Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Estimated Fair Value Portion at Fair Value Measurement [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Carrying Value Reported Value Measurement [Member] Equity Method Investments Equity Method Investments [Member] Subsequent Event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Acquisition and certain other transaction related costs Acquisition and certain other transaction related costs Business Combination, Acquisition-Related Cost, Expense Adjustment to Compensation, Amount Adjustment to Compensation Amount Real Estate Real Estate [Line Items] Segment Reporting [Abstract] Segment Reporting [Abstract] Number of extension options Debt Instrument, Number Of Extension Options Debt Instrument, Number Of Extension Options Common shares of beneficial interest, $.01 par value: 300,000,000 shares authorized, 242,189,353 and 242,121,025 shares issued and outstanding, respectively Common Stock, Value, Issued Schedule of Additional Outstanding Debt Schedule of Long-Term Debt Instruments [Table Text Block] Number of management agreements Related Party, Management Agreements Related Party, Management Agreements Restatement Determination Date Restatement Determination Date Derivative Instrument [Axis] Derivative Instrument [Axis] Adjustment to (loss) gain on sale of real estate Gains (Losses) on Sales of Investment Real Estate, Adjustment Gains (Losses) on Sales of Investment Real Estate, Adjustment Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Accumulated depreciation Real Estate Investment Property, Accumulated Depreciation Disposal Group Classification [Axis] Disposal Group Classification [Axis] Leases [Abstract] Leases [Abstract] Real estate acquisitions Payments for Deposits on Real Estate Acquisitions Related Person Transactions Related Party Transactions Disclosure [Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province KENTUCKY KENTUCKY PEO Total Compensation Amount PEO Total Compensation Amount Common shares of beneficial interest, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Total capital expenditures Segment Reporting, Long-Lived Asset, Expenditure for Addition Amount Derivative, Notional Amount Construction supervision fees Construction Supervision Fees Construction Supervision Fees Weighted average common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Number of reporting segments Number of Reportable Segments Trustees Trustees [Member] Trustees Share forfeitures Shares Issued, Value, Share-Based Payment Arrangement, Forfeited Total real estate properties, gross Real Estate Investment Property, at Cost Interest and other income Interest and Other Income Concentration Risk [Table] Concentration Risk [Table] Other comprehensive income (loss): Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Entity Address, City or Town Entity Address, City or Town Fair value Derivative, Fair Value, Net Share-based Compensation Arrangement by Share-based Payment Award Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Medical Office and Life Science Portfolio Medical Office and Life Science Portfolio Segment [Member] Medical Office and Life Science Portfolio Segment SHOP Senior Housing Operating Portfolio Segment [Member] Senior Housing Operating Portfolio [Member] Senior Living (SHOP) Senior Living [Member] Senior Living Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Title and Position [Domain] Title and Position [Domain] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Acquired real estate leases and other intangible assets, net Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Equity method investment distributions Proceeds from Equity Method Investment, Distribution, Return of Capital (Level 2) Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Proceeds from insurance recoveries Proceeds from Insurance Settlement, Investing Activities Loss on modification or early extinguishment of debt Gain (Loss) On Early Extinguishment Of Debt Gain (Loss) On Early Extinguishment Of Debt Other expenses Other Expenses Straight line rental income Increase in straight line rental income Straight Line Rent Subsequent Event Type [Axis] Subsequent Event Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Unrealized gain (loss) on derivative Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Senior Unsecured Notes Senior Unsecured Notes [Member] Senior Unsecured Notes [Member] Schedule of Segment Reporting Information Segment Reporting [Table Text Block] RMR Reit Management And Research [Member] Represents details pertaining to Reit Management and Research LLC, or RMR. Total Property Level And Other Expenses Property Level And Other Expenses Mortgage Notes 6.44 Percent Due July 2043 Mortgage Notes 6.44 Percent Due July 2043 [Member] Mortgage Notes 6.44 Percent Due July 2043 Related Party [Axis] Related and Nonrelated Parties [Axis] Unsecured Debt Unsecured Debt [Member] Other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Senior unsecured notes, 5.625% interest rate, due 2042 Senior Unsecured Notes 5.625 Percent Due 2042 [Member] This element represents the senior unsecured notes that bear an interest rate of 5.625 percent due 2042. Tutera Senior Living Tutera Senior Living Manager [Member] Tutera Senior Living Manager Reconciliation of segment income (loss): Segment Reporting, Reconciliation [Abstract] Senior unsecured notes, net Long-Term Debt Per Common Share Amounts, Basic and Diluted [Abstract] Per Common Share Amounts, Basic and Diluted [Abstract] Per Common Share Amounts, Basic and Diluted Reimbursement revenue lease Reimbursement Revenue Lease Reimbursement Revenue Lease Document Period End Date Document Period End Date Change in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash (used in) provided by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Number of properties secured Number of Real Estate Properties Collateralized Represents the number of real estate properties serving as a collateral for debt, as of the balance sheet date. Debt face amount Debt Instrument, Face Amount Loss (gain) on sale of real estate Gain on sale of real estate Gain (Loss) on Sale of Properties Shareholders' Equity Equity [Text Block] Expenses: Costs and Expenses [Abstract] Security Exchange Name Security Exchange Name Real estate improvements accrued, not paid Construction in Progress Expenditures Incurred but Not yet Paid Leases Lessor, Operating Leases [Text Block] Cumulative other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Business and Property Management Agreements with RMR Business And Property Management Agreements [Text Block] Business And Property Management Agreements Weighted Average Common Shares Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Secured Revolving Credit Facility Due 2029 Secured Revolving Credit Facility Due 2029 [Member] Secured Revolving Credit Facility Due 2029 Total liabilities Liabilities Trading Symbol Trading Symbol Discount Rate Measurement Input, Discount Rate [Member] Number joint venture arrangements Number Joint Venture Arrangements Number Joint Venture Arrangements Geographical [Domain] Geographical [Domain] Schedule of Interest Rate Agreement Schedule of Interest Rate Derivatives [Table Text Block] 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] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Utilities Utilities Operating Expense Company Selected Measure Name Company Selected Measure Name Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Net amortization of debt discounts, premiums and issuance costs Amortization of Debt Issuance Costs and Discounts NON-CASH INVESTING ACTIVITIES: Noncash Investing Activities [Abstract] Represents the information pertaining to the Non cash investing activities. Phoenix Senior Living Phoenix Senior Living Manager [Member] Phoenix Senior Living Manager Pursuant to business management agreement: Pursuant To Business Management Agreement [Abstract] Pursuant To Business Management Agreement Net leverage ratio Debt Instrument, Net Leverage Ratio Debt Instrument, Net Leverage Ratio Fair value measurement, number of debt securities Fair Value Measurement, Number Of Debt Securities Fair Value Measurement, Number Of Debt Securities Asset Class [Domain] Asset Class [Domain] Related Party Transactions [Abstract] Related Party Transactions [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted average common shares outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related person transactions Related Party Transaction [Line Items] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Derivatives and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] 6.25% Senior Notes due 2046 Senior Notes Due 2046 [Member] Senior Notes Due 2046 [Member] Entities [Table] Entities [Table] Schedule of Disposal Groups Disposal Groups, Including Discontinued Operations [Table Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Sales Price Real Estate Aggregate Sales Price This element represents the aggregate sales price excluding closing costs, of real estate properties sold by the entity. Schedule of the Change in Fair Value of the Investment in the Unconsolidated Joint Venture Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Award Timing Predetermined Award Timing Predetermined [Flag] Real estate improvements Payments for Capital Improvements Property management agreement expense Related Party Transaction, Expenses from Property Management Agreement Transactions with Related Party Expenses recognized during the period resulting from property management transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period. Redemption of senior unsecured notes Repayments of Unsecured Debt Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] (Level 1) Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Weighted average share price (in dollars per share) Stock Repurchased During Period, Weighted Average Price Stock Repurchased During Period, Weighted Average Price Schedule of Large Concentration of Senior Living Communities Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Area of real estate properties (in square feet) Area of Real Estate Property All Executive Categories All Executive Categories [Member] Number of states in which properties are located Number of States in which Entity Operates Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Schedule of Management Fees and Expense Reimbursements Summary Of Business And Property Management Agreement Expenses [Table Text Block] Summary Of Business And Property Management Agreement Expenses Mortgage Notes 6.86 Percent Due June 2034 Mortgage Notes 6.86 Percent Due June 2034 [Member] Mortgage Notes 6.86 Percent Due June 2034 Depreciation and amortization Depreciation Plan Name [Domain] Plan Name [Domain] Holding period Equity Securities, FV-NI, Holding Period Equity Securities, FV-NI, Holding Period Operating lease, right-of-use asset Operating Lease, Right-of-Use Asset Distributions from unconsolidated joint ventures Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Concentration Risk Type [Domain] Concentration Risk Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Segment Reporting Segment Reporting [Text Block] Minimum Minimum [Member] Secured revolving credit facility Long-Term Line of Credit Distributions to shareholders Payments of Ordinary Dividends, Common Stock Repayment of other debt Repayments of Other Debt Expiration Date Trading Arrangement Expiration Date 2030 Long-Term Debt, Maturity, Year Four Secured debt and finance leases, net Secured Debt And Finance Lease Obligations, Net Secured Debt And Finance Lease Obligations, Net Hedging Relationship [Axis] Hedging Relationship [Axis] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Real Estate [Table] Real Estate [Table] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Income Statement Location [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Investments in unconsolidated joint ventures Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures 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] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Other liabilities Other Liabilities Affiliated Entity Affiliated Entity [Member] Distributions Common stock distributions Total Distributions Dividends, Common Stock Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Common shares of beneficial interest, shares authorized (in shares) Common Stock, Shares Authorized Total real estate properties, net Net book value of collateral Real Estate Investment Property, Net Senior Living Community Management Agreements Concentration Risk Disclosure [Text Block] Units Number of Units in Real Estate Property Lease value amortization Amortization Of Lease Value Amortization Of Lease Value Schedule of Carrying Value and Fair Value of the Financial Instruments Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Exercise Price Award Exercise Price CASH FLOWS FROM INVESTING ACTIVITIES: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Segment reporting Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report Business management fees Business Management Fees Business Management Fees 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] Segments [Domain] Segments [Domain] Senior Living Communities Senior Living Community [Member] Represents the information pertaining to senior living properties. Senior apartments are marketed to residents who are generally capable of caring for themselves. Residence is usually restricted on the basis of age. Purpose built properties may have special function rooms, concierge services, high levels of security and assistance call systems for emergency use. Loss before income taxes and equity in net earnings of investees Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest AlerisLife Inc AlerisLife Inc [Member] AlerisLife Inc Indebtedness Debt Disclosure [Text Block] Accrued interest Interest Payable Share forfeitures (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, Forfeited Disposal Group Classification [Domain] Disposal Group Classification [Domain] Unamortized debt issuance costs Unamortized debt issuance costs Debt Issuance Costs, Net Building improvements Building Improvements [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Real Estate and Other Investments Real Estate Disclosure [Text Block] Equity method investment Equity Method Investments Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Equity in earnings of unconsolidated joint ventures Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Measurement Input Type [Domain] Measurement Input Type [Domain] 5.625% Senior Notes due 2042 Senior Notes Due 2042 [Member] Senior Notes Due 2042 [Member] Secured Debts Secured Debt [Member] Real estate taxes Real Estate Tax Expense Total expenses Costs and Expenses Buildings and improvements Buildings and Improvements, Gross Adoption Date Trading Arrangement Adoption Date Property management fees Property Management Fees Property Management Fees Interest rate Debt Instrument, Interest Rate, Stated Percentage Counterparty Name [Domain] Counterparty Name [Domain] Total shareholders' equity Beginning balance Ending balance Equity, Attributable to Parent Total development, redevelopment and other activities Development, Redevelopment, And Other Activities Development, Redevelopment, And Other Activities Disposed of by sale Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Seaport Innovation LLC Seaport Innovation LLC [Member] Seaport Innovation LLC Real Estate [Domain] Real Estate [Domain] ASSETS Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Gross Real Estate Properties Gross Real Estate Properties [Member] Gross Real Estate Properties Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Operating lease, liability Operating Lease, Liability The LSMD Fund REIT LLC The LSMD Fund REIT LLC [Member] The LSMD Fund REIT LLC Property level expenses Professional Fees Insider Trading Policies and Procedures [Line Items] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Diversified Healthcare Trust Diversified Healthcare Trust [Member] Diversified Healthcare Trust Various Various [Member] Various Expense reimbursement: Expense Reimbursement [Abstract] Expense Reimbursement RMR LLC Reit Management And Research L L C [Member] Represents details pertaining to Reit Management and Research LLC, or RMR. Related party transaction, closing cost Related Party Transaction, Closing Cost Related Party Transaction, Closing Cost Joint Venture Joint Venture [Member] Joint Venture [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Central Index Key Entity Central Index Key Additional paid in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] All Other Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Senior living labor and benefits Senior Living Labor and Benefits Expense Senior Living Labor and Benefits Expense 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] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation ABP Trust And Adam D. Portnoy ABP Trust And Adam D Portnoy [Member] ABP Trust And Adam D Portnoy 2026 Long-Term Debt, Maturity, Remainder of Fiscal Year Finance lease purchase option Payments For Finance Lease Purchase Option Payments For Finance Lease Purchase Option Liabilities of properties held for sale Disposal Group, Including Discontinued Operation, Liabilities Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Ownership [Axis] Ownership [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Investment, Name [Axis] Investment, Name [Axis] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate City Area Code City Area Code Incentive management fees Incentive Management Fees Represents the business management fees incurred pursuant to business management agreement with related parties. Cumulative Other Comprehensive (Loss) Income AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Number of properties acquired (property) Number of Real Estate Properties Acquired Number of Real Estate Properties Acquired Fair value disclosure Debt Instrument, Fair Value Disclosure Payments of dividends Payments of Dividends Name Forgone Recovery, Individual Name Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Incentive management fees Management and Incentive Fees Expense Remaining Remaining Managers [Member] Remaining Managers Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Floating Rate Mortgage Note 6.17 Percent Due March 2028 Floating Rate Mortgage Note 6.15 Percent Due March 2028 [Member] Floating Rate Mortgage Note 6.15 Percent Due March 2028 Rental income Rental Income [Member] Rental Income [Member] Statement Summarized financial information of significant tenant Statement [Line Items] Total assets Total assets Assets Entity [Domain] Entity [Domain] Operating Segments Operating Segments [Member] Interest expense (including net amortization of debt discounts, premiums and issuance costs of $2,309, $19,886, $4,638 and $45,973, respectively) Interest expense Interest expense Total amount of interest expense presented in the condensed consolidated statements of comprehensive income (loss) Interest Expense, Nonoperating Other assets Increase (Decrease) in Other Operating Assets PEO PEO [Member] 2028 Long-Term Debt, Maturity, Year Two Total Business Management Fees and Incentive Management Fees, Net Business Management Fees and Incentive Management Fees, Net Measurement Basis [Axis] Measurement Basis [Axis] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Total recurring capital expenditures Recurring Capital Expenditures Recurring Capital Expenditures Cumulative Distributions Cumulative Common Distributions [Member] Represents cumulative distributions to common shareholders. Subsequent Event Type [Domain] Subsequent Event Type [Domain] Cumulative Net Income Retained Earnings [Member] Basic housing and support services Basic Housing And Support Services [Member] Basic Housing And Support Services [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Common shares of beneficial interest, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Net loss per common share - diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Discovery Senior Living Discovery Senior Living Manager [Member] Discovery Senior Living Manager Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Cash Flow Hedging Cash Flow Hedging [Member] Incentive fee expense Incentive Fee Expense Residents fees and services Resident Fees And Services [Member] Resident Fees And Services [Member] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Ownership [Domain] Ownership [Domain] Secured debt and finance leases Secured Debts and Finance Leases [Member] Secured Debts and Finance Leases Adjustments to reconcile net loss to cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] 2029 Long-Term Debt, Maturity, Year Three Related party transaction capitalized amount Related Party Transaction Capitalized Amount Related Party Transaction Capitalized Amount Thereafter Long-Term Debt, Maturity, After Year Four Long-Term Debt, Maturity, After Year Four CASH FLOWS FROM FINANCING ACTIVITIES: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Total residents fees and services Total segment revenues Revenue from Contract with Customer, Excluding Assessed Tax Schedule of Activity Related to our Cash Flow Hedges Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Unused commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Variable lease, payment Variable Lease, Payment Cumulative distributions Cumulative Common Stock Dividends The amount as of the balance sheet date representing cumulative distributions to common shareholders. Contributions to unconsolidated joint ventures Payments to Acquire Interest in Joint Venture Principal balance Secured Debt And Finance Lease Obligations, Gross Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower and amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. Other income Other Income Fair value Derivative Asset Share repurchases Stock Repurchased During Period, Value Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Fair Value Estimate of Fair Value Measurement [Member] Number of unconsolidated joint ventures Number Of Unconsolidated Joint Ventures Number Of Unconsolidated Joint Ventures Deferred leasing costs, net Increase (Decrease) in Deferred Initial Direct Cost, Lease Accrued interest Increase (Decrease) in Interest Payable, Net Total Property Management And Construction Supervision Fees, Net Property Management And Construction Supervision Fees, Net Senior unsecured notes, 6.250% interest rate, due 2046 Senior Unsecured Notes 6.250 Percent Due 2046 [Member] Senior Unsecured Notes 6.25% Due In 2046 Mortgage Notes 6.57 Percent Due June 2030 Mortgage Notes 6.57 Percent Due June 2030 [Member] Mortgage Notes 6.57 Percent Due June 2030 Segment Reporting [Table] Segment Reporting [Table] Rate Derivative, Strike Rate Derivative, Strike Rate Schedule of Required Principal Payments on Outstanding Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Title and Position [Axis] Title and Position [Axis] Equity in unrealized gains of an investee OCI, Equity Method Investment, after Tax Unsecured Debt, Not Guaranteed Unsecured Debt, Not Guaranteed [Member] Unsecured Debt, Not Guaranteed All Trading Arrangements All Trading Arrangements [Member] Schedule of Assets and Liabilities Recurring and Nonrecurring Measured at Fair Value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Schedule of Dividends Declared and Paid Dividends Declared [Table Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Number of consecutive renewal terms of agreement Related Party Transaction, Property Management Agreement, Number of Consecutive Renewal Terms Represents the number of consecutive renewal terms of agreement that the entity has the option to renew. Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Share repurchases (in shares) Number of shares (in shares) Stock Repurchased During Period, Shares 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] Distributions to common shareholders declared (in dollars per share) Distribution per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Payment of accreted interest on senior secured notes Payment of accreted interest on senior secured notes Payments For Accreted Interest On Senior Secured Notes Payments For Accreted Interest On Senior Secured Notes Amount of loss reclassified from cumulative other comprehensive income (loss) into interest expense Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Impairment of assets Impairment of assets Asset, Impairment Loss Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Senior notes Senior Notes Common shares of beneficial interest, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Assets of properties held for sale Asset, Held-for-Sale, Not Part of Disposal Group Entity Information Entity Information [Line Items] Senior Secured Notes Senior Secured Notes [Member] Senior Secured Notes Other operating expenses Other Cost and Expense, Operating Equity Components [Axis] Equity Components [Axis] Related Party Related Party [Member] Product and Service [Domain] Product and Service [Domain] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Charter Senior Living Charter Senior Living Manager [Member] Charter Senior Living Manager Entity Interactive Data Current Entity Interactive Data Current Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] (Loss) gain on sale of real estate Loss on Sale of Real Estate Gains (Losses) on Sales of Investment Real Estate Entity Smaller Reporting Company Entity Small Business Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Unamortized discount Debt Instrument, Unamortized Discount Termination Date Trading Arrangement Termination Date Senior unsecured notes, 4.375% interest rate, due 2031 Senior Unsecured Notes 4.375 Percent Due 2031 [Member] Senior Unsecured Notes 4.375 Percent Due 2031 Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Senior Secured Note Due 2030 Senior secured notes, 7.250% interest rate, due 2030 Senior Secured Notes, 7.250% Coupon Rate, Due 2030 [Member] Senior Secured Notes, 7.250% Coupon Rate, Due 2030 Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Recognized amortization of the liability Transaction Amortization Of Liability Represents the amount of amortization of the liability recorded during the period. MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Senior unsecured notes, 4.750% interest rate, due 2028 Senior Unsecured Notes 4.750 Percent Due 2028 [Member] Senior Unsecured Notes 4.75 Percent Due 2028 [Member] Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Loss on modification or early extinguishment of debt Loss on modification or early extinguishment of debt Gain (Loss) on Extinguishment of Debt Fair Value as of Grant Date Award Grant Date Fair Value Sinceri Senior Living Sinceri Senior Living Manager [Member] Sinceri Senior Living Manager Straight line rental income, excluding properties held-for-sale Straight Line Rent, Excluding Properties Held-for-Sale Straight Line Rent, Excluding Properties Held-for-Sale Mortgage Notes 6.36 Percent Due June 2035 Mortgage Notes 6.36 Percent Due June 2035 [Member] Mortgage Notes 6.36 Percent Due June 2035 Third Party Managers Third Party Managers [Member] Third Party Managers Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Number of properties agreed to transition Number Of Real Estate Properties Agreed To Transition Number Of Real Estate Properties Agreed To Transition Property operating expenses Operating Costs and Expenses Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Early extinguishment of debt settled in cash Payment for Debt Extinguishment or Debt Prepayment Cost Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies Commitments and Contingencies Contract Type [Axis] Contract Type [Axis] Contract Type Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Equity in net earnings of investees Equity in net earnings of investees Equity in net earnings of investees Income (Loss) from Equity Method Investments Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Counterparty Name [Axis] Counterparty Name [Axis] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] All Award Types Award Type [Domain] Pursuant to property management agreement Pursuant To Property Management Agreement [Abstract] Pursuant To Property Management Agreement Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value of Assets and Liabilities Fair Value Disclosures [Text Block] (Level 3) Fair Value, Inputs, Level 3 [Member] Amortization of liability related to property management and construction supervision fees Amortization Of Liability Related To Property Management And Construction Supervision Fees Amortization Of Liability Related To Property Management And Construction Supervision Fees SUPPLEMENTAL CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] Share price (in dollars per share) Share Price Noncontrolling interest, ownership percentage by parent Subsidiary, Ownership Percentage, Noncontrolling Owner PEO Name PEO Name Geographical [Axis] Geographical [Axis] Restricted cash Restricted cash Restricted Cash Income taxes paid Income Tax Paid, before Refund Received Other segment items Segment Reporting, Other Segment Item, Amount Redemption of senior secured notes Repayments of Secured Debt Other assets, net Other Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Contract Type [Domain] Contract Type [Domain] Contract Type Legal Entity [Axis] Legal Entity [Axis] Purchase of interest rate cap Payments for (Proceeds from) Derivative Instrument, Investing Activities Cash and cash equivalents and restricted cash at beginning of period Cash and cash equivalents and restricted cash at end of period Total cash and cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] 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] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Equity method investment ownership percentage Equity Method Investment, Ownership Percentage Land Land Investment, Name [Domain] Investment, Name [Domain] 2027 Long-Term Debt, Maturity, Year One Net loss per common share - basic (in dollars per share) Earnings Per Share, Basic Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Measurement Input Type [Axis] Measurement Input Type [Axis] Repurchase of common shares Payments for Repurchase of Common Stock Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Capital Expenditure Type [Axis] Capital Expenditure Type [Axis] Capital Expenditure Type Award Type Award Type [Axis] Amount of gain (loss) recognized on derivative in other comprehensive income (loss) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Payment of debt issuance costs Payments of Financing Costs Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Share grants Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture Cumulative net income Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Five Star Five Star Senior Living [Member] Five Star Senior Living 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] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Shares Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Number of states Number Of States Number Of States Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Common shares awarded (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Cover [Abstract] Cover [Abstract] Derivative Contract [Domain] Derivative Contract [Domain] % of Gross Real Estate Properties Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Schedule of Capital Expenditures Schedule Of Capital Expenditures [Table Text Block] Schedule Of Capital Expenditures Equity Awards Adjustments Equity Awards Adjustments [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Total liabilities and shareholders' equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Contributions to unconsolidated joint ventures Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Financial Leases 7.70 Percent Due April 2026 Financial Leases Due April 2026 [Member] Financial Leases Due April 2026 Segments [Axis] Segments [Axis] Other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Plan Name [Axis] Plan Name [Axis] Related Party [Domain] Related and Nonrelated Parties [Domain] Tabular List, Table Tabular List [Table Text Block] Number of communities managed Number Of Communities Managed Number Of Communities Managed Name Awards Close in Time to MNPI Disclosures, Individual Name Shareholders' equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] 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] Lease related costs Lease Related Costs [Member] Lease Related Costs General and administrative General and administrative General and Administrative Expense Number of trustees Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Trustees Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Trustees Exit Capitalization Rates Measurement Input, Exit Capitalization Rates [Member] Measurement Input, Exit Capitalization Rates Adjustment to Compensation: Adjustment to Compensation [Axis] Number of properties owned (property) Properties Number of Real Estate Properties Real estate properties: Real Estate Investment Property, Net [Abstract] Hedging Designation [Domain] Hedging Designation [Domain] Schedule of Secured and Other Debt Schedule of Secured and Other Debt [Table Text Block] Tabular disclosure of information pertaining to secured and other debt obligations of the entity. The disclosure may include different types of debt instruments, carrying value of each debt instrument as of the balance sheet date, interest rate applicable to each instrument and maturity dates of instruments. Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Equity interest in each collateral guarantee Debt Instrument, Percentage Of Equity Interest As Collateral Guarantee Debt Instrument, Percentage Of Equity Interest As Collateral Guarantee Hedging Designation [Axis] Hedging Designation [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Share Award Plans Share Award Plans [Member] Share Award Plans Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other non-cash adjustments, net Other Noncash Income (Expense) Indebtedness Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Insurance General Insurance Expense Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Share grants (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures ABP Trust ABP Trust [Member] ABP Trust Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Unconsolidated joint venture distributions Proceeds from Equity Method Investment, Distribution Private pay and other third party payer skilled nursing facility services Private Pay And Other Third Party Payer Services [Member] Private Pay And Other Third Party Payer Services [Member] Depreciation and amortization Depreciation, Depletion and Amortization Number of operators Number Of Operators Number Of Operators Number of employees Entity Number of Employees Measurement input Equity Securities, FV-NI, Measurement Input Real Estate [Abstract] Real Estate [Abstract] Interest Rate Cap Interest Rate Cap [Member] Proceeds from sale of real estate, net Proceeds from Sale, Real Estate, Held-for-Investment Gain on insurance recoveries Gain on insurance recoveries Insurance Recoveries Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Income tax expense Income tax expense (benefit) Income Tax Expense (Benefit) Mortgage Notes 6.22 Percent Due May 2035 Mortgage Notes 6.22 Percent Due May 2035 [Member] Mortgage Notes 6.22 Percent Due May 2035 Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Manager Concentration Risk Manager Concentration Risk [Member] Manager Concentration Risk Award Timing Method Award Timing Method [Text Block] Increase (decrease) in cash and cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Medicare and Medicaid programs Medicare And Medicaid Programs [Member] Medicare And Medicaid Programs [Member] Extension term Debt Instrument, Extension Option Term Debt Instrument, Extension Option Term Recent Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Net loss Net loss Net loss Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Corporate Joint Venture Corporate Joint Venture [Member] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Capital Expenditure Type [Domain] Capital Expenditure Type [Domain] Capital Expenditure Type Proceeds from mortgage notes payable Proceeds from Notes Payable Dietary Dietary Expense Dietary Expense Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative basis spread on variable rate Derivative, Basis Spread on Variable Rate Revenues: Revenues [Abstract] Investments in affiliates, fair value Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract]