Equity [Abstract] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Notes payable to Trusts Trust Preferred Securities Subject to Mandatory Redemption [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Operating Partnership Extra Space Storage LP [Member] Extra Space Storage LP [Member] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Trust III ESS Statutory Trust III [Member] ESS Statutory Trust III [Member] Trust II ESS Statutory Trust II [Member] ESS Statutory Trust II [Member] Trust ESS Statutory Trust I [Member] ESS Statutory Trust I [Member] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] Preferred Securities Preferred Securities [Member] Preferred Securities [Member] Common Securities Common Securities [Member] Common Securities [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Issuance of securities Issuance Of Securities Represents the value of the securities issued during the period. Number of securities issued (in securities) Issuance Of Securities Number Represents the number of securities issued. Proceeds from issuance of securities Proceeds From Issuance Of Securities Represents the cash inflow from the issuance of securities. Interest rate, fixed Debt Instrument, Interest Rate During Period Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Interest rate swap, fixed interest rate Derivative, Fixed Interest Rate Prepayment premium Debt Instrument Prepayment Premium Amount Debt instrument prepayment premium amount. Principal payments on notes payable to trusts Repayments of Notes Payable Notes payable to Trusts Long-term Debt, Gross Unamortized deferred financing costs, net Debt Issuance Costs, Net Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Affiliated entities and joint ventures Affiliated Entity [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Management fees and other income Revenue from Contract with Customer, Excluding Assessed Tax Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Accounting Policies [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Domain] Lease Arrangement, Type [Domain] Operating ground leases Operating Ground Lease [Member] Operating Ground Lease [Member] Corporate facility leases Corporate Facility Lease [Member] Corporate Facility Lease [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU 2016-02 Accounting Standards Update 2016-02 [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Estimated Scenario, Forecast [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Number of operating ground leases Lessee, Operating Lease, Number Of Leases Lessee, Operating Lease, Number Of Leases Lease assets Operating Lease, Right-of-Use Asset Lease liabilities Operating Lease, Liability Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Advertising expense Advertising Expense Debt Disclosure [Abstract] Notes Payable and Revolving Lines of Credit Debt Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in fair value of interest rate swaps Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent REIT taxable income required to be distributed (as a percent) Percentage Of Annual REIT Taxable Income Distributable To Stockholders Minimum Represents the minimum percentage of annual taxable income which must be distributed to stockholders in order to maintain its qualification as a REIT. 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. Unrecognized tax benefits Unrecognized Tax Benefits Interest or penalties related to uncertain tax provisions Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Senior Notes Senior Notes [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 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] 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] Debt Instrument [Line Items] Debt Instrument [Line Items] Carrying amount of equity components Debt Instrument, Convertible, Carrying Amount of Equity Component Principal amount of liability component Convertible Debt Unamortized discount - equity components 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. Unamortized cash discount Debt Instrument, Unamortized Cash Discount Debt Instrument, Unamortized Cash Discount Unamortized debt issuance costs Net carrying amount of liability components Long-term Debt Derivative Instruments and Hedging Activities Disclosure [Abstract] Schedule Summarizing Terms of Entity's Derivative Financial Instruments Schedule of Derivative Instruments [Table Text Block] 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] Schedule of Information Relating to Gain (Loss) Recognized on Swap Agreements Derivative Instruments, Gain (Loss) [Table Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Fair Value Disclosures Fair Value of Financial Instruments, Policy [Policy Text Block] Real Estate Assets Property, Plant and Equipment, Policy [Policy Text Block] Investments in Unconsolidated Real Estate Ventures Equity Method Investments [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Other Assets Other Assets Policy [Policy Text Block] Disclosure of accounting policy for other noncurrent assets. Derivative Instruments and Hedging Activities Derivatives, Policy [Policy Text Block] Risk Management and Use of Financial Instruments Risk Management Activities Policy [Policy Text Block] Risk Management Activities Policy [Text Block] Exchange of Common Operating Partnership Units Noncontrolling Interest Policy [Policy Text Block] Noncontrolling Interest Policy [Text Block] Revenue and Expense Recognition Revenue And Expense Recognition Policy [Policy Text Block] Revenue And Expense Recognition Policy [Text Block] Advertising Costs Advertising Costs, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Earnings Per Common Share Earnings Per Share, Policy [Policy Text Block] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Convertible Debt Convertible Debt Policy [Policy Text Block] Convertible Debt Policy [Policy Text Block] Contractual interest Interest Expense, Debt, Excluding Amortization Amortization of discount Amortization of Debt Discount (Premium) Total interest expense recognized Interest Expense, Debt Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] $6.22 - $6.22 Exercise Price Range One [Member] Exercise Price Range One [Member] $11.59 - $11.59 Exercise Price Range Two [Member] Exercise Price Range Two [Member] $12.21 - $12.21 Exercise Price Range Three [Member] Exercise Price Range Three [Member] $19.6 - $28.79 Exercise Price Range Four [Member] Exercise Price Range Four [Member] $38.4 - $38.4 Exercise Price Range Five [Member] Exercise Price Range Five [Member] $47.5 - $47.5 Exercise Price Range Six [Member] Exercise Price Range Six [Member] $65.36 - $65.36 Exercise Price Range Seven [Member] Exercise Price Range Seven [Member] $65.45 - $65.45 Exercise Price Range Eight [Member] Exercise Price Range Eight [Member] $73.52 - $73.52 Exercise Price Range Nine [Member] Exercise Price Range Nine [Member] $85.99 - $85.99 Exercise Price Range Ten [Member] Exercise Price Range Ten [Member] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Exercise price range, lower limit (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Exercise price range, upper limit (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Options outstanding (in shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Options outstanding, weighted average remaining contractual life Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term Weighted average exercise price (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Options exercisable (in shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options Options exercisable, weighted average exercise price (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Segment reconciling items Segment Reconciling Items [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Self-Storage Operations Self Storage Operations [Member] Self Storage Operations [Member] Tenant Reinsurance Tenant Reinsurance [Member] Tenant Reinsurance [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Revenues Revenues Operating expenses Costs and Expenses Net operating income Operating Income (Loss) Property management fees and other income General and administrative expense General and Administrative Expense Depreciation and amortization expense Depreciation, Depletion and Amortization, Nonproduction Acquisition and other related costs Business Combination, Acquisition Related Costs Gain on real estate transactions, earnout from prior acquisitions and impairment of real estate Gains (Losses) On Real Estate Transactions and Earn Out From Prior Acquisition and Sale of Other Assets Gains losses on real estate transactions and earn out from prior acquisition and sales of other assets Interest expense Interest Expense Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes Interest income Investment Income, Interest Equity in earnings of unconsolidated real estate ventures Income (Loss) from Equity Method Investments Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of partners' interests Gain (Loss) On Sale Of Real Estate Assets And Purchase Of Partners Interests The gain (loss) included in earnings resulting from the sale of real estate assets and the purchase of joint venture partners' interests. Income tax expense Income Tax Expense (Benefit) Net income Noncontrolling Interest [Abstract] Noncontrolling Interest Represented By Preferred Operating Partnership Units Noncontrolling Interest Disclosure [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Performance-Based Stock Units Performance Shares [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Balance at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Balance at the end of the period (in shares) Weighted-Average Grant-Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Balance at the beginning 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 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 Balance at the end of the period (in dollars per share) Number of main components of economic risk Economic Risk Number Of Components Represents the number of components of economic risk. Notes Payable Notes Payable to Banks [Member] 2019 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2020 Long-term Debt, Maturities, Repayments of Principal in Year Two 2021 Long-term Debt, Maturities, Repayments of Principal in Year Three 2022 Long-term Debt, Maturities, Repayments of Principal in Year Four 2023 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Total Noncontrolling Interest [Table] Noncontrolling Interest [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Preferred Operating Partnership, Series C Series C Preferred Operating Partnership [Member] Series C Preferred Operating Partnership [Member] Operating Partnership Common Operating Partnership [Member] Common Operating Partnership [Member] Preferred Units by Name [Axis] Preferred Units by Name [Axis] Preferred Units, Class [Domain] Preferred Units, Class [Domain] Series A Units Series A Units [Member] Series A Units [Member] Series B Units Series B Units [Member] Series B Units [Member] Series C Units Series C Units [Member] Series C Units [Member] Series D Units Series D Units [Member] Series D Units [Member] 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] Operating Partnership Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Loan to holders of preferred OP units Due from Related Parties, Noncurrent 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. 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. 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. 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. Preferred units outstanding (in shares) Preferred Units, Outstanding Note receivable interest rate Notes Receivable Stated Interest Rate Represents the stated interest rate of notes receivable. Additional units redeemed 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. 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. Fixed liquidation value Noncontrolling Interest In Preferred Operating Partnership Units Fixed Liquidation Value Represents the fixed liquidation value of preferred operating partnership units. 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. 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. Basis for determining fixed quarterly distribution in year 5, period before fifth anniversary Noncontrolling Interest In Preferred Operating Partnership Units Number Of Periods Immediately Preceding Fifth Anniversary Of Issuance Averaged For Future Distributions The number of periods immediately preceding the fifth anniversary of issuance of the preferred units which are averaged to determine the amount of quarterly distributions to be paid after the fifth anniversary of issuance. 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. 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. 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. Conversion of units, units converted (in shares) Conversion of Stock, Shares Converted 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 Number of units issued (in shares) Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued Reduction of noncontrolling interest for note receivable Note Receivable, Reduction Of Noncontrolling Interests Note Receivable, Reduction Of Noncontrolling Interests 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 Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Restatement [Axis] Restatement [Axis] Restatement [Domain] Restatement [Domain] Reclassification Restatement Adjustment [Member] Error Corrections and Prior Period Adjustments Restatement [Line Items] Error Corrections and Prior Period Adjustments Restatement [Line Items] Investments in unconsolidated real estate ventures Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures Cash distributions in unconsolidated real estate ventures Cash Distributions In Unconsolidated Real Estate Ventures Cash Distributions In Unconsolidated Real Estate Ventures Notes Payable to Trusts Notes Payable to Trusts Disclosure [Table Text Block] Notes Payable to Trusts Disclosure [Table Text Block] Equity Method Investments and Joint Ventures [Abstract] Schedule of Investments in Unconsolidated Real Estate Ventures Schedule Of Real Estate Joint Ventures [Table Text Block] Tabular disclosure of information related to real estate joint ventures. Equity Method Investments Equity Method Investments [Table Text Block] 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. Quarterly Financial Information Disclosure [Abstract] Supplementary Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Number of reportable segments Number of Reportable Segments Summarized Statement of Components of Income Tax Provision Schedule of Components of Income Tax Expense (Benefit) [Table 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] Schedule of Major Sources of Temporary Differences Stated at their Deferred Tax Effects Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Deferred Tax Liabilities, Gross [Abstract] Deferred Tax Liabilities, Gross [Abstract] Fixed assets Deferred Tax Liabilities, Property, Plant and Equipment Other Deferred Tax Liabilities, Other State deferred taxes Deferred Tax Liabilities State Taxes Deferred Tax Liabilities State Taxes Total deferred tax liabilities Deferred Tax Liabilities, Gross Deferred Tax Assets, Gross [Abstract] Deferred Tax Assets, Gross [Abstract] 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. Accrued liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Stock compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Solar credit Deferred Tax Assets, Tax Credit Carryforwards Other Deferred Tax Assets, Other SmartStop TRS Deferred Tax Assets, Investment in Subsidiaries State deferred taxes Deferred Tax Assets, State Taxes Total deferred tax assets Deferred Tax Assets, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Net deferred income tax liabilities Deferred Tax Liabilities, Net Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Credit Line 1 First Credit Line [Member] First Credit Line [Member] Credit Line 2 Second Credit Line [Member] Second Credit Line [Member] Amount Drawn Long-term Line of Credit Capacity Line of Credit Facility, Maximum Borrowing Capacity Interest Rate Line of Credit Facility, Interest Rate at Period End Number of extensions available Line Of Credit Facility, Number Of Extensions Available Line Of Credit Facility, Number Of Extensions Available Extension term Line Of Credit Facility, Extension Term Line Of Credit Facility, Extension Term Changes In Equity And Comprehensive Income [Table] Changes In Equity And Comprehensive Income [Table] Changes In Equity And Comprehensive Income [Table] “At the market” equity program At The Market Equity Distribution Agreement [Member] At The Market Equity Distribution Agreement [Member] 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] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding 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. Aggregate offering price Aggregate Offering Price Of Common Share Aggregate offering price of common share. Number of sales agents Number Of Sales Agents Number Of Sales Agents Common stock sold (in shares) Stock Issued During Period, Shares, New Issues Average sales price (in dollars per share) Common Stock Issued During Period Average Price Per Share Common Stock Issued During Period Average Price Per Share Net proceeds from sale of stock Proceeds from Issuance of Common Stock 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 Secured notes payable Secured Loan With Bank [Member] Secured Loan With Bank [Member] Unsecured notes payable Unsecured Loan With Bank [Member] Unsecured Loan With Bank [Member] Fixed rate notes payable Long-term Debt, Percentage Bearing Fixed Interest, Amount Variable rate notes payable Long-term Debt, Percentage Bearing Variable Interest, Amount Notes payable, net Notes Payable Fixed Rate Debt Instrument, Interest Rate, Stated Percentage Variable Rate Debt, Weighted Average Interest Rate Basis spread on variable rate Real Estate [Abstract] Property Acquisition And Dispositions [Table] Property Acquisitions And Dispositions [Table] Property Acquisitions And Dispositions [Table] Storage Portfolio II JV LLC Storage Portfolio II JV LLC [Member] Storage Portfolio II JV LLC [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Disposal of California Store Disposal Of California Store, August 16, 2018 [Member] Disposal Of California Store, August 16, 2018 [Member] Disposal of 36 Stores Located in Various States Disposal of 36 Stores Located in Various States [Member] Disposal of 36 Stores Located in Various States [Member] Disposal of New York Land Disposal of New York Land, September 13, 2017 [Member] Disposal of New York Land, September 13, 2017 [Member] Disposal of Indiana Store Disposal Of Indiana Store, July 26,2016 [Member] Disposal Of Indiana Store, July 26,2016 [Member] Disposal of Ohio and Indiana Stores Disposal Of Ohio And Indiana Stores, April 20, 2016 [Member] Disposal Of Ohio And Indiana Stores, April 20, 2016 [Member] Disposal of Texas Store Disposal Of Texas Store, April 1, 2016 [Member] Disposal Of Texas Store, April 1, 2016 [Member] Real Estate Property Ownership [Axis] Real Estate Property Ownership [Axis] Real Estate Properties [Domain] Real Estate Properties [Domain] Acquisition of Stores in New Jersey and Virginia New Jersey And Virginia Five Stores Acquired In Two Thousand And Fourteen [Member] New Jersey And Virginia Five Stores Acquired In Two Thousand And Fourteen [Member] Property Acquisitions [Line Items] Property Acquisitions and Dispositions [Line Items] Property Acquisitions and Dispositions [Line Items] Proceeds from sale of real estate assets, investments in real estate ventures and other assets Proceeds from Sale of Other Real Estate Gain (loss) on disposition of assets Gain (Loss) on Disposition of Assets Number of stores sold Number of Stores Sold Number of stores purchased. Equity ownership % Equity Method Investment, Ownership Percentage Percentage of gain received on disposition Percentage Of Gain Recognized On Disposition Percentage Of Gain Recognized On Disposition Percentage of gain deferred on disposition Percentage Of Gain Deferred On Disposition Percentage Of Gain Deferred On Disposition OP Units received on disposal (in shares) Disposal Group, Including Discontinued Operation, Consideration, Partner Capital Units Disposal Group, Including Discontinued Operation, Consideration, Partner Capital Units Value of OP Units received on disposal Disposal Group, Including Discontinued Operation, Consideration Number of stores acquired Number Of Operating Stores Business Acquired Number of operating stores business acquired. Increase in payments due to sellers Increase In Payments Due To Sellers Increase in payments due to sellers. Schedule of Liabilities and Maximum Exposure to Loss Related to Trusts Variable Interest Entity, Not Primary Beneficiary, Comparison of Carrying Amount of Liabilities to Maximum Loss Exposure [Table Text Block] A tabular disclosure of the carrying amounts of liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the subsidiaries of the operating partnership and the reporting entity's maximum exposure to loss as a result of its involvement with the VIE. Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring Fair Value, Measurements, Recurring [Member] 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] Other assets - Cash Flow Hedge Swap Agreements Interest Rate Cash Flow Hedge Asset at Fair Value Other liabilities - Cash Flow Hedge Swap Agreements Interest Rate Cash Flow Hedge Liability at Fair Value Related Party and Affiliated Real Estate Joint Venture Transactions Related Party Transactions Disclosure [Text Block] Schedule of Supplementary Quarterly Financial Data Quarterly Financial Information [Table Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Buildings, improvements and other intangibles Building and Building Improvements [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Estimated useful life Property, Plant and Equipment, Useful Life 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. 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. Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Management Services Agreements (MSA) Management Services Agreements (MSA) [Member] Management Services Agreements (MSA) [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Contract term Revenue From Contract With Customer, Contract Term Revenue From Contract With Customer, Contract Term 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. 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. 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. 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. Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Stock option activity Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Balance at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Balance at the end of the period (in shares) Vested and Expected to Vest (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Exercisable at the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Balance at the beginning of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Balance at the end of the period (in dollars per share) 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 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 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] Outstanding at the beginning of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 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 Exercisable at the end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 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] Outstanding at the end of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Vested and Expected to Vest at the end of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Exercisable at the end of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Restricted Stock Restricted Stock [Member] Restricted Stock Grants Released (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Cancelled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Weighted-Average Grant-Date Fair 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 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 Number of nonconsolidated VIEs to which Operating Partnership has notes payable (in number of entities) Variable Interest Entity Not Primary Beneficiary Number And Not Consolidated Number The number of Variable Interest Entities (VIE) which are not included in the consolidated financial statements of the entity because the entity does not have a controlling financial interest (not the primary beneficiary). Schedule of Future Minimum Rental Payments Under Non-Cancelable Operating Lease Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Financial Information of Business Segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Investments in Unconsolidated Real Estate Ventures Equity Method Investments and Joint Ventures Disclosure [Text Block] Noncontrolling Interests In Operating Partnership and Other Noncontrolling Interests Equipment and fixtures Equipment And Fixtures [Member] Equipment And Fixtures [Member] Schedule of Components of Notes Payable Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Maturities of Notes Payable Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Information on Lines of Credit Schedule of Line of Credit Facilities [Table Text Block] Cost of operations Income from operations Net income attributable to common stockholders Net Income (Loss) Attributable to Parent Earnings per common share-basic (in dollars per share) Earnings Per Share, Basic Earnings per common share-diluted (in dollars per share) Earnings Per Share, Diluted Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Statement of Financial Position [Abstract] Preferred stock, par value (in dollars per share) Retirement Benefits [Abstract] 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. Matching contributions made by the entity during the period Defined Contribution Plan, Cost 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. 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. 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. 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. Line of Credit Line of Credit [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Tranche 1 Term Loan Facility Tranche 1 Term Loan Facility [Member] Tranche 1 Term Loan Facility [Member] Tranche 2 Term Loan Facility Tranche 2 Term Loan Facility [Member] Tranche 2 Term Loan Facility [Member] Base rate Base Rate [Member] Federal funds rate Federal Funds Effective Swap Rate [Member] Eurodollar Eurodollar [Member] Variable Rate Component [Axis] Variable Rate Component [Axis] Variable Rate Component [Axis] Variable Rate Component [Domain] Variable Rate Component [Domain] [Domain] for Variable Rate Component [Axis] Based on Company's Consolidated Leverage Ratio and type of loan Consolidated Leverage Ratio And Type Of Loan [Member] Consolidated Leverage Ratio And Type Of Loan [Member] If Company elects to use alternative rates based on specified investment grade rating Specified Investment Grade Rating And Elects To Use Alternative Rates [Member] Specified Investment Grade Rating And Elects To Use Alternative Rates [Member] Maximum borrowing capacity Term Debt Instrument, Term Increase limit Line of Credit Facility, Accordion Feature, Increase Limit Line of Credit Facility, Accordion Feature, Increase Limit Number of extension options Debt Instrument, Number of Extension Periods Debt Instrument, Number of Extension Periods Notes payable subject to recourse Recourse Debt Principal Amount Represents the principal amount of recourse debt due to guarantees at the balance sheet date. Exchangeable Senior Notes Principal amount repurchased Debt Instrument, Repurchased Face Amount Extinguishment of liability component Extinguishment of Debt, Amount Reacquisition of equity component Debt Instrument, Repurchase of Equity Component Debt instrument, repurchase of equity component. Total consideration paid for repurchase Repayments of Debt Extinguishment of liability component Discount on exchangeable senior notes Debt Instrument, Unamortized Discount Related debt issuance costs Gain/(loss) on repurchase Gain (Loss) on Repurchase of Debt Instrument Gain to be reclassified as a decrease to interest expense in 2019 Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Number of derivative financial instruments Derivative, Number of Instruments Held Combined notional amount Derivative, Notional Amount 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 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 Effective Income Tax Rate Reconciliation, Amount [Abstract] Effective Income Tax Rate Reconciliation, Amount [Abstract] Expected tax at statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Non-taxable REIT income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount State and local tax expense - net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Tax credits/true-up Income Tax Reconciliation Tax Credits Adjustments Income Tax Reconciliation Tax Credits Adjustments Remeasurement of deferred balances Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Miscellaneous Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Total provision Effective Income Tax Rate Reconciliation, Percent [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Expected tax at statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Non-taxable REIT income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent State and local tax expense - net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Tax credits/true-up Effective Income Tax Rate Reconciliation Tax Credits Adjustments Effective income tax rate reconciliation tax credits adjustments. Remeasurement of deferred balances Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Miscellaneous Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Total provision Effective Income Tax Rate Reconciliation, Percent Schedule of Operating Properties Acquired Schedule of Asset Acquisitions [Table Text Block] Schedule of Asset Acquisitions [Table Text Block] Investment Balance Investments In Trusts Represents the carrying value of investments made by the entity in trusts. Maximum exposure to loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Difference Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure 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] 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. Summary of Repurchase of Debt Schedule of Debt Repurchase [Table Text Block] Schedule of Debt Repurchase [Table Text Block] Summary of Stock Option Activity Share-based Compensation, Stock Options, Activity [Table Text Block] 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] Schedule of Stock Options Outstanding and Exercisable Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Summary of Company's Employee and Director Share Grant Activity Schedule of Nonvested Share Activity [Table Text Block] Schedule of Nonvested Performance-based Units Activity Schedule of Nonvested Performance-based Units Activity [Table Text Block] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] WICNN JV LLC WICNN JV LLC [Member] WICNN JV LLC [Member] VRS Self Storage, LLC Vrs Self Storage LLC [Member] Vrs Self Storage LLC [Member] PRISA Self Storage LLC Prisa Self Storage LLC [Member] Prisa Self Storage LLC [Member] Alan Jathoo JV LLC Alan Jathoo JV LLC [Member] Alan Jathoo JV LLC [Member] Extra Space West Two LLC (1) Extra Space West Two LLC [Member] Extra Space West Two LLC [Member] ESS Bristol Investments LLC ESS Bristol Investments, LLC [Member] ESS Bristol Investments, LLC [Member] WCOT Self Storage LLC Wcot Self Storage LLC [Member] Wcot Self Storage LLC [Member] Extra Space West One LLC (1) Extra Space West One LLC [Member] Extra Space West One LLC [Member] Extra Space Northern Properties Six LLC Extra Space Northern Properties Six LLC [Member] Extra Space Northern Properties Six LLC [Member] Storage Portfolio I LLC Storage PortfolioI LLC [Member] Storage PortfolioI LLC [Member] Other minority owned stores Other Minority Owned Properties [Member] Other Minority Owned Properties [Member] Extra Space West One LLC and Extra Space Two LLC Extra Space West One And Two LLC [Member] Extra Space West One And Two LLC [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Number of Stores Equity Method Investment, Number Of Properties Equity Method Investment, Number Of Properties Equity Ownership % Excess Profit % Unconsolidated Joint Ventures Excess Profit Participation Percentage The percentage of excess profit participation in unconsolidated joint ventures. Net Investments in and Cash distributions in unconsolidated real estate ventures Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures, Net Of Distributions Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures, Net Of Distributions Number of joint ventures, not significant for separate disclosure Number Of Equity Method Investments, Not Significant For Separate Disclosure Number Of Equity Method Investments, Not Significant For Separate Disclosure Number of stores acquired Number Of Real Estate Properties Acquired Represents the number of real estate properties acquired. Cash paid to acquire properties Payments To Acquire Assets, Gross Payments To Acquire Assets, Gross Loan assumed Noncash or Part Noncash Acquisition, Debt Assumed Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Joint venture one Joint Venture One [Member] Joint Venture One [Member] Common Stock Common Stock [Member] Other Non Controlling Interest Other [Member] Non Controlling Interest Other [Member] Ownership [Axis] Ownership [Axis] Ownership [Domain] Ownership [Domain] Ownership interest held by entity (as a percent) Noncontrolling Interest, Ownership Percentage by Parent Voting interests of third-party owners Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 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. Unit conversion ratio Shareholders' Equity, Units Conversion Ratio Shareholders' Equity, Units Conversion Ratio 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. OP units outstanding (in units) Units of Partnership Interest, Amount 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. Number of consolidated joint ventures Real Estate Consolidated Join Ventures Number Represents the number of consolidated joint ventures as of the balance sheet date. Number of owned stores Number Of Operating Stores Owned Number Of Operating Stores Owned Statement of Stockholders' Equity [Abstract] Dividends paid on common stock (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid GFV JV, LLC GFV JV, LLC [Member] GFV JV, LLC [Member] Number of Stores Investment in new stores Equity Method Investment, Aggregate Cost Number of new joint ventures with preferred equity investment Equity Method Investment, New Unconsolidated Joint Ventures With Preferred Equity Interest, Number Equity Method Investment, New Unconsolidated Joint Ventures With Preferred Equity Interest, Number Joint venture preferred equity investment Equity Method Investment, Preferred Equity Interest Equity Method Investment, Preferred Equity Interest 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 Income Tax [Table] Income Tax [Table] Income Tax [Table] Extra Space Management, Inc Extra Space Management, Inc [Member] Extra Space Management, Inc [Member] Income Tax [Line Items] Income Tax [Line Items] [Line Items] for Income Tax [Table] Number of taxable REIT subsidiaries Number of Taxable REIT Subsidiaries Number of Taxable REIT Subsidiaries Tax benefit related to remeasurment of deferred tax balance and valuation allowance Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Income Tax Expense (Benefit) Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Income Tax Expense (Benefit) 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. Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Average expected term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Property Acquisitions and Dispositions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Derivative [Table] Derivative [Table] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Cash flow hedging Cash Flow Hedging [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Swap Agreements Interest Rate Swap [Member] Derivative [Line Items] Derivative [Line Items] Notional amounts Strike rate Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other assets Other Assets [Member] Other liabilities Other Liabilities [Member] Asset Derivatives Liability Derivatives Number of operating stores classified as held for sale Number of Operating Stores Owned Held-For-Sale Number of Operating Stores Owned Held-For-Sale Number of parcels of land classified as held for sale Number Of Parcels Of Land Held-For-Sale Number Of Parcels Of Land Held-For-Sale Average period that a tenant is expected to utilize the facility Finite-Lived Intangible Asset, Useful Life Amortization related to the tenant relationships and lease rights Amortization of Intangible Assets Schedule of Real Estate Properties [Table] Schedule of Real Estate Properties [Table] Real Estate Properties [Line Items] Real Estate Properties [Line Items] Remaining amortization period Finite-Lived Intangible Assets, Remaining Amortization Period Intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Organization, Consolidation and Presentation of Financial Statements [Abstract] DESCRIPTION OF BUSINESS Nature of Operations [Text Block] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract] Schedule III - Real Estate and Accumulated Depreciation SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Text Block] Options Employee Stock Option [Member] Shares available for issuance under plans (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Weighted average fair value of stock options granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Options granted (in shares) 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. Compensation cost Allocated Share-based Compensation Expense Net proceeds from exercise of stock options Proceeds from Stock Options Exercised Unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Term over which unrecognized compensation cost recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 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 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 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 Dividend yield Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Noncash or Part Noncash Acquisitions by Unique Description [Axis] Noncash or Part Noncash Acquisitions by Unique Description [Axis] Noncash or Part Noncash Acquisition, Name [Domain] Noncash or Part Noncash Acquisition, Name [Domain] Acquisitions of real estate assets Acquisitions Of Real Estate [Member] Acquisitions Of Real Estate [Member] Operating Partnership units redeemed Redemption Of Operating Partnership Units [Member] Redemption Of Operating Partnership Units [Member] Acquisition of noncontrolling interests Acquisition Of Other Noncontrolling Interests [Member] Acquisition Of Other Noncontrolling Interests [Member] Statement [Line Items] Statement [Line Items] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Amortization of deferred financing costs Amortization of Debt Issuance Costs 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 Non-cash interest expense related to amortization of premium on notes payable Amortization Of Debt Discount (Premium), Notes Payable Amortization Of Debt Discount (Premium), Notes Payable Compensation expense related to stock-based awards Share-based Compensation Gain on sale of real estate assets and purchase of joint venture partners' interests Gain Loss On Sale Of Real Estate Assets And Purchase Of Joint Venture Partners Interests Gain or loss included in earnings resulting from the difference between the carrying value and the sale price of real estate and the gain or loss recorded as a result of the purchase of joint venture partnership interests in a step acquisition. Gain on real estate transactions, earnout on prior acquisitions and impairment of real estate Gains Losses On Real Estate Transactions and Earn Out From Prior Acquisition Gains Losses On Real Estate Transactions and Earn Out From Prior Acquisition Distributions from unconsolidated real estate ventures in excess of earnings Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Other assets Increase (Decrease) in Other Operating Assets Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Other liabilities Increase (Decrease) in Other Operating Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Acquisition of real estate assets Payments to Acquire Real Estate Development and redevelopment of real estate assets Payments to Develop Real Estate Assets Investment in unconsolidated real estate ventures Payments to Acquire Equity Method Investments 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. Issuance of notes receivable Payments to Acquire Notes Receivable Principal payments received from notes receivable Proceeds from Collection of Notes Receivable Purchase of equipment and fixtures Payments to Acquire Furniture and Fixtures Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Proceeds from the sale of common stock, net of offering costs Proceeds from notes payable and revolving lines of credit Proceeds from Issuance of Secured Debt Principal payments on notes payable and revolving lines of credit Principal payments on notes payable to trusts Deferred financing costs Payments of Financing Costs Repurchase of exchangeable senior notes Repayments of Debt Instruments The cash outflow to repay fair value of debt instruments. Proceeds from termination of interest rate cap Proceeds from Derivative Instrument, Financing Activities Payment of earnout from prior acquisition Payments for Previous Acquisition 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. Contributions from noncontrolling interests Proceeds from Noncontrolling Interests Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Distributions to noncontrolling interests Payments of Ordinary Dividends, Noncontrolling Interest Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash, cash equivalents, and restricted cash, beginning of the period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents, and restricted cash end of the period Supplemental schedule of cash flow information Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Income taxes paid Income Taxes Paid Supplemental schedule of noncash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] 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] Noncontrolling interests in Operating Partnership Conversion of Stock, Amount Converted 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. Tax effect from vesting of restricted stock grants and option exercises Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net [Abstract] Other assets Proceeds and Excess Tax Benefit from Share-based Compensation Additional paid-in capital Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net 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] Real estate assets 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. Value of Operating Partnership units issued Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Notes payable assumed Investment in unconsolidated real estate ventures Noncash Or Part Noncash Acquisition, Real Estate Assets, Investment In Unconsolidated Real Estate Ventures Noncash Or Part Noncash Acquisition, Real Estate Assets, Investment In Unconsolidated Real Estate Ventures Other noncontrolling interests Increase Of Other Noncontrolling Interest Due To Acquisitions Increase Of Other Noncontrolling Interest Due To Acquisitions Accrued construction costs and capital expenditures Accrued Construction Costs And Capital Expenditures [Abstract] Accrued Construction Costs And Capital Expenditures [Abstract] Acquisition of real estate assets Real Estate Additions, Portion Not Yet Paid Real Estate Additions, Portion Not Yet Paid Development and redevelopment of real estate assets Construction In Progress Additions, Portion Not Yet Paid Construction In Progress Additions, Portion Not Yet Paid Accounts payable and accrued expenses Construction In Progress And Capital Expenditures Incurred But Not Paid Construction In Progress And Capital Expenditures Incurred But Not Paid Distribution of real estate from investments in unconsolidated real estate ventures Distribution of Real Estate from Investments in Unconsolidated Real Estate Ventures [Abstract] Distribution of Real Estate from Investments in Unconsolidated Real Estate Ventures [Abstract] Real estate assets, net Contribution of Property Investments in unconsolidated real estate ventures Transfer from Investments Disposition of real estate assets Disposition Of Real Estate Assets [Abstract] Disposition Of Real Estate Assets [Abstract] Real estate assets, net Noncash or Part Noncash Divestiture, Amount of Consideration Received Operating Partnership units redeemed Other Significant Noncash Transaction, Value of Consideration Given Acquisition of noncontrolling interests Acquisition Of Other Noncontrolling Interests [Abstract] Acquisition Of Other Noncontrolling Interests [Abstract] Operating Partnership units issued Noncash Or Part Noncash Acquisition, Value Of Consideration Given Noncash Or Part Noncash Acquisition, Value Of Consideration Given Other noncontrolling interests Noncash Or Part Noncash Acquisition, Other Noncontrolling Interests Noncash Or Part Noncash Acquisition, Other Noncontrolling Interests Additional paid-in capital Noncash Or Part Noncash Acquisition, Additional Paid In Capital Noncash Or Part Noncash Acquisition, Additional Paid In Capital Issuance of Preferred OP Units for additional investment in unconsolidated real estate venture Issuance of Preferred OP Units for additional investment in unconsolidated real estate venture [Abstract] Issuance of Preferred OP Units for additional investment in unconsolidated real estate venture [Abstract] Preferred OP Units issued Stock Issued Investment in unconsolidated real estate ventures Investments In Unconsolidated Real Estate Ventures Acquired, Contribution Investments In Unconsolidated Real Estate Ventures Acquired, Contribution Tenant Reinsurance Claims: Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Unpaid claims liability at beginning of year Liability for Claims and Claims Adjustment Expense Claims and claim adjustment expense for claims incurred in the current year Current Year Claims and Claims Adjustment Expense Claims and claim adjustment expense (benefit) for claims incurred in the prior years Prior Year Claims and Claims Adjustment Expense Payments for current year claims Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Payments for prior year claims Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Unpaid claims liability at the end of the year Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Swap Agreements Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Gain (loss) recognized in OCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Gain (loss) reclassified from OCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax ESS WCOT LLC ESS WCOT LLC Joint Venture [Member] ESS WCOT LLC Joint Venture [Member] ESS PRISA II LLC ESS PRISA II LLC Joint Venture [Member] ESS PRISA II LLC Joint Venture [Member] Extra Space Properties 131 LLC Extra Space Properties One Three One LLC [Member] Extra Space Properties One Three One LLC [Member] ESS PRISA LLC and ESS PRISA II LLC ESS PRISA LLC And ESS PRISA TWO LLC [Member] ESS PRISA LLC And ESS PRISA TWO LLC [Member] ESS PRISA LLC ESS PRISA LLC [Member] ESS PRISA LLC [Member] ESS Prisa II LLC ESS Prisa Two LLC [Member] ESS Prisa Two LLC [Member] VRS Self Storage LLC VRS Self Storage LLC Joint Venture [Member] VRS Self Storage LLC Joint Venture [Member] Extra Space Properties 122 LLC Extra Space Properties One Two Two LLC [Member] Extra Space Properties 122 LLC [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Prudential Real Estate and Affiliates Prudential Real Estate and Affiliates [Member] Prudential Real Estate and Affiliates [Member] Properties acquired September 2016 Various States Properties Sept16,2016 [Member] Various States Properties Sept16,2016 [Member] Number of acquired stores Number of Acquired Stores Number of acquired stores. Percentage interests acquired Business Acquisition, Percentage of Voting Interests Acquired Net carrying amount of properties distributed Net Carrying Amount Of Properties Distributed Net carrying amount of properties distributed. Payment to acquire joint venture interests Asset Acquisition Amount Paid To Acquire Joint Venture Partners Interests Asset Acquisition Amount Paid To Acquire Joint Venture Partners Interests Ownership percentage after transaction Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage Fair value of investment prior to acquisition of additional interest Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value Gain recorded as a result of remeasuring fair value of existing equity interest Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain Fair value of stores purchased Real Estate Property Acquisition, Assets Acquired Real estate property acquisition, assets acquired. Number of transferred stores Number of Transferred Stores Number of transferred stores. Number of stores owned Number of Stores Owned Number of Stores Owned Ownership percentage sold Equity Method Investment, Ownership Percentage Sold Equity Method Investment, Ownership Percentage Sold Proceeds from sale of interest Proceeds from Sale of Equity Method Investments Carrying value of investment prior to acquisition Equity Method Investment, Amount Sold Realized gain on sale Equity Method Investment, Realized Gain (Loss) on Disposal Unconsolidated joint ventures excess profit participation percentage forfeited Unconsolidated Joint Ventures Excess Profit Participation Percentage Forfeited Unconsolidated Joint Ventures Excess Profit Participation Percentage Forfeited Amortization amount of excess purchase price included in equity earnings Equity Method Investment, Difference Between Carrying Amount and Underlying Equity 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. Income Statement [Abstract] Revenues: Revenues [Abstract] Property rental Operating Leases, Income Statement, Minimum Lease Revenue Tenant reinsurance Direct Premiums Earned Total revenues Expenses: Costs and Expenses [Abstract] Property operations Cost of Revenue Tenant reinsurance Tenant Reinsurance Expense The expense in the period incurred with respect to the entity's tenant reinsurance program. Acquisition related costs and other Acquisition Related Costs The costs incurred during the period to purchase real estate assets, including brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. General and administrative Total expenses Gain on real estate transactions, earnout on prior acquisitions and impairment of real estate Interest expense Interest income 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 Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests Net income allocated to Preferred Operating Partnership noncontrolling interests Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable 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. Net income attributable to common stockholders Earnings per common share Earnings Per Share, Basic and Diluted [Abstract] Basic (in dollars per share) Diluted (in dollars per share) Weighted average number of shares Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Subsequent Event [Table] Subsequent Event [Table] Subsequent Event [Line Items] Subsequent Event [Line Items] Equity in earnings Less than 1 year Operating Leases, Future Minimum Payments Due, Next Twelve Months Year 2 Operating Leases, Future Minimum Payments, Due in Two Years Year 3 Operating Leases, Future Minimum Payments, Due in Three Years Year 4 Operating Leases, Future Minimum Payments, Due in Four Years Year 5 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due 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] Schedule of Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule of Unpaid Claims Liability Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] 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] Schedule of Computation of Earnings Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Earnings and dividends allocated to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Earnings for basic computations Net Income (Loss) Available to Common Stockholders, Basic Earnings and dividends allocated to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted 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 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. Net income for diluted computations Net Income (Loss) Available to Common Stockholders, Diluted Weighted average common shares outstanding: Average number of common shares outstanding - basic (in shares) 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. 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] 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] Series A&D 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. Unvested restricted stock awards included for treasury stock method (in shares) Incremental Common Shares Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends 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. Average number of common shares outstanding - diluted (in shares) Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Anti-dilutive securities excluded from computation of earnings per common share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Average share price (in dollars per share) Average Share Price Per Share Average Share Price Per Share Exchangeable senior notes Fixed interest rate Exchange price (in dollars per share) Debt Instrument, Convertible, Conversion Price 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 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. Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Segment Information Segment Reporting Disclosure [Text Block] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] 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] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Real Estate [Domain] Real Estate [Domain] Self Storage Facility Self Storage Facility [Member] Self Storage Facility [Member] Other Corporate Assets Other Corporate Assets [Member] Other Corporate Assets [Member] Intangible tenant relationships and lease rights Intangible Tenant Relationships And Lease Rights [Member] Intangible Tenant Relationships And Lease Rights [Member Construction in Progress/Undeveloped Land Construction In Progress And Undeveloped Land [Member] Construction In Progress And Undeveloped Land [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] AL ALABAMA AZ ARIZONA CA CALIFORNIA CO COLORADO CT CONNECTICUT FL FLORIDA GA GEORGIA HI HAWAII IL ILLINOIS IN INDIANA KS KANSAS KY KENTUCKY LA LOUISIANA MA MASSACHUSETTS MD MARYLAND MI MICHIGAN MN MINNESOTA MO MISSOURI MS MISSISSIPPI NC NORTH CAROLINA NH NEW HAMPSHIRE NJ NEW JERSEY NM NEW MEXICO NV NEVADA NY NEW YORK OH OHIO OR OREGON PA PENNSYLVANIA RI RHODE ISLAND SC SOUTH CAROLINA TN TENNESSEE TX TEXAS UT UTAH VA VIRGINIA DC WASHINGTON DC DISTRICT OF COLUMBIA 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] Store Count SEC Schedule III, Real Estate and Accumulated Depreciation, Number of Stores SEC Schedule III, Real Estate and Accumulated Depreciation, Number of Stores Debt Debt and Capital Lease Obligations Land Initial Cost SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Land 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 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 Gross carrying amount - Land SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Land, Amount Gross carrying amount - Building and improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Building and Improvements, Amount Gross carrying amount - Total SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross Accumulated Depreciation SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation Number of storage facilities in which the entity had equity interests Number of Real Estate Properties 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. 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. Number of states in which storage facilities are located Number of States in which Entity Operates Intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested Risk-free rate Volatility Expected term Land - operating Land [Member] Land - development Land Development [Member] Land Development [Member] Intangible assets - tenant relationships Tenant Relationships [Member] Tenant Relationships [Member] Intangible lease rights Lease Rights [Member] Lease Rights [Member] Real estate assets, at cost Real Estate Investment Property, at Cost Less: accumulated depreciation and amortization 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. Real estate under development/redevelopment Development in Process Net real estate assets Real Estate Investment Property, Net Real estate assets held for sale included in net real estate assets Real Estate Held-for-sale Employee Benefit Plan Pension and Other Postretirement Benefits Disclosure [Text Block] Assets: Assets [Abstract] Real estate assets, net Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents Other assets, net Other Assets Total assets Assets Liabilities, Noncontrolling Interests and Equity: Liabilities and Equity [Abstract] Notes payable, net Exchangeable senior notes, net Notes payable to trusts, net Notes Payable To Trusts Aggregate carrying amount of all notes payable to trusts as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. Revolving lines of credit Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Other liabilities Other Liabilities Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Noncontrolling Interests and Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Extra Space Storage Inc. stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.01 par value, 50,000,000 shares authorized, no shares issued or outstanding Preferred Stock, Value, Issued Common stock, $0.01 par value, 500,000,000 shares authorized, 127,103,750 and 126,007,091 shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated deficit Retained Earnings (Accumulated Deficit) Total Extra Space Storage Inc. stockholders' equity Stockholders' Equity Attributable to Parent Noncontrolling interest represented by Preferred Operating Partnership units, net Noncontrolling Interest in Preferred Unit Holders Noncontrolling interests in Operating Partnership, net and other noncontrolling interests Noncontrolling Interest in Operating Partnerships Total noncontrolling interests and equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities, noncontrolling interests and equity Liabilities and Equity Other Commitments [Table] Other Commitments [Table] Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Commitment to acquire stores Commitment To Acquire Retail Space [Member] Commitment To Acquire Retail Space [Member] Commitment to acquire stores, 2019 Commitment To Acquire Retail Space, Expected To Close Next Fiscal Year [Member] Commitment To Acquire Retail Space, Expected To Close Next Fiscal Year [Member] Commitment to acquire stores, 2020 Commitment To Acquire Retail Space, Expected To Close In Year Two [Member] Commitment To Acquire Retail Space, Expected To Close In Year Two [Member] 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] Commitment to acquire stores with joint venture partners, 2019 Commitment To Acquire Retail Space With Joint Venture Partners, Expected To Close Next Fiscal Year [Member] Commitment To Acquire Retail Space With Joint Venture Partners, Expected To Close Next Fiscal Year [Member] Commitment to acquire stores with joint venture partners, 2020 Commitment To Acquire Retail Space With Joint Venture Partners, Expected To Close Year Two [Member] Commitment To Acquire Retail Space With Joint Venture Partners, Expected To Close Year Two [Member] Other Commitments [Line Items] Other Commitments [Line Items] Number of owned stores that have leases Real Estate Self Storage Properties Ground Leases Number Represents the number of self-storage properties that have ground leases as of the balance sheet date. Expense related to ground leases Operating Leases, Rent Expense, Net Number of properties to be acquired Number Of Real Estate Properties To Be Acquired Number Of Real Estate Properties To Be Acquired Other commitment Other Commitment 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. Common OP Units Common Operating Partnership Units [Member] Common Operating Partnership Units [Member] Series A Units (Variable Only) Equivalent Shares (if converted) (in shares) Number Of Preferred Operating Partnership Units Represents the number of Preferred Operating Partnership units outstanding at the balance sheet date that are excluded from the earnings per share computation as their effect would have been anti-dilutive. Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Carrying Value Reported Value Measurement [Member] Fair Value of Financial Instruments [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] 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). Fixed rate notes receivable Notes Receivable, Fair Value Disclosure Fixed rate notes payable and notes payable to trusts Notes Payable, Fair Value Disclosure Exchangeable senior notes Convertible Debt, Fair Value Disclosures Real Estate Assets Real Estate Disclosure [Text Block] Preferred Operating Partnership, Series A Series A Preferred Operating Partnership [Member] Series A Preferred Operating Partnership [Member] Preferred Operating Partnership, Series B Series B Preferred Operating Partnership [Member] Series B Preferred Operating Partnership [Member] Preferred Operating Partnership, Series D Series D Preferred Operating Partnership [Member] Series D Preferred Operating Partnership [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Accumulated Other Comprehensive Income AOCI Attributable to Parent [Member] Accumulated Deficit Retained Earnings [Member] Redemption of Operating Partnership units for sale of property Redemption Of Units For Sale Of Property [Member] Redemption Of Units For Sale Of Property [Member] Redemption of Operating Partnership units for common stock and cash Redemption Of Units For Common Stock And Cash [Member] Redemption Of Units For Common Stock And Cash [Member] Redemption of Operating Partnership units for cash Redemption Of Units For Cash [Member] Redemption Of Units For Cash [Member] Redemption of Operating Partnership units for stock Redemption Of Units For Common Stock [Member] Redemption Of Units For Common Stock [Member] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance Beginning balance (in shares) Issuance of common stock upon the exercise of options (in shares) Issuance of common stock upon the exercise of options Stock Issued During Period, Value, Stock Options Exercised Restricted stock grants issued (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Restricted stock grants issued Stock Issued During Period, Value, Restricted Stock Award, Gross Restricted stock grants cancelled (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Issuance of common stock, net of offering costs (in shares) Issuance of common stock, net of offering costs Stock Issued During Period, Value, New Issues Compensation expense related to stock-based awards Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition 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 Issuance of Operating Partnership units in conjunction with acquisitions Partners' Capital Account, Acquisitions Redemption or purchase of noncontrolling interests Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Redemption of Operating Partnership units (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. 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 Issuance of Preferred D Units in the Operating Partnership in conjunction with acquisitions Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt 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 Repurchase of equity portion of 2013 exchangeable senior notes (in shares) Stock Repurchased During Period, Shares Repurchase of equity portion of 2013 exchangeable senior notes Stock Repurchased During Period, Value Net income (loss) Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Tax effect from vesting of restricted stock grants and stock option exercises Distributions to Operating Partnership units held by noncontrolling interests Partners' Capital Account, Distributions Dividends paid on common stock Dividends, Common Stock Ending balance Ending balance (in shares) 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 OP Units redeemed for cash (in shares) Noncontrolling Interest, Operating Partnership Units Redeemed For Cash Noncontrolling Interest, Operating Partnership Units Redeemed For Cash Cash paid for OP Units redeemed Noncontrolling Interest, Operating Partnership Units Redeemed, Cash Paid Noncontrolling Interest, Operating Partnership Units Redeemed, Cash Paid 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 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 Federal Federal Income Tax Expense (Benefit), Continuing Operations [Abstract] Current expense, federal Current Federal Tax Expense (Benefit) 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. Change in deferred expense/(benefit), federal Deferred Federal Income Tax Expense (Benefit) Income tax expense, federal Federal Income Tax Expense (Benefit), Continuing Operations State State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract] Current expense, state Current State and Local Tax Expense (Benefit) Tax credits/true-up, state Income Tax Credits And Adjustments State Income Tax Credits And Adjustments State Change in deferred expense/(benefit), state Deferred State and Local Income Tax Expense (Benefit) Income tax expense, state State and Local Income Tax Expense (Benefit), Continuing Operations Current expense, total Current Income Tax Expense (Benefit) Tax credits/true-up, total Income Tax Credits and Adjustments Change in deferred expense/(benefit), total Deferred Income Tax Expense (Benefit) Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Smaller Reporting Company Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Number of stores Total Real Estate Property Asset Acquisition, Consideration Transferred Real Estate Property Asset Acquisition, Consideration Transferred Cash Paid Loan Assumed Non- controlling interests Real Estate Property Acquisition Of Less Than 100 Percent, Increase (Decrease) Noncontrolling Interest, Fair Value Real Estate Property Acquisition Of Less Than 100 Percent, Increase (Decrease) Noncontrolling Interest, Fair Value Investments in Real Estate Ventures Noncash or Part Noncash Acquisition, Investments In Unconsolidated Real Estate Ventures Acquired Noncash or Part Noncash Acquisition, Investments In Unconsolidated Real Estate Ventures Acquired 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. Value of OP Units Issued 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 Number of stores acquired, previously held equity interest Number Of Real Estate Properties Acquired, Previous Equity Interest Held Number Of Real Estate Properties Acquired, Previous Equity Interest Held Redeemable Noncontrolling Interest Redeemable Noncontrolling Interest [Table Text Block] Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Operating facilities Operating Facilities [Member] Operating Facilities [Member] Real estate under development/redevelopment Real Estate Under Development [Member] Real Estate Under Development [Member] Real estate, gross: SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] Balance at beginning of year Acquisitions Real Estate Acquisitions Real Estate Acquisitions Improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Improvements Current development Real Estate Current Development Real Estate Current Development Transfers from construction in progress (to operating facilities) Real Estate Transfers Net Real Estate Transfers Net Dispositions and other Real Estate Cost Of Real Estate Sold And Other Deductions Real estate cost of real estate sold and other deductions. Balance at end of year Accumulated depreciation: SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] Balance at beginning of year Depreciation expense SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Depreciation Expense Dispositions and other Real Estate Accumulated Depreciation Real Estate Sold And Other Deductions Real Estate Accumulated Depreciation Real Estate Sold And Other Deductions Balance at end of year Net real estate assets: SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract] 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 Principal amount of notes issued Debt Instrument, Face Amount Related debt issuance costs Underwriting fee percentage Percentage of Underwriting Fee Percentage of Underwriting Fee Amortization period Debt Issuance Cost Amortization Period Debt Issuance Cost Amortization Period Conversion ratio Debt Instrument, Convertible, Conversion Ratio Redemption price as percentage of principal amount of notes plus accrued and unpaid interest Debt Instrument, Redemption Price, Percentage 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. 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. Notes exchange, threshold percentage Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Notes exchange, threshold trading days Debt Instrument, Convertible, Threshold Trading Days Notes exchange, threshold consecutive trading days Debt Instrument, Convertible, Threshold Consecutive Trading Days Debt, measurement input Debt Instrument Discount Rate Represents the percentage of debt discount that was originally recognized at the issuance of the instrument. Unamortized cash discount Amortization period Variable Rate Debt Instrument, Interest Rate, Effective Percentage Cash paid for repurchase of debt Converted instrument, shares issued (in shares) Debt Conversion, Converted Instrument, Shares Issued Converted instrument, amount Debt Conversion, Converted Instrument, Amount