Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Interest rate (as percent) Financing Receivable, Interest Rate Financing Receivable, Interest Rate Expected sale proceeds Proceeds from Sale, Property, Held-for-Sale Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File Number Capital in Excess of Par Value Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Expansion projects Expansion Projects Expansion Projects Summary of Carrying Amounts and Estimated Fair Values of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Debt assumed Loans Assumed Goodwill [Line Items] Goodwill [Line Items] Summary of Real Property Investment Activity by Segment Estimated Fair Value Of Allocated Purchase Price Of Asset And Liabilities [Table Text Block] Estimated Fair Value of Allocated Purchase Price of Asset and Liabilities. Measurement Basis [Axis] Measurement Basis [Axis] Other expenses Other Expenses Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] OCI Other Comprehensive Income (Loss) [Member] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Seniors Housing Operating Seniors Housing Operating [Member] Seniors Housing Operating. Adjustment to Compensation, Amount Adjustment to Compensation Amount Percent of NOI Percentage Concentration Risk, Percentage Amica Senior Lifestyles Acquisition Amica Senior Lifestyles Acquisition [Member] Amica Senior Lifestyles Acquisition Decrease (increase) in receivables and other assets   Increase (Decrease) in Other Operating Assets Stock-based compensation expense   Share-Based Payment Arrangement, Noncash Expense Derivative asset Derivative Asset, Notional Amount Stock options Share-Based Payment Arrangement, Option [Member] Credit Facility, Tranche Due July 2029 Credit Facility, Tranche Due July 2029 [Member] Credit Facility, Tranche Due July 2029 Real estate loans receivable, net of credit allowance   Real estate loans receivable, net of credit allowance Financing Receivable, after Allowance for Credit Loss Common stock dividends paid Dividends, Common Stock, Cash Impairment of assets Impairment of assets   Asset Impairment Charges Total Welltower Inc. stockholders’ equity   Equity, Attributable to Parent Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Authorized shares (in shares) Common Stock, Shares Authorized Summary of Supplemental Balance Sheet Information Related to Leases Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Financial assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Liabilities and equity   Liabilities and equity: Liabilities and Equity [Abstract] Construction in progress Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Construction In Progress Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Construction In Progress Cover [Abstract] Cover [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Dispositions, Real Property Held for Sale and Impairment Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Maximum Maximum [Member] Real estate investments:   Real Estate Investment Property, Net [Abstract] Less: Net income (loss) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Carrying values of properties securing the debt Debt Instrument, Collateral Amount Private Funds Management Business Private Funds Management Business [Member] Private Funds Management Business Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] 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] Credit Concentration Concentration Risk Disclosure [Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Entity Shell Company Entity Shell Company Common Stock, $1.00 par value: Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract] Summary of Geographic Information Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Proceeds from sales of real property   Cash proceeds from real estate dispositions Proceeds from Sale of Property, Plant, and Equipment Debt issued Proceeds from Issuance of Debt Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Real estate Operating Segments Operating Segments [Member] Less: Total comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Additional financing to complete construction Additional Financing to Complete Construction Additional financing to complete construction. Line of Credit Facility [Table] Line of Credit Facility [Table] Distributions to noncontrolling interests Payments to Noncontrolling Interests Collective loan pool Collective Loan Pool 1 [Member] Collective Loan Pool 1 [Member] Share-Based Payment Arrangement, Expensed and Capitalized, Amount Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Total cash invested in real property, net of cash acquired Business Acquisition Purchase Price Allocation Net Cash Invested Business Acquisition Purchase Price Allocation Net Cash Invested Management fees Management Fee Expense Interest on lease liabilities Finance Lease, Interest Expense Non-cash acquisition related activity Business Acquisition, Purchase Price Allocation, Non-Cash Business Acquisition, Purchase Price Allocation, Non-Cash Document Fiscal Period Focus Document Fiscal Period Focus Property taxes Real Estate Tax Expense Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Award Timing Method Award Timing Method [Text Block] Income (loss) from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Award Type Award Type [Axis] Foreign currency translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Rental income related to (above)/below market tenant leases, net Rental Income Related to Above Below Market Tenant Leases Rental income related to above/below market tenant leases, net OP units and DownREIT Units (in shares) Incremental Common Shares Attributable To Redeemable Units Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of operating partnership units. Summary of Business Combination, Pro Forma Information Business Combination, Pro Forma Information [Table Text Block] Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol Accrued expenses and other liabilities   Accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Gain (loss) on real estate dispositions and acquisitions of controlling interests, net Loss (gain) on real estate dispositions and acquisitions of controlling interests, net   (Loss) gain (loss) on real estate dispositions and acquisitions of controlling interests, net Gain (Loss) on Disposition of Real Estate and Asset Acquisitions, Net Gain (Loss) on Disposition of Real Estate and Asset Acquisitions, Net Entity Address, City or Town Entity Address, City or Town Net Proceeds Proceeds from Issuance or Sale of Equity [Abstract] Summary of Real Estate Loans Receivable Summary Of Real Estate Loans Receivable [Table Text Block] Summary Of Real Estate Loans Receivable [Table Text Block] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Effect of foreign currency translation on cash and cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Guarantee of 4.800% Notes due 2028 issued by Welltower OP LLC Guarantee Notes Due 2028 4.800% [Member] Guarantee Notes Due 2028 4.800% Restricted stock units Restricted Stock Units (RSUs) [Member] Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Business combination, consideration transferred Business Combination, Consideration Transferred Entity Emerging Growth Company Entity Emerging Growth Company 2029 Long-Term Debt, Maturity, Year Three Gross repayments Repayments of Lines of Credit 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] Credit Facility, Tranche Due March 2030 Credit Facility, Tranche Due March 2030 [Member] Credit Facility, Tranche Due March 2030 Loss (gain) on derivatives and financial instruments, net Loss (gain) on derivatives and financial instruments, net   Gain (loss) on derivative instruments hedges recognized in income Derivative, Gain (Loss) on Derivative, Net In place lease intangibles Leases, Acquired-in-Place [Member] Outstanding shares (in shares) Common Stock, Shares, Outstanding Loans Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Derivative, loss on derivative Derivative, Loss on Derivative Lease liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities, Assumed Lease Liability Business Combination, Recognized Identifiable Assets Acquired And Liabilities, Assumed Lease Liability Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] 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] Additional fund obligated related to investments Expected additional funding for investments Expected Additional Payments To Develop Real Estate Assets Expected Additional Payments To Develop Real Estate Assets Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Total Proceeds from Issuance or Sale of Equity Real estate property Disposal Group, Including Discontinued Operation, Real Estate Property Disposal Group, Including Discontinued Operation, Real Estate Property Effective rate (in 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 (expense) benefit Income tax (expense) benefit Income Tax Expense (Benefit) Investment in loans receivable Advances on loans receivable Payments to Acquire Loans Receivable Interest rate margin (in percent) Debt Instrument, Basis Spread on Variable Rate Total other assets   Other Assets Document Information [Line Items] Document Information [Line Items] Issued shares (in shares) Preferred Stock, Shares Issued Senior unsecured notes   Senior unsecured notes   Unsecured Debt Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Acquisition measurement period adjustments Goodwill, Acquired During Period Option exercises Proceeds from Stock Options Exercised 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] Redemption price, percentage (in percent) Debt Instrument, Redemption Price, Percentage Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Other real estate loans Other Real Estate Loans Receivables [Member] Other Real Estate Loans Receivables. Shares Issued Stock Issued During Period Shares New Issues [Abstract] Stock Issued During Period Shares New Issues [Abstract] Number of sales-type leases Disposal Group, Number Of Sales-Type Leases Disposal Group, Number Of Sales-Type Leases Net cash provided from (used in) operating activities   Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Debt instrument, term (in days) Debt Instrument, Term Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Subsequent event Subsequent Event [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] 2 Properties Disposed 2 Properties Disposed [Member] 2 Properties Disposed Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Non-real estate loans receivable Non Real-Estate Loans Receivables [Member] Non Real-Estate Loans Receivables [Member] Number of properties transitioned Disposal Group, Including Discontinued Operations, Number of Properties Transitioned Disposal Group, Including Discontinued Operations, Number of Properties Transitioned Buildings and improvements Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment, Building Equity Components [Axis] Equity Components [Axis] Senior Unsecured Notes and Secured Debt Textual Senior Unsecured Notes And Secured Debt (Textual) [Abstract] Senior Unsecured Notes And Secured Debt (Textual) Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Secured debt   Secured Debt, Other Number of reportable segments Number of Reportable Segments Unamortized discounts and premiums, net Debt Instrument, Unamortized Discount (Premium), Net Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Entity Address, State or Province Entity Address, State or Province Numerator for diluted earnings per share Undistributed Earnings (Loss) Available to Common Shareholders, Diluted Loans receivable, fair value Loans Receivable, Fair Value Disclosure Individual: Individual [Axis] Common stock Payments of Ordinary Dividends, Common Stock Cumulative dividends   Cumulative Dividends Other amortization expenses   Amortization Receivables and other assets Business Acquisition Purchase Price Allocation Receivables and Other Assets Business acquisition purchase price allocation receivables and other assets. Deteriorated loans Deteriorated Loans [Member] Deteriorated Loans [Member] Available in alternate currencies Available In Alternate Currencies Amount available to borrow for line of credit arrangement in currencies other than USD. Contributions by noncontrolling interests Proceeds from Noncontrolling Interests Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Total development projects Development Projects Placed Into Service Development projects placed into service. Depreciation and amortization   Other Depreciation and Amortization Ownership interest (in percent) Subsidiary, Ownership Percentage, Noncontrolling Owner Entity Interactive Data Current Entity Interactive Data Current Secured debt Asset Acquisition, Liability, Secured Debt Asset Acquisition, Liability, Secured Debt Real property held for sale Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Real Estate Held For Sale Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Real Estate Held For Sale Principal payments Debt Instrument, Periodic Payment, Principal Option exercises (in dollars per share) Stock Issued During Period, Average Price Per Share, Stock Options Exercised Stock issued during period average price stock options exercised. Ownership [Domain] Ownership [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Asset acquisition debt assumed Asset Acquisition, Debt Assumed Asset Acquisition, Debt Assumed Conversion price (in dollars per share) Debt Instrument, Convertible, Conversion Price Net book value Below Market Lease, Net Summary of Annual Principal Payments Due on Debt Obligations Schedule of Maturities of Long-Term Debt [Table Text Block] Total revenues Total revenues Amount Revenues 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 Unvested restricted shares and units (in shares) Incremental Common Shares Attributable To Dilutive Effect Of Non Vested Restricted Shares Incremental Common Shares Attributable To Dilutive Effect Of Non Vested Restricted Shares Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Lease term extension period (in years) Lessee, Lease, Renewal Term Lessee, Lease, Renewal Term Consideration Disposal Group, Including Discontinued Operation, Consideration Fair value adjustments and other, net Debt Instruments, Fair Value Adjustments, Net Debt Instruments, Fair Value Adjustments, Net Preferred Stock, $1.00 par value: Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract] Loan Carrying Value Financing Receivable, before Allowance for Credit Loss Gross acquired lease intangibles Finite-Lived Intangible Assets, Gross 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] Summary of stockholder's equity capital accounts Class of Stock Disclosures [Abstract] Entity Address, Address Line One Entity Address, Address Line One Accumulated Other Comprehensive Income (Loss) Total accumulated other comprehensive income (loss) AOCI Attributable to Parent [Member] Income (loss) from real estate dispositions, net Disposal Group, Including Discontinued Operation, Operating Income (Loss) Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Ownership [Axis] Ownership [Axis] Derivative Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Summary of Stockholders' Equity Capital Accounts Schedule of Stock by Class [Table Text Block] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Percentage total investments with top five customers (in percent) Percentage Investments With Top Five Customers Percentage investments with top five customers. Held for sale Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] Compensation Labor and Related Expense Summary of Principal Activity Schedule of Long-Term Debt Instruments [Table Text Block] Employee stock options (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Title and Position [Domain] Title and Position [Domain] Total expenses Costs and Expenses At The Market Program At The Market Program [Member] At The Market Program Document Quarterly Report Document Quarterly Report Foreign currency forward contracts, interest rate swaps and cross currency swaps Foreign Currency Contract, Asset, Fair Value Disclosure Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Finance lease, liability, statement of financial position [extensible list] 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 Accrued expenses and other liabilities Business Acquisition Purchase Price Allocation Accrued Expenses and Other Liabilities Business acquisition purchase price allocation accrued expenses and other liabilities. Number of properties, reclassified from sales-type lease to operating lease Number Of Properties, Reclassified From Sales-Type Lease To Operating Lease Number Of Properties, Reclassified From Sales-Type Lease To Operating Lease Non-PEO NEO Non-PEO NEO [Member] Letters of credit outstanding Letters of Credit Outstanding, Amount Summary of accumulated other comprehensive income/(loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Sale of Stock [Axis] Sale of Stock [Axis] Resident fees and services Management Service [Member] Allowance for credit losses on real estate loans receivable Allowance for Credit Loss Balance at beginning of period Balance at end of period Financing Receivable, Allowance for Credit Loss All Award Types Award Type [Domain] Net cash advances (receipts) on loans receivable Payments for (Proceeds from) Loans Receivable Noncontrolling interests   Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Other income Other Income Canada CANADA Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Compensation Amount Outstanding Recovery Compensation Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Real Property Acquisitions and Development Real Estate Disclosure [Text Block] Rental income less than (in excess of) cash received   Straight Line Rent Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Excluding Redeemable Noncontrolling Interest Other Comprehensive Income (Loss), Net of Tax, Excluding Redeemable Noncontrolling Interest MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Avir Health Group Avir Health Group [Member] Avir Health Group Revenues: Revenues: Revenues [Abstract] Non-segment/Corporate Other Non-Segment/Corporate Investments [Member] Other Non-Segment/Corporate Investments Accumulated other comprehensive income (loss)   Accumulated Other Comprehensive Income (Loss), Net of Tax 2027 Long-Term Debt, Maturity, Year One Financial Instruments [Domain] Financial Instruments [Domain] Barchester Barchester Healthcare [Member] Barchester Healthcare Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Number of successive terms Line Of Credit Facility, Number Of Successive Terms Line Of Credit Facility, Number Of Successive Terms Number of loans Financing Receivable, Number Of Loans Financing Receivable, Number Of Loans Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Other assets Disposal Group, Including Discontinued Operation, Other Assets Welltower OP Inc Welltower OP Inc [Member] Welltower OP Inc Executive LTIP Unit Awards Executive LTIP Unit Awards [Member] Executive LTIP Unit Awards Investments in unconsolidated entities Real Estate Investments, Joint Ventures Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Fair Value Measurement [Domain] Fair Value Measurement [Domain] Pro forma net income attributable to common stockholders Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Borrowings Under Credit Facilities and Commercial Paper Program Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Non-cash consideration Non-cash consideration Disposal Group, Including Discontinued Operations, Non-Cash Consideration Disposal Group, Including Discontinued Operations, Non-Cash Consideration Collateral Held [Domain] Collateral Held [Domain] Number of banks in consortium Number of banks in consortium Number of banks in consortium. 2.95% Senior Unsecured Notes Due 2027 2.95% Senior Unsecured Notes Due 2027 [Member] 2.95% Senior Unsecured Notes Due 2027 Goodwill [Roll Forward] Goodwill [Roll Forward] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Diluted (in shares) Denominator for diluted earnings per share - adjusted weighted average shares (in shares) Weighted Average Number of Shares Outstanding, Diluted No. of Loans Financing Receivable Recorded Investment Non Accrual Status Number Of Loans Financing Receivable Recorded Investment Non Accrual Status Number Of Loans Segment Reporting Segment Reporting, Policy [Policy Text Block] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Outstanding shares (in shares) Preferred Stock, Shares Outstanding Equity issued in acquisition Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable Senior Unsecured Notes and Secured Debt Long-Term Debt [Text Block] Document Transition Report Document Transition Report Operating lease, right-of-use asset, statement of financial position [extensible list] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Number of assets acquired Number Of Assets Acquired Number Of Assets Acquired Income Taxes And Distributions Income Tax Disclosure [Text Block] Gross borrowings Proceeds from Lines of Credit Allowance for credit losses on non-real estate loans receivable Accounts Receivable, Allowance for Credit Loss Acquired lease intangibles   Other Finite-Lived Intangible Assets, Gross United Kingdom UNITED KINGDOM Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Net income (loss) Profit Loss Excluding Redeemable Noncontrolling Interest Profit loss excluding redeemable noncontrolling interest. Total equity   Balances at beginning of period Balances at end of period Total accumulated other comprehensive income (loss) Total equity Equity, Including Portion Attributable to Noncontrolling Interest Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Capital in excess of par value   Additional Paid in Capital Product and Service [Axis] Product and Service [Axis] Long-Term Debt, Principal Activity [Roll Forward] Long-Term Debt, Principal Activity [Roll Forward] Long-Term Debt, Principal Activity [Roll Forward] Asset Acquisition [Domain] Asset Acquisition [Domain] Resident fees and services Revenue from Contract with Customer, Excluding Assessed Tax Consideration transferred Asset Acquisition, Consideration Transferred Settlement of loan receivable Business Combination, Consideration Transferred, Settlement of Loan Receivable Business Combination, Consideration Transferred, Settlement of Loan Receivable Statistical Measurement [Axis] Statistical Measurement [Axis] Rental and other revenues related to operating lease payments, variable leases Operating Lease, Variable Lease Income Employee stock purchase program (in shares) Incremental Common Shares Attributable to Dilutive Effect of Employee Stock Purchase Program Incremental Common Shares Attributable to Dilutive Effect of Employee Stock Purchase Program. Mint UK Bidco LLC, Properties Under Development Mint UK Bidco LLC, Properties Under Development [Member] Mint UK Bidco LLC, Properties Under Development Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net income (loss) attributable to common stockholders Numerator for basic earnings per share - net income attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Below market tenant leases Below Market Lease, Gross Summary of Impact of Derivative Instruments on the Consolidated Statements of Comprehensive Income Derivative Instruments, Gain (Loss) [Table Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Unsecured credit facility and commercial paper Balance outstanding at quarter end Long-Term Line of Credit Other assets:   Other Assets [Abstract] 2.8% Senior Unsecured Notes 2.8% Senior Unsecured Notes [Member] 2.8% Senior Unsecured Notes Net income (loss) attributable to common stockholders (in dollars per share) Net income attributable to common stockholders (as reported) (in USD per share) Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Financing lease cost: Finance Lease, Costs [Abstract] Finance Lease, Costs [Abstract] Amount derecognized Transfer of Financial Assets Accounted for as Sales, Amount Derecognized Redemption of OP Units and DownREIT Units Redemption Of OP Units Redemption Of OP Units ATM Program issuances (in shares) Equity and ATM Program Issuance (in shares) Sale of Stock, Number of Shares Issued in Transaction Consolidation Items [Domain] Consolidation Items [Domain] VIE Variable Interest Entity, Not Primary Beneficiary [Member] Investments in Unconsolidated Entities Equity Method Investments and Joint Ventures Disclosure [Text Block] Other liabilities acquired Asset Acquisition, Other Liabilities Asset Acquisition, Other Liabilities Outpatient Medical Outpatient Medical Outpatient Medical [Member] Outpatient Medical. 28 Properties Disposed 28 Properties Disposed [Member] 28 Properties Disposed Reclassification To Sales Type Leases Reclassification To Sales Type Leases [Member] Reclassification To Sales Type Leases Income taxes paid (received), net Income Taxes Paid, Net Redeemable DownREIT Unitholder interests Redeemable OP unitholder interests Redeemable OP Unit holder Interests Total principal balance Beginning balance Ending balance Principal Long-Term Debt, Gross Notes Receivable Notes Receivable [Member] Sunrise Senior Living Sunrise Senior Living [Member] Sunrise Senior Living Expiration Date Trading Arrangement Expiration Date Totals (in shares) Issuance Of Common Stock Shares Issuance of common stock shares. Other Commitments [Domain] Other Commitments [Domain] Increase (decrease) in accrued expenses and other liabilities   Increase (Decrease) in Other Operating Liabilities Lease liabilities Total Lease liabilities Lease, Liability Lease, Liability Equity:   Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Canadian Dominated Unsecured Debt Due 2026 Canadian Dominated Unsecured Debt Due 2026 [Member] Canadian Dominated Unsecured Debt Due 2026 Sales type lease income Sales-type Lease, Lease Income Total dispositions SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Cost of Investment in Real Estate Sold Geographic Concentration Risk Geographic Concentration Risk [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Total construction in progress conversions Construction In Progress Conversions Construction in progress conversions. Amount Payments of Ordinary Dividends [Abstract] Entity Current Reporting Status Entity Current Reporting Status Lease liabilities Disposal Group, Including Discontinued Operation, Operating Lease, Liabilities Disposal Group, Including Discontinued Operation, Operating Lease, Liabilities Receivables [Abstract] Receivables [Abstract] Derivative [Line Items] Derivative [Line Items] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Cash proceeds from real estate dispositions Proceeds from Sale of Property, Plant, and Equipment, Net Of Adjustments Proceeds from Sale of Property, Plant, and Equipment, Net Of Adjustments Real property held for sale, net of accumulated depreciation   Real estate held-for-sale Real Estate, Held-for-Sale Collateral Held [Axis] Collateral Held [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Denominated in Canadian Dollars Canada, Dollars Totals Gross Proceeds From Issuance Or Sale Of Equity Gross Proceeds From Issuance Or Sale Of Equity Comprehensive income: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Average amount outstanding (total of daily principal balances divided by days in period) Line of Credit Facility, Average Outstanding Amount Current Fiscal Year End Date Current Fiscal Year End Date Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Number of available for grant (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Derivative liability Derivative Liability Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Remaining amount authorized to sell Sale Of Stock, Remaining Authorized Amount Sale Of Stock, Remaining Authorized Amount Distributions by unconsolidated entities Proceeds from Equity Method Investment, Distribution Noncontrolling interests Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value 2028 Long-Term Debt, Maturity, Year Two Secured debt Business Acquisition Purchase Price Allocation Secured Debt Business Acquisition Purchase Price Allocation Secured Debt. Other real estate loans receivable Other Real Estate Loans Receivable [Member] Other real estate loans receivable. 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Hedging [Member] Property operating expenses Cost of Sales [Member] Beginning balance Ending balance Goodwill Summary of Components of Lease Expense Lease, Cost [Table Text Block] Exchangeable notes (in shares) Incremental Common Shares Attributable to Dilutive Effect of Exchangeable Notes Incremental Common Shares Attributable to Dilutive Effect of Exchangeable Notes Outpatient Medical Portfolio Disposition Outpatient Medical Portfolio Disposition [Member] Outpatient Medical Portfolio Disposition Allowance for credit losses on real estate loans receivable Real Estate Loan Real Estate Loan [Member] Business Nature of Operations [Text Block] Concentration Risk [Table] Concentration Risk [Table] Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount Foreign currency translation gain (loss) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During 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Location [Domain] Summary of Investments in Unconsolidated Entities Real Estate Investment Financial Statements, Disclosure [Table Text Block] Segment Reporting Segment Reporting Disclosure [Text Block] Goodwill [Table] Goodwill [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Derivative Instruments Not Designated Not Designated as Hedging Instrument [Member] Land and land improvements Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment, Land Other Commitments [Line Items] Other Commitments [Line Items] Other Financial Obligations Other Debt Obligations [Member] 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] General and administrative expenses General and administrative expenses Selling, General and Administrative Expense Payment to acquire assets Payments to Acquire Productive Assets Summary of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Cash disbursed for capital improvements to existing properties Capital improvements to existing properties Payments for Capital Improvements Cumulative Net Income Retained Earnings, Unappropriated [Member] Conversion ratio Debt Instrument, Convertible, Conversion Ratio Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Revolving Credit Facility Revolving Credit Facility [Member] Financing leases Finance Lease, Liability Arrangement Duration Trading Arrangement Duration Amortization related to in-place lease intangibles and lease commissions Depreciation Amortization Related to in Place Lease Intangibles and Lease Commissions Depreciation and amortization related to in place lease intangibles and lease commissions Investments in sales-type leases, net Sales-Type Lease, Net Investment in Lease, after Allowance for Credit Loss Sold or Held for sale Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations [Member] Other segment expenses Other General Expense Segments [Axis] Segments [Axis] Amica Senior Lifestyles Acquisition, Forward Purchase Agreement Amica Senior Lifestyles Acquisition, Forward Purchase Agreement [Member] Amica Senior Lifestyles Acquisition, Forward Purchase Agreement Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Other investments, net of payments   Payment for (Proceeds from) Other Investing Activity Stock Incentive Plans Share-Based Payment Arrangement [Text Block] Sales type lease, number of properties Sales Type Lease, Number of Properties Sales Type Lease, Number of Properties Assets:   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Percentage Investment, Name [Axis] Investment, Name [Axis] Assets: Intangible Assets, Net (Excluding Goodwill) [Abstract] Receivables and other assets   Receivables and other assets Receivables And Other Assets Receivables And Other Assets Non-real estate loans receivable, net of credit allowance Accounts Receivable, after Allowance for Credit Loss Entity Registrant Name Entity Registrant Name Reclassified in next 12 months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] 6 Properties Disposed 6 Properties Disposed [Member] 6 Properties Disposed UK Debt Due 2028 UK Debt Due 2028 [Member] UK Debt Due 2028 Issued in November 20, 2013. 4.25% Senior Unsecured Notes 4.25% Senior Unsecured Notes [Member] 4.25% Senior Unsecured Notes Put-Call Agreements Put-Call Agreements [Member] Put-Call Agreements 2.750% Senior Unsecured Notes Due 2028 2.750% Senior Unsecured Notes Due 2028 [Member] 2.750% Senior Unsecured Notes Due 2028 Seniors Housing Operating Seniors Housing Operating Senior Housing - Operating [Member] Senior Housing - Operating [Member]. 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PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Diluted: Earnings Per Share, Diluted [Abstract] Accordion feature Accordion Feature [Member] An option that gives the right to increase its line of credit or similar type of liability with a lender. Care UK Care UK [Member] Care UK Hedging Designation [Axis] Hedging Designation [Axis] Secured debt Debt Instrument, Fair Value Disclosure 2029 Exchangeable Notes 2029 Exchangeable Notes [Member] 2029 Exchangeable Notes Real estate dispositions Real property dispositions [Abstract] Real property dispositions. Net Investment Hedging Net Investment Hedging [Member] Derivative Contract [Domain] Derivative Contract [Domain] Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Net proceeds from the issuance of common stock   Equity and ATM Program issuances Proceeds from Issuance of Common Stock All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Name Forgone Recovery, Individual Name Option expiration period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Authorized amount to sell Sale Of Stock, Authorized Amount Sale Of Stock, Authorized Amount Seniors Housing Triple-net Acquisition Seniors Housing Triple-net Acquisition [Member] Seniors Housing Triple-net Acquisition Capitalized interest   Interest Paid, Capitalized, Investing Activity 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] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Effect of foreign currency translation Goodwill, Foreign Currency Translation, Gain (Loss) Total comprehensive income Comprehensive Income Excluding Redeemable Noncontrolling Interest Comprehensive Income Excluding Redeemable Noncontrolling Interest. Other liabilities Disposal Group, Including Discontinued Operation, Other Liabilities Summary of Notional Amount of Derivatives and Other Financial Instruments Schedule of Derivative Instruments [Table Text Block] Gain (loss) on real estate dispositions Gain (Loss) on Sale of Properties Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Geographical [Axis] Geographical [Axis] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Mint UK Bidco LLC, Properties Subject to Triple Net Lease Mint UK Bidco LLC, Properties Subject to Triple Net Lease [Member] Mint UK Bidco LLC, Properties Subject to Triple Net Lease Pro forma revenues Business Combination, Pro Forma Information, Pro Forma Revenue Leases Lessor, Operating Leases [Text Block] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Title of 12(b) Security Title of 12(b) Security Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Principal payments due on debt obligations Long-Term Debt, Fiscal Year Maturity [Abstract] Earnings per share: Per Share Earnings Per Share [Abstract] Redemption of OP units and DownREIT units (in shares) Conversion of Stock, Shares Converted Ownership percentage by parent (in percent) Subsidiary, Ownership Percentage, Parent Distributions by unconsolidated entities   Proceeds from Equity Method Investment, Distribution, Return of Capital Construction in progress additions Construction in Process, Additions Construction in Process, Additions Adjustment to members’ interest from change in ownership in Welltower OP Adjustment To Members Interest From Change In Ownership From The OP Adjustment To Members Interest From Change In Ownership From The OP Thereafter Long Term Debt, Maturity, After Year Four Long Term Debt, Maturity, After Year Four Effect of foreign currency Effect of foreign currency Foreign Currency Gain (Loss) On Debt Foreign Currency Gain (Loss) On Debt Effect of dilutive securities: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Collective loan pool Collective Loan Pool 2 [Member] Collective Loan Pool 2 [Member] Award Timing Disclosures [Line Items] Right of use assets: Assets, Lessee [Abstract] Assets, Lessee [Abstract] Real property owned:   Real Estate Investment Property, at Cost [Abstract] Stockholders' Equity Equity [Text Block] Remaining portfolio Remaining Portfolio [Member] Remaining portfolio. Net real property owned   Real Estate Investment Property, Net Principal collected on loans receivable   Less: Receipts on loans receivable Proceeds from Collection of Loans Receivable Vesting period for options (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Summary of Real Estate Loan Activity Summary Of Real Estate Loan Activity [Table Text Block] Summary of real estate loan activity. Authorized shares (in shares) Preferred Stock, Shares Authorized Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Adoption Date Trading Arrangement Adoption Date Collective loan pool Collective Loan Pool 3 [Member] Collective Loan Pool 3 [Member] Amortization related to above (below) market leases, net   Amortization of above and below Market Leases Cash disbursed for acquisitions Payments to Acquire Real Estate Cumulative net income   Retained Earnings (Accumulated Deficit) Chartwell Joint Venture Chartwell Joint Venture [Member] Chartwell Joint Venture 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] Class of Stock [Axis] Class of Stock [Axis] Derivative and financial instruments designated as hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Net proceeds from net investment hedge settlements Payments for (Proceeds from) Hedge, Investing Activities 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] Adjustments to reconcile net income to net cash provided from (used in) operating activities:   Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Financing activities:   Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Revenue Revenue Benchmark [Member] Provision for loan losses, net Financing Receivable, Credit Loss, Expense (Reversal), Net Of Adjustments Financing Receivable, Credit Loss, Expense (Reversal), Net Of Adjustments Sales-Type Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Sales-Type Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Liabilities: Below Market Lease, Net [Abstract] Payments to extinguish senior unsecured notes   Repayments of Unsecured Debt All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Equity and ATM Program issuances (in dollars per share) Sale of Stock, Price Per Share Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Number of common stock authorized for long-term incentive plan (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Properties classified as held for sale Number Of Properties Classified As Held For Sale This represents the number of the properties which are classified as held for sale. Termination Date Trading Arrangement Termination Date Proceeds from hedge Proceeds from Hedge, Investing Activities Mint UK Bidco LLC, Properties Under RIDEA Structure Mint UK Bidco LLC, Properties Under RIDEA Structure [Member] Mint UK Bidco LLC, Properties Under RIDEA Structure Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Summary of Real Property Disposition Activity Disclosure of Long-Lived Assets Held-for-Sale [Table Text Block] Receivable [Domain] Receivable [Domain] Pro forma Business Combination, Acquiree's Revenue since Acquisition Date, Actual Summary of Items Measured at Fair Value on Recurring Basis, Assets Fair Value, Assets Measured on Recurring Basis [Table Text Block] Basic (in shares) Denominator for basic earnings per share - weighted average shares (in shares) Weighted Average Number of Shares Outstanding, Basic Summary of Computation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Repairs and maintenance Cost of Property Repairs and Maintenance Segment Reporting [Abstract] Segment Reporting [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Relieved amount Disposal Group, Including Discontinued Operation, Long Term Debt Disposal Group, Including Discontinued Operation, Long Term Debt Non-real estate loans Accounts Receivable, before Allowance for Credit Loss Fair Value, Separate Account Investment [Line Items] Fair Value, Separate Account Investment [Line Items] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount 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 Consolidated Entities [Axis] Consolidated Entities [Axis] Cash distributions to stockholders   Payments of Dividends Summary of Credit Concentration Fair Value, Concentration of Risk [Table Text Block] Insider Trading Arrangements [Line Items] Foreign currency forward contracts, interest rate swaps and cross currency swaps Foreign currency forward contracts, interest rate swaps and cross currency swaps, net asset (liability) Foreign Currency Contracts, Liability, Fair Value Disclosure Collective loan pool Collective Loan Pool 6 [Member] Collective Loan Pool 6 Triple-net Triple Net [Member] Triple Net [Member]. Unsecured Debt [Line Items] Unsecured Debt [Line Items] Unsecured Debt [Line Items] Total liabilities   Liabilities Currency [Axis] Currency [Axis] Property acquired Asset Acquisition, Number Of Properties Acquired Asset Acquisition, Number Of Properties Acquired Annual facility fee for each bank based on commitment amount Line of Credit Facility, Commitment Fee Percentage Real estate and Corporate Operating Segments And Corporate Non-Segment [Member] Operating Segments And Corporate Non-Segment [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Amica Senior Lifestyles, Unconsolidated Properties Amica Senior Lifestyles, Unconsolidated Properties [Member] Amica Senior Lifestyles, Unconsolidated Properties Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Contributions to unconsolidated entities   Payments to Acquire Interest in Joint Venture Summary of Real Estate Intangibles Excluding Those Related to Ground Lease or Classified as Held For Sale Schedule Of Real Estate Intangibles Excluding Held For Sale [Table Text Block] Schedule of real estate intangibles excluding held for sale. Net proceeds from issuance of common stock Stock Issued During Period, Value, New Issues Fair Value, Separate Account Investment [Table] Fair Value, Separate Account Investment [Table] Unamortized debt issuance costs, net Less: unamortized debt issuance costs Unamortized Debt Issuance Expense Consolidation Items [Axis] Consolidation Items [Axis] Counterparty Name [Axis] Counterparty Name [Axis] Trading days Debt Instrument, Convertible, Threshold Trading Days Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member]