Current Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Line Of Credit Facility Maximum Borrowing Capacity Debt Instrument, Basis Spread on Variable Rate Debt Instrument Basis Spread On Variable Rate1 Debt Instrument, Maturity Date Letters of Credit Outstanding, Amount Letters Of Credit Outstanding Amount Debt Instrument, Payment Terms Debt Instrument Payment Terms Debt Instrument, Term Debt Instrument Term Settlement of Forward Swaps Debt Instrument, Interest Rate, Stated Percentage Debt Instrument Interest Rate Stated Percentage Debt Instrument, Redemption Price, Percentage Debt Instrument Redemption Price Percentage Debt Issuance Costs, Gross Deferred Finance Costs Gross Proceeds from Debt, Net of Issuance Costs Proceeds From Debt Net Of Issuance Costs Settlement of Forward Swaps Settlementof Forward Swaps Repayments of Unsecured Debt Repayments Of Unsecured Debt Number of term loans. Debt instrument maturity year. Debt instrument maturity period. Number of Term Loans Number Of Term Loans Debt Instrument Maturity Year Debt Instrument Maturity Year Debt Instrument Maturity Period Debt Instrument Maturity Period Number of apartment communities. Proceeds from Loan Originations Proceeds From Loan Originations1 Number of apartment communities Number Of Apartment Communities Repayments of Secured Debt Repayments Of Secured Debt Disclosure - Scheduled Principal Repayments on Borrowings [Abstract] Disclosure Scheduled Principal Repayments On Borrowings [Abstract] Debt Maturities [Member] Maturities Debt Maturities [Member] Amortization Other [Member] Amortization Other [Member] Amortization Other [Member] 2020 Long Term Debt Maturities Repayments Of Principal In Next Twelve Months 2021 Long Term Debt Maturities Repayments Of Principal In Year Two 2022 Long Term Debt Maturities Repayments Of Principal In Year Three 2023 Long Term Debt Maturities Repayments Of Principal In Year Four 2024 Long Term Debt Maturities Repayments Of Principal In Year Five Thereafter Long Term Debt Maturities Repayments Of Principal After Year Five Total Outstanding Debt Notes Payable Excluding Interest Rate Swaps and Cap Agreements Debt renewal period. Disclosure - Derivatives and Hedging Activities - Additional Information [Abstract] Disclosure Derivatives And Hedging Activities Additional Information [Abstract] Derivative [Table] Derivative [Table] Floating Rate Debt [Member] Floating Rate Debt [Member] Floating Rate Debt [Member] Conventional variable rate debt. Conventional Variable Rate Debt [Member] Conventional Variable Rate Debt [Member] Hedging Designation Hedging Designation [Axis] Hedging Designation Hedging Designation [Domain] Designated as Hedging Instrument Designated As Hedging Instrument [Member] Derivative Instrument Derivative Instrument Risk [Axis] Derivative Contract Derivative Contract Type [Domain] Interest Rate Swap [Member] Interest Rate Swap [Member] Measurement Frequency Fair Value By Measurement Frequency [Axis] Measurement Frequency Fair Value Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value Measurements Recurring [Member] Accrued Expenses and Other Liabilities [Member] Other Liabilities [Member] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Interest Expense Interest Expense [Member] Liability Class Fair Value By Liability Class [Axis] Fair Value by Liability Class Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation By Liability Class [Domain] net liability position [Member] Net Liability Position [Member] Net Liability Position [Member] Derivative [Line Items] Derivative [Line Items] Notes Payable Excluding Interest Rate Swaps and Cap Agreements Notes Payable Excluding Interest Rate Swaps And Cap Agreements Notes Payable, Fair Value Disclosure Notes Payable Fair Value Disclosure Debt Renewal Period Debt Renewal Period Derivative, Number of Instruments Held Derivative Number Of Instruments Held Derivative, Notional Amount Derivative Notional Amount Interest Rate Derivative Assets, at Fair Value Interest Rate Derivative Assets At Fair Value Interest Rate Derivative Liabilities, at Fair Value Interest Rate Derivative Liabilities At Fair Value Preferred Stock, Redemption Price Per Share Preferred Stock Redemption Price Per Share Preferred Stock, Redemption Date Preferred Stock Redemption Date Embedded Derivative, Fair Value of Embedded Derivative Asset Embedded Derivative Fair Value Of Embedded Derivative Asset Change in fair value of interest rate derivatives included in AOCI and expected to be reclassified in the next 12 months Derivative Instruments Gain Loss Reclassification From Accumulated O C I To Income Estimated Net Amount To Be Transferred Disclosure - Effect of Derivative Instruments on Consolidated Statement of Operations [Abstract] Disclosure Effect Of Derivative Instruments On Consolidated Statement Of Operations [Abstract] Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table] Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table] Interest Rate Contract Interest Rate Contract [Member] Not Designated as Hedging Instrument Nondesignated [Member] Unrealized (loss) gain from the effective portion of derivative instruments Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Derivative Instruments Gain Loss Reclassified From Accumulated O C I Into Income Effective Portion Net Derivative Instruments, Gain (Loss) Recognized in Income, Net Derivative Gain Loss On Derivative Net Credit Risk Related Contingent Features, Termination Value Credit Risk Related Contingent Features Termination Value Credit Risk Related Contingent Features Termination Value Tax expense/(benefit) at U.S. statutory rates on TRS income subject to tax Valuation Allowance Change in Amount Reconciliation of Income Tax Attributable to Continuing Operations [Abstract] Reconciliationof Income Tax Attributableto Continuing Operations [Abstract] Federal Income Tax Note [Table] Federal Income Tax Note [Table] Related Party Related Party Transactions By Related Party [Axis] Related Party Related Party [Domain] Subsidiary of Common Parent Subsidiary Of Common Parent [Member] Investments, Owned, Federal Income Tax Note Investments Owned Federal Income Tax Note [Line Items] Tax expense at U.S. statutory rates on the Company's TRS income subject to tax Taxexpensebenefitat U S Statutoryrateson T R Sincomesubjecttotax Valuation Allowance Change in Amount Valuation Allowance Changein Amount Income tax expense/(benefit) Income Tax Expense Disclosure - INCOME TAXES - Additional Information [Abstract] Disclosure Income Taxes Additional Information [Abstract] Income tax expense Income Tax Expense Operating Loss Carryforwards Operating Loss Carryforwards Ordinary Income, Dividends, Per Share Return of Capital, Dividends, Per Share Un-recaptured Section 1250 Gain Dividends Per Share Common Stock Dividends, Per Share, Cash Paid, Percentage Ordinary Income, Dividends, Per Share, Percentage Return of Capital, Dividends, Per Share, Percentage Unrecaptured Section 1250 Gain, Dividends, Per Share, Percentage Disclosure - Taxability of Cash Distributions Paid on Common Shares [Abstract] Disclosure Taxability Of Cash Distributions Paid On Common Shares [Abstract] Ordinary income (dollars per share) Ordinary Income Dividends Per Share Return of capital (dollars per share) Return Of Capital Dividends Per Share Un-recaptured Section 1250 gain dividends per share Unrecaptured Section1250 Gain Dividends Per Share Total (dollars per share) Common Stock Dividends Per Share Cash Paid Ordinary income (percentage per share) Ordinary Income Dividends Per Share Percentage Return of capital (percentage per share) Returnof Capital Dividends Per Share Percentage Un-recaptured Section 1250 gain dividends per share percentage Unrecaptured Section1250 Gain Dividends Per Share Percentage Total (percentage per share) Common Stock Dividends Per Share Cash Paid Percentage Tax expense/(benefit) at U.S. statutory rates on TRS income subject to tax Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential Common Shares Issuable upon Conversion of Convertible Stock Common Shares and Operating Partnership Units, Outstanding MAA Equity. M A A Equity [Abstract] Equity [Line Items] Equity Disclosure [Table] Equity Disclosure [Table] Equity Disclosure [Table] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Dividend And Distribution Reinvestment And Share Purchase Plan [Member] Dividend And Distribution Reinvestment And Share Purchase Plan Dividend And Distribution Reinvestment And Share Purchase Plan [Member] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] At the market offering. At The Market Offering At The Market Offering [Member] Equity [Line Items] Equity [Line Items] Common Shares Issuable Upon Conversion Of Convertible Stock Common Shares Issuable Upon Conversion Of Convertible Stock Total common shares and operating partnership units outstanding Common Shares And Operating Partnership Units Outstanding Business Acquisition Business Acquisition [Axis] Business Acquisition, Acquiree Business Acquisition Acquiree [Domain] Redeemable Preferred Stock [Member] Redeemable Preferred Stock [Member] Preferred Stock, Dividend Rate, Per-Dollar-Amount Preferred Stock Dividend Rate Per Dollar Amount Preferred Stock, Liquidation Preference, Value Preferred Stock Liquidation Preference Value Optional Cash Investments in Common Stock Common Stock, Discount Rate Optional cash investments in common shares Optional Cash Investments In Common Stock Discount rate on sale of common stock (percent) Common Stock Discount Rate Common stock issued for shareholders to reinvest distributions (shares) Stock Issued During Period Shares Dividend Reinvestment Plan Number of shares remaining for issuance. Common stock shares sold Sale Of Stock Number Of Shares Issued In Transaction Net proceeds from share issued Proceeds From Issuance Of Common Stock Remaining common stock to sale Number Of Shares Remaining For Issuance Operating Partnership Units, Outstanding [Line Items] for Schedule of Capital Structure [Table] Schedule of Capital Structure [Table] Scheduleof Capital Structure [Table] Scheduleof Capital Structure [Table] Scheduleof Capital Structure [Line Items] Scheduleof Capital Structure [Line Items] Operating partnership units outstanding Operating Partnership Units Outstanding Redeemable Capital Shares, Par or Stated Value Per Share Redeemable Capital Shares Par Or Stated Value Per Share Redeemable Capital Shares Par Or Stated Value Per Share Schedule Of Defined Benefit Plans Disclosures [Table] Schedule Of Defined Benefit Plans Disclosures [Table] Nonqualified Deferred Compensation Plan [Member] Nonqualified Deferred Compensation Plan Nonqualified Deferred Compensation Plan [Member] Outside Directors [Member] Outside Directors Outside Directors [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Employer contribution for defined contribution plan Defined Contribution Plan Cost Recognized Deferred compensation expense Deferred Compensation Arrangement With Individual Compensation Expense Number of days after departure from board of directors for payment of deferred compensation Number of annual installments of deferred compensation Number of annual installments of deferred compensation (installment) Number Of Annual Installments Of Deferred Compensation Number of days after departure from board of directors for payment of deferred compensation (days) Number Of Days After Departure From Board Of Directors For Payment Of Deferred Compensation Number of shares issued during the period as a result of reissuance of treasury stock for Director stock awards. Number of deferred common stock (shares) Stock Issued During Period Shares Director Stock Award Employee Stock Ownership Plan, common stock, fair value Employee Stock Ownership Plan E S O P Deferred Shares Fair Value Employee Stock Ownership Plan, common stock, shares outstanding (shares) Employee Stock Ownership Plan E S O P Shares In E S O P Lease expiration year. Loss Contingencies [Table] Loss Contingencies [Table] Real Estate, Type of Property Mortgage Loans On Real Estate Description Type Of Property [Axis] Real Estate Mortgage Loans On Real Estate Name Property Type [Domain] Apartment Communities [Member] Apartment Building [Member] Office Lease [Member] Office Building [Member] Litigation Case Litigation Case [Axis] Litigation Case Litigation Case Type [Domain] Cleven Litigation Case [Member] Cleven Litigation Case [Member] Cleven Litigation Case [Member] Brown Litigation Case [Member] Brown Litigation Case [Member] Brown Litigation Case [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Lease expiration year Lease Expiration Year Operating Leases, Future Minimum Payments Due, Next Twelve Months Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months Operating Leases, Future Minimum Payments, Due in Two Years Lessee Operating Lease Liability Payments Due Year Two Operating Leases, Future Minimum Payments, Due in Three Years Lessee Operating Lease Liability Payments Due Year Three Operating Leases, Future Minimum Payments, Due in Four Years Lessee Operating Lease Liability Payments Due Year Four Operating Leases, Future Minimum Payments, Due in Five Years Lessee Operating Lease Liability Payments Due Year Five Operating Leases, Future Minimum Payments, Due Thereafter Lessee Operating Lease Liability Payments Due After Year Five Operating Leases, Future Minimum Payments Due Lessee Operating Lease Liability Payments Due Net present value adjustments Lessee Operating Lease Liability Undiscounted Excess Amount Loss Contingency, Estimate of Possible Loss Loss Contingency Estimate Of Possible Loss Loss Contingency Accrual Loss Contingency Accrual At Carrying Value Due to related parties, Current Segment Reporting Disclosure Of Entitys Reportable Segments [Abstract] Schedule Of Segment Reporting Information By Segment [Table] Schedule Of Segment Reporting Information By Segment [Table] Segments Statement Business Segments [Axis] Segments Segment [Domain] Same Store [Member] Same Store [Member] Same Store [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of owned or owned interests of apartment communities Number of reportable segments Number Of Reportable Segments Period properties owned and stabilized Period properties owned and stabilized Period Properties Owned And Stabilized Period Properties Stabilized Occupancy Level for Stabilized Communities Occupancy Level for Stabilized Communities Occupancy Level For Stabilized Communities Period Properties Stabilized Period Properties Stabilized Disclosure - Revenues and NOI for Reportable Segment [Abstract] Disclosure Revenues And Noi For Reportable Segment [Abstract] Reconciliation Of Operating Profit Loss From Segments To Consolidated [Table] Reconciliation Of Operating Profit Loss From Segments To Consolidated [Table] Non Same Store and Other [Member] Non-Same Store and Other Non Same Store And Other [Member] Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] Segment Information Revenue from Contract with Customer, Including Assessed Tax Revenue From Contract With Customer Including Assessed Tax Property Management Fee Revenue Property Management Fee Revenue Other Operating Income Other Operating Income Total operating revenues Net Operating Income Operating Income Before Depreciation Depreciation and amortization Other Cost and Expense, Operating General and administrative expense Business Combination, Merger and Integration Related Expenses Business Combination Mergerand Integration Related Expenses Interest expense Gain (loss) on sale of depreciable real estate assets Gain on sale of non-depreciable real estate assets Other non-operating income Gain (loss) from real estate joint ventures Preferred Stock Dividends, Income Statement Impact Reimbursable property revenues Disclosure - Assets for Reportable Segment [Abstract] Disclosure Assets For Reportable Segment [Abstract] Reconciliation Of Assets From Segment To Consolidated [Table] Reconciliation Of Assets From Segment To Consolidated [Table] Corporate assets Corporate [Member] Segment Reporting Asset Reconciling Item [Line Items] Segment Reporting Asset Reconciling Item [Line Items] Total assets Acquisitions and Disposals [Line Items] Acquisitions and disposals. Acquisitions And Disposals [Table] Acquisitions And Disposals [Table] The greene. The Greene [Member] The Greene [Member] Jefferson Sand Lake [Member] Jefferson Sand Lake [Member] Jefferson Sand Lake [Member] Novel Midtown Member. Novel Midtown [Member] Novel Midtown [Member] Riverside Retail [Member] 220 Riverside Retail [Member] Riverside Retail [Member] North orange avenue outparcel North Orange Avenue Outparcel [Member] North Orange Avenue Outparcel [Member] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] Greenville, SC Greenville, SC [Member] Greenville S C [Member] Member stands for Orlando, Florida. Orlando, FL Orlando Florida [Member] Phoenix, AZ ARIZONA Member stands for Jacksonville, Florida. Jacksonville, FL Jacksonville Florida [Member] Multifamily [Member] Multifamily [Member] Financial Instrument Financial Instrument [Axis] Financial Instruments Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Commercial [Member] Land [Member] Land [Member] Little Rock, AR [Member] ARKANSAS Memphis, TN [Member] TENNESSEE Atlanta, GA [Member] GEORGIA Huntsville, AL [Member] ALABAMA Name of Property Real Estate And Accumulated Depreciation Description Of Property [Axis] Name of Property Real Estate And Accumulated Depreciation Name Of Property [Domain] Calais Forest [Member] Calais Forest [Member] Calais Forest [Member] Napa Valley [Member] Napa Valley [Member] Napa Valley [Member] Palisades at Chenal Valley [Member] Palisades at Chenal Valley [Member] Palisades At Chenal Valley [Member] Ridge at Chenal Valley [Member] Ridge at Chenal Valley [Member] Ridgeat Chenal Valley [Member] Westside Creek I and II [Member] Westside Creek [Member] Westside Creek I And I I [Member] Polar Avenue Office [Member] Poplar Avenue Office [Member] Polar Avenue Office [Member] Peachtree Road Outparcel [Member] Peachtree Road - Outparcel [Member] Peachtree Road Outparcel [Member] Colonial Promenade Outparcel [Member] Colonial Promenade - Outparcel [Member] Colonial Promenade Outparcel [Member] Forty seven canal place - Outparcel. Forty Seven Canal Place - Outparcel [Member] Forty Seven Canal Place Outparcel [Member] Craft Farms Outparcel [Member] Craft Farms - Outparcel [Member] Craft Farms Outparcel [Member] Acquisitions and Disposals [Line Items] Acquisitionsand Disposals [Line Items] Number of Units in Real Estate Property Number Of Units In Real Estate Property Area of Land Area Of Land Real estate acquisition date. Acquisition Date Real Estate Acquisition Date Joint venture interest Minority Interest Ownership Percentage By Parent Real estate, disposition date. Disposal Date Real Estate Disposition Date Schedule Of Condensed Financial Statements [Table] Schedule Of Condensed Financial Statements [Table] Condensed Financial Statements Captions [Line Items] Condensed Financial Statements Captions [Line Items] Net income available for MAA common shareholders Net income available for MAALP common unitholders Real estate geographic location of property 1. Date real estate investment property was constructed for entities with a substantial portion of business acquiring and holding investment real estate, in CCYY-MM-DD format. Amount of land and buildings and improvements made to real estate investments and capitalized after acquisition for entities with a substantial portion of business acquiring and holding investment real estate. Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements Net Real Estate And Accumulated Depreciation By Property [Table] Real Estate And Accumulated Depreciation By Property [Table] Wholly Owned Properties - Residential Wholly Owned Properties [Member] Birchall at Ross Bridge [Member] Birchall At Ross Bridge Birchall At Ross Bridge [Member] Colonial Grand at Riverchase Trails [Member] Colonial Grand At Riverchase Trails Colonial Grand At Riverchase Trails [Member] Colonial Village at Trussville [Member] Colonial Village At Trussville Colonial Village At Trussville [Member] Eagle Ridge [Member] Eagle Ridge Eagle Ridge [Member] Colonial Grand at Traditions [Member] Colonial Grand At Traditions Colonial Grand At Traditions [Member] Colonial Grand at Edgewater [Member] Colonial Grand At Edgewater Colonial Grand At Edgewater [Member] Paddock Club at Providence [Member] Paddock Clubat Providence Paddock Clubat Providence [Member] Colonial Grand at Madison [Member] Colonial Grand At Madison Colonial Grand At Madison [Member] Cypress Village [Member] Cypress Village Cypress Village [Member] Colonial Grand at Liberty Park [Member] Colonial Grand At Liberty Park Colonial Grand At Liberty Park [Member] Edge at Lyon's Gate [Member] Edge At Lyons Gate Edge At Lyons Gate [Member] Residences at Fountainhead [Member] Residencesat Fountainhead Residencesat Fountainhead [Member] Sky View Ranch [Member] Sky View Ranch Sky View Ranch [Member] Talus Ranch [Member] Talus Ranch Talus Ranch [Member] Colonial Grand at Inverness Commons [Member] Colonial Grand At Inverness Commons Colonial Grand At Inverness Commons [Member] Colonial Grand at Scottsdale [Member] Colonial Grand At Scottsdale Colonial Grand At Scottsdale [Member] Colonial Grand at OldTown Scottsdale [Member] Colonial Grandat Old Town Scottsdale Colonial Grandat Old Town Scottsdale [Member] SkySong [Member] Sky Song Sky Song [Member] Sync 36 I. Sync36 I Sync36 I [Member] Sync 36 II [Member] Sync36 I I Sync36 I I [Member] Post River North [Member] Post River North [Member] Post River North [Member] Tiffany Oaks [Member] Tiffany Oaks Tiffany Oaks [Member] Indigo Point [Member] Indigo Point Indigo Point [Member] Paddock Club Brandon [Member] Paddock Club Brandon Paddock Club Brandon [Member] Colonial Grand at Lakewood Ranch [Member] Colonial Grand At Lakewood Ranch Colonial Grand At Lakewood Ranch [Member] Preserve at Coral Square [Member] Preserve At Coral Square Preserve At Coral Square [Member] Paddock Club Gainesville [Member] Paddock Club Gainesville Paddock Club Gainesville [Member] Retreat at Magnolia Park [Member] Retreat At Magnolia Park Retreat At Magnolia Park [Member] Colonial Grand at Heathrow [Member] Colonial Grand At Heathrow Colonial Grand At Heathrow [Member] 220 Riverside [Member] A220 Riverside A220 Riverside [Member] Atlantic Crossing [Member] Atlantic Crossing Atlantic Crossing [Member] Cooper's Hawk [Member] Coopers Hawk Coopers Hawk [Member] Hunter's Ridge at Deerwood [Member] Hunters Ridge At Deerwood Hunters Ridge At Deerwood [Member] Lakeside [Member] Lakeside Lakeside [Member] Lighthouse at Fleming Island [Member] Lighthouse At Fleming Island Lighthouse At Fleming Island [Member] Paddock Club Mandarin [Member] Paddock Club Mandarin Paddock Club Mandarin [Member] St. Augustine [Member] St Augustine St Augustine [Member] Tattersall at Tapestry Park [Member] Tattersall At Tapestry Park Tattersall At Tapestry Park [Member] Woodhollow [Member] Woodhollow Woodhollow [Member] Colonial Grand at Town Park [Member] Colonial Grand At Town Park Colonial Grand At Town Park [Member] Colonial Grand at Town Park Reserve [Member] Colonial Grand At Town Park Reserve Colonial Grand At Town Park Reserve [Member] Colonial Grand at Lake Mary [Member] Colonial Grandat Lake Mary Colonial Grandat Lake Mary [Member] Colonial Grand at Randal Lakes [Member] Colonial Grand At Randal Lakes Colonial Grand At Randal Lakes [Member] Colonial Grand at Randal Lakes II [Member] Colonial Grandat Randal Lakes I I Colonial Grandat Randal Lakes I I [Member] Retreat at Lake Nona [Member] Retreat At Lake Nona Retreat At Lake Nona [Member] Colonial Grand at Heather Glen [Member] Colonial Grand At Heather Glen Colonial Grand At Heather Glen [Member] Post Lake at Baldwin Park [Member] Post Lakeat Baldwin Park Post Lakeat Baldwin Park [Member] Post Lakeside [Member] Post Lakeside Post Lakeside [Member] Post Parkside Orlando [Member] Post Parkside Orlando Post Parkside Orlando [Member] Park Crest at Innisbrook [Member] Park Crest At Innisbrook Park Crest At Innisbrook [Member] Club at Panama Beach [Member] Club At Panama Beach Club At Panama Beach [Member] Colonial Village at Twin Lakes [Member] Colonial Village At Twin Lakes Colonial Village At Twin Lakes [Member] Paddock Club Tallahassee [Member] Paddock Club Tallahassee Paddock Club Tallahassee [Member] Verandas at Southwood [Member] Verandasat Southwood Verandasat Southwood [Member] Belmere [Member] Belmere Belmere [Member] Links at Carrollwood [Member] Links At Carrollwood Links At Carrollwood [Member] Post Bay at Rocky Point [Member] Post Bayat Rocky Point Post Bayat Rocky Point [Member] Post Harbour Place [Member] Post Harbour Place Post Harbour Place [Member] Post Hyde Park [Member] Post Hyde Park Post Hyde Park [Member] Post Rocky Point [Member] Post Rocky Point Post Rocky Point [Member] Post Soho Square [Member] Post Soho Square Post Soho Square [Member] Village Oaks [Member] Village Oaks Village Oaks [Member] Colonial Grand at Hampton Preserve (Tampa, FL) [Member] Colonial Grand At Hampton Preserve Tampa Fl Colonial Grand At Hampton Preserve Tampa Fl [Member] Colonial Grand at Seven Oaks Member. Colonial Grand At Seven Oaks Member Colonial Grand At Seven Oaks [Member] Colonial Grand at Windermere Member. Colonial Grand At Windermere Member Colonial Grand At Windermere [Member] Allure at Brookwood member. Allure At Brookwood Member Allure At Brookwood [Member] Allure in Buckhead Village member. Allure In Buckhead Village Member Allure In Buckhead Village [Member] The High Rise at Post Alexander member. The High Rise At Post Alexander Member The High Rise At Post Alexander [Member] Buildings and Fixtures Building And Building Improvements [Member] Phase [Axis] Phase Phase [Axis] [Domain] for Phase [Axis] Phase Phase [Domain] Phase I [Member] Phase I [Member] Phase I [Member] Phase II [Member] Phase II [Member] Phase Ii [Member] Post Alexander member. Post Alexander [Member] Post Alexander [Member] Post Briarcliff member. Post Briarcliff [Member] Post Briarcliff [Member] Post Brookhaven member. Post Brookhaven [Member] Post Brookhaven [Member] Post Chastain member. Post Chastain [Member] Post Chastain [Member] Post Crossing member. Post Crossing [Member] Post Crossing [Member] Post Gardens member. Post Gardens [Member] Post Gardens [Member] Post Glen member. Post Glen [Member] Post Glen [Member] Post Midtown member. Post Midtown [Member] Post Midtown [Member] Post Peachtree Hills member. Post Peachtree Hills [Member] Post Peachtree Hills [Member] Post Riverside member. Post Riverside [Member] Post Riverside [Member] Post Spring member. Post Spring [Member] Post Spring [Member] Post Stratford member. Post Stratford [Member] Post Stratford [Member] Sanctuary at Oglethorpe member. Sanctuary at Oglethorpe [Member] Sanctuary At Oglethorpe [Member] Post Centennial Park member, Post Centennial Park [Member] Post Centennial Park [Member] Prescott member. Prescott [Member] Prescott [Member] Colonial Grand at Berkeley Lake member. Colonial Grand at Berkeley Lake [Member] Colonial Grand At Berkeley Lake [Member] Colonial Grand at River Oaks member. Colonial Grand at River Oaks [Member] Colonial Grand At River Oaks [Member] Colonial Grand at River Plantation member. Colonial Grand at River Plantation [Member] Colonial Grand At River Plantation [Member] Colonial Grand at McDaniel Farm member. Colonial Grand at McDaniel Farm [Member] Colonial Grand At Mc Daniel Farm [Member] Colonial Grand at Pleasant Hill member. Colonial Grand at Pleasant Hill [Member] Colonial Grand At Pleasant Hill [Member] Colonial grand at mount vernon. Colonial Grand at Mount Vernon [Member] Colonial Grand At Mount Vernon [Member] Lake Lanier Club [Member] Lake Lanier Club [Member] Lake Lanier Club [Member] Colonial Grand at Shiloh Colonial Grand at Shiloh [Member] Colonial Grand At Shiloh [Member] Millstead village. Millstead Village [Member] Millstead Village [Member] Colonial grand at barrett creek. Colonial Grand at Barrett Creek [Member] Colonial Grand At Barrett Creek [Member] Colonial grand at godley station. Colonial Grand at Godley Station [Member] Colonial Grand At Godley Station [Member] Colonial grand at godley lake. Colonial Grand at Godley Lake [Member] Colonial Grand At Godley Lake [Member] Avala at savannah quarters. Avala at Savannah Quarters [Member] Avala At Savannah Quarters [Member] Georgetown grove. Georgetown Grove [Member] Georgetown Grove [Member] Colonial grand at hammocks. Colonial Grand at Hammocks [Member] Colonial Grand At Hammocks [Member] Colonial village at greentree. Colonial Village at Greentree [Member] Colonial Village At Greentree [Member] Colonial village at huntington. Colonial Village at Huntington [Member] Colonial Village At Huntington [Member] Colonial village at marsh cove. Colonial Village at Marsh Cove [Member] Colonial Village At Marsh Cove [Member] Oaks at wilmington island. Oaks at Wilmington Island [Member] Oaks At Wilmington Island [Member] Highlands of West Village [Member] Highlands of West Village [Member] Highlandsof West Village [Member] Haven at prairie trace. Haven at Prairie Trace [Member] Haven At Prairie Trace [Member] Grand reserve at pinnacle. Grand Reserve at Pinnacle [Member] Grand Reserve At Pinnacle [Member] Lakepointe. Lakepointe [Member] Lakepointe [Member] The Mansion. The Mansion [Member] The Mansion [Member] The village. The Village [Member] The Village [Member] Stonemill village. Stonemill Village [Member] Stonemill Village [Member] Crosswinds. Crosswinds [Member] Crosswinds [Member] Pear orchard. Pear Orchard [Member] Pear Orchard [Member] Reflection pointe. Reflection Pointe [Member] Reflection Pointe [Member] Lakeshore landing. Lakeshore Landing [Member] Lakeshore Landing [Member] Market station. Market Station Market Station [Member] The denton. The Denton [Member] The Denton [Member] The denton II. The Denton II [Member] The Denton I I [Member] Post Parkside [Member] Post Parkside [Member] Post Parkside [Member] The denton III. The Denton III The Denton I I I [Member] Colonial grand at desert vista. Colonial Grand at Desert Vista [Member] Colonial Grand At Desert Vista [Member] Colonial grand at palm vista. Colonial Grand at Palm Vista [Member] Colonial Grand At Palm Vista [Member] Colonial village at beaver creek. Colonial Village at beaver creek [Member] Colonial Village At Beaver Creek [Member] Hermitage at beechtree. Hermitage at Beechtree [Member] Hermitage At Beechtree [Member] Waterford forest. Waterford Forest [Member] Waterford Forest [Member] One thousand two hundred twenty five south church I. 1225 South Church I [Member] One Thousand Two Hundred Twenty Five South Church I [Member] Colonial grand at ayrsley. Colonial Grand at Ayrsley [Member] Colonial Grand At Ayrsley [Member] Colonial grand at beverly crest. Colonial Grand at Beverly Crest [Member] Colonial Grand At Beverly Crest [Member] Colonial grand at legacy park. Colonial Grand at Legacy Park [Member] Colonial Grand At Legacy Park [Member] Colonial grand at mallard creek. Colonial Grand at Mallard Creek [Member] Colonial Grand At Mallard Creek [Member] Colonial grand at mallard lake. Colonial Grand at Mallard Lake [Member] Colonial Grand At Mallard Lake [Member] Colonial grand at university center. Colonial Grand at University Center [Member] Colonial Grand At University Center [Member] Colonial reserve at south end. Colonial Reserve at South End [Member] Colonial Reserve At South End [Member] Colonial village at chancellor park. Colonial Village at Chancellor Park [Member] Colonial Village At Chancellor Park [Member] Colonial village at south tryon. Colonial Village at South Tryon [Member] Colonial Village At South Tryon [Member] Colonial village at timber crest. Colonial Village At Timber Crest Colonial Village At Timber Crest [Member] Enclave. Enclave [Member] Enclave [Member] Post Ballantyne. Post Ballantyne [Member] Post Ballantyne [Member] Post gateway place. Post Gateway Place Post Gateway Place [Member] Post park at phillips place. Post Park at Phillips Place [Member] Post Park At Phillips Place [Member] Post south end. Post South End [Member] Post South End [Member] Post uptown place. Post Uptown Place [Member] Post Uptown Place [Member] Colonial grand at cornelius. Colonial Grand at Cornelius [Member] Colonial Grand At Cornelius [Member] Colonial grand at patterson place. Colonial Grand at Patterson Place [Member] Colonial Grand At Patterson Place [Member] Colonial village at deerfield. Colonial Village at Deerfield [Member] Colonial Village At Deerfield [Member] Colonial grand at research park. Colonial Grand at Research Park [Member] Colonial Grand At Research Park [Member] Phase iii. Phase III [Member] Phase Iii [Member] Colonial Grand at Huntersville [Member] Colonial Grand At Huntersville[Member] Colonial Grand At Huntersville [Member] Colonial Village at Matthews [Member] Colonial Village At Matthews Colonial Village At Matthews [Member] Colonial Grand at Matthews Commons [Member] Colonial Grand At Matthews Commons Colonial Grand At Matthews Commons [Member] Colonial Grand at Arringdon [Member] Colonial Grand At Arringdon Colonial Grand At Arringdon [Member] Colonial Grand at Brier Creek [Member] Colonial Grand At Brier Creek Raleigh Nc Colonial Grand At Brier Creek Raleigh Nc [Member] Colonial Grand at Brier Falls (Raleigh, NC) [Member] Colonial Grand At Brier Falls Raleigh Nc Colonial Grand At Brier Falls Raleigh Nc [Member] Colonial Grand at Crabtree Valley [Member] Colonial Grand At Crabtree Valley Colonial Grand At Crabtree Valley [Member] Hue [Member] Hue Hue [Member] Colonial Grand at Trinity Commons [Member] Colonial Grand At Trinity Commons Colonial Grand At Trinity Commons [Member] Post Parkside at Wade [Member] Post Parksideat Wade Post Parksideat Wade [Member] Post Parkside at Wade II [Member] Post Parksideat Wade I I Post Parksideat Wade I I [Member] Post Parkside at Wade I I I. Post Parkside At Wade I I I Post Parkside At Wade I I I [Member] Preserve at Brier Creek [Member] Preserve At Brier Creek Preserve At Brier Creek [Member] Providence at Brier Creek [Member] Providence At Brier Creek Providence At Brier Creek [Member] Tanglewood [Member] Tanglewood Tanglewood [Member] Colonial Grand at Cypress Cove [Member] Colonial Grand At Cypress Cove Colonial Grand At Cypress Cove [Member] Colonial Village at Hampton Pointe [Member] Colonial Village At Hampton Pointe Colonial Village At Hampton Pointe [Member] Colonial Grand at Quarterdeck [Member] Colonial Grand At Quarterdeck Colonial Grand At Quarterdeck [Member] Colonial Village at Westchase [Member] Colonial Village At Westchase Colonial Village At Westchase [Member] River's Walk [Member] Rivers Walk Rivers Walk [Member] 1201 Midtown [Member] A1201 Midtown A1201 Midtown [Member] 1201 Midtown II [Member] [Member] A1201 Midtown I I A1201 Midtown I I Member [Member] Fairways [Member] Fairways Fairways [Member] Paddock Club Columbia [Member] Paddock Club Columbia Paddock Club Columbia [Member] Colonial Village at Windsor Place [Member] Colonial Village At Windsor Place Colonial Village At Windsor Place [Member] Highland Ridge [Member] Highland Ridge Highland Ridge [Member] Howell Commons [Member] Howell Commons Howell Commons [Member] Paddock Club Greenville [Member] Paddock Club Greenville Paddock Club Greenville [Member] Park Haywood [Member] Park Haywood Park Haywood [Member] Spring Creek [Member] Spring Creek Spring Creek [Member] Innovation Apartment Homes [Member] Innovation Apartment Homes Innovation Apartment Homes [Member] Runaway Bay [Member] Runaway Bay Runaway Bay [Member] Colonial Grand at Commerce Park (Charleston, SC) [Member] Colonial Grand At Commerce Park Charleston Sc Colonial Grand At Commerce Park Charleston Sc [Member] Brookwood 535 [Member] Brookwood535 Brookwood535 [Member] Park Place [Member] Park Place Park Place [Member] Farmington Village [Member] Farmington Village Farmington Village [Member] Colonial Village at Waters Edge [Member] Colonial Village At Waters Edge Colonial Village At Waters Edge [Member] Hamilton Pointe [Member] Hamilton Pointe Hamilton Pointe [Member] Hidden Creek [Member] Hidden Creek Hidden Creek [Member] Steeplechase [Member] Steeplechase Steeplechase [Member] Windridge [Member] Windridge Windridge [Member] Kirby Station [Member] Kirby Station Kirby Station [Member] Lincoln on the Green [Member] Lincoln On Green Lincoln On Green [Member] Park Estate [Member] Park Estate Park Estate [Member] Reserve at Dexter Lake [Member] Reserve At Dexter Lake Reserve At Dexter Lake [Member] Paddock Club Murfreesboro [Member] Paddock Club Murfreesboro Paddock Club Murfreesboro [Member] Acklen West End [Member] Acklen West End Acklen West End [Member] Aventura at Indian Lake Village [Member] Aventura At Indian Lake Village Aventura At Indian Lake Village [Member] Avondale at Kennesaw [Member] Avondale At Kennesaw Avondale At Kennesaw [Member] Brentwood Downs [Member] Brentwood Downs Brentwood Downs [Member] Charlotte at MIdtown [Member] Charlotteat M Idtown Charlotteat M Idtown [Member] Colonial Grand at Bellevue [Member] Colonial Grand At Bellevue Colonial Grand At Bellevue [Member] Grand View Nashville [Member] Grand View Nashville Grand View Nashville [Member] Monthaven Park [Member] Monthaven Park Monthaven Park [Member] Park at Hermitage [Member] Park At Hermitage Park At Hermitage [Member] Venue at Cool Springs [Member] Venue At Cool Springs Venue At Cool Springs [Member] Verandas at Sam Ridley [Member] Verandas At Sam Ridley Verandas At Sam Ridley [Member] Balcones Woods [Member] Balcones Woods Balcones Woods [Member] Colonial Grand at Canyon Creek (Austin, TX) [Member] Colonial Grand At Canyon Creek Austin Tx Colonial Grand At Canyon Creek Austin Tx [Member] Colonial Grand at Canyon Ranch [Member] Colonial Grand At Canyon Ranch Colonial Grand At Canyon Ranch [Member] Colonial Grand at Double Creek (Austin, TX) [Member] Colonial Grand At Double Creek Austin Tx Colonial Grand At Double Creek Austin Tx [Member] Colonial Grand at Onion Creek [Member] Colonial Grand At Onion Creek Colonial Grand At Onion Creek [Member] Grand Reserve at Sunset Valley [Member] Grand Reserve At Sunset Valley Grand Reserve At Sunset Valley [Member] Colonial Village at Quarry Oaks [Member] Colonial Village At Quarry Oaks Colonial Village At Quarry Oaks [Member] Colonial Grand at Wells Branch [Member] Colonial Grand At Wells Branch Colonial Grand At Wells Branch [Member] Legacy at Western Oaks [Member] Legacy At Western Oaks Legacy At Western Oaks [Member] Post Barton Creek [Member] Post Barton Creek Post Barton Creek [Member] Post Park Mesa [Member] Post Park Mesa Post Park Mesa [Member] Post South Lamar [Member] Post South Lamar Post South Lamar [Member] Post South Lamar II [Member] Post South Lamar I I Post South Lamar I I [Member] Post West Austin [Member] Post West Austin Post West Austin [Member] Silverado [Member] Silverado Silverado [Member] Stassney Woods [Member] Stassney Woods Stassney Woods [Member] Sixty 600 [Member] Sixty600 Sixty600 [Member] Woods on barton skyway [Member] Woods On Barton Skyway Woods On Barton Skyway [Member] Colonial Village at Shoal Creek [Member] Colonial Village At Shoal Creek Colonial Village At Shoal Creek [Member] Colonial Village at Willow Creek [Member] Colonial Village At Willow Creek Colonial Village At Willow Creek [Member] Colonial grand at hebron member. Colonial Grand At Hebron Colonial Grand At Hebron [Member] Colonial Grand at Silverado [Member] Colonial Grand At Silverado Colonial Grand At Silverado [Member] Colonial Grand at Silverado Reserve [Member] Colonial Grand At Silverado Reserve Colonial Grand At Silverado Reserve [Member] Grand Cypress [Member] Grand Cypress Grand Cypress [Member] Courtyards at campbell. Courtyards at Campbell Courtyards At Campbell [Member] Deer run. Deer Run Deer Run [Member] Grand Courtyard. Grand Courtyard Grand Courtyard [Member] Legends at Lowe's Farm. Legends at Lowe's Farm Legends At Lowes Farm [Member] Colonial Reserve at Medical District. Colonial Reserve At Medical District Colonial Reserve At Medical District [Member] Post Abbey. Post Abbey Post Abbey [Member] Post Addison Circle. Post Addison Circle Post Addison Circle [Member] Post Cole's Corner. Post Cole's Corner Post Coles Corner [Member] Post Eastside. Post Eastside Post Eastside [Member] Post Gallery. Post Gallery Post Gallery [Member] Post Heights. Post Heights Post Heights [Member] Post Katy Trail. Post Katy Trail Post Katy Trail [Member] Post Legacy. Post Legacy Post Legacy [Member] Post Meridian Post Meridian Post Meridian [Member] Post Sierra at Frisco Bridges Post Sierra At Frisco Bridges Post Sierra At Frisco Bridges [Member] Post Square Post Square Post Square [Member] Post Uptown Village. Post Uptown Village Post Uptown Village [Member] Post Vineyard. Post Vineyard Post Vineyard [Member] Post Vintage. Post Vintage Post Vintage [Member] Post Worthington. Post Worthington Post Worthington [Member] Watermark. Watermark Watermark [Member] Colonial Grand at Bear Creek. Colonial Grand At Bear Creek Colonial Grand At Bear Creek [Member] Colonial Grand at Fairview. Colonial Grand At Fairview [Member] Colonial Grand At Fairview [Member] La Valencia at Starwood. La Valencia At Starwood La Valencia At Starwood [Member] Colonial Reserve at Frisco Bridges. Colonial Reserve At Frisco Bridges Colonial Reserve At Frisco Bridges [Member] Colonial Village at Grapevine. Colonial Village At Grapevine Colonial Village At Grapevine [Member] Greenwood Forest. Greenwood Forest Greenwood Forest [Member] Legacy Pines. Legacy Pines Legacy Pines [Member] Park Place (Houston). Park Place Houston Park Place Houston [Member] Post Midtown Square. Post Midtown Square Post Midtown Square [Member] Post 510. Post510 Post510 [Member] Post Afton Oaks. Post Afton Oaks Post Afton Oaks [Member] Ranchstone. Ranchstone Ranchstone [Member] Reserve at Woodwind Lakes. Reserve At Woodwind Lakes Reserve At Woodwind Lakes [Member] Retreat at Vintage Park. Retreat At Vintage Park Retreat At Vintage Park [Member] Yale at 6th. Yale At6th Yale At6th [Member] Cascade at Fall Creek. Cascade At Fall Creek Cascade At Fall Creek [Member] Bella Casita. Bella Casita Bella Casita [Member] Remington Hills. Remington Hills Remington Hills [Member] Colonial Reserve at Las Colinas. Colonial Reserve At Las Colinas Colonial Reserve At Las Colinas [Member] Colonial Grand at Valley Ranch. Colonial Grand At Valley Ranch Colonial Grand At Valley Ranch [Member] Colonial Village at Oakbend. Colonial Village At Oakbend Colonial Village At Oakbend [Member] Times Square at Craig Ranch. Times Square At Craig Ranch Times Square At Craig Ranch [Member] Venue at Stonebridge Ranch. Venue At Stonebridge Ranch Venue At Stonebridge Ranch [Member] Cityscape at Market Center. Cityscape At Market Center Cityscape At Market Center [Member] Highwood. Highwood Highwood [Member] Los Rios Park. Los Rios Park Los Rios Park [Member] Boulder Ridge. Boulder Ridge Boulder Ridge [Member] Copper Ridge. Copper Ridge Copper Ridge [Member] Colonial Grand at Ashton Oaks. Colonial Grand At Ashton Oaks Colonial Grand At Ashton Oaks [Member] Colonial Grand at Round Rock. Colonial Grand At Round Rock Colonial Grand At Round Rock [Member] Colonial Village at Sierra Vista. Colonial Village At Sierra Vista Colonial Village At Sierra Vista [Member] Alamo Ranch. Alamo Ranch Alamo Ranch [Member] Bulverde Oaks. Bulverde Oaks Bulverde Oaks [Member] Haven at Blanco. Haven At Blanco Haven At Blanco [Member] Stone Ranch at Westover Hills. Stone Ranch At Westover Hills Stone Ranch At Westover Hills [Member] Cypresswood Court. Cypresswood Court Cypresswood Court [Member] Villages at Kirkwood. Villages At Kirkwood Villages At Kirkwood [Member] Green Tree Place. Green Tree Place Green Tree Place [Member] Stonefield Commons. Stonefield Commons Stonefield Commons [Member] Adalay Bay. Adalay Bay Adalay Bay [Member] Colonial Village at Greenbrier. Colonial Village At Greenbrier Colonial Village At Greenbrier [Member] Seasons at Celebrate Virginia. Seasons At Celebrate Virginia Seasons At Celebrate Virginia [Member] Station Square at Cosners Corner. Station Square At Cosner's Corner Station Square At Cosners Corner [Member] Apartments at Cobblestone Square. Apartments At Cobblestone Square Apartments At Cobblestone Square [Member] Colonial Village at Hampton Glen. Colonial Village At Hampton Glen Colonial Village At Hampton Glen [Member] Colonial Village at West End. Colonial Village At West End Colonial Village At West End [Member] Township. Township Township [Member] Colonial Village at Waterford. Colonial Village At Waterford Colonial Village At Waterford [Member] Ashley Park. Ashley Park Ashley Park [Member] Residential Properties. Residential Properties Residential Properties [Member] Retail Properties [Member] Retail Properties Retail Properties [Member] Land Improvements Land Improvements [Member] Corporate Real Estate Owned [Domain] Corporate Real Estate Owned Domain Corporate Real Estate Owned [Domain] Other Real Estate Owned [Member] Other Real Estate Owned Other Real Estate Owned [Member] Colonial Village at Chase Gayton. Colonial Village At Chase Gayton Colonial Village At Chase Gayton [Member] Hamptons at Hunton Park. Hamptons At Hunton Park Hamptons At Hunton Park [Member] Retreat at West Creek. Retreat At West Creek Retreat At West Creek [Member] Retreat at West Creek II. Retreat At West Creek I I Retreat At West Creek I I [Member] Radius. Radius Radius [Member] Post Carlyle Square. Post Carlyle Square Post Carlyle Square [Member] Post Corners at Trinity Center. Post Corners At Trinity Center Post Corners At Trinity Center [Member] Post Fallsgrove. Post Fallsgrove Post Fallsgrove [Member] Post Park. Post Park Post Park [Member] Post Pentagon Row. Post Pentagon Row Post Pentagon Row [Member] Post Tysons Corner. Post Tysons Corner Post Tysons Corner [Member] Total Residential Properties. Total Residential Properties Total Residential Properties [Member] Post Training Facility. Post Training Facility Post Training Facility [Member] Post Riverside Office. Post Riverside Office Post Riverside Office [Member] Colonial Promenade at Huntsville Retail. Colonial Promenade at Huntsville Retail Colonial Promenade At Huntsville Retail [Member] Post Riverside Retail. Post Riverside Retail Post Riverside Retail [Member] 220 Riverside Retail. 220 Riverside Retail A220 Riverside Retail [Member] Allure in Buckhead Retail. Allure in Buckhead Retail Allure In Buckhead Retail [Member] Post Soho Square Retail. Post Soho Square Retail Post Soho Square Retail [Member] Highlands of West Village Retail. Highlands of West Village Retail Highlands Of West Village Retail [Member] Post Parkside Atlanta Retail. Post Parkside Atlanta Retail Post Parkside Atlanta Retail [Member] The Denton Retail. The Denton Retail The Denton Retail [Member] Post Uptown Place Retail. Post Uptown Place Retail Post Uptown Place Retail [Member] A 1225 South Church Retail. 1225 South Church Retail A1225 South Church Retail [Member] Post Uptown Leasing Center. Post Uptown Leasing Center Post Uptown Leasing Center [Member] Bella Casita at Las Colinas Retail. Bella Casita at Las Colinas Retail Bella Casita At Las Colinas Retail [Member] Post Park Maryland Retail. Post Park Maryland Retail Post Park Maryland Retail [Member] Times Square at Craig Ranch Retail. Times Square at Craig Ranch Retail Times Square At Craig Ranch Retail [Member] Post South End Retail. Post South End Retail Post South End Retail [Member] Post Rocky Point Retail. Post Rocky Point Retail Post Rocky Point Retail [Member] Post Gateway Place Retail. Post Gateway Place Retail Post Gateway Place Retail [Member] Post Parkside at Wade Retail. Post Parkside At Wade Retail Post Parkside At Wade Retail [Member] Hue Retail. Hue Retail Hue Retail [Member] Post Parkside Orlando Retail. Post Parkside Orlando Retail Post Parkside Orlando Retail [Member] Post Harbour Place Retail. Post Harbour Place Retail Post Harbour Place Retail [Member] Post Carlyle Square Retail. Post Carlyle Square Retail Post Carlyle Square Retail [Member] Post Coles Corner Retail. Post Coles Corner Retail Post Coles Corner Retail [Member] Post Square Retail. Post Square Retail Post Square Retail [Member] Post Worthington Retail. Post Worthington Retail Post Worthington Retail [Member] Post Heights Retail. Post Heights Retail Post Heights Retail [Member] Post Eastside Retail. Post Eastside Retail Post Eastside Retail [Member] Post Addison Circle Retail. Post Addison Circle Retail Post Addison Circle Retail [Member] Post Addison Circle Office. Post Addison Circle Office Post Addison Circle Office [Member] Post Sierra Frisco Bridges Retail. Post Sierra Frisco Bridges Retail Post Sierra Frisco Bridges Retail [Member] Post Katy Trail Retail. Post Katy Trail Retail Post Katy Trail Retail [Member] Post Midtown Square Retail. Post Midtown Square Retail Post Midtown Square Retail [Member] Rise Condo Devel LP Retail. Rise Condo Devel L P Retail Rise Condo Devel L P Retail [Member] Post Legacy Retail. Post Legacy Retail Post Legacy Retail [Member] Post South Lamar Retail. Post South Lamar Retail Post South Lamar Retail [Member] Total retail commercial Properties. Total Retail/Commercial Properties Total Retail Commercial Properties [Member] Copper Ridge II. Copper Ridge I I Copper Ridge I I [Member] MAA at Frisco Bridges II. M A A At Frisco Bridges I I M A A At Frisco Bridges I I [Member] Westglenn [Member]. Westglenn Westglenn [Member] Longpoint. Longpoint Longpoint [Member] 336 N Orange [Member]. 336 N Orange A336 N Orange [Member] Total Active Development Properties. Total Active Development Properties Total Active Development Properties [Member] The Greene Retail. The Greene Retail The Greene Retail [Member] Total Properties. Total Properties Total Properties [Member] Total Land Held for Future Developments. Total Land Held For Future Developments Total Land Held For Future Developments [Member] Corporate Properties. Corporate Properties Corporate Properties [Member] Total Other. Total Other Total Other [Member] Total Real Estate Assets, net of Joint Ventures. Total Real Estate Assets Net Of Joint Total Real Estate Assets Net Of Joint [Member] Real Estate And Accumulated Depreciation [Line Items] Real Estate And Accumulated Depreciation [Line Items] Location Real Estate Geographic Location Of Property1 Encumbrances Real Estate And Accumulated Depreciation Amount Of Encumbrances Initial Cost Land Real Estate And Accumulated Depreciation Initial Cost Of Land Initial Cost Buildings and Fixtures Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements Costs Capitalized Subsequent to Acquisition Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Carrying Costs Gross Amount, Land Real Estate And Accumulated Depreciation Carrying Amount Of Land Gross Amount, Buildings and Fixtures Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements Total Real Estate Gross At Carrying Value Accumulated Depreciation Real Estate Accumulated Depreciation Net Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements Net SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Real Estate And Accumulated Depreciation Year Of Construction SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Real Estate And Accumulated Depreciation Year Of Acquisition Encumbrance 1 [Member] Encumbrance1 Encumbrance1 [Member] Encumbrance 2 [Member] Encumbrance2 Encumbrance2 [Member] Encumbrance 3 [Member]. Encumbrance3 Encumbrance3 [Member] Loans Loans [Member] Furniture, Fixtures and Equipment [Member] Furniture Fixtures And Equipment Furniture Fixtures And Equipment [Member] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Federal Income Tax Basis Real Estate Federal Income Tax Basis Amount of bond used as encumbrance Long Term Debt Derivative cap interest rate (percent) Derivative Cap Interest Rate Derivative termination date Derivative Maturity Dates Real Estate, Improvements and Developments Disposal Group, Held-for-sale, Not Discontinued Operations Disposal Group Heldforsale Not Discontinued Operations [Member] Real estate investments: Reconciliation Of Carrying Amount Of Real Estate Investments Roll Forward Balance at beginning of year Acquisitions Real Estate Other Acquisitions Less: FMV of leases included in acquisitions Capital Leased Assets Gross Improvement and development Real Estate Improvements And Developments Disposition of real estate assets Real Estate Cost Of Real Estate Sold Balance at end of year Accumulated depreciation: Reconciliation Of Real Estate Accumulated Depreciation Roll Forward Balance at beginning of year Depreciation S E C Schedule I I I Real Estate Accumulated Depreciation Depreciation Expense Disposition of real estate assets Real Estate Accumulated Depreciation Real Estate Sold Balance at end of year