Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] 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. Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Net income for diluted computations Net Income (Loss) Available to Common Stockholders, Diluted Carrying Value Reported Value Measurement [Member] Document Fiscal Year Focus Document Fiscal Year Focus Weighted average interest rate Debt, Weighted Average Interest Rate Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Segment Reporting [Abstract] Segment Reporting [Abstract] Cash paid for OP Units redeemed Noncontrolling Interest, Operating Partnership Units Redeemed, Cash Paid Noncontrolling Interest, Operating Partnership Units Redeemed, Cash Paid Note receivable interest rate Notes Receivable Stated Interest Rate Represents the stated interest rate of notes receivable. Common stock, $0.01 par value, 500,000,000 shares authorized, 211,273,076 and 211,155,322 shares issued and outstanding at June 30, 2026 and December 31, 2025, respectively Common Stock, Value, Issued Schedule of Unsecured Senior Notes and Components of Debt Schedule of Long-Term Debt Instruments [Table Text Block] Restatement Determination Date Restatement Determination Date Derivative Instrument [Axis] Derivative Instrument [Axis] Amendment Flag Amendment Flag Average cost (dollars per share) Shares Acquired, Average Cost Per Share Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Less: accumulated depreciation and amortization Real Estate Investment Property, Accumulated Depreciation Storage Portfolio II JV LLC Storage Portfolio II JV LLC [Member] Storage Portfolio II JV LLC [Member] Investment in debt securities (in shares) Debt Securities, Held To Maturity, Number Of Shares Debt Securities, Held To Maturity, Number Of Shares Preferred Operating Partnership Preferred Operating Partnership [Member] Preferred Operating Partnership [Member] Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Number of operating stores held-for-sale Number Of Operating Stores Held For Sale Number Of Operating Stores Held For Sale Unsecured term loans Unsecured Term Loans [Member] Unsecured Term Loans Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (dollars per share) Common Stock, Par or Stated Value Per Share Asset Acquisition [Axis] Asset Acquisition [Axis] Combined notional amount Derivative, Notional Amount Weighted-average maturity term Debt Instrument, Weighted-Average Maturity Term Debt Instrument, Weighted-Average Maturity Term Basic (in shares) Average number of common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Tenant reinsurance Direct Premiums Earned Investments in Real Estate Ventures Asset Acquisition, Consideration Transferred, Investment In Real Estate Joint Ventures Asset Acquisition, Consideration Transferred, Investment In Real Estate Joint Ventures Number of reportable segments Number of Reportable Segments 2034 Long-Term Debt, Maturity, Year Eight Long-Term Debt, Maturity, Year Eight Gross operating real estate assets Real Estate Investment Property, at Cost JCAP Series B Preferred Stock JCAP Series B Preferred Stock [Member] JCAP Series B Preferred Stock Noncontrolling interest represented by Preferred Operating Partnership units Noncontrolling Interest in Preferred Unit Holders Entity Address, City or Town Entity Address, City or Town Total Real Estate Assets Asset Acquisition, Consideration Transferred Principal amount of notes sold Financing Receivable, Sale and Reclassification to Held-for-Sale Fixed rate to total debt percentage Debt Instrument, Fixed Rate Debt To Total Debt Rate Debt Instrument, Fixed Rate Debt To Total Debt Rate Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Other intangible assets, net Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Interest Rate Line of Credit Facility, Interest Rate at Period End Net income for basic computations Net Income (Loss) Available to Common Stockholders, Basic Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-Maturity [Table] 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. Receivable [Domain] Receivable [Domain] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] At the Market Equity Distribution Agreement At The Market Equity Distribution Agreement [Member] At The Market Equity Distribution Agreement [Member] Revolving credit facility, maximum borrowing capacity Capacity Line of Credit Facility, Maximum Borrowing Capacity Series D Units Series D Units [Member] Series D Units [Member] Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Aggregate offering price of common shares Aggregate Offering Price Of Common Share Aggregate offering price of common share. Subsequent Event Type [Axis] Subsequent Event Type [Axis] Change in fair value of interest rate swaps Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Notes receivable - bridge loans, net Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Gain (loss) on real estate assets held for sale and sold, net Gain (loss) on real estate assets held for sale and sold, net 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 Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Accounts payable and accrued expenses Capital Expenditures Incurred but Not yet Paid Schedule of Financial Information of Business Segments Segment Reporting [Table Text Block] Term Debt Term Debt [Member] Term Debt Amortization of deferred financing costs Amortization of Debt Issuance Costs Noncontrolling Interest Represented By Preferred Operating Partnership Units Noncontrolling Interests In Operating Partnership and Other Noncontrolling Interests Noncontrolling Interest Disclosure [Text Block] Repurchase of common stock, net of commissions paid Payments for Repurchase of Common Stock, Net Of Commissions Paid Payments for Repurchase of Common Stock, Net Of Commissions Paid Total Long-Term Debt Fixed rate notes receivable Notes Receivable, Fair Value Disclosure Intangible lease rights Real Estate Investment Property, Intangible Lease Rights Real Estate Investment Property, Intangible Lease Rights Supplemental schedule of noncash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Document Period End Date Document Period End Date Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Preferred stock, outstanding (in shares) Preferred Stock, Shares Outstanding Debt instrument, face amount Debt Instrument, Face Amount Purchase of equipment and fixtures Payments to Acquire Furniture and Fixtures OP Units redeemed for cash (in shares) Noncontrolling Interest, Operating Partnership Units Redeemed For Cash Noncontrolling Interest, Operating Partnership Units Redeemed For Cash Assets held for sale, disposals Real Estate, Held-for-Sale, Disposals Real Estate, Held-for-Sale, Disposals Stockholders' Equity Equity [Text Block] Expenses: Operating expenses Costs and Expenses [Abstract] Security Exchange Name Security Exchange Name Debt instrument, term Debt Instrument, Term (Gain) / Loss Recognized Assets Held For Sale , Number Of Stores [Roll Forward] Assets Held For Sale , Number Of Stores Debt securities, term Debt Securities Held To Maturity, Term Debt Securities Held To Maturity, Term Assumed Debt From Merger Assumed Debt From Merger [Member] Assumed Debt From Merger Repayment of receivable with Operating Partnership units pledged as collateral Noncontrolling Interest, Repayment of Receivable with Operating Partnership Units Pledged as Collateral Noncontrolling Interest, Repayment or Receivable with Operating Partnership Units Pledged as Collateral Fourth Amended and Restated Credit Agreement Fourth Amended and Restated Credit Agreement [Member] Fourth Amended and Restated Credit Agreement Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Asset held for sale at beginning Asset held for sale at ending Real Estate, Held-for-Sale Right of use assets - finance lease Finance Lease, Right-of-Use Asset, after Accumulated Amortization Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Earnings Per Common Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings per common share Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Property rental Lease Income Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Issuance of Operating Partnership units in conjunction with acquisitions Noncontrolling Interest, Increase From Acquisitions Noncontrolling Interest, Increase From Acquisitions Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Excess Profit % Unconsolidated Joint Ventures Excess Profit Participation Percentage The percentage of excess profit participation in unconsolidated joint ventures. Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Number of Stores Equity Method Investment, Number Of Stores Equity Method Investment, Number Of Stores Company Selected Measure Name Company Selected Measure Name Sale of Stock [Domain] Sale of Stock [Domain] Distributions to noncontrolling interests, net of contributions Payments of Ordinary Dividends, Noncontrolling Interest Income allocated to noncontrolling interest - Preferred OP Units and OP Units Net Income Loss Attributable To Noncontrolling Interest In Operating Partnership Net Income Loss Attributable To Noncontrolling Interest In Operating Partnership Value of OP Units issued in conjunction with acquisitions Noncontrolling Interest, Operating Partnership Units Issued With Business Combination, Acquisition, And Preferred Unit Conversion, Value Noncontrolling Interest, Operating Partnership Units Issued With Business Combination, Acquisition, And Preferred Unit Conversion, Value Fixed rate debt Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate Ownership interest held Subsidiary, Ownership Percentage, Parent Total Total Long-Term Debt, Gross 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 Investment in unconsolidated real estate entities Payments For Investment In Unconsolidated Real Estate Entities Payments For Investment In Unconsolidated Real Estate Entities Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Diluted (in shares) Average number of common shares outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Cash dividends paid per common share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Commercial paper Commercial Paper [Member] Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Bridge Loan Payoff Noncash or Part Noncash Acquisition, Bridge Loan Payoff Noncash or Part Noncash Acquisition, Bridge Loan Payoff JCAP Series A Preferred Stock JCAP Series A Preferred Stock [Member] JCAP Series A Preferred Stock Redemption of Operating Partnership units (in shares) Minority Interest, Decrease From Redemptions, Shares Minority Interest, Decrease From Redemptions, Shares Noncontrolling interests in Operating Partnership Noncontrolling Interest, Increase (Decrease) From Redemptions Of Operating Partnership Units Noncontrolling Interest, Increase (Decrease) From Redemptions Of Operating Partnership Units Gain on real estate assets held for sale and sold, net Gains (Loss) On Real Estate Transactions, Net Of Impairment Of Real Estate Gains (Loss) On Real Estate Transactions, Net Of Impairment Of Real Estate Loan to value ratio Financing Receivable, Loan To Value Ratio Financing Receivable, Loan To Value Ratio 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 Dividends and interest receivable Dividends Receivable (Gain) loss recognized at beginning (Gain) loss recognized at ending Accumulated Gain (Loss) On Real Estate, Held-For-Sale Accumulated Gain (Loss) On Real Estate, Held-For-Sale Award Timing Predetermined Award Timing Predetermined [Flag] Number of joint ventures with property under development Number Of Joint Ventures With Property Under Development Number Of Joint Ventures With Property Under Development Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [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] Common stock and paid-in capital Redemption Of Operating Partnership Units Held By Noncontrolling Interest Including Additional Paid In Capital Redemption Of Operating Partnership Units Held By Noncontrolling Interest Including Additional Paid In Capital Other unconsolidated real estate ventures Other Minority Owned Properties [Member] Other Minority Owned Properties [Member] All Executive Categories All Executive Categories [Member] Number of states in which operating storage facilities are located Number of States in which Entity Operates Repurchase of common stock Stock Repurchased and Retired During Period, Value Life Storage, Inc Life Storage, Inc [Member] Life Storage, Inc Proceeds from sale of notes receivable Proceeds from Sale of Notes Receivable Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Debt securities, extension term Debt Securities Held To Maturity, Extension Term Debt Securities Held To Maturity, Extension Term Preferred stock, par value (dollars per share) Preferred Stock, Par or Stated Value Per Share Asset Acquisition [Domain] Asset Acquisition [Domain] 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. Real estate assets - operating lease right-of-use assets Operating Lease, Right-of-Use Asset Secured credit line Secured Credit Line [Member] Secured Credit Line HF6 191 V Life Storage Holdings LLC HF6 191 V Life Storage Holdings LLC [Member] HF6 191 V Life Storage Holdings LLC Amount reclassified as a decrease to interest income Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Schedule of Computation of Earnings Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Segment Information Segment Reporting [Text Block] Minimum Minimum [Member] Revolving lines of credit and commercial paper Commercial paper Amount Drawn Long-Term Line of Credit Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date 2030 Long-Term Debt, Maturity, Year Four Strategic Storage Trust VI, Inc. Preferred Stock Strategic Storage Trust VI, Inc. Preferred Stock [Member] Strategic Storage Trust VI, Inc. Preferred Stock 2033 Long-Term Debt, Maturity, Year Seven Long-Term Debt, Maturity, Year Seven Remeasurement of lease right of use assets and lease liabilities Operating Lease Right Of Use Assets and Lease Liabilites [Abstract] Operating Lease Right Of Use Assets and Lease Liabilites Weighted average number of shares Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] 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. Total noncontrolling interests and equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Investments in unconsolidated real estate entities Investments in unconsolidated real estate entities Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Payment for draw on interest holdback Payment For Draw On Interest Holdback Payment For Draw On Interest Holdback Other liabilities Other Liabilities Dividends paid on common stock Dividends, Common Stock Unsecured term loans, net Unsecured Debt Value of investment in consolidated real estate ventures Investments In Real Estate Joint Ventures, Net Of Distributions Received Investments In Real Estate Joint Ventures, Net Of Distributions Received Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Common stock, authorized (in shares) Common Stock, Shares Authorized Office expense Office Expense Office Expense Thereafter Long-Term Debt, Maturity, After Year Nine Long-Term Debt, Maturity, After Year Nine Real estate assets, net Real estate assets, net Real Estate Investment Property, Net Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Shares issued (in shares) Sale of Stock, Number of Shares Issued in Transaction Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-Maturity Securities [Line Items] Less: Discount on unsecured senior notes, net Debt Instrument, Unamortized Discount (Premium), Net Exercise Price Award Exercise Price Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Segment Reporting [Line Items] Segment Reporting [Line Items] Share repurchase program, aggregate value Share Repurchase Program, Authorized, Amount Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Carrying Value of Assets Held for Sale Assets Held For Sale Carrying Value, Activity [Roll Forward] Assets Held For Sale Carrying Value, Activity Swap Agreements Interest Rate Swap [Member] Receivables, net Accounts Receivable, after Allowance for Credit Loss Income before equity in earnings and dividend income from unconsolidated real estate entities and income tax expense Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest VRS Self Storage, LLC VRS Self Storage LLC [Member] VRS Self Storage LLC [Member] Debt Debt Disclosure [Text Block] Number of joint ventures operating store Number Of Joint Ventures Operating Number Of Joint Ventures Less: Unamortized debt issuance costs Debt Issuance Costs, Net Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Real Estate Assets Real Estate Disclosure [Text Block] Real estate assets, net Acquisition And Remeasurement Of Lease Right of Use Assets, Net Real Estate Assets Acquired Acquisition And Remeasurement Of Lease Right of Use Assets, Net Real Estate Assets Acquired Acquisitions and Dispositions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Property taxes Real Estate Tax Expense Deferred line of credit financing costs, net Deferred Costs Net debt assumed Asset Acquisition, Real Estate Assets, Net Liabilities Assumed Asset Acquisition, Real Estate Assets, Net Liabilities Assumed Total expenses Costs and Expenses Adoption Date Trading Arrangement Adoption Date Series A Units Series A Units [Member] Series A Units [Member] Total Extra Space Storage Inc. stockholders’ equity Equity, Attributable to Parent Total number of stores in consolidated joint venture Total Number Of Stores In Consolidated Joint Ventures Total Number Of Stores In Consolidated Joint Ventures Assets: Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Accrual of interest income added to principal of debt securities and notes receivable Noncash Interest Income Noncash Interest Income Operating lease liabilities Operating Lease, Liability Insider Trading Policies and Procedures [Line Items] Schedule of Investments in Debt Securities and Bridge Loans Receivable Schedule Of Investments In Debt Securities And Financing Receivables [Table Text Block] Schedule Of Investments In Debt Securities And Financing Receivables Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Other components of net income: Other Components of Net Income [Abstract] Other Components of Net Income Schedule of Information on Lines of Credit Schedule of Line of Credit Facilities [Table Text Block] Other assets - Cash flow hedge swap agreements Other assets Interest Rate Cash Flow Hedge Asset at Fair Value Bridge loans, extension term Financing Receivable, Extension Term Financing Receivable, Extension Term Principal payments on secured and unsecured term loans, senior notes, revolving lines of credit and commercial paper Repayments of Debt Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] 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 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] Entity Central Index Key Entity Central Index Key Additional paid-in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation 2026 Long-Term Debt, Maturity, Remainder of Fiscal Year Issuance of notes receivable Issuance of notes receivable Payments to Acquire Notes Receivable Income Statement [Abstract] Income Statement [Abstract] Extra Space Storage Inc. stockholders’ equity: Equity, Attributable to Parent [Abstract] Interest expense Interest expense Interest Expense, Excluding Amortization Of Debt Discount (Premium) Interest Expense, Excluding Amortization Of Debt Discount (Premium) Document Transition Report Document Transition Report Ownership [Axis] Ownership [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Investment, Name [Axis] Investment, Name [Axis] Dividend rate, percentage Preferred Stock, Dividend Rate, Percentage Payments received on notes receivable Proceeds from Collection of Notes Receivable Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] HF1 Sovran HHF Storage Holdings LLC HF1 Sovran HHF Storage Holdings LLC [Member] HF1 Sovran HHF Storage Holdings LLC Buildings, improvements and other intangibles Investment Building and Building Improvements Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Other Commitments [Domain] Other Commitments [Domain] City Area Code City Area Code Marketing Marketing Expense Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Redemption period Preferred Stock, Redemption Period Preferred Stock, Redemption Period All Individuals All Individuals [Member] Non-cash lease expense Operating Lease, Right-of-Use Asset, Periodic Reduction Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Tenant reinsurance Tenant Reinsurance Expense The expense in the period incurred with respect to the entity's tenant reinsurance program. Statement [Line Items] Statement [Line Items] Accrued construction costs and capital expenditures Accrued Construction Costs And Capital Expenditures [Abstract] Accrued Construction Costs And Capital Expenditures [Abstract] Total assets Assets Number of stores owned by franchisees and 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. Preferred stock, issued (in shares) Preferred Stock, Shares Issued Redemption Of Units For Cash Redemption Of Units For Cash [Member] Redemption Of Units For Cash [Member] Operating Segments Operating Segments [Member] Preferred units outstanding (in shares) Preferred Units, Outstanding Other assets Increase (Decrease) in Other Operating Assets Preferred Units by Name [Axis] Preferred Units by Name [Axis] Organization Nature of Operations [Text Block] Redemption of Operating Partnership units for cash Cash Portion Of Redemption Of Operating Partnership Units Cash Portion Of Redemption Of Operating Partnership Units PEO PEO [Member] 2028 Long-Term Debt, Maturity, Year Two Measurement Basis [Axis] Measurement Basis [Axis] Repurchase of common stock (in shares) Repurchase of common stock (in shares) Stock Repurchased and Retired During Period, Shares Goodwill Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount PRISA Self Storage LLC Prisa Self Storage LLC [Member] Prisa Self Storage LLC [Member] Number of sales agents Number Of Sales Agents Number Of Sales Agents Subsequent Event Type [Domain] Subsequent Event Type [Domain] Accumulated Deficit Retained Earnings [Member] Total segment operating expenses Operating Expenses Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Purchase of remaining equity interest in existing unconsolidated joint venture Adjustments To Additional Paid In Capital Purchase Of Remaining Equity Interest In Consolidated Joint Venture Adjustments To Additional Paid In Capital, Purchase Of Remaining Equity Interest In Consolidated Joint Venture Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Schedule of Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Acquisition of real estate assets and improvements Payments to Acquire Real Estate Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Ownership [Domain] Ownership [Domain] Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] 2029 Long-Term Debt, Maturity, Year Three Equipment and fixtures, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Management fees and other income Management fees and other income Revenue from Contract with Customer, Excluding Assessed Tax Financial Instruments [Domain] Financial Instruments [Domain] Number of stores, disposals Real Estate, Held-For-Sale, Number of Properties Sold Real Estate, Held-For-Sale, Number of Properties Sold Prepaid expenses and deposits Prepaid Expense And Deposits Prepaid Expense And Deposits Net operating income Net Operating Income [Abstract] Net Operating Income Fair value of interest rate swaps Derivative Asset Shares exchanged (in shares) Debt Securities, Held To Maturity, Number Of Shares, Exchanged Debt Securities, Held To Maturity, Number Of Shares, Exchanged Shares exchanged, value Debt Securities, Held To Maturity, Number Of Shares, Exchanged, Value Debt Securities, Held To Maturity, Shares Exchanged, Value Equity in earnings of unconsolidated real estate ventures - gain on sale of a joint venture interest Equity in earnings of unconsolidated real estate ventures - gain on sale of a joint venture interest Equity in earnings of unconsolidated real estate ventures - gain on sale of a joint venture interest Equity Method Investments, Gain (Loss) On Sale Of Real Estate Assets Equity Method Investments, Gain (Loss) On Sale Of Real Estate Assets (Gain) loss recognized, disposals Gain (Loss) On Disposal Of Real Estate, Held-For-Sale Gain (Loss) On Disposal Of Real Estate, Held-For-Sale Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Less: comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Fair Value Estimate of Fair Value Measurement [Member] JCAP Series D Preferred Stock JCAP Series D Preferred Stock [Member] JCAP Series D Preferred Stock Storage Portfolio IV JV LLC Storage Portfolio IV JV LLC [Member] Storage Portfolio IV JV LLC Number of consolidated joint ventures Real Estate Consolidated Joint Ventures Number Represents the number of consolidated joint ventures as of the balance sheet date. Net Liabilities/ (Assets) Assumed Asset Acquisition, Consideration Transferred, Other Assets Acquisition of real estate assets Real Estate Additions, Portion Not Yet Paid Real Estate Additions, Portion Not Yet Paid Segment Reporting [Table] Segment Reporting [Table] Schedule of Maturities of Notes Payable Schedule of Maturities of Long-Term Debt [Table Text Block] Number of derivative financial instruments Derivative, Number of Instruments Held Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract] Sale of Stock [Axis] Sale of Stock [Axis] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Redemption Of Units For Common Stock Redemption Of Units For Common Stock [Member] Redemption Of Units For Common Stock Income from operations Net operating income Operating Income (Loss) Annual rate of return percentage Noncontrolling Interest In Preferred Operating Partnership Units Annual Rate Of Return Represents the annual rate of return of preferred operating partnership units. Current Fiscal Year End Date Current Fiscal Year End Date Proceeds from secured and unsecured term loans, senior notes, revolving lines of credit and commercial paper Proceeds from Issuance of Debt Purchase price , 2026 Other Commitment, to be Paid, Remainder of Fiscal Year Debt securities - preferred stock Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Net income allocated to Preferred Operating Partnership noncontrolling interests Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable Fixed rate debt Notes Payable, Fair Value Disclosure Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Bridge loans, extension option Financing Receivable, Extension Option Financing Receivable, Extension Option Distributions to Operating Partnership units and other noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Gain (loss) reclassified from OCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] 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. Unsecured senior notes, net Senior Notes Common stock, issued (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Investments in Unconsolidated Real Estate Entities Equity Method Investments and Joint Ventures Disclosure [Text Block] Noncontrolling interests in Operating Partnership, net and other noncontrolling interests Noncontrolling Interest in Operating Partnerships Non-cash interest expense related to amortization of discount on unsecured senior notes, net Non-cash interest expense related to amortization of discount on unsecured senior notes, net Non-cash interest expense related to amortization of discount on unsecured senior notes, net Amortization of Debt Discount (Premium) Real estate under development/redevelopment Development in Process Other Assets Other Assets Disclosure [Text Block] Value of Equity 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 Distributions in excess of earnings from unconsolidated real estate ventures Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Variable rate debt Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate Consideration to be paid on redemption of common OP units Operating Partnership Units Redemption Amount Represents the amount the entity would have paid in cash to redeem the operating partnership units. Storage Portfolio I LLC Storage Portfolio I LLC [Member] Storage Portfolio I LLC [Member] Equity Components [Axis] Equity Components [Axis] Redemption of Preferred OP units for cash Cash Portion Of Redemption Of Preferred Operating Partnership Units The amount of cash paid upon the redemption of Preferred Operating Partnership Units. Class of Stock [Line Items] Class of Stock [Line Items] Schedule of Asset Acquisitions Asset Acquisition [Table Text Block] Entity Interactive Data Current Entity Interactive Data Current Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Property operating expense Property Operating Lease, Expense Property Operating Lease, Expense Other liabilities Other Liabilities Related To Operating Lease Right Of Use Assets And Lease Liabilities Other Liabilities Related To Operating Lease Right Of Use Assets And Lease Liabilities Entity Small Business Entity Small Business Comprehensive income attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Unamortized cash discount Debt Instrument, Unamortized Discount Termination Date Trading Arrangement Termination Date Other Commitments [Axis] Other Commitments [Axis] 2035 Long-Term Debt, Maturity, Year Nine Long-Term Debt, Maturity, Year Nine Noncontrolling Interest [Table] Noncontrolling Interest [Table] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Issuance of common stock for share based compensation and taxes paid upon net settlement Restricted Stock, Value, Shares Issued Net of Tax Withholdings MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Real estate assets, net Noncash Or Part Noncash Acquisition, Net Real Estate Assets Acquired Represents the amount of real estate assets that an Entity acquires in a noncash (or part noncash) acquisition. Real estate assets refer to the lands, buildings and intangible assets (including those that are part of operations and those under development) of a real estate entity, net of accumulated depreciation and amortization. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] Document Type Document Type 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] Strategic Storage Growth Trust III, Inc. Preferred Stock Strategic Storage Growth Trust III, Inc. Preferred Stock [Member] Strategic Storage Growth Trust III, Inc. Preferred Stock Fair Value as of Grant Date Award Grant Date Fair Value Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Share repurchase program, remaining authorization value Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Bonds Bonds [Member] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies Commitments and Contingencies Total revenues Revenues Revenues Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Bridge loans, percent of notes held as mortgage receivables Financing Receivable, Percent Held as Mortgage Receivables Financing Receivable, Percent of Mortgage Receivables Equity in earnings and dividend income from unconsolidated real estate entities Equity in earnings and dividend income from unconsolidated real estate entities Income (Loss) from Equity Method Investments Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Debt securities, dividend rate Debt Securities Held To Maturity, Dividend Rate Debt Securities Held To Maturity, Dividend Rate Receivable Type [Axis] Receivable Type [Axis] Liabilities, Noncontrolling Interests and Equity: Liabilities and Equity [Abstract] Other Commitments [Table] Other Commitments [Table] Series B Units Series B Units [Member] Series B Units [Member] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Disclosures Fair Value Disclosures [Text Block] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Debt securities, period after which preferred dividends increase annually Debt Securities Held To Maturity, Period After Which Preferred Dividends Increase Annually Debt Securities Held To Maturity, Period After Which Preferred Dividends Increase Annually Number of Stores Asset Held For Sale, Gain (Loss) Recognized [Roll Forward] Asset Held For Sale, Gain (Loss) Recognized Ownership interest held by joint venture partner Subsidiary, Ownership Percentage, Noncontrolling Owner Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities PEO Name PEO Name Restricted cash included in other assets Restricted cash Restricted Cash Other segment items Segment Reporting, Other Segment Item, Amount Other assets, net Other assets, net Other Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Common 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. Other Commitments [Line Items] Other Commitments [Line Items] Issuance of common stock for share based compensation and taxes paid upon net settlement (in shares) Restricted Stock, Shares Issued Net of Shares for Tax Withholdings 2032 Long-Term Debt, Maturity, Year Six Long-Term Debt, Maturity, Year Six 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. Commitment to acquire stores Commitment To Acquire Stores [Member] Commitment To Acquire Retail Space Cash, cash equivalents, and restricted cash, beginning of the period Cash, cash equivalents, and restricted cash, end of the period Cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Unsecured credit line Unsecured Credit Line [Member] Unsecured Credit Line Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Fixed liquidation value (in shares) Noncontrolling Interest In Preferred Operating Partnership Units, Fixed Liquidation Value, Shares Noncontrolling Interest In Preferred Operating Partnership Units, Fixed Liquidation Value, Shares Debt Instrument [Axis] Debt Instrument [Axis] Equity Ownership % Equity Method Investment, Ownership Percentage Compensation expense related to share-based awards Share-Based Payment Arrangement, Noncash Expense Payroll and benefits Labor and Related Expense Land Land Debt securities, extension option Debt Securities Held To Maturity, Extension Option Debt Securities Held To Maturity, Extension Option Redemption of Operating Partnership units for stock (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities 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. Other Other noncontrolling interests Non Controlling Interest Other [Member] Non Controlling Interest Other [Member] Investment, Name [Domain] Investment, Name [Domain] 2027 Long-Term Debt, Maturity, Year One Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] 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] Basic (in dollars per share) Earnings Per Share, Basic Number of real estate properties to be acquired Number Of Real Estate Properties To Be Acquired Number Of Real Estate Properties To Be Acquired Repurchase of common stock Payments for Repurchase of Common Stock Statistical Measurement [Axis] Statistical Measurement [Axis] HF10 Life Storage HHF Wasatch Holdings LLC HF10 Life Storage HHF Wasatch Holdings LLC [Member] HF10 Life Storage HHF Wasatch Holdings LLC Number of stores, additions Real Estate, Held-For-Sale, Number of Properties Purchased Real Estate, Held-For-Sale, Number of Properties Purchased Insider Trading Arrangements [Line Items] Schedule of Information Relating to Gain (Loss) Recognized on Swap Agreements Derivative Instruments, Gain (Loss) [Table Text Block] Development and redevelopment of real estate assets Payments to Develop Real Estate Assets Property operations Cost of Revenue Award Type Award Type [Axis] Gain (loss) recognized in OCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Deferred financing costs Payments of Financing Costs Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accumulated deficit Retained Earnings (Accumulated Deficit) Cash distributions in unconsolidated real estate ventures Cash distributions in unconsolidated real estate ventures Cash Distributions In Unconsolidated Real Estate Ventures Cash Distributions In Unconsolidated Real Estate Ventures Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] HF2 Sovran HHF Storage Holdings II LLC HF2 Sovran HHF Storage Holdings II LLC [Member] HF2 Sovran HHF Storage Holdings II LLC Common Stock Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover page. Cover [Abstract] Self-Storage Operations Self Storage Operations [Member] Self Storage Operations [Member] Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Unit conversion ratio Shareholders' Equity, Units Conversion Ratio Shareholders' Equity, Units Conversion Ratio Dividend rate increase, threshold Preferred Stock, Dividend Rate Increase, Threshold Preferred Stock, Dividend Rate Increase, Threshold Noncontrolling interest in consolidated joint ventures Noncontrolling Interest, Increase From Transactions With Other Noncontrolling Interests, Net Noncontrolling Interest, Increase From Transactions With Other Noncontrolling Interests, Net Derivative Contract [Domain] Derivative Contract [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Fair Value Adjustment of Debt Assumed Noncash or Part Noncash Acquisition, Fair Value Adjustment Of Debt Assumed Noncash or Part Noncash Acquisition, Fair Value Adjustment Of Debt Assumed Total liabilities, noncontrolling interests and equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Earnings per common share Earnings Per Share, Basic and Diluted EPS [Abstract] Earnings Per Share, Basic and Diluted EPS Fair Value of Financial Instruments [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Segments [Axis] Segments [Axis] Other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Number of stores at beginning Number of stores at ending Real Estate, Held-For-Sale, Number of Properties Real Estate, Held-For-Sale, Number of Properties Investments in Debt Securities and Notes Receivable Investments In Debt Securities And Financing Receivables [Text Block] Investments In Debt Securities And Financing Receivables Tabular List, Table Tabular List [Table Text Block] Secured notes payable Notes Payable to Banks [Member] Tenant Reinsurance Tenant Reinsurance [Member] Tenant Reinsurance [Member] Investment in debt securities Payments to Acquire Held-to-Maturity Securities HF5 Life Storage-HIERS Storage LLC HF5 Life Storage-HIERS Storage LLC [Member] HF5 Life Storage-HIERS Storage LLC Loans Assumed Noncash or Part Noncash Acquisition, Debt Assumed OP Units issued in conjunction with acquisitions (in units) Noncontrolling Interest, Operating Partnership Units Issued With Business Combination, Acquisition, and Preferred Unit Conversion Noncontrolling Interest, Operating Partnership Units Issued With Business Combination, Acquisition, and Preferred Unit Conversion Repayment of debt Repayments of Senior Debt Name Awards Close in Time to MNPI Disclosures, Individual Name Noncontrolling Interests and Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Investment in shares Payments to Acquire Investments Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Schedule of Redeemable Noncontrolling Interest Redeemable Noncontrolling Interest [Table Text Block] General and administrative General and administrative expense General and Administrative Expense Secured notes payable, net Other Notes Payable Redemption of Operating Partnership units for stock Stock Issued During Period, Value, Conversion of Convertible Securities Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, $0.01 par value, 50,000,000 shares authorized, no shares issued or outstanding Preferred Stock, Value, Issued Common OP Units Common OP Units [Member] Common OP Units Adjustment to Compensation: Adjustment to Compensation [Axis] Number of operating storage facilities in which the entity has equity interests (in stores) Number of Real Estate Properties Preferred Units, Class [Domain] Preferred Units, Class [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash Paid Payments to Acquire Productive Assets Number of operating stores owned and/or managed Number Of Real Estate Properties Owned And Or Managed The number of real estate properties owned and/or managed as of the balance sheet date. Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Other liabilities - Cash flow hedge swap agreements Other liabilities Interest Rate Cash Flow Hedge Liability at Fair Value Other commitment Other Commitment Earnings and dividends allocated to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Redemption of Operating Partnership units for cash Redemption of noncontrolling interests for cash Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Investments in debt securities and notes receivable Investments in debt securities and notes receivable Debt Securities, Held To Maturity And Financing Receivable, After Allowance For Credit Loss, And Interest Receivable Debt Securities, Held To Maturity And Financing Receivable, After Allowance For Credit Loss, And Interest Receivable Unsecured Senior Note Due February 2032 Unsecured Senior Note Due February 2032 [Member] Unsecured Senior Note Due February 2032 Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Number of Stores Number Of Real Estate Properties Acquired Represents the number of real estate properties acquired. Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Loan receivable, reduction of noncontrolling interests Note Receivable, Reduction Of Noncontrolling Interests Note Receivable, Reduction Of Noncontrolling Interests Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Number of debt securities past due or nonaccrual status Number Of Debt Securities Past Due Or Nonaccrual Status Number Of Debt Securities Past Due Or Nonaccrual Status Investment balance Investment In Unconsolidated Real Estate Entities, Net Of Distributions Investment In Unconsolidated Real Estate Entities, Net Of Distributions Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Supplemental schedule of cash flow information Supplemental Cash Flow Elements [Abstract] Insurance General Insurance Expense Lines Of Credit Lines Of Credit [Member] Lines Of Credit Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and equivalents Cash and Cash Equivalent Note receivable from Common Operating Partnership unit holder 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). Company Selected Measure Amount Company Selected Measure Amount Agreement to originate bridge loans Agreement To Originate Bridge Loans [Member] Agreement To Originate Bridge Loans Investments, Debt and Equity Securities [Abstract] Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Depreciation and amortization Depreciation and amortization Depreciation and amortization expense Depreciation, Depletion and Amortization Purchase price , 2027 Other Commitment, to be Paid, Year One Fixed liquidation value Noncontrolling Interest In Preferred Operating Partnership Units Fixed Liquidation Value Represents the fixed liquidation value of preferred operating partnership units. Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Net income Net income Net income (loss) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Intangible assets - tenant relationships Real Estate Investment Property, Intangible Tenant Relationships Real Estate Investment Property, Intangible Tenant Relationships Real Estate [Abstract] Real Estate [Abstract] 2031 Long-Term Debt, Maturity, Year Five Proceeds from sale of real estate assets Proceeds from Sale, Real Estate, Held-for-Investment Non-PEO NEO Non-PEO NEO [Member] Unsecured senior notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Real estate assets - operating lease right-of-use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Income tax expense Income tax expense Income Tax Expense (Benefit) Award Timing Method Award Timing Method [Text Block] Net change in cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Strategic Storage Growth Trust III, Inc. Strategic Storage Growth Trust III, Inc. [Member] Strategic Storage Growth Trust III, Inc. Bridge loans, original maturities Financing Receivable, Term Financing Receivable, Term Net income attributable to common stockholders Net income attributable to common stockholders Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Notes receivable - bridge loans, net Bridge Loan [Member] Statement [Table] Statement [Table] 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. Operating Partnership Common Operating Partnership [Member] Common Operating Partnership [Member] Restatement Determination Date: Restatement Determination Date [Axis] Unamortized debt premium Debt Instrument, Unamortized Premium Interest income Interest income Investment Income, Interest Assets held for sale, additions Real Estate, Held-for-Sale, Additions Real Estate, Held-for-Sale, Additions Value of OP units issued Issuance Of Equity For Acquisition Of Real Estate Assets Issuance Of Equity For Acquisition Of Real Estate Assets (Gain) loss recognized, additions Gain (Loss) On Purchase Of Real Estate, Held-For-Sale Gain (Loss) On Purchase Of Real Estate, Held-For-Sale Schedule of Components of Other Assets Schedule of Other Assets [Table Text Block] Operating lease liabilities Establishment Of Operating Lease Liability Establishment Of Operating Lease Liability Series C Units Series C Units [Member] Series C Units Revenues: Revenues Revenues [Abstract] Schedule of Held For Sale Activity Real Estate, Held-For-Sale, Activity [Table Text Block] Real Estate, Held-For-Sale, Activity Schedule of Balances of OP Units Noncontrolling Interest [Table Text Block] Noncontrolling Interest Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Repairs and maintenance Repairs And Maintenance Expense Repairs And Maintenance Expense Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]