Fair Value Disclosures [Abstract] Derivative Instruments, Gain (Loss) [Table Text Block] Derivative Instruments, Gain (Loss) [Table Text Block] Shareholders' Equity of MAA [Abstract] Shareholders' Equity of MAA [Abstract] Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Note Disclosure [Text Block] MAA Equity [Abstract] MAA Equity [Abstract] Shareholders' Equity [Table Text Block] Shareholders' Equity [Table Text Block] Shareholders' Equity [Table Text Block] Disclosure - Derivatives and Hedging Activities - Additional Information [Abstract] Disclosure - Derivatives and Hedging Activities - Additional Information [Abstract] Derivative [Table] Derivative [Table] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] net liability position [Member] net liability position [Member] net liability position [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Conventional Variable Rate Debt [Member] Conventional Variable Rate Debt [Member] Conventional Variable Rate Debt [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Fixed Rate Debt Fixed Rate Debt [Member] Fixed Rate Debt [Member] Floating Rate Debt [Member] Floating Rate Debt [Member] Floating Rate Debt [Member] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Parent Company [Member] Parent Company [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Interest Rate Swap Interest Rate Swap [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation Hedging Designation [Domain] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement and Other Comprehensive Income (Loss) Location [Domain] Income Statement Location [Domain] Interest Expense Interest Expense [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Derivative Instruments, Gain (Loss) by Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Derivative Derivative [Line Items] Credit Risk Related Contingent Features Termination Value Credit Risk Related Contingent Features Termination Value Credit Risk Related Contingent Features, Termination Value Notes Payable Excluding Interest Rate Swaps and Cap Agreements 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 Derivative Instruments, Gain (Loss) Recognized in Income, Net Derivative, Gain (Loss) on Derivative, Net 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 OCI to Income, Estimated Net Amount to be Transferred Preferred Stock, Redemption Price Per Share Preferred Stock, Redemption Price Per Share Embedded Derivative, Fair Value of Embedded Derivative Asset Embedded Derivative, Fair Value of Embedded Derivative Asset New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification Debt Renewal Period Debt Renewal Period Debt Renewal Period 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 Date Preferred Stock, Redemption Date Derivative, Number of Instruments Held Derivative, Number of Instruments Held Derivative, Notional Amount Derivative, Notional Amount Consolidated Statements of Comprehensive Income [Abstract] Consolidated Statements of Comprehensive Income [Abstract] Statement [Table] Statement [Table] Partner Type [Axis] Partner Type [Axis] Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] Limited Partner [Member] Limited Partner [Member] Statement [Line Items] Statement [Line Items] Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Consolidated net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Unrealized (loss) gain from the effective portion of derivative instruments Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: comprehensive income attributable to noncontrolling interests Comprehensive Income Attributable to Noncontrolling Interest Comprehensive Income Attributable to Noncontrolling Interest Comprehensive income attributable to MAA Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income attributable to Mid-America Apartments, L.P. Comprehensive Income, Net of Tax, Attributable to Parent Comprehensive Income, Net of Tax, Attributable to Parent Equity Disclosure [Table] Equity Disclosure [Table] Equity Disclosure [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Stockholders' Equity, Total [Member] Stockholders' Equity, Total [Member] Adjustments for Error Corrections [Axis] Adjustments for Error Corrections [Axis] Adjustments for Error Correction [Domain] Adjustments for Error Correction [Domain] 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] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Preferred Stock [Member] Preferred Stock [Member] Preferred Stock Including Additional Paid in Capital [Member] Preferred Stock Including Additional Paid in Capital [Member] Common Stock [Member] Common Stock [Member] Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] Common Stock Including Additional Paid in Capital [Member] Common Stock Including Additional Paid in Capital [Member] Equity [Line Items] Equity [Line Items] Equity [Line Items] Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Noncontrolling Interest in Joint Ventures Noncontrolling Interest in Joint Ventures Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance Stockholders' Equity Including Noncontrolling Interest Stockholders' Equity Including Noncontrolling Interest Net income attributable to MAA Net Income Attributable to Parent Net Income Attributable to Parent Net Income Attributable to Noncontrolling Interest Net Income Attributable to Noncontrolling Interest Net Income Attributable to Noncontrolling Interest Net Income Including Portion Attributable to Noncontrolling Interest Net Income Including Portion Attributable to Noncontrolling Interest Net Income Including Portion Attributable to Noncontrolling Interest Other comprehensive (loss) income - derivatives insturments (cash flow hedges) Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Issuance and registration of common shares Stock Issued During Period, Value, New Issues Preferred Stock, Value, Outstanding Preferred Stock, Value, Outstanding Shares repurchased and retired Stock Repurchased and Retired During Period, Value Stock Issued During Period, Value, Stock Options Exercised Stock Issued During Period, Value, Stock Options Exercised Shares issued in exchange for units Stock Issued During Period, Value, Conversion of Units Shares issued in exchange for redeemable stock Stock Issued in Exchange for Redeemable Stock Stock Issued in Exchange for Redeemable Stock Redeemable stock fair market value Effect On Retained Earnings Accumulated Deficit Due To Fair Value Option And Measurement Fair value option and measurement. Adjustment for noncontrolling interest ownership in operating partnership Noncontrolling Interest, Period Increase (Decrease) Amortization of unearned compensation Amortization Unearned Compensation Amortization of unearned compensation Dividends, Preferred Stock, Cash Dividends, Preferred Stock, Cash Dividends on common stock Dividends, Common Stock Dividends on noncontrolling interest units Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Ending Balance Distribution Made to Limited Partner, Distributions Declared, Per Unit Distribution Made to Limited Partner, Distributions Declared, Per Unit Other Noncontrolling Interests Other Noncontrolling Interests Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Statement, Business Segments [Axis] Segments [Axis] Segments [Domain] Segments [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 Real Estate Properties Number of States in which Entity Operates Number of States in which Entity Operates Period properties owned and stabilized Period properties owned and stabilized Period properties owned and stabilized Occupancy Level for Stabilized Communities Occupancy Level for Stabilized Communities Occupancy Level for Stabilized Communities Period Properties Stabilized Period Properties Stabilized Period Properties Stabilized Real Estate Acquisitions and Dispositions [Abstract] Real Estate Acquisitions and Dispositions [Abstract] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Novel Midtown [Member] Novel Midtown [Member] [Member] Novel Midtown [Member] [Member] Peachtree Road - outparcel [Member] Peachtree Road - outparcel [Member] Peachtree Road - outparcel [Member] Poplar Avenue Office [Member] [Member] Poplar Avenue Office [Member] [Member] Poplar Avenue Office [Member] [Member] Business Acquisitions and Dispositions [Line Items] Acquisitions and Disposals [Line Items] Acquisitions and Disposals [Line Items] Number of Units in Real Estate Property Number of Units in Real Estate Property Area of Land Area of Land Square Footage of Real Estate Property Area of Real Estate Property Disclosure - Share and Unit Information - Additional Information [Abstract] Disclosure - Share and Unit Information - Additional Information [Abstract] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Redeemable Preferred Stock [Member] Redeemable Preferred Stock [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Employee Stock Option [Member] Employee Stock Option [Member] Derivative Contract [Domain] Equity Option [Member] Equity Option [Member] Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Preferred Stock, Liquidation Preference Per Share Preferred Stock, Liquidation Preference Per Share Common stock, shares outstanding Common Stock, Shares, Outstanding Common Shares Issuable Upon Conversion Of Convertible Stock 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 Common Shares and Operating Partnership Units, Outstanding Common stock shares, outstanding option Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Proceeds from Stock Options Exercised Proceeds from Stock Options Exercised Preferred Stock, Dividend Rate, Percentage Preferred Stock, Dividend Rate, Percentage Preferred Stock, Dividend Rate, Per-Dollar-Amount Preferred Stock, Dividend Rate, Per-Dollar-Amount Preferred Stock, Liquidation Preference, Value Preferred Stock, Liquidation Preference, Value Notes To Financial Statements [Abstract] Notes to Financial Statements [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Debt Disclosure [Abstract] Schedule of Debt [Table Text Block] Schedule of Debt [Table Text Block] Earnings Per Common Share of MAA [Abstract] Earnings Per Common Share of MAA [Abstract] Earnings Per Share [Text Block] Earnings Per Share [Text Block] Real Estate Acquisitions and Dispositions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Income Statement [Abstract] Operating revenues: Revenues [Abstract] Total operating revenues Revenues Property operating expenses: Operating Costs and Expenses [Abstract] Total property operating expenses Operating Costs and Expenses Real estate taxes and insurance Real Estate Taxes and Insurance Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Operating Expenses Operating Expenses Other Cost and Expense, Operating Other Cost and Expense, Operating General and administrative expenses General and Administrative Expense Business Combination, Merger and Integration Related Expenses Business Combination, Merger and Integration Related Expenses Business Combination, Merger and Integration Related Expenses Interest expense Interest Expense Gain (Loss) on sale of depreciable real estate assets excluded from discontinued operations Gain (Loss) on Disposition of Property Plant Equipment Gain on sale of non-depreciable real estate assets Gain (Loss) on Disposition of Other Assets Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Income before income tax expense Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense Income Tax Expense Income from continuing operations before joint venture activity Income (Loss) from Continuing Operations before Equity Method Investments Income (Loss) from Continuing Operations before Equity Method Investments Gain (loss) from real estate joint ventures Income (Loss) from Equity Method Investments Consolidated net income Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net income available for shareholders Net Income (Loss) Attributable to Parent Preferred Stock Dividends, Income Statement Impact Preferred Stock Dividends, Income Statement Impact Preferred Unit Dividends, Income Statement Impact Preferred Unit Dividends, Income Statement Impact preferred unit dividend, income statement Net income available for MAA common shareholders Net Income (Loss) Available to Common Stockholders, Basic Net income available for Mid-America Apartments, L.P. common unitholders Net Income (Loss) Available to Common Unitholders, Basic Net Income (Loss) Available to Common Unitholders, Basic Earnings per common share - basic: Earnings Per Share, Basic [Abstract] Earnings Per Share, Basic Earnings Per Share, Basic Earnings per unit - basic Basic Earnings Per Unit Basic Earnings Per Unit Earnings per common share - diluted: Earnings Per Share, Diluted [Abstract] Earnings Per Share, Diluted Earnings Per Share, Diluted Earnings per unit - diluted Diluted Earnings Per Unit Diluted Earnings Per Unit Real Estate [Abstract] Real Estate [Table] Real Estate [Table] Real Estate [Line Items] Real Estate [Line Items] Schedule of Real Estate Asset Acquisitions and Dispositions [Table Text Block] Schedule of Real Estate Asset Acquisitions and Dispositions [Table Text Block] Schedule of Real Estate Asset Acquisitions and Dispositions [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] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-02 [Member] Accounting Standards Update 2016-02 [Member] Real Estate Property Ownership [Axis] Real Estate Property Ownership [Axis] Real Estate Properties [Domain] Real Estate Properties [Domain] Real Estate Technology Ventures, L.P. [Member] Real Estate Technology Ventures, L.P. [Member] Real Estate Technology Ventures, L.P. [Member] Post River North [Member] Post River North [Member] Post River North [Member] Post Massachusetts Avenue [Member] Post Massachusetts Avenue [Member] Post Massachusetts Avenue [Member] Phoenix Midtown [Member] [Domain] Phoenix Midtown [Member] [Domain] Phoenix Midtown [Member] [Domain] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Development Properties [Member] Development Properties [Member] Development Properties [Member] Retail Retail [Member] Commercial Real Estate [Member] Commercial Real Estate [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Expected Costs [Member] Expected Costs [Member] Expected Costs [Member] Costs Incurred to Date [Member] Costs Incurred to Date [Member] Costs Incurred to Date [Member] Limited Partner Capital Contribution, Future Obligation [Member] Limited Partner Capital Contribution, Future Obligation [Member] Limited Partner Capital Contribution, Future Obligation [Member] Real Estate Properties [Line Items] Real Estate Properties [Line Items] General Partners' Capital Account, Units Outstanding General Partners' Capital Account, Units Outstanding Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Equity Method Investment, Ownership Percentage Equity Method Investment, Ownership Percentage Number of units under development community Number of units under development community Property Held for Development Development and capital improvements in progress Construction in Progress, Gross Percentage Of Ownership Interests Percentage Of Ownership Interests Percentage Of Ownership Interests Real Estate Investments, Joint Ventures Real Estate Investments, Joint Ventures Number of apartments included in a community Buildings, Improvements, and Other Buildings, Improvements, and Other 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. Land Land Accrued expenses and other liabilities Accrued Liabilities Percentage Of Rental Revenue From Leasing Of Apartment Homes Percentage Of Rental Revenue And Other Income From Leasing Of Apartment Homes 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 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 Percentage of Rental Revenue and Other Income From Non-leasing Activities Percentage of Rental Revenue and Other Income From Non-leasing Activities Property Management Fee Revenue Property Management Fee Revenue 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 Term Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Loss Contingency [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [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] Litigation Status [Axis] Litigation Status [Axis] Litigation Status [Domain] Litigation Status [Domain] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Loss Contingency, Estimate of Possible Loss Loss Contingency, Estimate of Possible Loss Loss Contingency Accrual Loss Contingency Accrual 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 adjustment Net present value adjustment Net present value adjustment 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 Non Same Store And Other [Member] 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 Other Operating Income Other Operating Income Net Operating Income Operating Income Before Depreciation Represents total operating revenues less property operating expenses, excluding depreciation. Depreciation and amortization General and administrative expense Business Combination, Merger and Integration Related Expenses Gain (Loss) on sale of depreciable real estate assets excluded from discontinued operations Gain on sale of non-depreciable real estate assets Other Nonoperating Income (Expense) Net income attributable to noncontrolling interests Preferred Stock Dividends, Income Statement Impact Earnings Per Share Disclosure [Table] Earnings Per Share Disclosure [Table] Earnings Per Share Disclosure [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Limited Partnership Units [Member] Limited Partnership Units [Member] Limited Partnership Units [Member] Restricted Stock [Member] Restricted Stock [Member] Calculation of Basic Earnings per Share [Member] Calculation of Basic Earnings per Share [Member] Calculation of Basic Earnings per Share [Member] Calculation of Diluted Earnings per Share [Member] Calculation of Diluted Earnings per Share [Member] Calculation of Diluted Earnings per Share [Member] Earnings Per Share Disclosure [Line Items] Earnings Per Share Disclosure [Line Items] Earnings Per Share Disclosure [Line Items] Income from continuing operations attributable to noncontrolling interests Income from Continuing Operations Attributable to Noncontrolling Interest Income from Continuing Operations Attributable to Noncontrolling Interest Income from continuing operations allocated to unvested restricted shares 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 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 Basic Earnings Per Share Basic Earnings Per Share Effect of dilutive securities Weighted Average Number Diluted Shares Outstanding Adjustment Weighted average common shares - diluted Weighted Average Number of Shares Outstanding, Diluted Adjusted Income (Loss) from Continuing Operations Available for Common Shareholders, Diluted Adjusted Income (Loss) from Continuing Operations Available for Common Shareholders, Diluted Adjusted Income (Loss) from Continuing Operations Available for Common Shareholders, Diluted Earnings per share - diluted Diluted Earnings Per Share Diluted Earnings Per Share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 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 Segment [Member] Segment Reporting, Asset Reconciling Item [Line Items] Segment Reporting, Asset Reconciling Item [Line Items] Total assets Assets MAALP Capital [Abstract] MAALP Capital [Abstract] Consolidated Statements of Changes in Capital [Text Block] Consolidated Statements of Changes in Capital [Text Block] Consolidated Statements of Changes in Capital [Text Block] Disclosure - Debt Structure [Abstract] Disclosure - Debt Structure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Average [Axis] Average [Axis] Average [Axis] Average [Domain] Average [Domain] [Domain] for Average [Axis] years to maturity [Member] years to maturity [Member] years to maturity [Member] Secured Debt [Member] Secured Debt [Member] Unsecured Debt [Member] Unsecured Debt [Member] Wells Fargo Term Loan [Member] Wells Fargo Term Loan [Member] Wells Fargo Term Loan [Member] Variable Rate Debt [Member] Variable Rate Debt [Member] Variable Rate Debt [Member] Mortgages [Member] Mortgages [Member] Term Loan [Member] Term Loan [Member] Term Loan [Member] Senior Notes [Member] Senior Notes [Member] $1 billion unsecured revolving credit facility [Member] $1 billion unsecured revolving credit facility [Member] $1 billion unsecured revolving credit facility [Member] Wells Fargo Term Loan 2019 [Member] Wells Fargo Term Loan 2019 [Member] Wells Fargo Term Loan 2019 [Member] Debt Information [Axis] Debt Information [Axis] Debt Information [Axis] Debt Information [Domain] Debt Information [Domain] Debt Information [Domain] 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] Debt Instrument [Line Items] Debt Instrument [Line Items] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Total Outstanding Debt Notes Payable Debt Instrument, Interest Rate, Effective Percentage Debt Instrument, Interest Rate, Effective Percentage Contract Maturity Debt Instrument, Maturity Date Unsecured Debt Unsecured Debt Debt Instrument, Face Amount Debt Instrument, Face Amount Line of Credit Facility, Amount Outstanding Long-term Line of Credit Earnings Per OP Unit of MAALP [Abstract] Earnings Per OP Unit of MAALP [Abstract] Schedule of Earnings Per Unit, Basic and Diluted [Table Text Block] Schedule of Earnings Per Unit, Basic and Diluted [Table Text Block] Schedule of Earnings Per Unit, Basic and Diluted [Table Text Block] Shareholders' Equity of MAA Preferred Stock [Abstract] Shareholders' Equity of MAA Preferred Stock [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Schedule of Stock by Class [Table Text Block] Schedule of Stock by Class [Table Text Block] Notes Payable Debt Disclosure [Text Block] Earnings Per Unit [Text Block] Earnings Per Unit [Text Block] Earnings Per Unit [Text Block] Legal Matters and Contingencies [Text Block] Legal Matters and Contingencies [Text Block] Partners' Capital [Table Text Block] Partners' Capital [Table Text Block] Partners' Capital [Table Text Block] Consolidation and Basis of Presentation and Significant Accounting Policies [Abstract] Consolidation and Basis of Presentation and Significant Accounting Policies [Abstract] Consolidation and Basis of Presentation and Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Revenues and NOI for Reportable Segment Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Assets for Reportable Segment Reconciliation of Assets from Segment to Consolidated [Table Text Block] Fair Value Disclosures [Text Block] Fair Value Disclosures [Text Block] Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events [Text Block] Disclosure - Notes Payable - Additional Information [Abstract] Disclosure - Notes Payable - Additional Information [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] US Bank Term Loan [Member] US Bank Term Loan [Member] US Bank Term Loan [Member] $1 billion unsecured revolving credit faciltiy [Member] $1 billion unsecured revolving credit faciltiy [Member] $1 billion unsecured revolving credit faciltiy [Member] KeyBank Term Loan [Member] KeyBank Term Loan [Member] KeyBank Term Loan [Member] Public Income Notes [Member] Public Income Notes [Member] Private Placement [Member] Private Placement [Member] 3.95% Notes due 2029 [Member] [Domain] 3.95% Notes due 2029 [Member] [Domain] 3.95% Notes due 2029 [Member] [Domain] 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 Notes Payable Unsecured notes payable 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 Debt Issuance Costs, Gross Proceeds from Debt, Net of Issuance Costs Proceeds from Debt, Net of Issuance Costs Settlement of Forward Swaps Settlement of Forward Swaps Settlement of Forward Swaps Debt Instrument, Term Debt Instrument, Term Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Interest Rate, Effective Percentage Proceeds from Loan Originations Proceeds from Loan Originations Debt Instrument, Maturity Date Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Partners' Capital of Mid-America Apartments, L.P. [Abstract] Partners' Capital of Mid-America Apartments, L.P. [Abstract] Partners' Capital Notes Disclosure [Text Block] Partners' Capital Notes Disclosure [Text Block] Capital Disclosure [Table] Capital Disclosure [Table] Capital Disclosure [Table] Partner Capital Components [Axis] Partner Capital Components [Axis] Limited Partners' Capital Account, Class [Domain] Partner Capital Components [Domain] General Partners' Capital Account [Member] General Partners' Capital Account [Member] General Partners' Capital Account [Member] Total Partnership Capital [Member] Total Partnership Capital [Member] Total Partnership Capital [Member] AOCI Attributable to Noncontrolling Interest [Member] AOCI Attributable to Noncontrolling Interest [Member] Capital Disclosure [Line Items] Capital Disclosure [Line Items] [Line Items] for Capital Disclosure [Table] Increase (Decrease) in Partners' Capital [Roll Forward] Increase (Decrease) in Partners' Capital [Roll Forward] Beginning Balance Partners' Capital Net Income Allocated to Limited Partners Net Income (Loss) Allocated to Limited Partners Net Income Allocated to General Partners Net Income (Loss) Allocated to General Partners Net Income Available for Common Unitholders Net Income Available for Common Unitholders Net Income Available for Common Unitholders Issuance of units Units Issued During Period, Value, New Issues Units Issued During Period, Value, New Issues Units repurchased and retired Units Repurchased and Retired During Period, Value Units Repurchased and Retired During Period, Value Units Issued During Period, Value, Unit Options Exercised Units Issued During Period, Value, Unit Options Exercised Units Issued During Period, Value, Unit Options Exercised General partner units issued in exchange for limited partner units General Partnership Units Issued in Exchange for Limited Partnership Units General Partnership Units Issued in Exchange for Limited Partnership Units Units issued in exchange for redeemable units Partnership units issued in exchange for redeemable units Partnership units issued in exchange for redeemable units Distributions Distributions Distributions Ending Balance Document Documentand Entity Information [Abstract] Document - Document and Entity Information [Abstract] Entities [Table] Entities [Table] 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 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 Current Reporting Status Entity Current Reporting Status Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Disclosure Outstanding Interest Rate Derivatives Designated As Cash Flow Hedges Of Interest Rate Risk [Abstract] Disclosure - Outstanding Interest Rate Derivatives Designated as Cash Flow Hedges of Interest Rate Risk [Abstract] Number of Instruments Basis of Presentation and Principles of Consolidation [Abstract] Basis of Presentation and Principles of Consolidation [Abstract] Basis Of Presentation And Principles Of Consolidation Policy [Policy Text Block] Basis Of Presentation And Principles Of Consolidation Policy [Policy Text Block] Basis of presentation and principles of consolidation, policy. Disclosure Outstanding Interest Rate Derivatives Not Designated As Hedges [Abstract] Disclosure - Outstanding Interest Rate Derivatives Not Designated as Hedges [Abstract] Statement of Financial Position [Abstract] Assets: Assets [Abstract] 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 Land Available for Development Investments in real estate joint ventures Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Real estate assets, net 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 Liabilities and Shareholders' Equity: Liabilities and Equity [Abstract] Liabilities: Liabilities [Abstract] Secured notes payable Secured Debt Total liabilities Liabilities Redeemable stock Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Shareholders' equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] 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 income (losses) Accumulated Other Comprehensive Income (Loss), Net of Tax Total MAA shareholders' equity Stockholders' Equity Attributable to Parent Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Total equity Permanent Equity Attributable to Parent and Noncontrolling Interest Permanent Equity Attributable to Parent and Noncontrolling Interest Permanent Equity Attributable to Parent and Noncontrolling Interest Total liabilities and equity Liabilities and Equity Redeemable stock, shares issued and outstanding Temporary Equity, Shares Outstanding 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) [Table] Interest Rate Contract Interest Rate Contract [Member] Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Schedule of Capital Structure [Table] Schedule of Capital Structure [Table] Schedule of Capital Structure [Table] Schedule of Capital Structure [Line Items] Schedule of Capital Structure [Line Items] [Line Items] for Schedule of Capital Structure [Table] Operating partnership units outstanding Operating partnership units outstanding Operating Partnership Units, Outstanding Limited Partners' Capital Account, Units Outstanding Limited Partners' Capital Account, Units Outstanding Limited Partners' Capital Account Limited Partners' Capital Account 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 Consolidated Statements of Equity [Text Block] Consolidated Statements of Equity [Text Block] Consolidated Statements of Equity [Text Block] MAALP Condensed Consolidated Balance Sheets [Abstract] MAALP Condensed Consolidated Balance Sheets [Abstract] Liabilities and Capital [Abstract] Liabilities and Capital [Abstract] Liabilities and Capital [Abstract] Due to general partner Due to Related Parties, Current Redeemable units Capital [Abstract] Capital [Abstract] Preferred Units, Preferred Partners' Capital Accounts Preferred Units, Preferred Partners' Capital Accounts General Partners' Capital Account General Partners' Capital Account Capital Capital Partners' Capital, Including Portion Attributable to Noncontrolling Interest Partners' Capital, Including Portion Attributable to Noncontrolling Interest Total Liabilities and Capital Liabilities and Capital Liabilities and Capital Redeemable units, units issued and outstanding Subsequent Event [Table] Subsequent Event [Table] Subsequent Event [Line Items] Subsequent Event [Line Items] 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 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, Shares Issued Preferred Stock, Shares Issued Preferred Units, Issued Preferred Units, Issued Preferred Units, Outstanding Preferred Units, Outstanding Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Consolidated net income 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 excluded from discontinued operations Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Gain on sale of non-depreciable real estate assets Gain on Sale of Non-Depreciable Assets Gain on Sale of Non-Depreciable Assets Stock compensation expense Share-based Compensation Amortization of debt premium Amortization of Debt Discount (Premium) Proceeds from Other Operating Activities Proceeds from Other Operating Activities 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 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. Normal capital improvements Payments for Capital Improvements Proceeds from Equity Method Investment, Distribution, Return of Capital Proceeds from Equity Method Investment, Distribution, Return of Capital Contributions to Real Estate Joint Ventures Contributions to Real Estate Joint Ventures Contributions to Real Estate Joint Ventures Proceeds from disposition of real estate assets Proceeds from Sale of Real Estate Held-for-investment Net cash (used in) provided by 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 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 Ordinary Dividends, Noncontrolling Interest Distributions paid on common units Distributions Paid on Common Units Distributions Paid on Common Units Dividends paid on common shares Payments of Ordinary Dividends, Common Stock Dividends, Preferred Stock, Cash Proceeds from (Payments for) 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 (decrease) increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] 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, Excluding Capitalized Interest, Operating Activities 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 units to shares of common stock Conversion of Stock, Amount Converted Accrued construction in progress Construction in Progress Expenditures Incurred but Not yet Paid Interest capitalized Interest Costs Capitalized Marked To Market Adjustment On Derivative Instruments Marked To Market Adjustment On Derivative Instruments Marked to Market Adjustment on Derivative Instruments Net Loss or Income Per Unit Disclosure [Table] Net Loss or Income Per Unit Disclosure [Table] Net Loss or Income Per Unit Disclosure [Table] Calculation of Basic Earnings Per Unit [Member] Calculation of Basic Earnings Per Unit [Member] Calculation of Basic Earnings Per Unit [Member] Calculation of Diluted Earnings Per Unit [Member] Calculation of Diluted Earnings Per Unit [Member] Calculation of Diluted Earnings Per Unit [Member] Income from continuing operations available for common unitholders, adjusted Adjusted Income (Loss) from Continuing Operations Available for Common Unitholders Adjusted Income (Loss) from Continuing Operations Available for Common Unitholders Weighted average common units - basic Weighted Average Number of Limited Partnership and General Partnership Unit Outstanding, Basic and Diluted