OP units outstanding (in units) Units of Partnership Interest, Amount Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Receivable Type [Axis] Receivable Type [Axis] Outstanding at the end of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Average amount of insurance coverage Tenant Reinsurance Policy Average Amount Of Insurance Coverage Represents the average amount of insurance coverage under the tenant reinsurance policy. Schedule of Investments in Unconsolidated Real Estate Entities Schedule Of Real Estate Investments [Table Text Block] Schedule Of Real Estate Investments [Table Text Block] Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes Amortization of discount Amortization of Debt Discount (Premium) Notes Receivable-Bridge Loans Bridge Loan [Member] Other assets - Cash flow hedge swap agreements Asset derivatives Interest Rate Cash Flow Hedge Asset at Fair Value Real Estate Properties [Line Items] Real Estate Properties [Line Items] Noncontrolling Interest [Table] Noncontrolling Interest [Table] Contract term Revenue From Contract With Customer, Contract Term Revenue From Contract With Customer, Contract Term Tax credits/true-up Effective Income Tax Rate Reconciliation Tax Credits Adjustments Effective income tax rate reconciliation tax credits adjustments. Cash paid for OP Units redeemed Noncontrolling Interest, Operating Partnership Units Redeemed, Cash Paid Noncontrolling Interest, Operating Partnership Units Redeemed, Cash Paid $73.52 - $73.52 Exercise Price Range Four [Member] Exercise Price Range Four [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Liabilities, Noncontrolling Interests and Equity: Liabilities and Equity [Abstract] Non-taxable REIT income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of Stores Equity Method Investment, Number Of Properties Equity Method Investment, Number Of Properties Current development SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Other Addition Amortization of finance lease right-of-use assets Finance Lease, Right-of-Use Asset, Amortization Repurchase of equity portion of 2013 exchangeable senior notes Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt Security Exchange Name Security Exchange Name Lease Arrangement [Domain] Lease Arrangement [Domain] [Domain] for Lease Arrangement [Axis] State deferred taxes Deferred Tax Assets, State Taxes Performance-Based Stock Units Performance Shares [Member] Balance at the beginning of the period (in dollars per share) Balance at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Variable Rate [Domain] Variable Rate [Domain] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Total Finance Lease, Liability, Payment, Due Assets: Assets [Abstract] Investment, Name [Axis] Investment, Name [Axis] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Preferred Operating Partnership Preferred Operating Partnership [Member] Preferred Operating Partnership [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Number of stores classified as held for sale Number Of Operating Stores Held For Sale Number Of Operating Stores Held For Sale Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] ESS Bristol Investments LLC Bristol Investments, LLC [Member] Bristol Investments, LLC [Member] Operating cash outflows for operating lease payments Operating Lease, Payments Interest expense Interest Expense, Excluding Amortization of Debt Discount (Premium) Interest Expense, Excluding Amortization of Debt Discount (Premium) 2023 Long-Term Debt, Maturity, Year Three Fair Value of Financial Instruments [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Earnings and dividends allocated to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] 2021 Lessee, Operating Lease, Liability, to be Paid, Year One Property rental Lease Income Balance at the beginning of the period (in shares) Balance at the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2024 Lessee, Operating Lease, Liability, to be Paid, Year Four Secured notes payable Secured Loan With Bank [Member] Secured Loan With Bank [Member] Real estate under development/redevelopment Real Estate Under Development [Member] Real Estate Under Development [Member] Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Unrecognized compensation cost Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Earnings and dividends allocated to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Commitment to acquire stores, 2021 Commitment To Acquire Retail Space, Expected To Close Next Fiscal Year [Member] Commitment To Acquire Retail Space, Expected To Close Next Fiscal Year [Member] Current expense, state Current State and Local Tax Expense (Benefit) Credit Line 1 First Credit Line [Member] First Credit Line [Member] JCAP Series B Preferred Stock JCAP Series B Preferred Stock [Member] JCAP Series B Preferred Stock Preferred stock, $0.01 par value, 50,000,000 shares authorized, no shares issued or outstanding Preferred Stock, Value, Issued Exercise price range, lower limit (in dollars per share) Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit Lease not yet commenced, term of extension options Lessee, Lease Not Yet Commenced, Renewal Term Lessee, Lease Not Yet Commenced, Renewal Term Weighted average forfeiture rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Forfeiture Rate Represents the estimated weighted average forfeiture rate which is adjusted periodically based on the extent to which actual forfeitures differ, or are expected to differ, from the previous estimates. Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Common stock, par value (dollars per share) Common Stock, Par or Stated Value Per Share Number of properties whereby leases cannot be classified as ground or building leases Number Of Leased Properties That Cannot Be Classified As Ground Or Building Leases Represents the number of properties to which purchase price amounts are allocated, which cannot be classified as ground or building leases and represented as Intangible lease rights. Schedule of Components of Real Estate Assets Schedule Of Real Estate Assets [Table Text Block] Tabular disclosure of the components of real estate assets. It may include gross carrying amount, accumulated depreciation and net carrying amount. Measurement Frequency [Domain] Measurement Frequency [Domain] Series D Units Series D Units [Member] Series D Units [Member] Variable Rate Component [Domain] Variable Rate Component [Domain] [Domain] for Variable Rate Component [Axis] Aggregate offering price Aggregate Offering Price Of Common Share Aggregate offering price of common share. Self storage facilities Self Storage Facility [Member] Self Storage Facility [Member] Expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Statement [Line Items] Statement [Line Items] Amortization period of excess purchase price included in equity earnings Equity Method Investment Excess Purchase Price Amortization Period Represents the period of amortization of the excess purchase price of equity investments over its original basis included in equity earnings. Schedule of Antidilutive Shares Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Class of Stock [Domain] Class of Stock [Domain] State deferred taxes Deferred Tax Liabilities State Taxes Deferred Tax Liabilities State Taxes Amortization period Debt Instrument, Term Number of leases Lessee, Lease, Number Of Leases Lessee, Lease, Number Of Leases Intangible tenant relationships and lease rights Intangible Tenant Relationships And Lease Rights [Member] Intangible Tenant Relationships And Lease Rights [Member Notes payable to Trusts Trust Preferred Securities Subject to Mandatory Redemption [Member] Statement [Table] Statement [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Non-cash lease expense Operating Lease, Right-of-Use Asset, Amortization Expense Intangible lease rights Real Estate Investment Property, Intangible Lease Rights Real Estate Investment Property, Intangible Lease Rights Redemption of Preferred Operating Partnership units for common stock Redemption Of Preferred Operating Partnership Units For Common Stock [Abstract] Redemption Of Preferred Operating Partnership Units For Common Stock Weighted average remaining contractual life Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Remaining Contractual Term [Abstract] Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Remaining Contractual Term [Abstract] Thereafter Lessee, Operating And Finance Lease, Liability, Payments, Due After Year Five Lessee, Operating And Finance Lease, Liability, Payments, Due After Year Five Gain (loss) reclassified from OCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax OP Units redeemed for cash (in shares) Noncontrolling Interest, Operating Partnership Units Redeemed For Cash Noncontrolling Interest, Operating Partnership Units Redeemed For Cash Entity Smaller Reporting Company Entity Small Business Debt securities, term Debt Securities Held To Maturity, Term Debt Securities Held To Maturity, Term Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Common stock sold (in shares) Sale of Stock, Number of Shares Issued in Transaction Notes Payable and Revolving Lines of Credit Exchangeable Senior Notes Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Investment in debt securities Investment in debt securities Payments to Acquire Held-to-maturity Securities Property operations Cost of Revenue Amendment Flag Amendment Flag Interest or penalties related to uncertain tax provisions Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Deferred tax assets: Deferred Tax Assets, Gross [Abstract] Repurchase of equity portion of 2015 exchangeable senior notes Stock Issued During Period, Repurchase Of Equity Portion Of Exchangeable Senior Notes, Value Stock Issued During Period, Repurchase Of Equity Portion Of Exchangeable Senior Notes, Value Shares available for issuance under plans (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Distributions to noncontrolling interests Payments of Ordinary Dividends, Noncontrolling Interest Excess Profit % Unconsolidated Joint Ventures Excess Profit Participation Percentage The percentage of excess profit participation in unconsolidated joint ventures. Measurement Frequency [Axis] Measurement Frequency [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Income allocated to noncontrolling interest - Preferred Operating Partnership Units and Operating Partnership Units Net Income Loss Attributable To Noncontrolling Interest In Operating Partnership Net Income Loss Attributable To Noncontrolling Interest In Operating Partnership Schedule of Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Investments in Unconsolidated Real Estate Entities Equity Method Investments [Policy Text Block] Debt Instrument, Redemption, Period Three Debt Instrument, Redemption, Period Three [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Transfers from construction in progress (to operating facilities) SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Transfers In (Out) SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Transfers In (Out) Note receivable interest rate Financing Receivable, Stated Interest Rate Financing Receivable, Stated Interest Rate Derivative Instruments and Hedging Activities Derivatives, Policy [Policy Text Block] Accounts payable and accrued expenses Capital Expenditures Incurred but Not yet Paid Joint venture one Joint Venture One [Member] Joint Venture One [Member] Investment in unconsolidated real estate entities Amount invested Payments For Investment In Unconsolidated Real Estate Entities Payments For Investment In Unconsolidated Real Estate Entities Management Services Agreements (MSA) Management Services Agreements (MSA) [Member] Management Services Agreements (MSA) [Member] Operating lease, renewal term Lessee, Operating Lease, Renewal Term Changes In Equity And Comprehensive Income Line Items [Line Items] Changes In Equity And Comprehensive Income Line Items [Line Items] Changes In Equity And Comprehensive Income Line Items [Line Items] Holders Of Series A Preferred Operating Partnership Units Holders Of Series A Preferred Operating Partnership Units [Member] Holders Of Series A Preferred Operating Partnership Units [Member] Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] 2022 Lessee, Operating Lease, Liability, to be Paid, Year Two Other Commitments [Line Items] Other Commitments [Line Items] JCAP Series A Preferred Stock JCAP Series A Preferred Stock [Member] JCAP Series A Preferred Stock OP Units redeemed for common stock (in shares) Noncontrolling Interest, Operating Partnership Units Redeemed For Common Stock Noncontrolling Interest, Operating Partnership Units Redeemed For Common Stock Lease Costs Lease, Cost [Table Text Block] 2023 Lessee, Operating Lease, Liability, to be Paid, Year Three SmartStop TRS Deferred Tax Assets, Investment in Subsidiaries Total assets Assets Exercise Price Range [Domain] Exercise Price Range [Domain] Total interest expense recognized Interest Expense, Debt Balance at the beginning of the period (in shares) Balance at the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Common stock and paid-in capital Redemption Of Operating Partnership Units Held By Noncontrolling Interest Including Additional Paid In Capital Redemption Of Operating Partnership Units Held By Noncontrolling Interest Including Additional Paid In Capital Finance Finance Lease, Liability, Payment, Due [Abstract] Other minority owned stores Other Minority Owned Properties [Member] Other Minority Owned Properties [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Leases Lessor, Operating Leases [Text Block] Investments, Debt and Equity Securities [Abstract] Store Lease Store Lease [Member] Store Lease [Member] Property Acquisitions and Dispositions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Options exercisable, weighted average exercise price (in dollars per share) Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price Period used as a denomination to determine the average closing price of common stock Average Closing Market Price Measurement Period Represents the period over which the average market closing price is measured. Total liabilities Liabilities Fixed rate notes payable Long-term Debt, Percentage Bearing Fixed Interest, Amount Volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Present value adjustments Lessee, Operating Lease, Liability, Undiscounted Excess Amount Vested and Expected to Vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Redeemable Noncontrolling Interest Redeemable Noncontrolling Interest [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Real Estate [Abstract] Real Estate [Abstract] Number of acquired stores with land leases Number Of Acquired Stores With Land Leases Number Of Acquired Stores With Land Leases Variable Rate Debt, Weighted Average Interest Rate Number of states in which storage facilities are located Number of States in which Entity Operates Preferred Units by Name [Axis] Preferred Units by Name [Axis] Restricted Stock Grants Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Investment in unconsolidated real estate ventures Investments in Real Estate Ventures Investments In Real Estate Joint Ventures, Net Of Distributions Received Investments In Real Estate Joint Ventures, Net Of Distributions Received Additional Paid-in Capital Additional Paid-in Capital [Member] Other assets, net Other Assets Noncontrolling interests in Operating Partnership, net and other noncontrolling interests Noncontrolling Interest in Operating Partnerships Interest expense related to finance lease liabilities Finance Lease, Interest Expense Principal amount of notes sold Financing Receivable, Sale Fair Value Disclosures Fair Value of Financial Instruments, Policy [Policy Text Block] Redemption of noncontrolling interests Redemption of noncontrolling interests Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Common stock, outstanding (in shares) Common Stock, Shares, Outstanding Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Number of operating ground leases Lessee, Operating Lease, Number Of Leases Lessee, Operating Lease, Number Of Leases Revolving Credit Facility Revolving Credit Facility [Member] VRS Self Storage, LLC VRS Self Storage LLC [Member] VRS Self Storage LLC [Member] Right of use asset - finance lease Finance Lease [Member] Finance Lease [Member] Miscellaneous Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Balance at the beginning of the period (in dollars per share) Balance at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Notes Payable Notes Payable to Banks [Member] Operating and finance lease, original lease term Lessee, Lease, Term Of Contract Lessee, Lease, Term Of Contract Common stock, authorized (in shares) Common Stock, Shares Authorized Net proceeds from exercise of stock options Proceeds from Stock Options Exercised Conversion of Preferred Operating Units to Common Units Conversion Of Preferred Operating Units To Common Units Conversion Of Preferred Operating Units To Common Units Change in deferred expense/(benefit), federal Deferred Federal Income Tax Expense (Benefit) State State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract] Schedule of Financial Information of Business Segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Series A Units Series A Units (Variable Only) Series A Units [Member] Series A Units [Member] Disposal of California Store California Store [Member] California Store [Member] Income Statement [Abstract] Income Statement [Abstract] Accumulated Other Comprehensive Income AOCI Attributable to Parent [Member] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Noncontrolling interests in Operating Partnership Noncontrolling Interest, Decrease From Redemptions Of Operating Partnership Units Noncontrolling Interest, Decrease From Redemptions Of Operating Partnership Units Number of operating stores acquired Number Of Real Estate Properties Acquired By Joint Ventures Number Of Real Estate Properties Acquired By Joint Ventures Tranche 4 Term Loan Facility Tranche 4 Term Loan Facility [Member] Tranche 4 Term Loan Facility [Member] Use of Estimates Use of Estimates, Policy [Policy Text Block] Total Lessee, Operating And Finance Lease, Liability, Payments, Due [Abstract] Lessee, Operating And Finance Lease, Liability, Payments, Due [Abstract] Joint venture preferred equity investment return percentage Preferred Equity In Joint Venture Annual Rate Of Return Preferred Equity In Joint Venture Annual Rate Of Return Bridge loans, extension term Financing Receivable, Extension Term Financing Receivable, Extension Term Consolidated Entities [Axis] Consolidated Entities [Axis] Improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Improvements Average share price (in dollars per share) Average Share Price Per Share Average Share Price Per Share Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units) Income (Loss) Attributable to Noncontrolling Interest Fixed Component Represents the component of income or loss attributable to the noncontrolling interest as a result of fixed distributions paid to Preferred Operating unit holders. Tax credits/true-up, total Income Tax Credits and Adjustments Contribution of Preferred OP Units to unconsolidated real estate venture Distribution of Real Estate from Investments in Unconsolidated Real Estate Ventures [Abstract] Distribution of Real Estate from Investments in Unconsolidated Real Estate Ventures [Abstract] Instruments to be settled in cash (at least) Preferred Operating Partnership Units Amount to be Settled in Cash Minimum Represents the minimum amount of convertible preferred operating partnership units which will be settled in cash upon conversion. Schedule of Nonvested Performance-based Units Activity Schedule of Nonvested Performance-based Units Activity [Table Text Block] Operating lease liabilities Deferred Tax Assets, Operating Lease Liability Deferred Tax Assets, Operating Lease Liability Consolidation Items [Domain] Consolidation Items [Domain] Property Acquisition And Dispositions [Table] Property Acquisitions And Dispositions [Table] Property Acquisitions And Dispositions [Table] Number of extension options Debt Instrument, Number of Extension Periods Debt Instrument, Number of Extension Periods Income before equity in earnings of unconsolidated real estate ventures and income tax expense Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Exchangeable Senior Notes Exchangeable Senior Notes [Member] Exchangeable Senior Notes Lease not yet commenced, term Lessee, Lease Not Yet Commenced, Term Of Contract Lessee, Lease Not Yet Commenced, Term Of Contract Conversion of units, units issued upon conversion (in shares) Noncontrolling Interest, Conversion Of Preferred Units to Common Units, Number Of Units Issued Noncontrolling Interest, Conversion Of Preferred Units to Common Units, Number Of Units Issued Other Assets Other Assets Policy [Policy Text Block] Disclosure of accounting policy for other noncurrent assets. Entity [Domain] Entity [Domain] Restricted stock grants issued (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Accrued construction costs and capital expenditures Accrued Construction Costs And Capital Expenditures [Abstract] Accrued Construction Costs And Capital Expenditures [Abstract] Common stock and paid-in capital Redemption Of Operating Partnership Units For Common Stock Including Additional Paid In Capital Represents the value of Operating Partnership units redeemed for common stock including additional paid in capital. Estimated useful life Property, Plant and Equipment, Useful Life Redemption of units for cash Redemption Of Units For Cash [Member] Redemption Of Units For Cash [Member] Corporate facility leases Corporate Facility Lease [Member] Corporate Facility Lease [Member] $85.99 - $85.99 Exercise Price Range Five [Member] Exercise Price Range Five [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Income tax expense, federal Federal Income Tax Expense (Benefit), Continuing Operations Share-based Payment Arrangement, Option, Exercise Price Range [Table] Share-based Payment Arrangement, Option, Exercise Price Range [Table] Restricted cash Restricted Cash and Cash Equivalents Tenant Reinsurance Claims: Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Restricted Stock Restricted Stock [Member] Preferred units outstanding (in shares) Preferred Units, Outstanding Principal amount repurchased Debt Instrument, Repurchased Face Amount Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Joint venture two Joint Venture Two [Member] Joint Venture Two Consolidated Entities [Domain] Consolidated Entities [Domain] Federal Federal Income Tax Expense (Benefit), Continuing Operations [Abstract] Right-of-use assets obtained in exchange for new finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Schedule of Information Relating to Gain (Loss) Recognized on Swap Agreements Derivative Instruments, Gain (Loss) [Table Text Block] Proceeds from principal payments on note receivable collateralized by Preferred OP Units Proceeds From Collection Of Notes Receivable, Financing Activities Proceeds From Collection Of Notes Receivable, Financing Activities Cancelled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Schedule of Weighted Average Assumptions Used to Estimate Fair Value of Awards Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Investments in unconsolidated real estate entities Investment In Unconsolidated Real Estate Entities Investment In Unconsolidated Real Estate Entities Schedule of Balance Sheet Classification and Fair Value of Entity's Derivative Financial Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Gain on real estate transactions Gain on real estate transactions Gain on real estate transactions Gains (Losses) On Real Estate Transactions, Net Of Impairment Of Real Estate Gains (Losses) On Real Estate Transactions, Net Of Impairment Of Real Estate Investment commitment, period Preferred Stock Investment, Investment Commitment, Period Preferred Stock Investment, Investment Commitment, Period Remaining amortization period Finite-Lived Intangible Assets, Remaining Amortization Period Payments for current year claims Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Number of stores added under operating lease Number Of Stores Added Under Operating Lease Number Of Stores Added Under Operating Lease Swap Agreements Swap Agreements Interest Rate Swap [Member] Number of stores acquired at certificate of occupancy Number Of Stores Acquired At Issuance Of Certificate Of Occupancy Number Of Stores Acquired At Issuance Of Certificate Of Occupancy Weighted-Average Grant-Date Fair Value Weighted-Average Grant-Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Lease liabilities Lessee, Operating And Finance Lease, Liability Lessee, Operating And Finance Lease, Liability 2022 Lessee, Operating And Finance Lease, Liability, Payments, Due Year Two Lessee, Operating And Finance Lease, Liability, Payments, Due Year Two Additional paid-in capital Additional Paid in Capital, Common Stock Entity Registrant Name Entity Registrant Name Subsequent Event Type [Domain] Subsequent Event Type [Domain] Weighted average discount rate - operating leases Operating Lease, Weighted Average Discount Rate, Percent Gross operating real estate assets Real Estate Investment Property, at Cost Other liabilities Increase (Decrease) in Other Operating Liabilities PR EXR Self Storage, LLC PR EXR Self Storage, LLC [Member] PR EXR Self Storage, LLC [Member] Unamortized debt issuance costs Related debt issuance costs Related debt issuance costs Debt Issuance Costs, Net Present value adjustments Finance Lease, Liability, Undiscounted Excess Amount Variable Rate Component [Axis] Variable Rate Component [Axis] Variable Rate Component [Axis] Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Real Estate [Domain] Real Estate [Domain] Fixed priority return on preferred OP units, liquidation value Noncontrolling Interest In Preferred Operating Partnership Units Fixed Priority Return Redemption Value Represents the liquidation value of preferred operating partnership units attributable to noncontrolling preferred unit holders on which the fixed priority return is granted. 2021 Lessee, Operating And Finance Lease, Liability, Payments, Year One Lessee, Operating And Finance Lease, Liability, Payments, Year One Number of stores acquired, subject to finance lease Number Of Real Estate Properties Acquired, Subject to Finance Lease Number Of Real Estate Properties Acquired, Subject to Finance Lease Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update [Axis] Number of consolidated joint ventures Real Estate Consolidated Joint Ventures Number Represents the number of consolidated joint ventures as of the balance sheet date. ASU 2016-02 Accounting Standards Update 2016-02 [Member] Issuance of common stock in connection with share based compensation (in shares) Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture Sale of Stock [Axis] Sale of Stock [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Property Acquisitions [Line Items] Property Acquisitions and Dispositions [Line Items] Property Acquisitions and Dispositions [Line Items] Debt Instrument, Redemption, Period Two Debt Instrument, Redemption, Period Two [Member] Percentage of employee's compensation that qualifies for 100 percent matching contribution by the company Maximum Percentage of Compensation By Plan Participants Subject to Hundred Percent Matching of Company Represents the percentage of employee's compensation that qualifies for 100 percent matching contribution by the company. Commitment to acquire stores Commitment To Acquire Retail Space [Member] Commitment To Acquire Retail Space [Member] Annual rate of return percent Noncontrolling Interest In Preferred Operating Partnership Units Annual Rate Of Return Represents the annual rate of return of preferred operating partnership units. Number of claims made Number Of Claims Made Under Tenant Reinsurance Program Represents the number of claims made under tenant reinsurance program during the period. Principal amount of notes issued Debt Instrument, Face Amount Buildings, improvements and other intangibles Building and Building Improvements [Member] Noncash acquisition, finance lease liability, completion of construction Noncash or Part Noncash Acquisition, Finance Lease Liability, Construction Noncash or Part Noncash Acquisition, Finance Lease Liability, Construction Equity [Abstract] Equity [Abstract] Bridge loans, extension option Financing Receivable, Extension Option Financing Receivable, Extension Option Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-maturity [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Preferred Units, Class [Domain] Preferred Units, Class [Domain] Aggregate cost of real estate for U.S. federal income tax purposes SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Federal Income Tax Basis Derivative Contract [Domain] Derivative Contract [Domain] Diluted (in shares) Average number of common shares outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Consideration to be paid on redemption of common OP units Operating Partnership Units Redemption Amount Represents the amount the entity would have paid in cash to redeem the operating partnership units. Storage Portfolio I LLC Storage Portfolio I LLC [Member] Storage Portfolio I LLC [Member] Cancelled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Debt Disclosure [Abstract] Debt Disclosure [Abstract] Accrued liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Schedule of Stock Options Outstanding and Exercisable Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block] Depreciation and amortization Amortization expense Depreciation and amortization expense Other Depreciation and Amortization Unrecognized tax benefits Unrecognized Tax Benefits Convertible Debt Convertible Debt Policy [Policy Text Block] Convertible Debt Policy [Policy Text Block] Common stock, $0.01 par value, 500,000,000 shares authorized, 131,357,961 and 129,534,407 shares issued and outstanding at December 31, 2020 and 2019, respectively Common Stock, Value, Issued Present value adjustments Lessee, Operating And Finance Lease, Liability, Undiscounted Excess Amount Lessee, Operating And Finance Lease, Liability, Undiscounted Excess Amount Document Fiscal Year Focus Document Fiscal Year Focus SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract] Real estate assets, net Noncash Or Part Noncash Acquisition Net Real Estate Assets Acquired Represents the amount of real estate assets that an Entity acquires in a noncash (or part noncash) acquisition. Real estate assets refer to the lands, buildings and intangible assets (including those that are part of operations and those under development) of a real estate entity, net of accumulated depreciation and amortization. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Disposal of Florida Stores Florida Stores [Member] Florida Stores Entity Current Reporting Status Entity Current Reporting Status Credit Line 3 Third Credit Line [Member] Third Credit Line Development and redevelopment of real estate assets Payments to Develop Real Estate Assets Earnings Per Common Share Earnings Per Share, Policy [Policy Text Block] Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Common stock, issued (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Issued Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Eurodollar Eurodollar [Member] Repurchase of exchangeable senior notes with common stock Issuance Of Common Stock For Repayment Of Senior Debt, Value Issuance Of Common Stock For Repayment Of Senior Debt, Value Options outstanding (in shares) Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding 2025 Lessee, Operating And Finance Lease, Liability, Payments, Due Year Five Lessee, Operating And Finance Lease, Liability, Payments, Due Year Five Operating lease liabilities Lease liabilities Operating Lease, Liability Net deferred income tax liabilities Deferred Tax Liabilities, Net Segment Reporting [Abstract] Segment Reporting [Abstract] Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Total Extra Space Storage Inc. stockholders' equity Stockholders' Equity Attributable to Parent Variable interest entity interest in trust number Variable Interest Entity Interest In Trust Number Represents the number of wholly-owned unconsolidated subsidiaries. DESCRIPTION OF BUSINESS Nature of Operations [Text Block] Joint venture preferred equity investment Equity Method Investment, Preferred Equity Interest Equity Method Investment, Preferred Equity Interest Adjustments and Costs to Land and Building Subsequent to Acquisition SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition, Cost Entity Address, City or Town Entity Address, City or Town Notes payable, net Total Notes Payable Additional units redeemed (in shares) Partners Capital Account Additional Units Redeemed The number of additional Preferred Operating Partnership units that can be redeemed without a required repayment of the note payable secured by such Preferred Operating Partnership Units. Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] 2025 Lessee, Operating Lease, Liability, to be Paid, Year Five Other assets Other Assets [Member] Financial Instrument [Axis] Financial Instrument [Axis] Net real estate assets: SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract] Gain/(loss) on repurchase Gain (Loss) on Repurchase of Debt Instrument Type of Adoption [Domain] Accounting Standards Update [Domain] Risk Management and Use of Financial Instruments Risk Management Activities Policy [Policy Text Block] Risk Management Activities Policy [Text Block] Short-term lease cost Short-term Lease, Cost Real Estate Assets and Sales Real Estate, Policy [Policy Text Block] OP Units (in shares) Incremental Common Shares Attributable To Conversion Of Operating Partnership Units Shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible operating partnership units. Interest Rate Line of Credit Facility, Interest Rate at Period End Valuation allowance Deferred Tax Assets, Valuation Allowance Net income allocated to Operating Partnership and other noncontrolling interests Minority Interest In Net Income Loss Operating Partnerships And Other Amount of net income (loss) for the period allocated to noncontrolling partners of an operating partnership and others included in the entity's consolidated financial statements. Real Estate Assets Real Estate Disclosure [Text Block] Shares related to exchangeable senior notes and dilutive stock options (in shares) Incremental Common Shares Attributable To Share Based Payment Arrangements Stock Options Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements related to stock options. Gross carrying amount - Building and improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Building and Improvements, Amount Accumulated depreciation: SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] Investment, Name [Domain] Investment, Name [Domain] Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Leases [Abstract] Leases [Abstract] Regional Office Lease Regional Office Lease [Member] Regional Office Lease [Member] Notes payable subject to recourse Recourse Debt Principal Amount Represents the principal amount of recourse debt due to guarantees at the balance sheet date. Debt securities, extension option Debt Securities Held To Maturity, Extension Option Debt Securities Held To Maturity, Extension Option Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Other Non Controlling Interest Other [Member] Non Controlling Interest Other [Member] Less: comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Schedule of Major Sources of Temporary Differences Stated at their Deferred Tax Effects Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] State and local tax expense - net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent $65.36 - $65.36 Exercise Price Range Two [Member] Exercise Price Range Two [Member] Disposal Group Name [Domain] Disposal Group Name [Domain] Extra Space Storage Inc. stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Aggregate intrinsic value Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Aggregate Intrinsic Value [Abstract] Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Aggregate Intrinsic Value [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Cash distributions in unconsolidated real estate ventures Cash Distributions In Unconsolidated Real Estate Ventures Cash Distributions In Unconsolidated Real Estate Ventures Software development Software Development [Member] increase in right-of-use assets under new operating leases Increase In Operating Lease, Right-Of-Use Assets Increase In Operating Lease, Right-Of-Use Assets Net income for diluted computations Net Income (Loss) Available to Common Stockholders, Diluted Self-Storage Operations Self Storage Operations [Member] Self Storage Operations [Member] Operating lease, term Lessor, Operating Lease, Term of Contract Unit conversion ratio Shareholders' Equity, Units Conversion Ratio Shareholders' Equity, Units Conversion Ratio Redemption price as percentage of principal amount of notes plus accrued and unpaid interest Debt Instrument, Redemption Price, Percentage Entity Filer Category Entity Filer Category Accounts payable and accrued expenses Establishment Of Operating Lease Right Of Use Assets And Lease Liabilities, Increase (Decrease) In Accounts Payable And Accrued Expenses Establishment Of Operating Lease Right Of Use Assets And Lease Liabilities, Increase (Decrease) In Accounts Payable And Accrued Expenses Common Stock Common Stock [Member] Product and Service [Domain] Product and Service [Domain] Matching contributions made by the entity during the period Defined Contribution Plan, Cost Weighted average discount rate - finance leases Finance Lease, Weighted Average Discount Rate, Percent Fixed rate notes receivable Notes Receivable, Fair Value Disclosure Other Commitments [Axis] Other Commitments [Axis] Lease Contractual Term [Axis] Lease Contractual Term [Axis] Maximum percentage of the company's matching contributions of next 2 percent of employee's compensation Maximum Percentage of Matching Contribution Made By Company For Next Two Percent of Participants Compensation Represents the percentage of the company's matching contributions of next 2 percent of employee's compensation. Investments in Debt Securities and Notes Receivable Investments In Debt Securities And Financing Receivables [Text Block] Investments In Debt Securities And Financing Receivables Revenue and Expense Recognition Revenue And Expense Recognition Policy [Policy Text Block] Revenue And Expense Recognition Policy [Text Block] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Fixed interest rate Fixed Rate Debt Instrument, Interest Rate, Stated Percentage Finance lease liability Lease Obligation Incurred Land Initial Cost SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Land Total Real Estate Assets Acquired Real Estate Property Asset Acquisition, Consideration Transferred Real Estate Property Asset Acquisition, Consideration Transferred Performance component weight percentage Share-based Compensation Arrangement By Share-based Payment Award, Component Weight, Percentage Share-based Compensation Arrangement By Share-based Payment Award, Component Weight, Percentage Preferred OP units conversion ratio (in units) Noncontrolling Interest In Preferred Operating Partnership Units Conversion Ratio Represents the ratio for conversion of preferred operating partnership units into common OP units. Supplemental schedule of noncash investing and financing activities: Noncash Investing and Financing Items [Abstract] Issuance of common stock upon the exercise of options (in shares) Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Net increase (decrease) in cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Options Share-based Payment Arrangement, Option [Member] Expenses: Costs and Expenses [Abstract] Establishment of operating lease right of use assets and lease liabilities Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net [Abstract] Sale of Stock [Domain] Sale of Stock [Domain] Change in deferred expense/(benefit), state Deferred State and Local Income Tax Expense (Benefit) 2025 Long-Term Debt, Maturity, Year Five Ownership [Domain] Ownership [Domain] Number of stores owned and/or managed Number Of Real Estate Properties Owned And Or Managed The number of real estate properties owned and/or managed as of the balance sheet date. Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Derivatives with contingent features, net liability position Derivative With Contingent Features, Fair Value Of Asset (Liability), Net Derivative With Contingent Features, Fair Value Of Asset (Liability), Net Total noncontrolling interests and equity Beginning balance Ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total revenues Revenues Revenues Claims and claim adjustment expense for claims incurred in the current year Current Year Claims and Claims Adjustment Expense Class of Stock [Axis] Class of Stock [Axis] Schedule Summarizing Terms of Entity's Derivative Financial Instruments Schedule of Derivative Instruments [Table Text Block] Income taxes paid Income Taxes Paid, Net Extra Space Northern Properties Six LLC Extra Space Northern Properties Six LLC [Member] Extra Space Northern Properties Six LLC [Member] New Accounting Pronouncements or Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Employee contribution to retirement saving plan as a percentage of annual salary, maximum Maximum Percentage of Annual Salary Which Plan Participants May Contribute to the Plan The maximum percentage of annual salary contributions made by plan participants in retirement saving plan. WCOT Self Storage LLC WCOT Self Storage LLC [Member] WCOT Self Storage LLC [Member] Diluted (in dollars per share) Earnings Per Share, Diluted Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Investment balance Investment In Unconsolidated Real Estate Entities, Net Of Distributions Investment In Unconsolidated Real Estate Entities, Net Of Distributions Debt SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Amount of Encumbrances 2013 Notes Exchangeable Senior Notes Two Point Three Seven Five Percent Due Two Thousand Thirty Three [Member] Exchangeable Senior Notes Two Point Three Seven Five Percent Due Two Thousand Thirty Three [Member] Number of Stores Number of owned stores Number Of Operating Stores Owned Number Of Operating Stores Owned Value of Operating Partnership units issued Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Schedule of Components of Notes Payable Schedule of Long-term Debt Instruments [Table Text Block] Entity Address, Address Line One Entity Address, Address Line One Percentage of employee's compensation that qualifies for 50 percent matching contribution by the company Maximum Percentage of Compensation By Plan Participants Subject to Fifty Percent Matching of Company Represents the percentage of employee's compensation that qualifies for 50 percent matching contribution by company. Notes receivable from Preferred and Common Operating Partnership unit holders Due From Related Parties Fair Value Disclosure Fair value of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due after one year (or one business cycle). Issuance of common stock in connection with share based compensation Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture Entity Emerging Growth Company Entity Emerging Growth Company Notes exchange, threshold consecutive trading days Debt Instrument, Convertible, Threshold Consecutive Trading Days Change in deferred expense/(benefit), total Deferred Income Tax Expense (Benefit) Acquisitions SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Acquisitions SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Acquisitions Fixed liquidation value Noncontrolling Interest In Preferred Operating Partnership Units Fixed Liquidation Value Represents the fixed liquidation value of preferred operating partnership units. Investment redemption restriction period Preferred Stock Investment, Redemption Restriction Period Preferred Stock Investment, Redemption Restriction Period Intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Intangible assets - tenant relationships Real Estate Investment Property, Intangible Tenant Relationships Real Estate Investment Property, Intangible Tenant Relationships Maximum Maximum [Member] Federal funds rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Stock compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Number of store acquisitions expected to close Number Of Store Acquisitions Expected To Close The number of stores that are under contract as of balance sheet date for which the entity expects the acquisitions to close by the end of the annual reporting period. Gross carrying amount - Total Balance at beginning of year Balance at end of year SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross Total provision Effective Income Tax Rate Reconciliation, Percent 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] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Period after which preferred stock dividend is subject to increase Preferred Stock Investment, Period After Which Dividend Rate Is Subject To Increase Preferred Stock Investment, Period After Which Dividend Rate Is Subject To Increase Unamortized discount - equity component Debt Instrument Unamortized Discount Of Equity Component Represents the amount of debt discount related to equity component that was originally recognized at the issuance of the instrument that has yet to be amortized. Investments [Domain] Investments [Domain] Bridge loans, original maturities Financing Receivable, Term Financing Receivable, Term Derivatives with contingent features, contingent cash settlement value Derivative Instruments With Contingent Features, Contingent Cash Settlement Value Derivative Instruments With Contingent Features, Contingent Cash Settlement Value Trading Symbol Trading Symbol Shares repurchased, average price (in dollars per share) Stock Repurchased During Period, Average Price Stock Repurchased During Period, Average Price Weighted average number of shares Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Lease Option [Domain] Lease Option [Domain] [Domain] for Lease Option [Axis] Series A Units (in shares) Incremental Common Shares Attributable to Exchangeable Preferred Operating Partnership Units Shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of exchangeable preferred operating partnership units. OP Units issued upon redemption of Series C Units (in shares) Increase In Noncontrolling Interest Units, Conversion Of Preferred Units Increase In Noncontrolling Interest Units, Conversion Of Preferred Units Extension term Line Of Credit Facility, Extension Term Line Of Credit Facility, Extension Term Schedule of Operating Properties Acquired Schedule of Asset Acquisitions [Table Text Block] Schedule of Asset Acquisitions [Table Text Block] Fixed rate notes payable Notes Payable, Fair Value Disclosure Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of Unpaid Claims Liability Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Investment grade election Specified Investment Grade Rating And Elects To Use Alternative Rates [Member] Specified Investment Grade Rating And Elects To Use Alternative Rates [Member] Equity in earnings and dividend income from unconsolidated real estate entities Equity in earnings and dividend income from unconsolidated real estate entities Income (Loss) And Dividend Income From Unconsolidated Real Estate Entities Income (Loss) And Dividend Income From Unconsolidated Real Estate Entities Entity Shell Company Entity Shell Company Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Series C Units Series C Units [Member] Series C Units [Member] Recurring Fair Value, Recurring [Member] 2022 Finance Lease, Liability, to be Paid, Year Two Real estate assets, net Net real estate assets Real Estate Investment Property, Net Entity Public Float Entity Public Float Acquisition of real estate assets Payments to Acquire Real Estate Document Type Document Type SC SOUTH CAROLINA ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Options granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Unpaid claims liability at beginning of year Unpaid claims liability at the end of the year Liability for Claims and Claims Adjustment Expense Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Segments [Axis] Segments [Axis] Employee Benefit Plan Retirement Benefits [Text Block] Released (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Note receivable interest rate Notes Receivable Stated Interest Rate Represents the stated interest rate of notes receivable. Lease Arrangement [Axis] Lease Arrangement [Axis] Lease Arrangement [Axis] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Buyback of common stock, net of offering costs (in shares) Shares repurchased (in shares) Stock Repurchased During Period, Shares Dispositions and other SEC Schedule, 12-28, Real Estate Companies, Investment In Real Estate, Cost Of Investment In Real Estate, Other Additions (Deductions) SEC Schedule, 12-28, Real Estate Companies, Investment In Real Estate, Cost Of Investment In Real Estate, Other Additions (Deductions) Tax credits/true-up, federal Income Tax Credits and Adjustments Federal A credit or adjustment for government or taxing authority authorized decrease in federal taxes owed as a result of meeting certain tax policy conditions. Line of Credit Line of Credit [Member] RI RHODE ISLAND Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Proceeds from notes payable and revolving lines of credit Proceeds from Issuance of Debt Income from operations Net operating income Operating Income (Loss) Weighted average exercise price (in dollars per share) Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price Noncontrolling Interest Represented By Preferred Operating Partnership Units Noncontrolling Interests In Operating Partnership and Other Noncontrolling Interests Noncontrolling Interest Disclosure [Text Block] Equipment and fixtures Equipment And Fixtures [Member] Equipment And Fixtures [Member] Storage Portfolio II JV LLC Storage Portfolio II JV LLC [Member] Storage Portfolio II JV LLC [Member] Investment in debt securities (in shares) Debt Securities, Held To Maturity, Number Of Shares Debt Securities, Held To Maturity, Number Of Shares Notes payable assumed Loan Assumed Loans assumed Noncash or Part Noncash Acquisition, Debt Assumed Investment commitment Preferred Stock Investment, Investment Commitment Preferred Stock Investment, Investment Commitment Variable Rate [Axis] Variable Rate [Axis] Commitments and contingencies Commitments and Contingencies Repurchase of common stock Shares repurchased, amount paid Payments for Repurchase of Common Stock Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Tranche 1 Term Loan Facility Tranche 1 Term Loan Facility [Member] Tranche 1 Term Loan Facility [Member] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Value of OP Units issued in conjunction with acquisitions Noncontrolling Interest, Operating Partnership Units Issued With Acquisition, Value Noncontrolling Interest, Operating Partnership Units Issued With Acquisition, Value Entity Address, State or Province Entity Address, State or Province Released (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Expected tax at statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Other Commitments [Table] Other Commitments [Table] Accumulated deficit Retained Earnings (Accumulated Deficit) Real estate assets - operating lease right-of-use assets Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Unamortized cash discount Discount on exchangeable senior notes Debt Instrument, Unamortized Discount Fixed assets Deferred Tax Liabilities, Property, Plant and Equipment Land - development Land Available for Development Tax credits/true-up, state Income Tax Credits And Adjustments State Income Tax Credits And Adjustments State Schedule of Information about Carrying Amount of Equity Component, Principal Amount of Liability Component, Unamortized Discount and Net Carrying Amount for Notes Convertible Debt [Table Text Block] Net non-lease real estate assets SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net 2021 Finance Lease, Liability, to be Paid, Year One Noncontrolling Interests and Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Pennsylvania PA PENNSYLVANIA Income Taxes Income Tax, Policy [Policy Text Block] OR OREGON Total lease cost Lease, Cost Exercisable at the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Deferred financing costs Payments of Financing Costs Notes receivable Origination of Notes Receivable from Related Parties California Store Lease California Store Lease [Member] California Store Lease [Member] Compensation expense related to stock-based awards APIC, Share-based Payment Arrangement, Increase for Cost Recognition Share repurchase program, period Stock Repurchase Program, Period in Force Net income allocated to Preferred Operating Partnership noncontrolling interests Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable Net Liabilities/ (Assets) Assumed Real Estate Property Acquisition, Increase Assets Acquired And Liabilities Assumed, Net The net value of assets transferred (liabilities assumed) in connection with the acquisition of real estate operating property. Thereafter Long-Term Debt, Maturity, after Year Five Management fees and other income Property management fees and other income Revenue from Contract with Customer, Excluding Assessed Tax Advertising expense Advertising Expense “At the market” equity program At The Market Equity Distribution Agreement [Member] At The Market Equity Distribution Agreement [Member] Lender Name [Axis] Lender Name [Axis] Investments in Debt Securities and Notes Receivable Investment, Policy [Policy Text Block] Operating and finance lease, extension term Lessee, Lease, Renewal Term Lessee, Lease, Renewal Term Number of OP Units Issued (in shares) Number of units issued (in shares) Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued Geographical [Domain] Geographical [Domain] Available for issuance Value Of Stock Available For Issuance Under ATM The dollar amount of shares available for issuance under the entity's "at the market" (ATM) equity program Conversion ratio Debt Instrument, Convertible, Conversion Ratio Operating facilities Operating Facilities [Member] Operating Facilities [Member] Earnings per common share Earnings Per Share, Basic and Diluted [Abstract] DC WASHINGTON Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Issuance and purchase of notes receivable Payments to purchase notes receivable Payments to Acquire Notes Receivable Entity Voluntary Filers Entity Voluntary Filers Credit Facility [Axis] Credit Facility [Axis] SmartStop Self Storage REIT, Inc. Preferred Stock SmartStop Self Storage REIT Inc Series A Convertible Preferred Stock [Member] SmartStop Self Storage REIT Inc Series A Convertible Preferred Stock [Member] Preferred stock, issued (in shares) Preferred Stock, Shares Issued Land - operating Land Unsecured notes payable Unsecured Loan With Bank [Member] Unsecured Loan With Bank [Member] VA VIRGINIA Operating Lessee, Operating Lease, Liability, Payment, Due [Abstract] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Accumulated Depreciation Balance at beginning of year Balance at end of year SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation Exercisable at the end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Proceeds from the sale of common stock, net of offering costs Proceeds from Issuance of Common Stock Debt Instrument, Redemption, Period One Debt Instrument, Redemption, Period One [Member] Number of derivative financial instruments Derivative, Number of Instruments Held Schedule of Computation of Earnings Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] UT UTAH Tranche 2 Term Loan Facility Tranche 2 Term Loan Facility [Member] Tranche 2 Term Loan Facility [Member] Leases Lessee, Finance Leases [Text Block] Revolving lines of credit Amount Drawn Long-term Line of Credit Principal payments on notes payable and revolving lines of credit Cash paid for repurchase of debt Total consideration paid for repurchase Repayments of Debt Texas TX TEXAS Equity Method Investments Equity Method Investments [Table Text Block] Total cash flows for lease liability measurement Cash Paid For Operating Activities, Lessee Cash Paid For Operating Activities, Lessee Restricted stock grants cancelled (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Dispositions and other SEC Schedule, 12-28, Real Estate Companies, Investment In Real Estate, Accumulated Depreciation, Investment In Real Estate Sold And Other Deductions SEC Schedule, 12-28, Real Estate Companies, Investment In Real Estate, Accumulated Depreciation, Investment In Real Estate Sold And Other Deductions Claims and claim adjustment expense (benefit) for claims incurred in the prior years Prior Year Claims and Claims Adjustment Expense Entity Central Index Key Entity Central Index Key Shares related to the Notes included in the computation for diluted earnings per share (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Depreciation expense SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Depreciation Expense Derivative Instrument [Axis] Derivative Instrument [Axis] TN TENNESSEE Senior Notes Senior Notes [Member] Fixed priority return on preferred OP units, stated return rate Noncontrolling Interest In Preferred Operating Partnership Units Fixed Priority Return Stated Rate Of Return Represents the fixed priority return, as a percent, of preferred operating partnership units attributable to noncontrolling preferred unit holders on which the fixed priority return is granted. Geographical [Axis] Geographical [Axis] Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Acquisitions of real estate assets Noncash Or Part Noncash Acquisition Net Real Estate Assets Acquired [Abstract] Noncash Or Part Noncash Acquisition Net Real Estate Assets Acquired [Abstract] Segments [Domain] Segments [Domain] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Noncontrolling interests in Operating Partnership Conversion of Stock, Amount Converted 2024 Long-Term Debt, Maturity, Year Four Number of main components of economic risk Economic Risk Number Of Components Represents the number of components of economic risk. Schedule of Information on Lines of Credit Schedule of Line of Credit Facilities [Table Text Block] Options outstanding, weighted average remaining contractual life Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Lease not yet commenced, number of extension options Lessee, Lease Not Yet Commenced, Number Of Options To Extend Lessee, Lease Not Yet Commenced, Number Of Options To Extend Estimated amount of unrealized gains (losses) expected to be reclassified as interest expense in next fiscal year Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Redemption of noncontrolling interests (in shares) Minority Interest, Decrease From Redemptions, Shares Decrease in noncontrolling interests as a result of the redemption of Operating Partnership units in exchange for common shares. Current expense, federal Current Federal Tax Expense (Benefit) Combined notional amount Notional amounts Derivative, Notional Amount Amortization related to the tenant relationships and lease rights Amortization of Intangible Assets Line of Credit Facility [Table] Line of Credit Facility [Table] Captive insurance subsidiary Deferred Tax Assets Tax Deferred Captive Insurance Subsidiary The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from captive insurance subsidiary, which can only be deducted for tax purposes when actual losses are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. Buildings, improvements and other intangibles Investment Building and Building Improvements GFN JV, LLC GFN JV, LLC [Member] GFN JV, LLC [Member] Investments in Unconsolidated Real Estate Entities Equity Method Investments and Joint Ventures Disclosure [Text Block] Income tax expense, state State and Local Income Tax Expense (Benefit), Continuing Operations Notes exchange, threshold percentage Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Other liabilities Other Liabilities Segment Information Segment Reporting Disclosure [Text Block] Repurchase of exchangeable senior notes with common stock (in shares) Issuance Of Common Stock For Repayment Of Senior Debt, Shares Issuance Of Common Stock For Repayment Of Senior Debt, Shares Issuance of common stock, net of offering costs Stock Issued During Period, Value, New Issues Operating cash outflows for finance lease payments Finance Lease, Interest Payment on Liability Loan to holders of preferred OP units Due from Related Parties, Noncurrent Redemption of Operating Partnership units held by noncontrolling interests for common stock Redemption Of Operating Partnership Units Held By Noncontrolling Interests For Common Stock [Abstract] Redemption Of Operating Partnership Units Held By Noncontrolling Interests For Common Stock [Abstract] Title of 12(b) Security Title of 12(b) Security Disposal Group Classification [Axis] Disposal Group Classification [Axis] Schedule of Real Estate Properties [Table] Schedule of Real Estate Properties [Table] IL ILLINOIS IN INDIANA Debt securities, extension term Debt Securities Held To Maturity, Extension Term Debt Securities Held To Maturity, Extension Term Undiscounted Cash Flows on an Annual Basis, Financing Leases Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] Net proceeds from sale of stock Sale of Stock, Consideration Received on Transaction Fixed priority return on preferred OP units, amount Noncontrolling Interest In Preferred Operating Partnership Units Fixed Priority Return Amount Represents the carrying amount of preferred operating partnership units attributable to noncontrolling preferred unit holders on which the fixed priority return is granted. Summarized Statement of Components of Income Tax Provision Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Voting interests of third-party owners Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Notes Payable to Trusts Notes Payable to Trusts Disclosure [Text Block] Notes Payable to Trusts Disclosure Product and Service [Axis] Product and Service [Axis] Finance Lease, Liability, Statement of Financial Position [Extensible List] Finance Lease, Liability, Statement of Financial Position [Extensible List] Investment Type [Axis] Investment Type [Axis] Unrecognized compensation cost, period of recognition Term over which compensation cost recognized (in years) Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2025 Finance Lease, Liability, to be Paid, Year Five Supplemental schedule of cash flow information Supplemental Cash Flow Elements [Abstract] 2022 Long-Term Debt, Maturity, Year Two HI HAWAII Amortization period Debt Issuance Cost Amortization Period Debt Issuance Cost Amortization Period Amortization amount of excess purchase price included in equity earnings Equity Method Investment, Difference Between Carrying Amount and Underlying Equity 2024 Lessee, Operating And Finance Lease, Liability, Payments, Due Year Four Lessee, Operating And Finance Lease, Liability, Payments, Due Year Four Earnings for basic computations Net Income (Loss) Available to Common Stockholders, Basic Gain (loss) recognized in OCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Liquidation value (in dollars per share) Noncontrolling Interest In Preferred Operating Partnership Units Liquidation Value Per Unit Represents the liquidation value per unit of preferred operating partnership units. Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Dividends paid on common stock (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Debt Instrument [Axis] Debt Instrument [Axis] Operating Segments Operating Segments [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Real estate under development/redevelopment Development in Process Purchase of equipment and fixtures Payments to Acquire Furniture and Fixtures Noncontrolling interest represented by Preferred Operating Partnership units, net Noncontrolling Interest in Preferred Unit Holders Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] OP Units issued in conjunction with acquisitions (in shares) Noncontrolling Interest, Operating Partnership Units Issued With Acquisition Noncontrolling Interest, Operating Partnership Units Issued With Acquisition Variable lease cost Variable Lease, Cost Exchangeable senior notes Convertible Debt, Fair Value Disclosures State and local tax expense - net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Options exercisable (in shares) Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable Minimum shares issued for each PSU (in shares) Share-based Compensation By Share Based Payment Award, Minimum Shares Issued Per Performance Stock Unit Share-based Compensation By Share Based Payment Award, Minimum Shares Issued Per Performance Stock Unit Investment, preferred dividend rate Preferred Stock Investment, Dividend Rate Preferred Stock Investment, Dividend Rate Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Subsequent Event Subsequent Event [Member] OH OHIO Redemption price as percentage of principal amount of notes at request of debt holders and upon occurrence of designated event Redemption Price Of Debt As Percentage Of Principal Amount At Request Of Debt Holders Represents the percentage of principal amount used in computation of the redemption price to be paid on conversion of convertible notes at the request of the debt holders and upon the occurrence of a designated event. Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Issuance of Preferred OP Units for additional investment in unconsolidated real estate venture Preferred Operating Partnership Units [Abstract] Preferred Operating Partnership Units Tax credits/true-up Income Tax Reconciliation Tax Credits Adjustments Income Tax Reconciliation Tax Credits Adjustments Quarterly distribution per preferred OP unit payable above quarterly distribution for common OP Unit (in dollars per share) Noncontrolling Interest In Preferred Operating Partnership Units Quarterly Distribution Per Unit Payable Above Quarterly Distribution For Common Operating Partnership Unit Represents the quarterly distribution per preferred OP unit payable above quarterly distribution for common OP Unit. Non-taxable REIT income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount NY NEW YORK NV NEVADA Contractual interest Interest Expense, Debt, Excluding Amortization Fair Value Estimate of Fair Value Measurement [Member] Gain (loss) on disposition of assets Gain (Loss) on Disposition of Assets Repurchase of exchangeable senior notes Repayments of Senior Debt Gross carrying amount - Land SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Land, Amount Alan Jathoo JV LLC Alan Jathoo JV LLC [Member] Alan Jathoo JV LLC [Member] Accrual of interest income added to principal of debt securities and notes receivable Noncash Interest Income Noncash Interest Income NC NORTH CAROLINA Lease expense related to operating leases Operating Leases, Rent Expense Investments in Debt Securities and Bridge Loans Receivable Schedule Of Investments In Debt Securities And Financing Receivables [Table Text Block] Schedule Of Investments In Debt Securities And Financing Receivables NH NEW HAMPSHIRE NM NEW MEXICO New Jersey NJ NEW JERSEY Period from date of issuance after which preferred OP units will become convertible into common OP units at the option of the holder Noncontrolling Interest In Preferred Operating Partnership Units Period From Date Of Issuance After Which Units Become Convertible Represents the period from the date of issuance after which preferred units will become convertible into common OP units at the option of the holder. MO MISSOURI Interest income Interest income Investment Income, Interest MN MINNESOTA Lease Option Two Lease Option Two [Member] Lease Option Two [Member] Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] MS MISSISSIPPI Share repurchase program, remaining authorization value Stock Repurchase Program, Remaining Authorized Repurchase Amount Comprehensive income attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent 2023 Finance Lease, Liability, to be Paid, Year Three Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Underwriting fee percentage Percentage of Underwriting Fee Percentage of Underwriting Fee Preferred stock, par value (dollars per share) Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Schedule of Reconciliation of Statutory Income Tax Provisions to the Effective Income Tax Provisions Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] 2021 Long-Term Debt, Maturity, Year One MD MARYLAND MA MASSACHUSETTS Legal Entity [Axis] Legal Entity [Axis] City Area Code City Area Code Cash paid for amounts included in the measurement of lease liabilities Cash Flow, Operating Activities, Lessee [Abstract] Document Period End Date Document Period End Date MI MICHIGAN $65.45 - $65.45 Exercise Price Range Three [Member] Exercise Price Range Three [Member] Distributions to Operating Partnership units held by noncontrolling interests Partners' Capital Account, Distributions Operating ground leases Operating Ground Lease [Member] Operating Ground Lease [Member] Share repurchase program, aggregate value Stock Repurchase Program, Authorized Amount Net income Net income Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Operating lease, original lease term Lessee, Operating Lease, Term of Contract Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-maturity Securities [Line Items] Extra Space West Two LLC Extra Space West Two LLC [Member] Extra Space West Two LLC [Member] Extra Space West One LLC Extra Space West One LLC [Member] Extra Space West One LLC [Member] Schedule III - Real Estate and Accumulated Depreciation SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Text Block] LA LOUISIANA Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Compensation expense related to stock-based awards Share-based Payment Arrangement, Noncash Expense Buyback of common stock, net of offering costs Stock Repurchased During Period, Value Tenant reinsurance Tenant Reinsurance Expense The expense in the period incurred with respect to the entity's tenant reinsurance program. Cover page. Cover [Abstract] Base rate Base Rate [Member] Number of stores managed for third parties Number Of Real Estate Properties Franchisees And Others The number of real estate properties owned by franchisees and other third parties as of the balance sheet date. Corporate Office And Call Center Lease Corporate Office And Call Center Lease [Member] Corporate Office And Call Center Lease [Member] KS KANSAS KY KENTUCKY Other corporate assets Other Corporate Assets [Member] Other Corporate Assets [Member] Net carrying amount of liability component Long-term Debt Maximum shares issued for each PSU (in shares) Share-based Compensation By Share Based Payment Award, Maximum Shares Issued Per Performance Stock Unit Share-based Compensation By Share Based Payment Award, Maximum Shares Issued Per Performance Stock Unit Leases Lessee, Operating Leases [Text Block] Repurchase of equity portion of 2015 exchangeable senior notes (in shares) Stock Issued During Period, Repurchase Of Equity Portion Of Exchangeable Senior Notes, Shares Stock Issued During Period, Repurchase Of Equity Portion Of Exchangeable Senior Notes, Shares CA CALIFORNIA Total expenses Operating expenses Costs and Expenses Equity Components [Axis] Equity Components [Axis] Change in fair value of interest rate swaps Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Net liabilities assumed Noncash or Part Noncash Acquisition, Value of Liabilities Assumed Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Total deferred tax assets Deferred Tax Assets, Gross Minimum Minimum [Member] Balance Sheet Location [Domain] Balance Sheet Location [Domain] PRISA Self Storage LLC Prisa Self Storage LLC [Member] Prisa Self Storage LLC [Member] Principal payments on notes payable to trusts Principal payments on notes payable to trusts Repayments of Notes Payable Number of properties whereby leases have been assumed at rates lower than the current market rates Number Of Properties Related To Ground Leases Assumed By The Entity At Rates Lower Than Current Market Rates Represents the number of properties related to ground leases, where the leases were assumed by the entity at rates that were lower than the current market rates for similar leases. Finance Lease Liability Noncash acquisition, finance lease liability Noncash or Part Noncash Acquisition, Finance Lease Liability Noncash or Part Noncash Acquisition, Finance Lease Liability Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Entity Interactive Data Current Entity Interactive Data Current AZ ARIZONA Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Revenues: Revenues [Abstract] Number of extensions available Line Of Credit Facility, Number Of Extensions Available Line Of Credit Facility, Number Of Extensions Available Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Summary of Stock Option Activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Stock-Based Compensation Share-based Payment Arrangement [Policy Text Block] Maximum amount of insurance coverage Tenant Reinsurance Policy Maximum Amount Of Insurance Coverage Represents the maximum amount of insurance coverage under the tenant reinsurance policy. AL ALABAMA Derivative [Table] Derivative [Table] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Total deferred tax liabilities Deferred Tax Liabilities, Gross Percentage of all distributions to stockholders which qualified as a return of capital Percentage Of All Distributions To Stockholders Which Classifies As Return Of Capital Represents the percentage of all distributions to stockholders which qualifies as a return of capital. Advertising Costs Advertising Cost [Policy Text Block] Operating lease right-of-use assets Deferred Tax Liabilities, Right-Of-Use Asset Deferred Tax Liabilities, Right-Of-Use Asset Number of reportable segments Number of Reportable Segments Exercise Price Range [Axis] Exercise Price Range [Axis] Credit Line 2 Second Credit Line [Member] Second Credit Line [Member] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Consolidation Items [Axis] Consolidation Items [Axis] Number of days of written notice to holders of notes required for redemption Written Notice Required For Redemption Period Represents the number of days of written notice to be made to the holders of the notes required for redemption. Total Lessee, Operating And Finance Lease, Liability, Payments, Due Lessee, Operating And Finance Lease, Liability, Payments, Due Total Lessee, Operating Lease, Liability, to be Paid Ownership interest held by entity (as a percent) Noncontrolling Interest, Ownership Percentage by Parent Other Deferred Tax Assets, Other Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Notes exchange, threshold trading days Debt Instrument, Convertible, Threshold Trading Days Store Count SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Number of Stores SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Number of Stores Building and Improvements Initial Cost SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Building and Improvements Tranche 3 Term Loan Facility Tranche 3 Term Loan Facility [Member] Tranche 3 Term Loan Facility [Member] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Distributions from unconsolidated real estate ventures in excess of earnings Income (Loss) from Equity Method Investments, Net of Dividends or Distributions SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] Number of votes, common stockholder rights Common Stock Voting Rights Votes Number Represents the number of votes holders of common stock are entitled regarding all matters submitted to a vote of stockholders. Purchase of note receivable Financing Receivable, Purchase Acquisition of real estate assets Real Estate Additions, Portion Not Yet Paid Real Estate Additions, Portion Not Yet Paid Commitment to acquire stores with joint venture partners Commitment To Acquire Retail Space With Joint Venture Partners [Member] Commitment To Acquire Retail Space With Joint Venture Partners [Member] Disposal of New York Store New York Store [Member] New York Store [Member] Finance lease cost: Finance Lease, Cost1 [Abstract] Finance Lease, Cost1 [Abstract] Contributions joint ventures Contributions To Equity Method Investments, Including Noncash Amounts Contributions To Equity Method Investments, Including Noncash Amounts Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Real estate, gross: SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] Redemption of units for stock Redemption Of Units For Common Stock [Member] Redemption Of Units For Common Stock [Member] Reacquisition of equity component Debt Instrument, Repurchase of Equity Component Debt instrument, repurchase of equity component. Document Transition Report Document Transition Report Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Payments for prior year claims Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years District Office Lease District Office Lease [Member] District Office Lease [Member] Conversion of units, units converted (in shares) Conversion of Stock, Shares Converted GA GEORGIA 2015 Notes Exchangeable Senior Notes Three Point One Two Five Percent Due Two Thousand And Thirty Five [Member] Exchangeable Senior Notes Three Point One Two Five Percent Due Two Thousand And Thirty Five [Member] Return of investment in unconsolidated real estate ventures Return Of Investment Real Estate Ventures Distributions that represent a return of original investment from real estate ventures. Strike rate Derivative, Fixed Interest Rate Other liabilities Other Liabilities [Member] Vested and Expected to Vest (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Credit Facility [Domain] Credit Facility [Domain] FL FLORIDA Proceeds from sale of real estate assets Proceeds from Sale of Real Estate Held-for-investment Construction in Progress/Undeveloped Land Construction In Progress And Undeveloped Land [Member] Construction In Progress And Undeveloped Land [Member] Value of OP Units Issued Value of units issued Real Estate Property Asset Acquisition, Consideration Transferred, Equity Interest Issued Or Issuable Real Estate Property Asset Acquisition, Consideration Transferred, Equity Interest Issued Or Issuable Basic (in dollars per share) Earnings Per Share, Basic Expected term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Entity File Number Entity File Number Exchange of Common Operating Partnership Units Noncontrolling Interest Policy [Policy Text Block] Noncontrolling Interest Policy [Text Block] Redemption of Operating Partnership units held by noncontrolling interests Cash Portion Of Redemption Of Preferred Operating Partnership Units The amount of cash paid upon the redemption of Preferred Operating Partnership Units. Weighted average remaining lease term - operating leases (years) Operating Lease, Weighted Average Remaining Lease Term Number of stores sold Number of Stores Sold Number of stores purchased. Development and redevelopment of real estate assets Construction In Progress Additions, Portion Not Yet Paid Construction In Progress Additions, Portion Not Yet Paid Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] Contributions from noncontrolling interests Proceeds from Noncontrolling Interests Dividends paid on common stock Dividends, Common Stock Compensation cost Share-based Payment Arrangement, Expense Balance Sheet Location [Axis] Balance Sheet Location [Axis] Disposal Group Name [Axis] Disposal Group Name [Axis] Document Annual Report Document Annual Report Storage Portfolio III JV LLC Storage Portfolio III JV LLC [Member] Storage Portfolio III JV LLC Exercisable at the end of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 2024 Finance Lease, Liability, to be Paid, Year Four Retirement Benefits [Abstract] Retirement Benefits [Abstract] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, by Property [Table] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, by Property [Table] Receivable [Domain] Receivable [Domain] Lease Option One Lease Option One [Member] Lease Option One [Member] Proceeds from sale of real estate assets Proceeds from Sale of Other Real Estate Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Other Deferred Tax Liabilities, Other Period from date of issuance after which preferred OP units will become redeemable at the option of the holder Noncontrolling Interest In Preferred Operating Partnership Units Period From Date Of Issuance After Which Units Become Redeemable Represents the period from the date of issuance after which preferred units will become redeemable at the option of the holder. Extinguishment of liability component Extinguishment of liability component Extinguishment of Debt, Amount Debt securities, dividend rate Debt Securities Held To Maturity, Dividend Rate Debt Securities Held To Maturity, Dividend Rate CT CONNECTICUT Other liabilities - Cash flow hedge swap agreements Liability derivatives Interest Rate Cash Flow Hedge Liability at Fair Value Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Series B Units Series B Units [Member] Series B Units [Member] Total liabilities, noncontrolling interests and equity Liabilities and Equity DC DISTRICT OF COLUMBIA Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Income Taxes Income Tax Disclosure [Text Block] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Debt securities, period after which preferred dividends increase annually Debt Securities Held To Maturity, Period After Which Preferred Dividends Increase Annually Debt Securities Held To Maturity, Period After Which Preferred Dividends Increase Annually Operating lease cost Operating Lease, Cost Hedging Relationship [Axis] Hedging Relationship [Axis] Notes receivable Financing Receivable, after Allowance for Credit Loss General and administrative General and administrative expense General and Administrative Expense Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Maximum number of preferred OP units converted prior to the maturity date of the loan (in shares) Noncontrolling Interest Conversion Of Preferred Operating Partnership Units Before Maturity Of Loan Maximum Represents the maximum number of preferred operating partnership units that can be converted by noncontrolling holders of preferred units before maturity date of the loan. Anti-dilutive securities excluded from computation of earnings per common share (in shares) Equivalent Shares (if converted) (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Current expense, total Current Income Tax Expense (Benefit) Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Repayment of receivable for preferred operating units pledged as collateral on loan Noncontrolling Interest, Repayment Of Receivable For Preferred Operating Units Pledged As Collateral On Loan Noncontrolling Interest, Repayment Of Receivable For Preferred Operating Units Pledged As Collateral On Loan Weighted average remaining lease term - finance leases (years) Finance Lease, Weighted Average Remaining Lease Term Schedule of Equity in Earnings of Unconsolidated Real Estate Ventures Schedule Of Equity Method Investments Income (Loss) [Table Text Block] Tabular disclosure of the entity's equity in earnings of the unconsolidated joint ventures accounted for under the equity method of investment. Colorado CO COLORADO Average period that a tenant is expected to utilize the facility Finite-Lived Intangible Asset, Useful Life Equity Component [Domain] Equity Component [Domain] Debt, measurement input Debt Instrument Discount Rate Represents the percentage of debt discount that was originally recognized at the issuance of the instrument. $47.50 - $47.50 Exercise Price Range One [Member] Exercise Price Range One [Member] Changes In Equity And Comprehensive Income [Table] Changes In Equity And Comprehensive Income [Table] Changes In Equity And Comprehensive Income [Table] Unamortized software costs Property, Plant and Equipment, Net Summary of Amount of Interest Cost Recognized Relating to Contractual Interest Rate and Amortization of Discount on Liability Component of Notes Schedule of Interest and Amortization Discount Cost [Table Text Block] Tabular disclosure of interest cost recognized and the amortization of the discount on the liability component of the convertible debt instrument. Entity Tax Identification Number Entity Tax Identification Number Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Stock-Based Compensation Share-based Payment Arrangement [Text Block] Net income attributable to common stockholders Net income attributable to common stockholders Net Income (Loss) Attributable to Parent Cash Paid Cash paid to acquire properties Payments To Acquire Assets, Gross Payments To Acquire Assets, Gross Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Carrying amount of equity component Debt Instrument, Convertible, Carrying Amount of Equity Component Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Management fee revenues Property Management Fee Revenue LIBOR London Interbank Offered Rate (LIBOR) [Member] Investments in unconsolidated real estate ventures Non-Cash Decrease In Investments In Unconsolidated Entities Non-Cash Decrease In Investments In Unconsolidated Entities Current Fiscal Year End Date Current Fiscal Year End Date Ten day average closing stock price (in dollars per share) Common Stock Average Closing Market Price The average closing market price of the entity's common stock. Number of properties to be acquired Number Of Real Estate Properties To Be Acquired Number Of Real Estate Properties To Be Acquired Lease liabilities Finance Lease, Liability Debt securities Debt Securities, Held-to-maturity Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes Amortization Of Debt Discount (Premium), Equity Component Of Senior Notes Amortization Of Debt Discount (Premium), Equity Component Of Senior Notes Stock option activity Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Exchangeable senior notes, net Exchangeable senior notes Principal amount of liability component Convertible Debt Restricted stock grants issued Stock Issued During Period, Value, Restricted Stock Award, Gross Notes Receivable-Senior Mezzanine Loan Notes Receivable [Member] Number of storage facilities in which the entity had equity interests Number of Real Estate Properties Thereafter Finance Lease, Liability, to be Paid, after Year Five Principal payments received from notes receivable Proceeds from Collection of Notes Receivable Effective Income Tax Rate Reconciliation, Percent [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Total initial investment Equity Method Investment, Aggregate Cost Real estate assets held for sale included in net real estate assets Real Estate Held-for-sale Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Noncontrolling interest in consolidated joint venture Noncontrolling Interest, Increase From Transactions With Other Noncontrolling Interests, Net Noncontrolling Interest, Increase From Transactions With Other Noncontrolling Interests, Net Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Other Commitments [Domain] Other Commitments [Domain] Issuance of common stock, net of offering costs (in shares) Stock Issued During Period, Shares, New Issues Dividends Receivable Dividends Receivable Tenant Reinsurance Tenant Reinsurance [Member] Tenant Reinsurance [Member] Repurchase of exchangeable senior notes Repayments of Debt Instruments The cash outflow to repay fair value of debt instruments. Vested and Expected to Vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Operating lease, termination option, term Lease Contract, Term After Which Can Be Terminated Lease Contract, Term After Which Can Be Terminated Summary of Company's Employee and Director Share Grant Activity Schedule of Nonvested Share Activity [Table Text Block] Unvested restricted stock awards included for treasury stock method (in shares) Incremental Common Shares Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends Hedging Relationship [Domain] Hedging Relationship [Domain] Right of use asset - finance lease Finance Lease, Right-of-Use Asset, after Accumulated Amortization ESS-NYFL JV LLC ESS-NYFL JV LLC [Member] ESS-NYFL JV LLC Undiscounted Cash Flows on an Annual Basis, Operating Leases Lessee, Operating Lease, Liability, Maturity [Table Text Block] Effective Income Tax Rate Reconciliation, Amount [Abstract] Effective Income Tax Rate Reconciliation, Amount [Abstract] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Miscellaneous Effective Income Tax Rate Reconciliation, Other Adjustments, Amount 2023 Lessee, Operating And Finance Lease, Liability, Payments, Due Year Three Lessee, Operating And Finance Lease, Liability, Payments, Due Year Three Value of Preferred Operating Partnership units issued Stock Issued Basic (in shares) Average number of common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Basis spread on variable rate Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Common OP Units Common OP Units [Member] Common OP Units Risk-free rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Ownership [Axis] Ownership [Axis] Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Cash flow hedging Cash Flow Hedging [Member] Tenant reinsurance Direct Premiums Earned Carrying Value Reported Value Measurement [Member] ESS-NYFL JV LP ESS-NYFL JV LP [Member] ESS-NYFL JV LP [Member] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Equity Ownership % Equity ownership % Equity Method Investment, Ownership Percentage Investments in debt securities and notes receivable Investments in debt securities and notes receivable Debt Securities, Held To Maturity And Financing Receivable, After Allowance For Credit Loss, And Interest Receivable Debt Securities, Held To Maturity And Financing Receivable, After Allowance For Credit Loss, And Interest Receivable Real estate assets - operating lease right-of-use assets Right-of-use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Number of Stores Number of stores acquired Number Of Real Estate Properties Acquired Represents the number of real estate properties acquired. Income tax expense Total provision Income Tax Expense (Benefit) Minimum amount of insurance coverage Tenant Reinsurance Policy Minimum Amount Of Insurance Coverage Represents the minimum amount of insurance coverage under the tenant reinsurance policy. Cash, cash equivalents, and restricted cash, beginning of the period Cash, cash equivalents, and restricted cash, end of the period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Reduction of noncontrolling interest for note receivable Note Receivable, Reduction Of Noncontrolling Interests Note Receivable, Reduction Of Noncontrolling Interests Schedule of Maturities of Notes Payable Schedule of Maturities of Long-term Debt [Table Text Block] WICNN JV LLC WICNN JV LLC [Member] WICNN JV LLC [Member] Local Phone Number Local Phone Number Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Derivative [Line Items] Derivative [Line Items] Number of stores acquired, previously held noncontrolling interest Number Of Real Estate Properties Acquired, Previous Noncontrolling Interest Held Number Of Real Estate Properties Acquired, Previous Noncontrolling Interest Held Exercise price range, upper limit (in dollars per share) Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit Total Notes payable Notes payable to Trusts Long-term Debt, Gross Proceeds from sale of notes receivable Proceeds from Sale of Notes Receivable Other assets Increase (Decrease) in Other Operating Assets Issuance of common stock upon the exercise of options Stock Issued During Period, Value, Stock Options Exercised Debt Capacity Line of Credit Facility, Maximum Borrowing Capacity Award Type [Axis] Award Type [Axis] Issuance of Operating Partnership units in conjunction with acquisitions Partners' Capital Account, Acquisitions Summary of Repurchase of Debt Schedule of Debt Repurchase [Table Text Block] Schedule of Debt Repurchase [Table Text Block] Lease Contractual Term [Domain] Lease Contractual Term [Domain] Amortization of deferred financing costs Amortization of Debt Issuance Costs Intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Accumulated Deficit Retained Earnings [Member] Preferred stock, outstanding (in shares) Preferred Stock, Shares Outstanding Measurement Basis [Axis] Measurement Basis [Axis] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Weighted average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Conversion of Preferred C Units in the Operating Partnership for Common Operating Partnership Units Noncontrolling Interest, Conversion Of Preferred Units to Common Units Noncontrolling Interest, Conversion Of Preferred Units to Common Units Outstanding at the beginning of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Percentage of company's matching contributions of first 3 percent of employee's compensation Percentage of Matching Contribution Made By Company For First Three Percent of Participants Compensation Represents the percentage of the company's matching contributions of first 3 percent of employee's compensation. Award Type [Domain] Award Type [Domain] Lease Option [Axis] Lease Option [Axis] Lease Option [Axis] Exercisable at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Net operating real estate assets Net Operating Real Estate Assets The carrying amount of real estate assets including land, buildings, improvements, intangible assets and intangible lease rights, net of accumulated depreciation and amortization. Other commitment Other Commitment Operating Partnership Common Operating Partnership [Member] Common Operating Partnership [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Less: accumulated depreciation and amortization Real Estate Investment Property, Accumulated Depreciation Variable rate notes payable Long-term Debt, Percentage Bearing Variable Interest, Amount Expected tax at statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Operating lease liabilities Establishment Of Operating Lease Liability Establishment Of Operating Lease Liability Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] East Space West One LLC and East Space West Two LLC East Space West One LLC And East Space West Two LLC [Member] East Space West One LLC And East Space West Two LLC Vested and Expected to Vest (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract]