Operating expenses, excluding property taxes Cost of Other Property Operating Expense Oakland - East Bay, CA Oakland - East Bay, CA [Member] Oakland - East Bay, CA [Member] eaves Thousand Oaks eaves Thousand Oaks [Member] Represents the information pertaining to Eaves Thousand Oaks, located at Thousand Oaks, CA. eaves Warner Center eaves Warner Center [Member] Represents the information pertaining to Eaves Warner Center, located at Woodland Hills, CA. Avalon Irvine III Avalon Irvine III [Member] Avalon Irvine III [Member] Award Timing Predetermined Award Timing Predetermined [Flag] eaves Phillips Ranch eaves Phillips Ranch [Member] Represents the information pertaining to Eaves Phillips Ranch, located at Pomona, CA. Entity File Number Entity File Number Rental income from real estate assets sold or held for sale Revenue From Assets Held for Sale, Not Classified As Discontinued Operations Revenue From Assets Held for Sale, Not Classified as Discontinued Operations Additional paid-in capital Additional Paid-in Capital [Member] eaves South Coast eaves South Coast [Member] Represents the information pertaining to Eaves South Coast, located at Costa Mesa, CA. Segment Operating Expenses [Domain] Segment Operating Expenses [Domain] Segment Operating Expenses [Domain] Quarterly Installment Quarterly Installment [Member] Quarterly Installment Tabular List, Table Tabular List [Table Text Block] Management, Development And Other Management, Development And Other [Member] Management, Development And Other [Member] Recently Issued and Adopted Accounting Standards and Change in Accounting Principle New Accounting Pronouncements, Policy [Policy Text Block] Properties on Land Subject to Land Leases Properties on Land Subject to Land Leases [Member] Real estate assets located on land subject to land leases. Right of use lease assets Lease, Right-Of-Use Asset Lease, Right-Of-Use Asset Avalon Townhome Collection Brier Creek Avalon Townhome Collection Brier Creek [Member] Avalon Townhome Collection Brier Creek Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Related Party Arrangements Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Catastrophic Event [Axis] Catastrophic Event [Axis] Avalon Woodland Hills Avalon Woodland Hills [Member] Represents the information pertaining to Avalon Woodland Hills, located at Woodland Hills, CA. Notes Payable 5.300 Maturities 2033 Notes Payable 5.300 Maturities 2033 [Member] Notes Payable 5.300 Maturities 2033 2024 Acquisition 2024 Acquisition [Member] 2024 Acquisition Issuance of unsecured debt Proceeds from Unsecured Notes Payable Building / Construction in Progress & Improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Building and Improvements, Amount eaves Peabody eaves Peabody [Member] Represents the information pertaining to Eaves Peabody, located at Peabody, MA. Stock, Class of Stock [Table] Stock, Class of Stock [Table] Avalon Princeton on Harrison Avalon Princeton on Harrison [Member] Avalon Princeton on Harrison Common shares issued under Employee Stock Purchase Plan (in shares) Shares issued under Employee Stock Purchase Plan Stock Issued During Period, Shares, Employee Stock Purchase Plans Avalon Red Rocks Avalon Red Rocks [Member] Avalon Red Rocks [Member] Weighted average capped interest rate (as a percent) Derivative, Average Cap Interest Rate Continuing Operations Continuing Operations [Member] Interest Rate Caps Interest Rate Cap [Member] eaves Redmond Campus eaves Redmond Campus [Member] Represents the information pertaining to Eaves Redmond Campus, located at Redmond, WA. Adjustment to Compensation, Amount Adjustment to Compensation Amount Concentration risk, percentage Concentration Risk, Percentage Less deferred financing costs and debt discount Deferred financing costs and debt discount associated with unsecured and secured notes Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] Principles of Consolidation Consolidation, Policy [Policy Text Block] Amortization of stock-based compensation Share-Based Payment Arrangement, Noncash Expense Employee Stock Option Share-Based Payment Arrangement, Option [Member] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Cash, Cash Equivalents and Restricted Cash Cash and Cash Equivalents, Policy [Policy Text Block] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total stockholders' equity Equity, Attributable to Parent Insider Trading Policies and Procedures [Line Items] Avalon South Miami Avalon South Miami [Member] Avalon South Miami Common stock, shares authorized (in shares) Common Stock, Shares Authorized Notes Payable 5.0000 Maturities 2035 Notes Payable 5.0000 Maturities 2035 [Member] Notes Payable 5.0000 Maturities 2035 Additional SIP commitments Other Commitments, Number of New SIP Commitments Other Commitments, Number of New SIP Commitments Issuance of common stock, net of withholdings (in shares) Stock Issued During Period, Shares, New Issues Northeast and California Regions Northeast and California Regions [Member] Northeast and California Regions Avalon Townhome Collection Roseland Avalon Roseland [Member] Avalon Roseland [Member] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Avalon at Mission Bay III Avalon at Mission Bay III [Member] Represents the information pertaining to Avalon at Mission Bay III, located at San Francisco, CA. Cover [Abstract] Cover [Abstract] Restricted stock converted from performance shares Restricted Stock Converted From Performance Shares [Member] Restricted Stock Converted From Performance Shares [Member] eaves Twin Creeks eaves Twin Creeks [Member] eaves Twin Creeks Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Real Estate Disposition Activities Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Maximum Maximum [Member] Options exercisable at the end of the period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Real estate: Real Estate Investment Property, Net [Abstract] Net (income) loss attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Avalon Riverview Avalon Riverview [Member] Represents the information pertaining to Avalon Riverview, located at Long Island City, NY. Interest Capitalized Interest Capitalized Restricted stock Restricted Stock [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, by Property [Table] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, by Property [Table] Mortgage Notes Payable, Unsecured Notes and Credit Facility Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Costs Subsequent to Acquisition / Construction SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition, Cost Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] AVA DoBro AVA DoBro [Member] AVA DoBro located in Brooklyn, NY [Member] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Metro NY/NJ Metro NYNJ [Member] Represents information pertaining to Metro New York and New Jersey. Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Proceeds from issuance of debt Proceeds from Issuance of Debt Changes in accumulated depreciation SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Capitalized stock-based compensation cost Share-Based Payment Arrangement, Amount Capitalized Operating segment Operating Segments [Member] (Loss) gain on cash flow hedges Gain on cash flow hedges, net Increase to prepaid expenses and other assets Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Avalon at Lexington Avalon at Lexington [Member] Represents the information pertaining to Avalon at Lexington, located at Lexington, MA. Derivative, notional amounts settled during the period Derivative, Notional Amounts Settled During Period Derivative, Notional Amounts Settled During Period Avalon Walnut Creek Avalon Walnut Creek [Member] Represents the information pertaining to Avalon Walnut Creek, located at Walnut Creek, CA. Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Line of Credit Facility [Table] Line of Credit Facility [Table] Avalon Calabasas Avalon Calabasas [Member] Represents the information pertaining to Avalon Calabasas, located at Calabasas, CA. Financial metrics (in shares) Share-based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period Based On Financial Metrics Share-based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period Based On Financial Metrics Exercise Price Range [Axis] Exercise Price Range [Axis] TEXAS TEXAS Secured Debt, Commercial Paper Program and Variable Rate Unsecured Indebtedness Secured Debt, Commercial Paper Program and Variable Rate Unsecured Indebtedness [Member] Secured Debt, Commercial Paper Program and Variable Rate Unsecured Indebtedness Exercise Price Range from 236.00 to 245.99 Exercise Price Range from 236.00 to 245.99 [Member] Exercise Price Range from 236.00 to 245.99 AVA Studio City II AVA Studio City II [Member] Represents the information pertaining to AVA Studio City II, located at Los Angeles, CA. Document Fiscal Period Focus Document Fiscal Period Focus Segment Operating Expenses Segment Operating Expenses [Axis] Segment Operating Expenses Property taxes Property Taxes Real Estate Tax Expense Avalon Wayne Avalon Wayne [Member] Avalon Wayne Avalon Somers Avalon Somers [Member] Avalon Somers [Member] Restricted Stock and Common Stock Converted from Performance Shares Restricted Stock and Common Stock Converted from Performance Shares [Member] Restricted Stock and Common Stock Converted from Performance Shares Award Timing Method Award Timing Method [Text Block] Furniture, fixtures and equipment Furniture and Fixtures [Member] Avalon Redmond Campus Avalon Redmond Campus [Member] Avalon Redmond Campus Gain (loss) reclassification from accumulated OCI to income, estimated net amount to be transferred Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred Award Type [Axis] Award Type [Axis] Avalon Willow Glen Avalon Willow Glen [Member] Represents the information pertaining to Avalon Willow Glen, located at San Jose, CA. Hedging Relationship [Domain] Hedging Relationship [Domain] Avalon Alderwood I Avalon Alderwood I [Member] Represents the information pertaining to Avalon Alderwood I, located at Lynnwood, WA. Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four eaves Fremont eaves Fremont [Member] Represents the information pertaining to Eaves Fremont, located at Fremont, CA. Percentage of stock based compensation elected to be received in the form of stock options upon the election of the recipient Share Based Compensation Arrangement by Share Based Payment Award Percentage of Stock Options Share Based Compensation Represents the percentage of stock based compensation to be received in the form of stock options upon the election of the recipient. Entity Address, City or Town Entity Address, City or Town Avalon Reston Landing Avalon Reston Landing [Member] Represents the information pertaining to Avalon Reston Landing, located at Reston, VA. Weighted-average discount rate - finance leases Finance Lease, Weighted Average Discount Rate, Percent Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Dispositions, including casualty losses, and other activity SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Investment in Real Estate Sold Avalon Exeter Avalon Exeter [Member] Represents the information pertaining to Avalon Exeter, located at Boston, MA. Variable rate mortgage notes payable Variable Rate Mortgage Notes Payable [Member] Represents information pertaining to variable rate mortgage notes payable. Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Kanso Milford Kanso Milford [Member] Kanso Milford Debt instrument, basis spread on variable rate, increase (decrease) Debt Instrument, Basis Spread On Variable Rate, Increase (Decrease) Debt Instrument, Basis Spread On Variable Rate, Increase (Decrease) eaves Dublin eaves Dublin [Member] Represents the information pertaining to Eaves Dublin, located at Dublin, CA. Entity Emerging Growth Company Entity Emerging Growth Company Weighted-average remaining lease term - finance leases Finance Lease, Weighted Average Remaining Lease Term Options outstanding at the beginning of the period (in shares) Options outstanding at the end of the period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Restricted cash Restricted Cash and Cash Equivalent eaves Woodland Hills eaves Woodland Hills [Member] Represents the information pertaining to Eaves Woodland Hills, located at Woodland Hills, CA. Less discount for time value Finance Lease, Liability, Undiscounted Excess Amount Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Share-based Payment Arrangement, Option, Exercise Price Range [Table] Share-Based Payment Arrangement, Option, Exercise Price Range [Table] Other real estate activity Other real estate activity Gain (Loss) on Disposition of Other Assets Uncollectible lease revenue Accounts Receivable, Credit Loss Expense (Reversal) Avalon Brea Place Avalon Brea Place [Member] Avalon Brea Place [Member] Summary of Weighted Average Remaining Lease Term and Discount Rates Lease, Weighted-Average Remaining Lease Term and Discount Rate [Table Text Block] Lease, Weighted-Average Remaining Lease Term and Discount Rate [Table Text Block] Change in awards based on performance (in dollars per share) Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Change in Awards Based on Performance, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Change in Awards Based on Performance, Weighted Average Grant Date Fair Value Avalon Alderwood II Avalon Alderwood II [Member] Avalon Alderwood II [Member] Derivatives entered into during period Derivative, Notional Amounts Entered Into During Period Derivative, Notional Amounts Entered Into During Period Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Avalon Willoughby Square Avalon Willoughby Square [Member] Represents the information pertaining to Avalon Willoughby Square, located at Brooklyn, NY. Avalon The Albemarle Avalon The Albemarle [Member] Represents information pertaining to Avalon The Albemarle, located at Washington, DC. Avalon Perimeter Park Avalon Perimeter Park [Member] Avalon Perimeter Park Building / Construction in Progress & Improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Building and Improvements Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Long-term construction loan guarantee, payment reimbursement by partner, percentage Long-Term Construction Loan Guarantee, Payment Reimbursement By Partner, Percentage Long-Term Construction Loan Guarantee, Payment Reimbursement By Partner, Percentage Performance awards Restricted stock shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Pledged Status [Domain] Pledged Status [Domain] Debt instrument, effective interest rate (as a percent) Debt Instrument, Interest Rate, Effective Percentage Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income tax benefit (expense) Income tax benefit (expense) Income Tax Expense (Benefit) Number of apartment communities sold Number Of Apartment Communities Sold Number of Operating Apartment Communities Sold Debt instrument, basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Avalon San Bruno II Avalon San Bruno II [Member] Represents the information pertaining to Avalon San Bruno II, located at San Bruno, CA. Reclassification, cash flow hedge losses Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Reconciliation of NOI to net income Reconciliation of Net Operating Income to Net Income [Abstract] Avalon Belltown Towers Avalon Belltown Towers [Member] Avalon Belltown Towers [Member] Employee Stock Purchase Plan [Abstract] Employee Stock Purchase Plan [Abstract] Interest Rate Swap, Entered Into 2025 Interest Rate Swap, Entered Into 2025 [Member] Interest Rate Swap, Entered Into 2025 AVA Brewer's Hill AVA Brewers Hill [Member] AVA Brewers Hill Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Unsecured debt, net Unsecured Debt Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Avalon Natick Avalon Natick [Member] Represents the information pertaining to Avalon Natick, located at Natick, MA. 2009 Plan Stock Option and Incentive Plan 2009 [Member] Represents information pertaining to the entity's 2009 Stock Option and Incentive Plan. Avalon Governor's Park Avalon Governor's Park [Member] Avalon Governor's Park Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] AVA Balboa Park AVA Balboa Park [Member] AVA Balboa Park Hedging Relationship [Axis] Hedging Relationship [Axis] Avalon Thousand Oaks Plaza Avalon Thousand Oaks Plaza [Member] Represents the information pertaining to Avalon Thousand Oaks Plaza, located at Thousand Oaks, CA. Mid Atlantic Mid Atlantic [Member] Represents information pertaining to Mid-Atlantic. Avalon Coconut Creek Avalon Coconut Creek [Member] Avalon Coconut Creek Dividends payable, common stock and DownREIT unit Dividends Payable, Common Stock and DownREIT Unit Dividends Payable, Common Stock and DownREIT Unit Avalon Annapolis Avalon Annapolis [Member] Avalon Annapolis Notes Payable 3.900 Maturities 2046 Notes Payable 3.900 Maturities 2046 [Member] Notes Payable 3.900 Maturities 2046 Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Notes Payable, Other Payables Notes Payable, Other Payables [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Payroll Cost, Direct Labor Buildings and related improvements Building and Building Improvements [Member] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Percentage of principle amount at which the entity may redeem some or all of the notes Debt Instrument, Redemption Price, Percentage Deferred Compensation, Share-based Payments Restricted stock and deferred stock awards Deferred Compensation, Share-Based Payments [Member] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract] Outstanding at the beginning of the period (in shares) Outstanding at the ending of the period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] eaves Burlington eaves Burlington [Member] Represents information pertaining to Eaves Burlington. Proceeds from construction loans payable Proceeds from Construction Loans Payable Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Denver, CO Denver, CO [Member] Denver, CO Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Estimated useful life of assets (in years) Property, Plant and Equipment, Useful Life Preferred stock, par value per share (in dollars per share) Preferred Stock, Par or Stated Value Per Share Subsequent Event Subsequent Event [Member] Summary of valuation options Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Avalon Public Market Avalon Public Market [Member] Avalon Public Market [Member] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation expense Depreciation Avalon Cherry Hills Avalon Cherry Hills [Member] Avalon Cherry Hills 2029 Finance Lease, Liability, to be Paid, Year Four Maximum measurement period (in years) Share Based Compensation Arrangement By Share Based Payment Award Maximum Measurement Period Share Based Compensation Arrangement By Share Based Payment Award Maximum Measurement Period Notes Payable Maturities 2032 Notes Payable Maturities 2032 [Member] Notes Payable Maturities 2032 Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Avalon Courthouse Place Avalon Courthouse Place [Member] Represents the information pertaining to Avalon Courthouse Place, located at Arlington, VA. Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] eaves Pleasanton eaves Pleasanton [Member] Represents the information pertaining to Eaves Pleasanton, located at Pleasanton, CA. Avalon Harrison Avalon Harrison [Member] Avalon Harrison [Member] Avalon Esterra Park Avalon Esterra Park [Member] Avalon Esterra Park [Member] Avalon Foundry Row Avalon Foundry Row [Member] Avalon Foundry Row [Member] Expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Dividends paid Payments of Ordinary Dividends Avalon at Foxhall Avalon at Foxhall [Member] Represents the information pertaining to Avalon at Foxhall, located at Washington, DC. Avalon Tech Ridge I Avalon Tech Ridge I [Member] Avalon Tech Ridge I Avalon Lakeside Avalon Lakeside [Member] Avalon Lakeside Avalon Easton II Avalon Easton II [Member] Avalon Easton II Stock Options Employee and Directors Stock Options [Member] An arrangement whereby an employee or member of the Board of Directors is entitled to receive in the future, subject to vesting and other restrictions, a number of shares in the entity at a specified price, as defined in the agreement. Entity Address, State or Province Entity Address, State or Province Southern California Southern California [Member] Represents information pertaining to Southern California. Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Dividends declared to common stockholders Dividends, Common Stock AVA H Street AVA H Street [Member] Represents the information pertaining to AVA H Street, located at Washington, DC. Employment period of full-time employees for becoming eligible to participate in the plan (in months) Share Based Compensation Arrangement by Share Based Payment Award, Award Requisite Service Period Full Time Employees Estimated period over which a full-time employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Individual: Individual [Axis] Avalon Garden City Avalon Garden City [Member] Represents the information pertaining to Avalon Garden City, located at Garden City, NY. Number of communities held for sale Number Of Communities Held For Sale Number of Communities Held for Sale Document Annual Report Document Annual Report eaves La Mesa eaves La Mesa [Member] Represents the information pertaining to Eaves La Mesa, located at La Mesa, CA. Notes Payable Maturities 2031 Notes Payable Maturities 2031 [Member] Notes Payable Maturities 2031 AVA Queen Anne AVA Queen Anne [Member] Represents the information pertaining to AVA Queen Anne, located at Seattle, WA. Number of members who hold various interests in joint venture Number of Members who Hold Various Interests in Joint Venture Represents the number of members who hold various interests in the joint venture. Notes Payable 3.350 Maturities 2027 Notes Payable 3.350 Maturities 2027 [Member] Notes Payable 3.350 Maturities 2027 Avalon Lowry Avalon Lowry [Member] Avalon Lowry Avalon West Hollywood Avalon West Hollywood [Member] Avalon West Hollywood [Member] eaves Mountain View at Middlefield eaves Mountain View at Middlefield [Member] Represents the information pertaining to Eaves Mountain View at Middlefield, located at Mountain View, CA. Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Entity Interactive Data Current Entity Interactive Data Current Conversion of performance awards to restricted shares of common stock (in shares) Converted to shares of common stock (in shares) Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Converted to Common Shares Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Converted to Common Shares Director Compensation, Restricted stock, value Director Compensation, Restricted Stock, Value [Member] Director Compensation, Restricted Stock, Value Catastrophic Event [Domain] Catastrophic Event [Domain] New York - Suburban New York - Suburban [Member] New York - Suburban [Member] Weighted Average Remaining Contractual Term Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term eaves Tysons Corner eaves Tysons Corner [Member] Represents the information pertaining to Eaves Tysons Corner, located at Vienna, VA. Forward contract indexed to issuer's equity, net proceeds Forward Contract Indexed To Issuer's Equity, Net Proceeds Forward Contract Indexed To Issuer's Equity, Net Proceeds Revenue and Gain Recognition Revenue from Contract with Customer [Policy Text Block] AVA Esterra Park AVA Esterra Park [Member] AVA Esterra Park located in Redmond, WA [Member] Exercise Price Range from 221.00 to 230.99 Exercise Price Range from 221.00 to 230.99 [Member] Exercise Price Range from 221.00 to 230.99 Avalon White Plains Avalon White Plains [Member] Represents the information pertaining to Avalon White Plains, located at White Plains, NY. Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Avalon Dogpatch Avalon Dogpatch [Member] Avalon Dogpatch [Member] Non-employee director serving as a chairperson of the Compensation Committee Non Employee Director Serving As A Chairperson of the Compensation Committee [Member] Non Employee Director Serving As A Chairperson of the Compensation Committee [Member] Historical volatility (as a percent) Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Weighted Average Historical Volatility Rate The historical volatility rate used in valuation technique of calculation of fair value of awards. Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Land and Improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Land Net income Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest 2027 Finance Lease, Liability, to be Paid, Year Two MVPI LLC MVPI LLC [Member] Represents information pertaining to MVP I, LLC. Commercial paper Commercial paper outstanding Commercial Paper AVA Pasadena AVA Pasadena [Member] Represents information pertaining to AVA Pasadena. Average sales price of common stock (in shares) Shares Issued, Weighted Average Price Per Share Shares Issued, Weighted Average Price Per Share AVA Burbank AVA Burbank [Member] Represents the information pertaining to AVA Burbank, located at Burbank, CA. Entity Central Index Key Entity Central Index Key PEO Name PEO Name Scheduled payments and maturities of mortgage notes payable and unsecured notes outstanding Schedule of Maturities of Long-Term Debt [Table Text Block] Total revenue Total revenue Revenues Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Property and construction management roles Unconsolidated Real Estate Entities [Member] Represents information pertaining to real estate entities that are not consolidated within the entity's financial statements. Avalon Cove Avalon Cove [Member] Represents the information pertaining to Avalon Cove, located at Jersey City, NJ. Number of communities acquired Number Of Communities Acquired Number of Communities Acquired Avalon Parker Avalon Parker [Member] Avalon Parker Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Notes Payable Maturities 2028 Notes Payable Maturities 2028 [Member] Notes Payable Maturities 2028 [Member] Avalon Bloomingdale Avalon Bloomingdale [Member] Represents the information pertaining to Avalon Bloomingdale, located at Passaic, NJ. Avalon Melville Avalon Melville [Member] Represents the information pertaining to Avalon Court, located at Melville, NY. Avalon Frisco at Main Avalon Frisco at Main [Member] Avalon Frisco at Main (Increase) decrease in prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Notes Payable Maturities 2029 Notes Payable Maturities 2029 [Member] Notes Payable Maturities 2029 [Member] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Unrecognized compensation cost for unvested stock options Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Number of limited partnership units issued Number Of Limited Partnership Units Issued Number Of Limited Partnership Units Issued Subsequent Event Type [Axis] Subsequent Event Type [Axis] Unconsolidated real estate entities Equity Method Investment, Number Of Unconsolidated Real Estate Entities Represents the number of unconsolidated real estate entities in which the entity had investments as of the balance sheet date. Avalon at Arlington Square Avalon at Arlington Square [Member] Represents the information pertaining to Avalon at Arlington Square, located at Arlington, VA. Change in awards based on performance (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Increase (Decrease) In Awards Based On Performance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Increase (Decrease) in Awards Based on Performance AVA Back Bay AVA Back Bay [Member] Represents information pertaining to AVA Back Bay, located at Boston, MA. AVA Toluca Hills AVA Toluca Hills [Member] Represents information pertaining to AVA Toluca Hills, located at Los Angeles, CA. Anniversary of Completion of Development or Redevelopment (in years) Anniversary of Completion of Development or Redevelopment Represents the anniversary of completion of development or redevelopment to consider a community as stabilized occupancy. Increase (decrease) in payables for construction Proceeds from (Payments to) Construction Payables Proceeds from (Payments to) Construction Payables Ordinary income (as a percent) Common Stock Dividends Ordinary Taxable Distribution Percentage Represents the percentage of aggregate dividends paid during the period treated as ordinary taxable distribution for federal tax purposes. Payables for construction Construction Payable Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Number of states where operating apartment communities owned are located Number of States in which Entity Operates Entity Address, Address Line One Entity Address, Address Line One Summary of exercise prices and contractual lives of options outstanding Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block] Accumulated other comprehensive (loss) income AOCI Attributable to Parent [Member] Avalon Norwood Avalon Norwood [Member] Avalon Norwood [Member] Kanso Twinbrook Kanso Twinbrook [Member] Kanso Twinbrook [Member] Deferred Financing Costs Deferred Charges, Policy [Policy Text Block] Number of shares withheld to satisfy employees' tax withholding and other liabilities (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Office Operations Segment Reporting, Office Operations Segment Reporting, Office Operations Notes Payable 2.050 Maturities 2032 Notes Payable 2.050 Maturities 2032 [Member] Notes Payable 2.050 Maturities 2032 Acquisitions, construction costs and improvements Real Estate Acquisitions Construction Costs and Improvements Amount of real estate investments acquired, construction costs and improvements made to real estate investments during the period. Avalon Glendora Avalon Glendora [Member] Represents the information pertaining to Avalon Glendora, located at Glendora, CA. Other real estate Other Real Estate Sales [Member] Other Real Estate Sales [Member] Exercise Price, lower limit (in dollars per share) Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit Summary of income from discontinued operations Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Name of Property [Domain] Name of Property [Domain] Fair Value as of Grant Date Award Grant Date Fair Value Avalon San Bruno III Avalon San Bruno III [Member] Represents the information pertaining to Avalon San Bruno III, located at San Bruno, CA. Avalon Sudbury Avalon Sudbury [Member] Avalon Sudbury located in Sudbury, MA [Member] Net income attributable to common stockholders—basic Undistributed Earnings, Basic Minimum distribution of REIT taxable income for federal income tax exemption (as a percent) Minimum Percentage of Distribution of REIT Taxable Income for Federal Income Tax Exemption Represents the minimum percentage of taxable income of the real estate investment trust that is to be distributed by the entity to its shareholders over the time period allowed under the Code, so as to be eligible for exemption from corporate level federal income taxation. eaves Mission Ridge eaves Mission Ridge [Member] Represents the information pertaining to Eaves Mission Ridge, located at San Diego, CA. Summary of company's mortgage notes payable, unsecured notes, term loan and credit facility Schedule of Long-Term Debt Instruments [Table Text Block] Granted (in shares) Common stock shares issued in connection with stock grants (in shares) Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Total expenses Total Expenses Costs and Expenses Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Related Party Arrangements Related Party Transaction [Line Items] Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities Avalon Towson Avalon Towson [Member] Avalon Towson located in Towson, MD [Member] Indebtedness Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Development rights, no longer probable Number Of Development Rights, No Longer Probable Number Of Development Rights, No Longer Probable Casualty and impairment loss Casualty Gain And Impairment Loss, Net, Operating Activities The charge against earnings in the period to reduce the carrying amount of real property to fair value from casualty losses and impairment charges, offset by the cash inflow from insurance recoveries relating to insurance settlements classified as operating cash flows. Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Avalon Hunt Valley Avalon Hunt Valley [Member] Avalon Hunt Valley [Member] AVA Nob Hill AVA Nob Hill [Member] AVA Nob Hill [Member] eaves Washingtonian Center eaves Washingtonian Center [Member] Represents the information pertaining to Eaves Washingtonian Center, located at Gaithersburg, MD. Non-Apartment Components Of Mixed-Use Communities And Other Nonresidential Operations Non-Apartment Components Of Mixed-Use Communities And Other Nonresidential Operations [Member] Non-Apartment Components Of Mixed-Use Communities And Other Nonresidential Operations eaves Wilmington eaves Wilmington [Member] eaves Wilmington Commitments and Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Line Items] Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Notes Payable Maturities 2027 Notes Payable Maturities 2027 [Member] Notes Payable Maturities 2027 [Member] Number of apartment homes included in operating apartment communities owned Number of units in real estate property Number of Units in Real Estate Property AVA Arts District AVA Arts District [Member] AVA Arts District The Park Loggia Commercial The Park Loggia [Member] The Park Loggia [Member] Prepaid expenses and other assets Prepaid Expense and Other Assets Avalon Rockville Centre I Avalon Rockville Centre I [Member] Represents the information pertaining to Avalon Rockville Centre I, located at Rockville Centre, NY. Non-PEO NEO Non-PEO NEO [Member] Letters of credit outstanding Letters of Credit Outstanding, Amount Interest income, other Interest Income, Other Avalon Union Avalon Union [Member] Avalon Union [Member] Sale of Stock [Axis] Sale of Stock [Axis] Maximum value of shares of common stock that can be sold Common Stock Value, Authorized Under Continuous Equity Program The maximum value of common stock which the entity is authorized to issue under the program. Land Land [Member] Avalon Easton Avalon Easton [Member] Avalon Easton [Member] Award Type [Domain] Award Type [Domain] Orange County, CA Orange County, CA [Member] Orange County, CA [Member] 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Kanso Hillcrest Kanso Hillcrest [Member] Kanso Hillcrest Avalon Dublin Station Avalon Dublin Station [Member] Represents the information pertaining to Avalon Dublin Station, located at Dublin, CA. Noncontrolling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Commercial square feet Commercial Square Feet Commercial Square Feet Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Avalon Quincy Adams Avalon Quincy Adams [Member] Avalon Quincy Adams Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Dividend yield (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Investments Real Estate Disclosure [Text Block] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Total Fair Value Estimate of Fair Value Measurement [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Preferred interest obligation redemption and dividends Payment For Redemption Of Preferred Interest Obligation Represents the cash outflow for redemption of preferred interest obligation. Notes Payable 4.1500 Maturities 2047 Notes Payable 4.1500 Maturities 2047 [Member] Notes Payable 4.1500 Maturities 2047 2020 Stock Repurchase Program and 2025 Stock Repurchase Program 2020 Stock Repurchase Program and 2025 Stock Repurchase Program [Member] 2020 Stock Repurchase Program and 2025 Stock Repurchase Program Avalon at Pier 121 Avalon at Pier 121 [Member] Avalon at Pier 121 Basic and diluted shares outstanding Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Avalon Walnut Creek II Avalon Walnut Creek II [Member] Avalon Walnut Creek II located in Walnut Creek, CA [Member] Revenue: Revenues [Abstract] Fixed Rate Unsecured Notes Fixed Rate Unsecured Notes [Member] Fixed Rate Unsecured Notes Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] eaves Union City eaves Union City [Member] Represents the information pertaining to Eaves Union City, located at Union City, CA. Encumbrances SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Amount of Encumbrances Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] eaves Old Town Pasadena eaves Old Town Pasadena [Member] Represents the information pertaining to Eaves Old Town Pasadena, located at Pasadena, CA. Avalon Clinton South Avalon Clinton South [Member] Represents the information pertaining to Avalon Clinton South, located at New York, NY. Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax New England New England [Member] Represents information pertaining to New England. Weighted average interest rate (as a percent) Derivative Weighted Average Interest Rate Reflects the calculation as of the balance sheet date of the average interest rate weighted by interest rate caps and interest rate swaps at that time. Avalon Studio City Avalon Studio City [Member] Represents the information pertaining to Avalon Studio City, located at Los Angeles, CA. Avalon Tysons Corner Avalon Tysons Corner [Member] Represents the information pertaining to Avalon Tysons Corner, located at McLean, VA. Notes Payable 3.450 Maturities 2025 Notes Payable 3.450 Maturities 2025 [Member] Notes Payable 3.450 Maturities 2025 [Member] Tax components of common stock dividends declared Tax Components of Common Stock Dividends Declared [Abstract] Avalon at Becker Farm Avalon at Becker Farm [Member] Avalon at Becker Farm Performance awards Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Net operating real estate Operating Real Estate Investment Property, Net Operating Real Estate Investment Property, Net Cash flow hedge (gains) losses reclassified to earnings Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, after tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Total Revenue Revenue Excluding Management, Development And Other Fees And Other Ancillary Items Revenue, Excluding Revenue From Contract With Customer Avalon at Palisades Avalon at Palisades [Member] Avalon at Palisades Pledging Purpose [Domain] Pledging Purpose [Domain] Minimum Minimum [Member] Avalon Maplewood Avalon Maplewood [Member] Avalon Maplewood [Member] California and Metro NY/NJ regions California and Metro NY/NJ regions [Member] California and Metro NY/NJ regions Repayments of mortgage notes payable, including prepayment penalties Repayments of Notes Payable Company Selected Measure Name Company Selected Measure Name Fair Value Measurement [Domain] Fair Value Measurement [Domain] eaves San Dimas Canyon eaves San Dimas Canyon [Member] Represents the information pertaining to Eaves San Dimas Canyon, located at San Dimas, CA. Debt Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Notes Payable 4.3500 Maturities 2048 Notes Payable 4.3500 Maturities 2048 [Member] Notes Payable 4.3500 Maturities 2048 Shares cancelled upon forfeiture Shares Issued, Value, Share-Based Payment Arrangement, Forfeited eaves Fairfax Towers eaves Fairfax Towers [Member] Represents the information pertaining to Eaves Fairfax Towers, located at Falls Church, VA. Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Dividends payable Dividends Payable Net income—diluted Net Income (Loss) Available to Common Stockholders, Diluted Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] 2025 Disposals 2025 Disposals [Member] 2025 Disposals Kanso Silver Spring Kanso Silver Spring [Member] Kanso Silver Spring Estimated volatility, minimum (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] 2023 Acquisition 2023 Acquisition [Member] 2023 Acquisition Weighted average common shares - diluted (in shares) Weighted average common shares - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Avalon North Bergen Avalon North Bergen [Member] Represents the information pertaining to Avalon North Bergen, located at North Bergen, NJ. eaves Wilmington West eaves Wilmington West [Member] eaves Wilmington West Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] Entity Small Business Entity Small Business Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Assets Held under Finance Leases Assets Held under Finance Leases [Member] Assets Held under Finance Leases [Member] Document Transition Report Document Transition Report Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Noncontrolling Interest, Dividends, Per Share, Declared Noncontrolling Interest, Dividends, Per Share, Declared Noncontrolling Interest, Dividends, Per Share, Declared Notes Payable 2.950 Maturities 2026 Notes Payable 2.950 Maturities 2026 [Member] Notes Payable 2.950 Maturities 2026 [Member] Long-Term Debt Long-Term Debt [Member] 2026 Stock Repurchase Program 2026 Stock Repurchase Program [Member] 2026 Stock Repurchase Program Total Finance Lease, Liability, to be Paid Underlying Securities Award Underlying Securities Amount Avalon Fremont Avalon Fremont [Member] Represents the information pertaining to Avalon Fremont, located at Fremont, CA. Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Avalon Santa Monica on Main Avalon Santa Monica on Main [Member] Represents the information pertaining to Avalon Santa Monica on Main, located at Santa Monica, CA. Furniture, fixtures and equipment Fixtures and Equipment, Gross Avalon Meydenbauer Avalon Meydenbauer [Member] Represents the information pertaining to Avalon Meydenbauer, located at Bellevue, WA. Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] eaves Huntington Beach eaves Huntington Beach [Member] Represents the information pertaining to Eaves Huntington Beach, located at Huntington Beach, CA. Options exercisable weighted average contractual life (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Segment Reporting, Insurance Segment Reporting, Insurance Segment Reporting, Insurance Total equity Beginning Balance Ending Balance Equity, Including Portion Attributable to Noncontrolling Interest Avalon Bellevue Avalon Bellevue [Member] Represents the information pertaining to Avalon Bellevue, located at Bellevue, WA. Shares acquired, average price (in dollars per share) Shares Acquired, Average Cost Per Share Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items] Document Type Document Type Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Name Outstanding Recovery, Individual Name Avalon Hoboken Avalon Hoboken [Member] Avalon Hoboken [Member] Additional paid-in capital Additional Paid in Capital Product and Service [Axis] Product and Service [Axis] Fair value of shares issued Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Issued In Period Fair Value Represents the fair value of share-based awards other than options issued during the period. Debt instrument, increase (decrease), other, net Debt Instrument, Increase (Decrease), Other, Net Total mortgage notes payable, unsecured debt Mortgage notes payable and unsecured notes Notes Payable Management, development and other fees Revenue from Contract with Customer, Excluding Assessed Tax Avalon Mosaic Avalon Mosaic [Member] Represents the information pertaining to Avalon Mosaic, located at Merrifield, VA. Avalon North Andover Avalon North Andover [Member] Avalon North Andover Statistical Measurement [Axis] Statistical Measurement [Axis] Receipt for termination of forward interest rate swaps Payment for termination of forward interest rate swaps Payments for (Proceeds from) Hedge, Financing Activities Authorized amount of stock repurchase program Share Repurchase Program, Authorized, Amount Avalon 850 Boca Avalon 850 Boca [Member] 850 Boca located in Boca Raton, FL [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Intrinsic value of options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Payments related to tax withholding for share-based compensation Payment, Tax Withholding, Share-Based Payment Arrangement Noncontrolling interests, joint venture and preferred equity transactions Payments For Redemption Of Noncontrolling Interests, Distribution To Joint Ventures And Preferred Equity Redemption And Dividends Payments For Redemption Of Noncontrolling Interests, Distribution To Joint Ventures And Preferred Equity Redemption And Dividends Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net income attributable to common stockholders Net income attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Equity method investments and equity securities Equity Method Investments and Equity Securities Equity Method Investments and Equity Securities Share Repurchase Program [Domain] Share Repurchase Program [Domain] Schedule of reconciliation of NOI to net income Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Gain (Loss) on disposition Proceeds from Sale of Real Estate Operating Expenses Operating Expenses Risk-free interest rate, minimum (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] 2025 Stock Repurchase Program 2025 Stock Repurchase Program [Member] 2025 Stock Repurchase Program Credit Facility Long-Term Line of Credit Beginning Balance (in shares) Ending Balance (in shares) Shares, Outstanding Increase in accrued expenses, other liabilities, accrued interest payable and resident security deposits Increase (Decrease) in Accrued Liabilities Related Party Transaction [Table] Related Party Transaction [Table] Net income per common share - diluted (in dollars per share) Earnings per common share - diluted (in dollars per share) Earnings Per Share, Diluted Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Number of owned communities under construction Number of Owned Communities under Construction Number of owned communities (or where a direct or indirect interest is owned) that are under construction. Supplemental disclosures of non-cash investing and financing activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Variable Rate Unsecured Term Loan $550 Million Variable Rate Unsecured Term Loan $550 Million [Member] Variable Rate Unsecured Term Loan $550 Million Forward contract indexed to issuer's equity, forward rate per share (in dollars per share) Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share Avalon Sunset Towers Avalon Sunset Towers [Member] Represents the information pertaining to Avalon Sunset Towers, located at San Francisco, CA. Avalon Amityville Avalon Amityville [Member] Avalon Amityville Avalon Burlington Avalon Burlington [Member] Represents the information pertaining to Avalon Burlington, located at Burlington, MA. Avalon Irvine I Avalon Irvine I [Member] Represents the information pertaining to Avalon Irvine I, located at Irvine, CA. Common stock issued through the dividend reinvestment plan Stock Issued During Period, Value, Dividend Reinvestment Plan Real Estate and Accumulated Depreciation SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] Consolidation Items [Domain] Consolidation Items [Domain] Line of credit facility, commitment fee percentage, increase (decrease) Line of Credit Facility, Commitment Fee Percentage, Increase (Decrease) Line of Credit Facility, Commitment Fee Percentage, Increase (Decrease) Assets Held under Operating Leases Assets Held under Operating Leases [Member] Assets Held under Operating Leases [Member] Auditor Location Auditor Location Asset Acquisition [Table] Asset Acquisition [Table] Repurchase of common stock, including repurchase costs Stock Repurchased and Retired During Period, Value Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Wholly owned properties Wholly Owned Properties [Member] Less discount for time value Lessee, Operating Lease, Liability, Undiscounted Excess Amount Distributions from unconsolidated entities and investment sale proceeds Proceeds from Sale of Equity Securities, FV-NI Accrued expenses and other liabilities Accrued Liabilities Notes Payable 1.900 Maturities 2028 Notes Payable 1.900 Maturities 2028 [Member] Notes Payable 1.900 Maturities 2028 Real estate assets held for sale, net Disposal Group, Including Discontinued Operation, Assets, Current Total principal outstanding Long-Term Debt, Gross eaves Lake Forest eaves Lake Forest [Member] Represents the information pertaining to Eaves Lake Forest, located at Lake Forest, CA. Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Lessee, Operating Lease, Liability, to be Paid Total Lessee, Operating Lease, Liability, to be Paid Dividends declared to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Avalon West Plano Avalon West Plano [Member] Avalon West Plano Same Store Same Store [Member] Represents information pertaining to the Same Store segment of the entity. Expiration Date Trading Arrangement Expiration Date Other Commitments [Domain] Other Commitments [Domain] Accumulated Depreciation Balance, beginning of period Balance, end of period SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation Avalon Wesmont Station I & II Avalon Wesmont Station I & II [Member] Avalon Wesmont Station I & II Related party transactions Related Party Transaction, Amounts of Transaction Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Land Held for Development Land Held for Development [Member] Represents information pertaining to land held for development of the entity. Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status Net operating income from real estate assets sold or held for sale Net operating income from real estate assets sold or held for sale Disposal Group, Not Discontinued Operation, Net Operating Income From Assets Held For Sale, Not Classified As Discontinued Operations Disposal Group, Not Discontinued Operation, Net Operating Income From Assets Held For Sale, Not Classified As Discontinued Operations Derivative instruments and Hedging Activities Derivative [Line Items] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Avalon at Gallery Place Avalon at Gallery Place [Member] Represents the information pertaining to Avalon at Gallery Place, located at Washington, DC. eaves Quincy eaves Quincy [Member] Represents the information pertaining to Eaves Quincy, located at Quincy, MA. Avalon South End Avalon South End [Member] Avalon South End Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Los Angeles, CA Los Angeles, CA [Member] Los Angeles, CA [Member] Avalon Princeton Circle Avalon Princeton Circle [Member] Avalon Princeton Circle Avalon Arundel Crossing Avalon Arundel Crossing [Member] Avalon Arundel Crossing [Member] Interest expense, net Interest Expense, Operating and Nonoperating Current Fiscal Year End Date Current Fiscal Year End Date Avalon W Squared at Princeton Junction Avalon W Squared at Princeton Junction [Member] Avalon W Squared at Princeton Junction Expected life of options Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Other Stabilized Other Stabilized Communities [Member] Represents information pertaining to the Other Stabilized Communities segment of the entity. eaves San Marcos eaves San Marcos [Member] Represents the information pertaining to Eaves San Marcos, located at San Marcos, CA. Weighted average grant date fair value per award Weighted average grant date fair value per share Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Common stock shares available for grant Employee stock purchase plan, remaining shares of common stock available for issuance Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Derivative Liability Derivative Liability Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Estimated fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Loan potential term extension period Loan Potential Term Extension Period Loan Potential Term Extension Period Schedule of summary of classification between the three levels of the fair value hierarchy of the Company's financial instruments measured at fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Avalon Laurel Avalon Laurel [Member] Avalon Laurel [Member] Unrecognized tax benefits Unrecognized Tax Benefits Avalon Silicon Valley Avalon Silicon Valley [Member] Represents the information pertaining to Avalon Silicon Valley, located at Sunnyvale, CA. Antidilutive securities excluded from computation of earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Amount of deferred compensation Deferred Compensation Arrangement with Individual, Recorded Liability Avalon Harbor Isle Avalon Harbor Isle [Member] Avalon Harbor Isle Mortgage Notes Payable, Unsecured Notes, and Term Loans Mortgage Notes Payable, Unsecured Notes, And Term Loans [Member] Mortgage Notes Payable, Unsecured Notes, And Term Loans Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] eaves Columbia Town Center I eaves Columbia Town Center [Member] Represents the information pertaining to Eaves Columbia Town Center, located at Columbia, MD. Avalon Acton II Avalon Acton II [Member] Avalon Acton II [Member] Same Store Operating Expense Same Store Operating Expense [Member] Same Store Operating Expense Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Avalon Plano Avalon Plano [Member] Avalon Plano eaves Mission Viejo eaves Mission Viejo [Member] eaves Mission Viejo Stock repurchase program, remaining authorized repurchase amount Share Repurchase Program, Remaining Authorized, Amount REAL ESTATE AND ACCUMULATED DEPRECIATION SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Text Block] Forward contract indexed to issuer's equity (in shares) Forward Contract Indexed to Issuer's Equity, Shares Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] Avalon Acton Avalon Acton [Member] Represents the information pertaining to Avalon Acton, located at Acton, MA. Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Risk free rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Avalon Denver West Avalon Denver West [Member] Avalon Denver West [Member] Entity Tax Identification Number Entity Tax Identification Number Avalon Fairway Hills - Meadows Avalon at Fairway Hills - Meadows [Member] Avalon at Fairway Hills - Meadows [Member] Number of real estate properties Number of Real Estate Properties Note receivable payments Proceeds from Sale and Collection of Notes Receivable New York City, NY New York City, NY [Member] New York City, NY [Member] Options outstanding at the beginning of the period (in dollars per share) Options outstanding at the end of the period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Common stock, shares issued (in shares) Common Stock, Shares, Issued Capital expenditures - non-real estate assets Payments for Capital Improvements, Non Real Estate Payments for Capital Improvements, Non Real Estate Communities under development rights Additional, Number of Communities Expected To Be Developed Additional number of communities owned (or in which a direct or indirect ownership interest is held) that can be expected to be developed. Weighted-average remaining lease term - operating leases Operating Lease, Weighted Average Remaining Lease Term Avalon Bloomfield Station Avalon Bloomfield Station [Member] Represents the information pertaining to Avalon Bloomfield Station, located at Bloomfield, NJ. Weighted average rate of return, commitments Other Commitments, Weighted Average Rate Of Return Other Commitments, Weighted Average Rate Of Return Avalon Mooresville Avalon Mooresville [Member] Avalon Mooresville Entity Public Float Entity Public Float Avalon at Traville Avalon at Traville [Member] Represents the information pertaining to Avalon at Traville, located at North Potomac, MD. Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Avalon Castle Rock at the Meadows Avalon Meadows at Castle Rock [Member] Avalon Meadows at Castle Rock [Member] Rental and other income Operating Lease, Lease Income Avalon Fairway Hills - Woods Avalon at Fairway Hills - Woods [Member] Avalon at Fairway Hills - Woods [Member] Non-allocated Segment Reporting, Reconciling Item, Corporate Nonsegment Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Development/ Redevelopment Development/Redevelopment Communities [Member] Development/Redevelopment Communities [Member] Security Exchange Name Security Exchange Name Accumulated amortization of deferred finance costs Accumulated Amortization, Debt Issuance Costs 20% capital gain (as a percent) Common Stock Dividends Long Term Capital Gain Percentage Represents the percentage of aggregate dividends paid during the period treated as a long-term capital gain for federal tax purposes. Credit Facility commitment Available borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Common stock issued through the dividend reinvestment plan (in shares) Stock Issued During Period, Shares, Dividend Reinvestment Plan Avalon Newcastle Commons II Avalon Newcastle Commons II [Member] Avalon Newcastle Commons II [Member] Pledging Purpose [Axis] Pledging Purpose [Axis] AVA Hollywood at La Pietra Place AVA Hollywood at La Pietra Place [Member] AVA Hollywood at La Pietra Place Avalon Parsippany Avalon Parsippany [Member] Avalon Parsippany Notes Payable 3.300 Maturities 2029 Notes Payable 3.300 Maturities 2029 [Member] Notes Payable 3.300 Maturities 2029 Avalon Commons Avalon Commons [Member] Represents the information pertaining to Avalon Commons, located at Smithtown, NY. Acquisition of real estate assets, including partnership interest Payments to acquire other real estate Payments to Acquire Other Real Estate Statement [Line Items] Statement [Line Items] Structured Investment Program interest income Structured Investment Program interest income Income (Loss) From Structured Investment Program Interest Income (Loss) From Structured Investment Program Interest Avalon Camarillo Avalon Camarillo [Member] Represents the information pertaining to Avalon Camarillo, located at Camarillo, CA. Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Variable rate notes Long-Term Debt, Percentage Bearing Variable Interest, Amount Avalon at Assembly Row Avalon at Assembly Row [Member] Avalon at Assembly Row [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Risk-free interest rate, maximum (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Common Stock Common Stock [Member] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Financing Leases Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Less accumulated depreciation Real Estate Investment Property, Accumulated Depreciation Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Effect of dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Dividends payable, common stock Dividends Payable, Common Stock Dividends Payable, Common Stock Avalon Oak Creek Avalon Oak Creek [Member] Represents the information pertaining to Avalon Oak Creek, located at Agoura Hills, CA. Avalon Flatirons Avalon Flatirons [Member] Avalon Flatirons Statistical Measurement [Domain] Statistical Measurement [Domain] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Avalon at Chestnut Hill Avalon at Chestnut Hill [Member] Represents the information pertaining to Avalon at Chestnut Hill, located at Chestnut Hill, MA. Schedule of nonvested performance awards granted Schedule of Nonvested Performance-Based Units Activity [Table Text Block] Related Party Transaction [Axis] Related Party Transaction [Axis] Interest Rate Swap Interest Rate Swap [Member] Utilities Segment Reporting, Utilities Segment Reporting, Utilities Payment of deferred financing costs Payments of Financing Costs Equity in (income) loss of, and return on, unconsolidated investments and noncontrolling interests, net of eliminations Gain (Loss) Unconsolidated Real Estate Entities, Net of Dividends or Distributions Gain (Loss) Unconsolidated Real Estate Entities, Net of Dividends or Distributions Avalon Wilton on River Road Avalon Wilton on River Road [Member] Avalon Wilton on River Road Expensed Transaction, Development and Other Pursuit Costs, and Casualty and Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Notes Payable Maturities 2034 Notes Payable Maturities 2034 [Member] Notes Payable Maturities 2034 Earnings per common share - basic: Calculation of Earnings per Common Share—basic Earnings Per Share, Basic [Abstract] Expensed transaction, development and other pursuit costs, net of recoveries Noncash Project Abandonment Costs Avalon Huntington Station Avalon Huntington Station [Member] Represents the information pertaining to Avalon Huntington Station, located at Huntington Station, NY. Ground Lease Ground Lease [Member] Ground Lease Operating Activities [Axis] Operating Activities [Axis] Land and Improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Land, Amount Pledged Status [Axis] Pledged Status [Axis] AVA North Point AVA North Point [Member] AVA North Point [Member] Shares withheld to satisfy employees' tax withholding and other liabilities, value Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Net borrowings under unsecured credit facility and commercial paper Proceeds From (Repayments of) Long-term Line of Credit And Commercial Paper Proceeds From (Repayments of) Long-term Line of Credit And Commercial Paper Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Net income per common share - basic (in dollars per share) Earnings per common share - basic (in dollars per share) Earnings Per Share, Basic Schedule of borrowing capacity under the Credit Facility Schedule of Line of Credit Facilities [Table Text Block] Commercial paper Commercial Paper [Member] Employee stock purchase plan, shares of common stock reserved for issuance Common Stock, Capital Shares Reserved for Future Issuance Interest Capitalized Interest Capitalized Disclosure [Text Block] Information about the amount of total interest cost capitalized in conjunction with assets that are being constructed for sale or lease during the periods presented. Summary of segment reporting information, by segment Schedule of Segment Reporting Information, by Segment [Table Text Block] San Jose, CA San Jose, CA [Member] San Jose, CA [Member] Increase in accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Avalon Hill Country Avalon Hill Country [Member] Avalon Hill Country 2028 Finance Lease, Liability, to be Paid, Year Three Number of apartment homes in communities owned Number of Apartment Homes in Communities Owned Number of Apartment Homes in Communities Owned Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] eaves Tunlaw Gardens eaves Tunlaw Gardens [Member] Represents the information pertaining to Eaves Tunlaw Gardens, located at Washington, DC. eaves Rancho Penasquitos eaves Rancho Penasquitos [Member] Represents the information pertaining to Eaves Rancho Penasquitos, located at San Diego, CA. Stock-based compensation expense Compensation expense Share-Based Payment Arrangement, Expense Hedging Designation [Domain] Hedging Designation [Domain] Avalon Brier Creek Avalon Brier Creek [Member] Avalon Brier Creek Development/redevelopment of real estate assets including land acquisitions and deferred development costs Payments to Develop Real Estate Assets Mortgage notes payable, net Secured Debt Avalon Durham Avalon Durham [Member] Avalon Durham Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Total liabilities and equity Liabilities and Equity Avalon Ocean Avenue Avalon Ocean Avenue [Member] Represents the information pertaining to Avalon Ocean Avenue, located at San Francisco, CA. Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Notes Payable 3.500 Maturities 2025 Notes Payable 3.500 Maturities 2025 [Member] Notes Payable 3.500 Maturities 2025 [Member] Avalon Framingham Avalon Framingham [Member] Avalon Framingham [Member] AVA Somerville AVA Somerville [Member] AVA Somerville [Member] Equity Method Investment [Table] Equity Method Investment [Table] AVA Ballston AVA Ballston [Member] Represents the information pertaining to AVA Ballston, located at Arlington, VA. Accounting Policies [Abstract] Accounting Policies [Abstract] Reconciliation of Undiscounted and Discounted Cash Flows for Operating Leases Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Avalon Clinton North Avalon Clinton North [Member] Represents the information pertaining to Avalon Clinton North, located at New York, NY. Concentration Risk Type [Domain] Concentration Risk Type [Domain] Forward Contracts Forward Contracts [Member] Avalon Carmel Avalon Carmel [Member] Avalon Carmel Unrecaptured 1250 gain (as a percent) Common Stock Dividends Unrecaptured Section 1250 Gain Percentage Represents the percentage of aggregate dividends paid during the period treated as an unrecaptured Section 1250 gain for federal tax purposes. Notes Payable Maturities 2026 Notes Payable Maturities 2026 [Member] Notes Payable Maturities 2026 [Member] Pay vs Performance Disclosure [Line Items] Avalon North Creek Avalon North Creek [Member] Avalon North Creek located in Bothell, WA [Member] Lease liability Operating Lease, Liability Preferred stock, liquidation preference (in dollars per share) Preferred Stock, Liquidation Preference Per Share eaves Cerritos eaves Cerritos [Member] Represents information pertaining to Eaves Cerritos. Real Estate Real Estate, Policy [Policy Text Block] Unconsolidated investments Payments to Acquire Businesses and Interest in Affiliates Avalon ParcSquare Avalon ParcSquare [Member] Represents the information pertaining to Avalon ParcSquare, located at Redmond, WA. Exercise Price, upper limit (in dollars per share) Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit Avalon Billerica Avalon Billerica [Member] Avalon Billerica Changes in total real estate assets SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Expired (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Resident security deposits Security Deposit Liability Disposal Group Name [Domain] Disposal Groups, Including Discontinued Operations, Name [Domain] Disposal Group Name [Domain] Name Measure Name Secured notes Secured Debt [Member] Lease Obligations [Abstract] Lease Obligations [Abstract] Class of Stock [Line Items] Class of Stock [Line Items] Avalon Great Neck Avalon Great Neck [Member] Avalon Great Neck [Member] Avalon Brooklyn Bay Avalon Brooklyn Bay [Member] Avalon Brooklyn Bay [Member] Avalon West Dublin Avalon West Dublin [Member] Avalon West Dublin Unsecured notes Unsecured notes Unsecured Debt [Member] eaves Fairfax City eaves Fairfax City [Member] Represents the information pertaining to Eaves Fairfax City, located at Fairfax, VA. Avalon Hayes Valley Avalon Hayes Valley [Member] Represents the information pertaining to Avalon Hayes Valley, located at San Francisco, CA. Total Long-Term Debt Total assets Assets Avalon Hawk Avalon Hawk [Member] Avalon Hawk Avalon Castle Hills Avalon Castle Hills [Member] Avalon Castle Hills Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Geographical [Domain] Geographical [Domain] Avalon La Jolla Colony Avalon La Jolla Colony [Member] Represents the information pertaining to Avalon La Jolla Colony, located at San Diego, CA. Income Taxes Income Tax, Policy [Policy Text Block] Avalon Cerritos Avalon Cerritos [Member] Avalon Cerritos [Member] Avalon at Prudential Center I Avalon at Prudential Center I [Member] Represents information pertaining to Avalon at Prudential Center I, located at Boston, MA. Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Avalon at Prudential Center II Avalon at Prudential Center II [Member] Represents information pertaining to Avalon at Prudential Center II, located at Boston, MA. eaves West Windsor eaves West Windsor [Member] eaves West Windsor Depreciation SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Depreciation Expense Concentration Risk Type [Axis] Concentration Risk Type [Axis] Gross operating real estate Real Estate Investment Property, at Cost Avalon on the Alameda Avalon on the Alameda [Member] Represents the information pertaining to Avalon on the Alameda, located at San Jose, CA. Avalon Mission Valley Avalon Mission Valley [Member] Avalon Mission Valley Avalon Miramar Park Place Avalon Miramar Park Place [Member] Avalon Miramar Park Place Interest Rate Swap December 2025 Interest Rate Swap December 2025 [Member] Interest Rate Swap December 2025 AVA RiNo AVA RiNo [Member] AVA RiNo [Member] Minimum distribution of adjusted taxable income for deducting dividends from federally taxable income (as a percent) Minimum Percentage of Distribution of Adjusted Taxable Income for Deducting Dividends from Federally Taxable Income Represents the minimum percentage of adjusted taxable income to be distributed as a condition for deducting dividends paid from Federally taxable income as applicable to a corporate real estate investment trust. Marketing Marketing Expense 2026 Finance Lease, Liability, to be Paid, Year One Impairment of long-lived assets held-for-use Impairment, Long-Lived Asset, Held-for-Use Dividends declared to common stockholders (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding NYC JV NYC JV [Member] NYC JV [Member] Right-of-use asset obtained in exchange for operating lease liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability AVA Pacific Beach AVA Pacific Beach [Member] Represents the information pertaining to AVA Pacific Beach, located at San Diego, CA. Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Number Of Development communities Owned Number Of Development communities Owned Number Of Development communities Owned Avalon Mission Oaks Avalon Mission Oaks [Member] Avalon Mission Oaks [Member] Avalon Arlington North Avalon Arlington North [Member] Represents the information pertaining to Avalon Arlington North, located at Arlington, VA. Avalon Warner Place Avalon Warner Place [Member] Represents the information pertaining to Avalon Warner Place, located at Canoga Park, CA. Avalon Marlborough II Avalon Marlborough II [Member] Avalon Marlborough II [Member] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Non-Same Store Operating Expense Non Same Store Operating Expense [Member] Non Same Store Operating Expense Organization and Basis of Presentation Organization And Basis of Presentation Policy [Policy Text Block] Organization And Basis of Presentation Policy Operating Leases Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Avalon at the Hingham Shipyard Avalon at the Hingham Shipyard [Member] Represents the information pertaining to Avalon at the Hingham Shipyard, located at Hingham, MA. Fixed rate mortgage notes payable Fixed Rate Mortgage Notes Payable [Member] Represents information pertaining to fixed rate mortgage notes payable. Asset Pledged as Collateral Asset Pledged as Collateral [Member] Assets Held for Sale and Discontinued Operations Discontinued Operations, Policy [Policy Text Block] Avalon Brighton Avalon Brighton [Member] Avalon Brighton Avalon Towers Bellevue Avalon Towers Bellevue [Member] Represents the information pertaining to Avalon Towers Bellevue, located at Bellevue, WA. Annual Fee Annual Fee [Member] Annual Fee Gross real estate assets non-allocated Gross Real Estate Assets Non-allocated Gross Real Estate Assets Non-allocated Summary of tax components of the entity's common dividends declared Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Implied volatility (as a percent) Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Weighted Average Implied Volatility Rate The implied volatility rate used in valuation technique of calculation of fair value of awards. Plan Name [Axis] Plan Name [Axis] PEO PEO [Member] Avalon San Ramon Avalon San Ramon [Member] Avalon San Ramon Avalon Newcastle Commons I Avalon Newcastle Commons I [Member] Avalon Newcastle Commons I [Member] Additional letters of credit Other Letter of Credit [Member] Other Letter of Credit [Member] Income from unconsolidated investments Income from unconsolidated investments Unconsolidated Real Estate Entities Gain (loss) on investments Unconsolidated Real Estate Entities Gain (loss) on investments Non-employee directors Non Employee Director [Member] Represents non-employee directors of the entity. Number of finance leases for parking garages adjacent to communities Number Of Finance Leases For Parking Garages Adjacent To Communities Number of Finance Leases for Parking Garages Adjacent to Communities Estimated volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Accumulated earnings less dividends Retained Earnings [Member] Avalon Towers on the Peninsula Avalon Towers on the Peninsula [Member] Represents the information pertaining to Avalon Towers on the Peninsula, located at Mountain View, CA. Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash, cash equivalents and restricted cash, beginning of year Cash, cash equivalents and restricted cash, end of year Cash, cash equivalents and restricted cash reported in the Consolidated Statements of Cash Flows Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Derivative assets Derivative Asset AVA Little Tokyo AVA Little Tokyo [Member] Represents the information pertaining to AVA Little Tokyo, located at Los Angeles, CA. Severe Weather and Fire Severe Weather and Fire [Member] Severe Weather and Fire Sale of Stock [Domain] Sale of Stock [Domain] Product and Service [Domain] Product and Service [Domain] eaves San Jose eaves San Jose [Member] Represents the information pertaining to Eaves San Jose, located at San Jose, CA. Avalon at Bear Creek Avalon at Bear Creek [Member] Represents the information pertaining to Avalon at Bear Creek, located at Redmond, WA. Land and improvements Land and Land Improvements Avalon Old Bridge Avalon Old Bridge [Member] Avalon Old Bridge [Member] Parent Parent [Member] Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total Liabilities Liabilities, Fair Value Disclosure eaves Walnut Creek Eaves Walnut Creek [Member] Represents the information pertaining to Eaves Walnut Creek, located at Walnut Creek, CA. Notional balance Derivative, Notional Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Other commitment, new Other Commitment, New Other Commitment, New Avalon Bothell Commons Avalon Bothell Commons [Member] Avalon Bothell Commons Avalon Bear Hill Avalon Bear Hill [Member] Represents the information pertaining to Avalon Bear Hill, located at Waltham, MA. City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Avalon Doral Avalon Doral [Member] Avalon Doral [Member] Avalon Huntington Beach Avalon Huntington Beach [Member] Avalon Huntington Beach [Member] Capitalized interest during the development and redevelopment of real estate assets Interest Costs Capitalized Gross real estate Real Estate Gross At Carrying Value Excluding Gross Real Estate Assets Held For Sale Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate, excluding gross real estate assets held for sale. Avalon Benbrook Avalon Benbrook [Member] Avalon Benbrook Commercial paper, maximum aggregate amount outstanding Commercial Paper, Maximum Borrowing Capacity Commercial Paper, Maximum Borrowing Capacity Avalon Townhome Collection Arundel Mills Avalon Townhome Collection Arundel Mills [Member] Avalon Townhome Collection Arundel Mills Avalon Pleasanton I Avalon Pleasanton I [Member] Avalon Pleasanton I Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General and administrative expense General and Administrative Expense Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Land held for development Land Available for Development Avalon Highland Creek Avalon Highland Creek [Member] Avalon Highland Creek AVA Capitol Hill AVA Capitol Hill [Member] AVA Capitol Hill [Member] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Noncontrolling interest activity Noncontrolling Interest, Period Increase (Decrease) Cash Flow Hedges Interest Rate Caps Cash Flow Hedging [Member] San Diego, CA San Diego, CA [Member] San Diego, CA [Member] Number of reportable segments not disclosed flag Number Of Reportable Segments Not Disclosed Flag Number Of Reportable Segments Not Disclosed Flag Notes Receivable, net Notes Receivable, Fair Value Disclosure Avalon Princeton Avalon Princeton [Member] Avalon Princeton [Member] Auditor Name Auditor Name Avalon Southpoint Avalon Southpoint [Member] Avalon Southpoint Gain on sale of communities, net Gain on sale of communities, net Gains (Losses) on Sales of Investment Real Estate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract] Organization, Basis of Presentation, and Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Supplemental Cash Flow Information Supplemental Cash Flow Information [Abstract] eaves San Dimas eaves San Dimas [Member] Represents the information pertaining to Eaves San Dimas, located at San Dimas, CA. Other Performance Measure, Amount Other Performance Measure, Amount Weighted average exercise price per share Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Aggregate cost of total real estate for federal income tax purposes SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Federal Income Tax Basis Avalon Northwest Hills Avalon Northwest Hills [Member] Avalon Northwest Hills AVA Studio City I AVA Studio City I [Member] Represents the information pertaining to AVA Studio City I, located at Los Angeles, CA. Related Party [Domain] Related and Nonrelated Parties [Domain] Number of shares forfeited (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, Forfeited Gain (loss) on equity securities Gain (loss) on equity securities Equity Securities, FV-NI, Gain (Loss) Derivative Instrument [Axis] Derivative Instrument [Axis] Avalon Playa Vista Avalon Playa Vista [Member] Represents information pertaining to Avalon Playa Vista. Operating Income (Loss) Operating Income (Loss) [Member] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Unconsolidated investments Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures AVA Newport AVA Newport [Member] Represents the information pertaining to AVA Newport, located at Costa Mesa, CA. Outstanding funding, commitments Other Commitment, Outstanding Funding Other Commitment, Outstanding Funding Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Cash flow hedge (gains) losses reclassified to earnings Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Cash paid during the year for interest, net of amount capitalized Interest Paid, Excluding Capitalized Interest, Operating Activity Pacific Northwest Pacific Northwest [Member] Represents information pertaining to Pacific Northwest. Document Fiscal Year Focus Document Fiscal Year Focus eaves Fair Lakes eaves Fair Lakes [Member] Represents the information pertaining to Eaves Fair Lakes, located at Fairfax, VA. Right of use lease assets Operating Lease, Right-of-Use Asset Restricted Stock and Restricted Stock Units Restricted Stock and Restricted Stock Units [Member] Represents information pertaining to restricted stock and restricted stock units. Plan Name [Domain] Plan Name [Domain] Notes Payable 4.3500 Maturities 2030 Notes Payable 4.3500 Maturities 2030 [Member] Notes Payable 4.3500 Maturities 2030 Current Communities Current Communities [Member] Represents the real estate properties for current communities. Weighted average period for recognition of unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition AVA 55 Ninth AVA 55 Ninth [Member] Represents the information pertaining to AVA 55 Ninth, located at San Francisco, CA. Avalon San Bruno I Avalon San Bruno I [Member] Represents the information pertaining to Avalon San Bruno I, located at San Bruno, CA. Common stock shares issued in connection with stock options exercised (in shares) Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Rental and non-rental related income Rental And Non-Rental [Member] Rental And Non-Rental [Member] Property management and other indirect operating expenses, net of corporate income Indirect Operating Expenses Net Of Corporate Income The aggregate amount of indirect operating expenses, net of corporate income. Derivative Instruments and Hedging Activities Derivatives, Policy [Policy Text Block] Segment Reporting Segment Reporting Disclosure [Text Block] eaves North Dallas eaves North Dallas [Member] eaves North Dallas Avalon Lake Norman Avalon Lake Norman [Member] Avalon Lake Norman Financial Instruments Measured/Discussed at Fair Value Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Development Communities Development Communities [Member] Development Communities [Member] Avalon Oakridge I Avalon Oakridge I [Member] Avalon Oakridge I Avalon Dunn Loring Avalon Dunn Loring [Member] Avalon Dunn Loring [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Notes Payable Maturities 2033 Notes Payable Maturities 2033 [Member] Notes Payable Maturities 2033 Lessee Considerations Lessee, Leases [Policy Text Block] Dispositions, including casualty losses, and other activity Real Estate Dispositions Including Impairment Loss on Planned Dispositions Amount of real estate investments disposed off including impairment loss on planned dispositions during the period. Number of purchase periods Share Based Compensation Arrangement by Share Based Payment Award Number of Purchase Period Represents the number of purchase periods to acquire shares of the entity's common stock through payroll deductions. Avalon Teaneck Avalon Teaneck [Member] Avalon Teaneck [Member] AVA NoMa AVA NoMa [Member] AVA NoMa [Member] Notes Payable 2.300 Maturities 2030 Notes Payable 2.300 Maturities 2030 [Member] Notes Payable 2.300 Maturities 2030 Capital expenditures - existing real estate assets Payments for Capital Improvements Avalon Irvine II Avalon Irvine II [Member] Represents the information pertaining to Avalon Irvine II, located at Irvine, CA. Avalon Midtown West Avalon Midtown West [Member] Represents the information pertaining to Avalon Midtown West, located at New York, NY. Exercise Price Range from Dollars 172.00 to 181.99 Exercise Price Range from Dollars 172.00 to 181.99 [Member] Exercise Price Range from Dollars 172.00 to 181.99 Lease liability Finance Lease, Liability Arrangement Duration Trading Arrangement Duration Avalon Bonterra Avalon Bonterra [Member] Avalon Bonterra [Member] Estimated volatility, maximum (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Avalon Monrovia Avalon Monrovia [Member] Avalon Monrovia [Member] Segments [Axis] Segments [Axis] Other commitments, number of SIP commitments Other Commitments, Number of SIP Commitments Other Commitments, Number of SIP Commitments Local Phone Number Local Phone Number Lead Independent Director Lead Independent Director [Member] Represents the employee lead independent director of the entity. Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Market closing price (in dollars per share) Share Price Employee stock purchase plan, discounted stock price percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Discount from Market Price, Purchase Date Stock-Based Compensation Plans Share-Based Payment Arrangement [Text Block] Repurchase of common stock, including repurchase costs (in shares) Stock Repurchased and Retired During Period, Shares Avalon Arundel Crossing II Avalon Arundel Crossing II [Member] Avalon Arundel Crossing II ASSETS Assets [Abstract] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Other Commitments [Axis] Other Commitments [Axis] Debt Instrument [Axis] Debt Instrument [Axis] Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Fair Value Fair Value Disclosures [Text Block] Loss on extinguishment of debt, net Loss on extinguishment of debt, net Gain (Loss) on Extinguishment of Debt Buildings and improvements Investment Building and Building Improvements Kanso Parsippany Kanso Parsippany [Member] Kanso Parsippany Treasury stock, value, acquired, cost method Treasury Stock, Value, Acquired, Cost Method Investment, Name [Axis] Investment, Name [Axis] Stated interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage Real Estate Properties [Domain] Real Estate Properties [Domain] Entity Voluntary Filers Entity Voluntary Filers Contract with customer, receivable, net Contract with Customer, Receivable, after Allowance for Credit Loss Avalon North Station Avalon North Station [Member] Avalon North Station [Member] Non Executive Chairman Non Executive Chairman [Member] Non Executive Chairman Notes Payable Maturities 2035 Notes Payable Maturities 2035 [Member] Notes Payable Maturities 2035 Expansion Regions Expansion Regions [Member] Expansion Regions Avalon Morrison Park Avalon Morrison Park [Member] Represents the information pertaining to Avalon Morrison Park, located at San Jose, CA. Avalon Pasadena Avalon Pasadena [Member] Represents the information pertaining to Avalon Pasadena, located at Pasadena, CA. Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Secured Debt and Commercial Paper Program Secured Debt and Commercial Paper Program [Member] Secured Debt and Commercial Paper Program Additional disclosures Share-Based Payment Arrangement, Additional Disclosure [Abstract] Unsecured Notes, 5.00% Unsecured Notes 5.000 Percent [Member] Unsecured Notes 5.000 Percent eaves Los Feliz eaves Los Feliz [Member] Represents the information pertaining to Eaves Los Feliz, located at Los Feliz, CA. Avalon Glendale Avalon Glendale [Member] Represents the information pertaining to Avalon Glendale, located at Burbank, CA. Avalon Wharton Avalon Wharton [Member] Represents the information pertaining to Avalon Wharton, located at Wharton, NJ. Impairment of investment in unconsolidated entities Investment, Impairment Loss Investment, Impairment Loss AVA Ballston Square AVA Ballston Square [Member] Represents the information pertaining to Avalon Ballston Square, located at Arlington, VA. Total Assets Assets, Fair Value Disclosure Avalon Campbell Avalon Campbell [Member] Avalon Campbell [Member] Avalon at Edgewater I Avalon at Edgewater I [Member] Represents the information pertaining to Avalon at Edgewater I, located at Edgewater, NJ. Property Technology Investments Property Technology Investments [Member] Property Technology Investments Audit Information [Abstract] Audit Information [Abstract] Share-based compensation arrangement by share-based payment award, equity instruments other than options, aggregate intrinsic value, outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Real Estate Property Ownership [Axis] Real Estate Property Ownership [Axis] Avalon Wolf Ranch Avalon Wolf Ranch [Member] Avalon Wolf Ranch Related Party [Axis] Related and Nonrelated Parties [Axis] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Avalon 555 President Avalon 555 President [Member] Avalon 555 President [Member] Non-employee director serving as the chairperson of the Audit Committee Non Employee Director Serving As A Chairperson of the Audit Committee [Member] Non Employee Director Serving As A Chairperson of the Audit Committee [Member] Avalon Dublin Station II Avalon Dublin Station II [Member] Avalon Dublin Station II [Member] Restatement Determination Date: Restatement Determination Date [Axis] Avalon Townhome Collection Bee Cave Avalon Townhomes Collection Bee Cave [Member] Avalon Townhomes Collection Bee Cave Avalon Woburn Avalon Woburn [Member] Avalon Woburn [Member] Notes Payable 2.900 Maturities 2026 Notes Payable 2.900 Maturities 2026 [Member] Notes Payable 2.900 Maturities 2026 [Member] Number of apartment homes acquired Number Of Apartment Homes Acquired Number of Apartment Homes Acquired Avalon Kendall Avalon Kendall [Member] Avalon Kendall Avalon Falls Church Avalon Falls Church [Member] Avalon Falls Church [Member] Name Trading Arrangement, Individual Name Number of new ground lease Number of New Ground Lease Number of New Ground Lease Face amount, debt instrument Debt Instrument, Face Amount Severe Weather Severe Weather [Member] Severe Weather Share Repurchase Program [Axis] Share Repurchase Program [Axis] Name Awards Close in Time to MNPI Disclosures, Individual Name Avalon North Palm Beach Avalon North Palm Beach [Member] Avalon North Palm Beach Outstanding at the beginning of the period (in dollars per share) Outstanding at the ending of the period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Other commitment Other Commitment ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Avalon Yonkers Avalon Yonkers [Member] Avalon Yonkers located in Yonkers, NY [Member] Asset Acquisition [Line Items] Asset Acquisition [Line Items] Amortization of deferred compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Southeast Florida Southeast Florida [Member] Southeast Florida Reconciliation of Undiscounted and Discounted Cash Flows for Finance Leases Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Property Technology Investments, Direct Investments Property Technology Investments, Direct Investments [Member] Property Technology Investments, Direct Investments Auditor Firm ID Auditor Firm ID Segments [Domain] Segments [Domain] Total Credit Facility available Line of Credit Facility, Remaining Borrowing Capacity eaves Seal Beach eaves Seal Beach [Member] Represents the information pertaining to Eaves Seal Beach, located at Huntington Beach, CA. Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Amortization of deferred financing costs and debt discount Amortization of Debt Issuance Costs and Discounts Northern California Northern California [Member] Represents information pertaining to Northern California. Earnings per Common Share Earnings Per Share, Policy [Policy Text Block] Noncontrolling Interests Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Schedule of net operating income from real estate assets sold or held for sale, not classified as discontinued operations Schedule of Net Operating Income from Real Estate Assets Sold or Held for Sale, Not Classified as Discontinued Operations [Table Text Block] Schedule of Net Operating Income from Real Estate Assets Sold or Held for Sale, Not Classified as Discontinued Operations [Table Text Block] Structured Investment Program Structured Investment Program [Member] Structured Investment Program AVA Van Ness AVA Van Ness [Member] Represents information pertaining to AVA Van Ness, located at Washington, DC. Preferred stock, $0.01 par value; $25 liquidation preference; 50,000,000 shares authorized at December 31, 2025 and December 31, 2024; zero shares issued and outstanding at December 31, 2025 and December 31, 2024 Preferred Stock, Value, Issued Accrued interest payable Interest Payable Notes Payable 3.200 Maturities 2028 Notes Payable 3.200 Maturities 2028 [Member] Notes Payable 3.200 Maturities 2028 All Executive Categories All Executive Categories [Member] Common stock, $0.01 par value; 280,000,000 shares authorized at December 31, 2025 and December 31, 2024; 140,080,657 and 142,254,022 shares issued and outstanding at December 31, 2025 and December 31, 2024, respectively Common Stock, Value, Issued Finance lease, right-of-use asset Finance Lease, Right-of-Use Asset, after Accumulated Amortization Avalon Somerville Station Avalon Somerville Station [Member] Avalon Somerville Station Net income allocated to unvested restricted shares Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Operating Activities [Domain] Operating Activities [Domain] Retail square feet sold Retail Square Feet Sold Retail Square Feet Sold Commitments and contingencies Commitments and Contingencies Preferred stock, liquidation preference, value Preferred Stock, Liquidation Preference, Value Lease liabilities Lease, Liability Lease, Liability Avalon Residences at the Hingham Shipyard Avalon Residences at the Hingham Shipyard [Member] Avalon Residences at the Hingham Shipyard Avalon at Edgewater II Avalon at Edgewater II [Member] Avalon at Edgewater II located in Edgewater, NJ [Member] Noncontrolling interests Noncontrolling Interest [Member] DownREIT partnership DownREIT Partnership [Member] DownREIT Partnership eaves Santa Margarita eaves Santa Margarita [Member] Represents the information pertaining to Eaves Santa Margarita, located at Rancho Santa Margarita, CA. Ownership percentage of equity method investment Equity Method Investment, Ownership Percentage Number of apartment homes sold Number Of Apartment Homes Sold Number of Apartment Homes Sold Avalon at The Pinehills Avalon at the Pinehills [Member] Represents the information pertaining to Avalon at The Pinehills, located at Plymouth, MA. Long-term debt, cap interest rate Long-Term Debt, Cap Interest Rate Long-Term Debt, Cap Interest Rate Avalon Northborough Avalon Northborough [Member] Represents the information pertaining to Avalon Northborough, located at Northborough, MA. PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Earnings per common share - diluted: Calculation of Earnings per Common Share—diluted Earnings Per Share, Diluted [Abstract] Note receivable lending Payments to Acquire Mortgage Notes Receivable Deferred development costs Other Deferred Costs, Net Hedging Designation [Axis] Hedging Designation [Axis] Brandywine Brandywine [Member] Represents information pertaining to Brandywine Apartments of Maryland, LLC. Notes Payable Maturities 2030 Notes Payable Maturities 2030 [Member] Notes Payable Maturities 2030 Interest Rate Swap July 2025 Interest Rate Swap July 2025 [Member] Interest Rate Swap July 2025 Summary of Details Regarding Acquired Communities Asset Acquisition [Table Text Block] Avalon Vista Avalon Vista [Member] Represents the information pertaining to Avalon Vista, located at Vista, CA. Avalon Walnut Ridge II Avalon Walnut Ridge II [Member] Represents the information pertaining to Avalon Walnut Ridge II, located at Walnut Creek, CA. Avalon Miramar Avalon Miramar [Member] Avalon Miramar Percentage of physical occupancy Attainment Percentage of Physical Occupancy Represents the attainment percentage of physical occupancy to consider a community as stabilized occupancy. Derivative Contract [Domain] Derivative Contract [Domain] Issuance of common stock, net Proceeds from Issuance of Common Stock Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Domain] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Domain] Avalon Fort Lauderdale Avalon Fort Lauderdale [Member] Avalon Fort Lauderdale All Individuals All Individuals [Member] Avalon Merrick Park Avalon Merrick Park [Member] Avalon Merrick Park Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Name Forgone Recovery, Individual Name Stock options awarded, term Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Avalon Addison Avalon Addison [Member] Avalon Addison Avalon Burbank Avalon Burbank [Member] Represents the information pertaining to Avalon Burbank, located at Burbank, CA. Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] eaves RockMeadow eaves RockMeadow [Member] eaves RockMeadow Fair value adjustment related to equity Equity, Fair Value Adjustment Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Weighted average interest rate, debt (as a percent) Debt, Weighted Average Interest Rate Joint Venture Partner Joint Venture Partner [Member] Joint Venture Partner eaves Redmond Campus II eaves Redmond Campus II [Member] eaves Redmond Campus II Avalon Walnut Ridge I Avalon Walnut Ridge I [Member] Represents information pertaining to Avalon Walnut Ridge I, located at Walnut Creek, CA. Avalon Riverview North Avalon Riverview North [Member] Represents the information pertaining to Avalon Riverview North, located at Long Island City, NY. Schedule of summary of consolidated hedging derivatives, excluding derivatives executed to hedge debt on communities classified as held for sale Schedule of Derivative Instruments [Table Text Block] Cash Payment Cash Payment [Member] Cash Payment Proceeds from notes payable Proceeds from Notes Payable Gain on sale of real estate assets, net Gain (Loss) on Sale of Properties Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Geographical [Axis] Geographical [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Avalon Wilshire Avalon Wilshire [Member] Represents the information pertaining to Avalon Wilshire, located at Los Angeles, CA. Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Number of office leases Number Of Office Leases Number of Office Leases Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Title of 12(b) Security Title of 12(b) Security Options exercisable intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Avalon Frisco North Avalon Frisco North [Member] Avalon Frisco North Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Non-employee director serving as a chairperson of the Nominating and Corporate Governance and Investment and Finance Committees Non Employee Director Serving As A Chairperson of the Nominating and Corporate Governance or Investment and Finance Committees [Member] Non Employee Director Serving As A Chairperson of the Nominating and Corporate Governance or Investment and Finance Committees [Member] Avalon Southlands Avalon Southlands [Member] Avalon Southlands [Member] Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] San Francisco, CA San Francisco, CA [Member] San Francisco, CA [Member] Earnings per Common Share Earnings Per Share [Abstract] AVA Fort Greene AVA Fort Greene [Member] Represents the information pertaining to AVA Fort Greene, located at Brooklyn, NY. 2030 Lessee, Operating Lease, Liability, to be Paid, Year Five AVA South End AVA South End [Member] AVA South End Notes Payable 5.350 Maturities 2034 Notes Payable 5.350 Maturities 2034 [Member] Notes Payable 5.350 Maturities 2034 Estimated performance award value based on total shareholder return measure (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price Avalon First and M Avalon First and M [Member] Represents the information pertaining to Avalon First and M, located at Washington, D.C. Sale of Real Estate Gross Sales Price Sale of Real Estate Gross Sales Price Represents the gross sales price of real estate assets sold. New England Region New England region [Member] New England region Repurchase of common stock (in shares) Treasury Stock, Shares, Acquired Thereafter Finance Lease, Liability, to be Paid, after Year Five Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Avalon Frisco Avalon Frisco [Member] Avalon Frisco Avalon Simi Valley Avalon Simi Valley [Member] Represents the information pertaining to Avalon Simi Valley, located at Simi Valley, CA. Award Timing Disclosures [Line Items] eaves Glover Park eaves Glover Park [Member] Represents the information pertaining to Eaves Glover Park, located at Washington, DC. Number of commercial properties owned Number Of Commercial Properties Owned Number of commercial properties owned. Equity Equity [Text Block] Total shareholder return metrics (in shares) Share-based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period Based On Total Shareholder Metrics Share-based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period Based On Total Shareholder Metrics Operating expenses from real estate assets sold or held for sale Operating Expenses From Assets Held For Sale, Not Classified As Discontinued Operations Operating Expenses From Assets Held for Sale, Not Classified as Discontinued Operations Net income attributable to common stockholders Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] Total real estate, net Total net real estate Real Estate Investment Property, Net Total Balance, beginning of period Balance, end of period SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross Non Qualified Employee Stock Purchase Plan Non Qualified Employee Stock Purchase Plan [Member] Represents information pertaining to the entity's 1996 Non-Qualified Employee Stock Purchase Plan. Long-Term Loan, Maximum Borrowing Capacity, Guarantee, Percentage Long-Term Loan, Maximum Borrowing Capacity, Guarantee, Percentage Long-Term Loan, Maximum Borrowing Capacity, Guarantee, Percentage eaves West Valley eaves West Valley [Member] Represents the information pertaining to Eaves West Valley, located at San Jose, CA. Continuous Equity Program CEP V Continuous Equity Program CEP V [Member] Continuous Equity Program CEP V [Member] Segment Reporting Information [Line Items] Segment Reporting Segment Reporting Information [Line Items] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Repurchase of common stock, net Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Avalon Piscataway Avalon Piscataway [Member] Avalon Piscataway located in Piscataway, NJ [Member] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Avalon Rockville Centre II Avalon Rockville Centre II [Member] Avalon Rockville Centre II [Member] Net operating income Total NOI Operating Income (Loss) Variable rate unsecured credit facility Line of Credit [Member] Avalon at Cahill Park Avalon at Cahill Park [Member] Represents the information pertaining to Avalon at Cahill Park, located at San Jose, CA. Payments to acquire real estate Payments to Acquire Real Estate Accumulated earnings less dividends Retained Earnings (Accumulated Deficit) Common stock value, remaining to be authorized under continuous equity program Common Stock Value, Remaining To Be Authorized Under Continuous Equity Program Common Stock Value, Remaining To Be Authorized Under Continuous Equity Program Name of Property [Axis] Name of Property [Axis] eaves Foster City eaves Foster City [Member] Represents the information pertaining to Eaves Foster City, located at Foster City, CA. Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Avalon Toscana Avalon Toscana [Member] Avalon Toscana [Member] Avalon Westminster Promenade Avalon Westminster Promenade [Member] Avalon Westminster Promenade Notes Payable Maturities Thereafter Notes Payable Maturities Thereafter [Member] Represents notes payable which mature after the last year presented. Uncollectible Lease Revenue Reserves Revenue Recognition, Leases [Policy Text Block] Long-term loan, number of extension options Long-term Loan, Number Of Extension Options Long-term Loan, Number Of Extension Options Subsequent Event Type [Domain] Subsequent Event Type [Domain] Avalon at Mission Bay I Avalon at Mission Bay I [Member] Represents the information pertaining to Avalon at Mission Bay I, located at San Francisco, CA. Capital gain tax rate (as a percent) Capital Gain Tax Rate Capital Gain Tax Rate Converted to common stock (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Converted to Common Shares, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Converted to Common Shares, Weighted Average Grant Date Fair Value Legacy JV Legacy JV [Member] Legacy JV [Member] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Statement [Table] Statement [Table] Expensed transaction, development and other pursuit costs, net of recoveries Other nonoperating income (expense) Other Nonoperating Income (Expense) Avalon San Dimas Avalon San Dimas [Member] Represents the information pertaining to Avalon San Dimas, located at San Dimas, CA. Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] eaves Creekside eaves Creekside [Member] Represents the information pertaining to Eaves Creekside, located at Mountain View, CA. Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Avalon Townhome Collection Florham Park Avalon Townhome Collection Florham Park [Member] Avalon Townhome Collection Florham Park Avalon West Palm Beach Avalon West Palm Beach [Member] Avalon West Palm Beach [Member] Avalon Quincy Avalon Quincy [Member] Avalon Quincy [Member] Lessor Considerations Lessor, Leases [Policy Text Block] Emergency Response and Fire Emergency Response and Fire [Member] Emergency Response and Fire Repayment of unsecured debt Repayment of unsecured debt Repayments of Unsecured Debt All Adjustments to Compensation All Adjustments to Compensation [Member] Fixed rate notes Long-Term Debt, Percentage Bearing Fixed Interest, Amount Amendment Flag Amendment Flag Archstone Redmond Lakeview Archstone Redmond Lakeview [Member] Represents the information pertaining to Archstone Redmond Lakeview, located at Redmond, WA. Proceeds from sale of real estate, net of selling costs Proceeds from Sale, Real Estate, Held-for-Investment eaves Pacifica eaves Pacifica [Member] eaves Pacifica Termination Date Trading Arrangement Termination Date Avalon Mountain View Avalon Mountain View [Member] Represents the information pertaining to Avalon Mountain View, located at Mountain View, CA. Development / Redevelopment Development Redevelopment [Member] Represents information pertaining to the Development/Redevelopment Communities segment of the entity. Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Avalon at Bedford Center Avalon at Bedford Center [Member] Represents the information pertaining to Avalon at Bedford Center, located at Bedford, MA. Notes Payable 2.450 Maturities 2031 Notes Payable 2.450 Maturities 2031 [Member] Notes Payable 2.450 Maturities 2031 Unsecured Notes 4.350 Percent Unsecured Notes 4.350% [Member] Unsecured Notes 4.350% 2020 Stock Repurchase Program 2020 Stock Repurchase Program [Member] 2020 Stock Repurchase Program Avalon at Lexington Hills Avalon at Lexington Hills [Member] Represents the information pertaining to Avalon at Lexington Hills, located at Lexington, MA. Weighted-average discount rate - operating leases Operating Lease, Weighted Average Discount Rate, Percent Schedule of information with respect to stock options granted Share-Based Payment Arrangement, Option, Activity [Table Text Block] Percentage of compensation received by sales agent Sales Agent Compensation Percentage, Continuous Equity Program Represents the compensation received by sales agent relating to a continuous equity program. Weighted average common shares - basic (in shares) Weighted Average Number of Shares Outstanding, Basic NEW JERSEY NEW JERSEY Schedule of earnings per common share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Options exercisable at the end of the period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Related Party Transaction [Domain] Related Party Transaction [Domain] Exercise Price Range [Domain] Exercise Price Range [Domain] Repairs & Maintenance Cost of Property Repairs and Maintenance Subsequent Events [Abstract] Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] NORTH CAROLINA NORTH CAROLINA Operating lease, expense Operating Lease, Expense Debt Disclosure [Abstract] Debt Disclosure [Abstract] Schedule of restricted stock granted Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] Expenses: Costs and Expenses [Abstract] Details regarding the real estate sales Schedule of Disposal Groups Including Discontinued Operations Summary of Real Estate Dispositions [Table Text Block] Tabular disclosure of disposal groups, which may include real estate sales relating to communities and land parcels. Variable rate unsecured credit facility and commercial paper, net Long-term Line Of Credit And Commercial Paper Long-term Line Of Credit And Commercial Paper Total dividends (as a percent) Common Stock, Dividends, Percentage Common Stock, Dividends, Percentage Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Avalon Saugus Avalon Saugus [Member] Avalon Saugus [Member] AVA Wheaton AVA Wheaton [Member] AVA Wheaton [Member] Stock-Based Compensation Plans Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Avalon Montville Avalon Montville [Member] Avalon Montville Avalon Potomac Yard Avalon Potomac Yard [Member] Avalon Potomac Yard [Member] Casualty and impairment loss Impairment of real estate and land Impairment of Real Estate Avalon Encino Avalon Encino [Member] Represents the information pertaining to Avalon Encino, located at Los Angeles, CA. The Statesman The Statesman [Member] Represents information pertaining to The Statesman, located at Washington, DC. Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Estimated number of apartment homes in communities to be developed Estimated Number Of Apartment Homes In Communities Expected To Be Developed Estimated number of apartment homes in communities awaiting development. Use of Estimates Use of Estimates, Policy [Policy Text Block] Avalon Union City Avalon Union City [Member] Represents the information pertaining to Avalon Union City, located at Union City, CA. Avalon at Grosvenor Station Avalon at Grosvenor Station [Member] Represents the information pertaining to Avalon at Grosvenor Station, located at North Bethesda, MD. Construction in progress, including land Construction in Progress, Gross Avalon Chino Hills Avalon Chino Hills [Member] Avalon Chino Hills [Member] Number of Options (in shares) Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding Avalon Clarendon Avalon Clarendon [Member] Avalon Clarendon [Member] Avalon Marlborough Avalon Marlborough [Member] Avalon Marlborough [Member] Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Forfeited (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Avalon Alderwood Place Avalon Alderwood Place [Member] Avalon Alderwood Place [Member] Abandoned pursuits costs Business Combination, Acquisition Related Costs, Abandoned Pursuit Costs Business Combination, Acquisition Related Costs, Abandoned Pursuit Costs Total liabilities Liabilities Commitments and Contingencies Disclosure [Table] Commitments and Contingencies Disclosure [Table] Commitments and Contingencies Disclosure [Table] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Line of credit facility, commitment fee (as a percent) Line of Credit Facility, Commitment Fee Percentage Product Concentration Risk Product Concentration Risk [Member] 2030 Finance Lease, Liability, to be Paid, Year Five Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Corporate Overhead Corporate Overhead [Member] Represents the corporate overhead relating to real estate properties. Avalon Boonton Avalon Boonton [Member] Avalon Boonton [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] 2025 Acquisition 2025 Acquisition [Member] 2025 Acquisition Avalon Hunt Valley West Avalon Hunt Valley West [Member] Avalon Hunt Valley West Issuance of common stock, net of withholdings Stock Issued During Period, Value, New Issues Avalon Baker Ranch Avalon Baker Ranch [Member] Represents the information pertaining to Avalon Baker Ranch, located at Lake Forest, CA. Avalon Westbury Avalon Westbury [Member] Represents the information pertaining to Avalon Westbury, located at Westbury, NY. Consolidation Items [Axis] Consolidation Items [Axis] Avalon Russett Avalon Russett [Member] Represents the information pertaining to Avalon Russett, located at Laurel, MD. Counterparty Name [Axis] Counterparty Name [Axis] Notes Payable 5.000 Maturities 2033 Notes Payable 5.000 Maturities 2033 [Member] Notes Payable 5.000 Maturities 2033 Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member]