Accounts Payable And Accrued Liabilities Current And Noncurrent Accounts payable and accrued liabilities Accounts Receivable Net Accounts receivable Accumulated Distributions In Excess Of Net Income Dividends in excess of net income Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated other comprehensive loss Acquisition Costs Acquisition of storage facilities Additional Paid In Capital Common Stock Additional paid-in capital Additional Properties Acquired Additional Properties Acquired Additional properties acquired Adjustments To Additional Paid In Capital Other Reduction of additional paid-in capital Adjustments To Additional Paid In Capital Stock Issued Issuance Costs Expenses related to Equity Program Adjustments to derivatives instruments text block. Adjustments To Derivatives Instruments [Text Block] Summary of Derivative Instruments by Hedge Designation Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Advances reimbursement of advances to joint ventures Advances Reimbursement Of Advances To Joint Ventures Advances to joint ventures Aggregate Net Book Value Of Property Pledged For Mortgage Note. Aggregate Net Book Value Of Property Pledged For Mortgage Note Aggregate net book value of property pledged for mortgage note Amendment Flag Amendment Flag Amortization expense, including amortization of in-place customer leases Amortization Expense Including Amortization Of In Place Customer Leases Amortization expense related to in-place customer leases Amortization Of Financing Costs Amortization of deferred financing fees Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Securities not included in the effect of dilutive securities Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Name [Domain] Antidilutive Securities, Name [Domain] Assets Total assets Total Assets Assets [Abstract] Assets Assets pledged as collateral, number Assets Pledged As Collateral Number Self-storage facilities Basis Of Presentation And Significant Accounting Policies [Text Block] BASIS OF PRESENTATION Building, equipment, and construction in progress. Building Equipment And Construction In Progress Building, equipment, and construction in progress Business Acquisition Acquiree [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition Cost Of Acquired Entity Cash Paid Cash Paid Business Acquisition Cost Of Acquired Entity Purchase Price Payment for properties acquisition Purchase Price Business Acquisition Effective Date Of Acquisition 1 Date of Acquisition Business Acquisition Purchase Price Allocation Land Land Business Acquisition Purchase Price Allocation Noncurrent Liabilities Long Term Debt Loan Assumed Business Acquisition Purchase Price Allocation Property Plant And Equipment Building, Equipment, and Improvements Business Combination Acquisition Related Costs Acquisition costs Closing Costs Expensed Business Combination On Acquisition Fee Received Business Combination On Acquisition Fee Received Acquisition fee received for securing purchases Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net Net Other Liabilities (Assets) Assumed Cash And Cash Equivalents At Carrying Value Cash at end of period Cash at beginning of period Cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Net (decrease) increase in cash Cash Flow Hedge Loss Reclassified To Interest Expense Realized loss reclassified from accumulated other comprehensive loss to interest expense Class Of Stock [Line Items] Class of Stock [Line Items] Commitments And Contingencies Disclosure [Text Block] Commitment And Contingencies Common Stock Dividends Per Share Declared Dividends declared per common share Common Stock Par Or Stated Value Per Share Common stock, par value Common Stock Shares Authorized Common stock, shares authorized Common Stock Shares Issued Common stock shares issued under equity offering program Common Stock Shares Outstanding Common stock, shares outstanding Common Stock Value Common stock $.01 par value, 100,000,000 shares authorized, 30,432,720 shares outstanding (28,952,356 at December 31, 2011) Common Stock Value Authorized Under Equity offering Program Common Stock Value Authorized Under Equity Offering Program Common stock value authorized under equity offering program Common Stock, Value Reserved for Future Issuance Common Stock Value Reserved For Future Issuance Common stock, value reserved for future issuance Common Stock Weighted Average Issue Price Per Share Common Stock Weighted Average Issue Price Per Share Weighted average issue price of common stock Company Share Of JV Property Acquisition Costs Company Share Of J V Property Acquisition Costs Acquisition related costs Comprehensive Income Net Of Tax Comprehensive income attributable to common shareholders Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest Comprehensive income attributable to noncontrolling interest Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Total comprehensive income Concentration Risk Percentage 1 Concentration risk, percentage Cost Of Property Repairs And Maintenance Property operations and maintenance Costs And Expenses Total operating expenses Costs And Expenses [Abstract] Expenses Current Federal Tax Expense Benefit Federal and state income tax expense Current Fiscal Year End Date Current Fiscal Year End Date Date Of Acquisition [Axis] Date Of Acquisition [Axis] Date Of Acquisition [Axis] Date Of Acquisition [Domain] Date Of Acquisition [Domain] Date Of Acquisition [Domain] Date Of Acquisition July Eighteen Two Thousand And Twelve [Member] Date Of Acquisition July Eighteen Two Thousand And Twelve [Member] Date Of Acquisition, 7/18/2012 [Member] Date Of Acquisition June Six Two Thousand And Twelve [Member] Date Of Acquisition June Six Two Thousand And Twelve [Member] Date Of Acquisition, 6/6/2012 [Member] Date Of Acquisition June Twenty Two Thousand And Twelve [Member] Date Of Acquisition June Twenty Two Thousand And Twelve [Member] Date Of Acquisition, 6/20/2012 [Member] Date Of Acquisition May Sixteen Two Thousand And Twelve [Member] Date Of Acquisition May Sixteen Two Thousand And Twelve [Member] Date Of Acquisition, 5/16/2012 [Member] Date Of Acquisition September Eighteen Two Thousand And Twelve [Member] Date Of Acquisition September Eighteen Two Thousand And Twelve [Member] Date Of Acquisition, 9/18/2012 [Member] Date Of Acquisition September Nineteen Two Thousand And Twelve [Member] Date Of Acquisition September Nineteen Two Thousand And Twelve [Member] Date Of Acquisition, 9/19/2012 [Member] Date Of Acquisition September Twenty Seven Two Thousand And Twelve [Member] Date Of Acquisition September Twenty Seven Two Thousand And Twelve [Member] Date Of Acquisition, 9/27/2012 [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument Basis Spread On Variable Rate Basis spread over LIBOR Debt Instrument Fair Value Debt Instrument, Fair Value Debt Instrument Increase Additional Borrowings Additional secured term note Debt Instrument Interest Rate At Period End Interest rate at end of period Debt Instrument Interest Rate Effective Percentage Effective interest rate Debt Instrument Interest Rate Stated Percentage Term note stated interest rate Debt Instrument Interest Rate Stated Percentage Rate Range Maximum Increase in interest rate on term loan Debt Instrument [Line Items] Debt Instrument [Line Items] Debt Instrument Maturity Date Range Start 1 Line of credit facility, maturity date range, start Debt Instrument Name [Domain] Debt Instrument, Name [Domain] Debt Instrument [Table] Schedule of Long-term Debt Instruments [Table] Deferred Revenue Deferred revenue Deferred Tax Liabilities Deferred tax liability Denominator [Abstract] Denominator [Abstract] Denominator: Depreciation Depreciation expense during the period Depreciation And Amortization Depreciation and amortization Depreciation and amortization Depreciation Depletion And Amortization Depreciation and amortization Derivative By Nature [Axis] Derivative, by Nature [Axis] Derivative Description Of Variable Rate Basis Floating Rate Received Derivative Financial Instruments Liabilities Fair Value Disclosure Interest rate swaps Derivative Fixed Interest Rate Fixed Rate Paid Derivative Inception Dates Effective Date Derivative Instruments And Hedging Activities Disclosure [Text Block] DERIVATIVE FINANCIAL INSTRUMENTS Derivative [Line Items] Derivative [Line Items] Derivative Maturity Dates Expiration Date Derivative Name [Domain] Derivative, Name [Domain] Derivative [Table] Derivative [Table] Dilutive Securities Effect [Abstract] Dilutive Securities Effect [Abstract] Effect of Dilutive Securities: Disclosure - Assets And Liabilities Carried At Fair Value Measured On A Recurring Basis [Abstract] Disclosure Assets And Liabilities Carried At Fair Value Measured On A Recurring Basis [Abstract] Disclosure - Assets And Liabilities Carried At Fair Value Measured On A Recurring Basis [Abstract] Disclosure - Computation Of Basic And Diluted Earnings Per Common Share [Abstract] Disclosure Computation Of Basic And Diluted Earnings Per Common Share [Abstract] Disclosure - Computation Of Basic And Diluted Earnings Per Common Share [Abstract] Disclosure Derivative Financial Instruments Additional Information [Abstract] Disclosure Derivative Financial Instruments Additional Information [Abstract] Disclosure Derivative Financial Instruments Additional Information [Abstract] Disclosure Discontinued Operations Additional Information [Abstract] Disclosure Discontinued Operations Additional Information [Abstract] Disclosure Discontinued Operations Additional Information [Abstract] Disclosure Earnings Per Share Additional Information [Abstract] Disclosure Earnings Per Share Additional Information [Abstract] Disclosure Earnings Per Share Additional Information [Abstract] Disclosure - Equity Offering - Additional Information [Abstract] Disclosure Equity Offering Additional Information [Abstract] Disclosure - Equity Offering - Additional Information [Abstract] Disclosure Fair Value Measurements Additional Information [Abstract] Disclosure Fair Value Measurements Additional Information [Abstract] Disclosure Fair Value Measurements Additional Information [Abstract] Disclosure Income Taxes Additional Information [Abstract] Disclosure Income Taxes Additional Information [Abstract] Disclosure Income Taxes Additional Information [Abstract] Disclosure - Investment In Joint Ventures - Additional Information [Abstract] Disclosure Investment In Joint Ventures Additional Information [Abstract] Disclosure - Investment In Joint Ventures - Additional Information [Abstract] Disclosure - Investment In Storage Facilities - Additional Information [Abstract] Disclosure Investment In Storage Facilities Additional Information [Abstract] Disclosure - Investment In Storage Facilities - Additional Information [Abstract] Disclosure Of Compensation Related Costs Share Based Payments [Text Block] STOCK BASED COMPENSATION Disclosure Organization Additional Information [Abstract] Disclosure Organization Additional Information [Abstract] Disclosure Organization Additional Information [Abstract] Disclosure - Schedule of Acquired Facilities and Purchase Price of the Facilities [Abstract] Disclosure Schedule Of Acquired Facilities And Purchase Price Of The Facilities [Abstract] Disclosure - Schedule of Acquired Facilities and Purchase Price of the Facilities [Abstract] Disclosure - Schedule of Fair Value of In-Place Customer Lease Intangible Assets [Abstract] Disclosure Schedule Of Fair Value Of In Place Customer Lease Intangible Assets [Abstract] Disclosure - Schedule of Fair Value of In-Place Customer Lease Intangible Assets [Abstract] Disclosure Stock Based Compensation Additional Information [Abstract] Disclosure Stock Based Compensation Additional Information [Abstract] Disclosure Stock Based Compensation Additional Information [Abstract] Disclosure Subsequent Events Additional Information [Abstract] Disclosure Subsequent Events Additional Information [Abstract] Disclosure Subsequent Events Additional Information [Abstract] Disclosure - Summary Of Activity In Storage Facilities [Abstract] Disclosure Summary Of Activity In Storage Facilities [Abstract] Disclosure - Summary Of Activity In Storage Facilities [Abstract] Disclosure - Summary Of Amount Reported as Discontinued Operations [Abstract] Disclosure Summary Of Amount Reported As Discontinued Operations [Abstract] Disclosure - Summary Of Amount Reported as Discontinued Operations [Abstract] Disclosure - Summary Of Derivative By Hedge Designation [Abstract] Disclosure Summary Of Derivative By Hedge Designation [Abstract] Disclosure - Summary Of Derivative By Hedge Designation [Abstract] Disclosure - Summary Of Interest Rate Swap Agreements [Abstract] Disclosure Summary Of Interest Rate Swap Agreements [Abstract] Disclosure - Summary Of Interest Rate Swap Agreements [Abstract] Disclosure - Summary Of Mortgages Payable [Abstract] Disclosure Summary Of Mortgages Payable [Abstract] Disclosure - Summary Of Mortgages Payable [Abstract] Disclosure - Summary Of Redeemable Noncontrolling Interest [Abstract] Disclosure Summary Of Redeemable Noncontrolling Interest [Abstract] Disclosure - Summary Of Redeemable Noncontrolling Interest [Abstract] Disclosure - Summary Of The Debt Obligation And Interest Rate Derivatives [Abstract] Disclosure Summary Of The Debt Obligation And Interest Rate Derivatives [Abstract] Disclosure - Summary Of The Debt Obligation And Interest Rate Derivatives [Abstract] Disclosure - Summary Of The Unconsolidated Joint Ventures' Financial Statements [Abstract] Disclosure Summary Of The Unconsolidated Joint Ventures Financial Statements [Abstract] Disclosure - Summary Of The Unconsolidated Joint Ventures' Financial Statements [Abstract] Disclosure - Unsecured Line Of Credit And Term Notes - Additional Information [Abstract] Disclosure Unsecured Line Of Credit And Term Notes Additional Information [Abstract] Disclosure - Unsecured Line Of Credit And Term Notes - Additional Information [Abstract] Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Net realized gain on sale of property Gain (loss) on disposal from discontinued operations Gain on sale of non-strategic storage facilities Gain on sale of storage facilities Disposal group including discontinued operation depreciation and amortization expense. Disposal Group Including Discontinued Operation Depreciation And Amortization Expense Depreciation and amortization expense Disposal Group Including Discontinued Operation Operating Expense Property operations and maintenance expense Disposal group including discontinued operation real estate tax expense. Disposal Group Including Discontinued Operation Real Estate Tax Expense Real estate tax expense Disposal Group Including Discontinued Operation Revenue Total revenue Disposal Groups Including Discontinued Operations Disclosure [Text Block] DISCONTINUED OPERATIONS Distributions On Mandatorily Redeemable Securities Distributions Dividend Payable Date To Be Paid Day Month And Year Dividend paid, date The aggregate amount of dividends declared and paid after the balance sheet date. Dividends Declared And Paid After Balance Sheet Date Dividend paid Dividends Payable Amount Per Share Dividend per common share Dividends Payable Date Declared Day Month And Year Dividend declared, date Dividends Payable Date Of Record Day Month And Year Dividend record, date Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Information [Table] Document Information [Table] Document Period End Date Document Period End Date Document Type Document Type Due From Related Parties Receivable from unconsolidated joint ventures Due To Related Parties Current And Noncurrent Due to the Company Earnings Per Share Basic Basic earnings per common share attributable to common shareholders Earnings per share-basic Earnings Per Share Diluted Diluted earnings per common share attributable to common shareholders Earnings per share-diluted Earnings Per Share [Text Block] Earnings Per Share Entity Central Index Key Entity Central Index Key Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Entity [Domain] Entity [Domain] Entity Filer Category Entity Filer Category Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Equity Method Investee Name [Domain] Equity Method Investee, Name [Domain] Equity Method Investment Difference Between Carrying Amount And Underlying Equity Excess of investment over net asset due to capitalization of acquisition related costs Equity Method Investment Dividends Or Distributions Distributions from unconsolidated joint venture Equity Method Investment Ownership Percentage Ownership interest Equity Method Investments Investment at carrying value Investment in unconsolidated joint ventures Equity Method Investments Disclosure [Text Block] INVESTMENT IN JOINT VENTURES Equity Method Investments [Text Block] Summary of the Unconsolidated Joint Ventures' Financial Statements Equity Method Investment Summarized Financial Information Equity Total Partners' Equity (deficiency) Equity Method Investment Summarized Financial Information Equity Or Capital Company equity (deficiency) Equity Method Investment Summarized Financial Information Liabilities And Equity Total Liabilities and Partners' Equity (deficiency) Equity Method Investment Summarized Financial Information Net Income Loss Net income Equity Method Investment Summarized Financial Information Revenue Total revenues Equity Method Investment Summarized Financial Information Unaffiliated partners' equity (deficiency). Equity Method Investment Summarized Financial Information Unaffiliated Partners Equity Deficiency Unaffiliated partners' equity (deficiency) Equity Offering Disclosure [Text Block] Equity Offering Disclosure [Text Block] Equity Offering Equity Offering Program [Axis] Equity Offering Program [Axis] Equity Offering Program [Axis] Equity Offering Program [Domain] Equity Offering Program [Domain] Equity Offering Program [Domain] Equity Offering Program [Line Items] Equity Offering Program [Line Items] Equity Offering Program [Line Items] Equity Program [Member] Equity Program [Member] Equity Program [Member] Estimated future benefit period for amortizes in-place customer leases on straight-line basis. Estimated Future Benefit Period For Amortizes In Place Customer Leases On Straight Line Basis Amortization period for in-place customer leases on a straight-line basis Estimated payment to be made under Interest rate agreement. Estimated Payment To Be Made Under Interest Rate Agreement Estimated payments to be made under interest rate swaps Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring Basis [Table] Fair Value By Fair Value Hierarchy Level [Axis] Fair Value, Hierarchy [Axis] Fair Value Inputs Level 2 [Member] Level 2 [Member] Fair Value Liabilities Measured On Recurring Basis [Text Block] Assets and Liabilities Carried at Fair Value Measured on Recurring Basis Fair Value Measurement Inputs Disclosure [Text Block] FAIR VALUE MEASUREMENTS Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Of Assets Acquired In-Place Customers Leases Financial Instrument [Axis] Financial Instrument [Axis] Finite Lived Intangible Asset Acquired In Place Leases In-place customer leases Finite Lived Intangible Assets Accumulated Amortization Accumulated amortization Finite Lived Intangible Assets Amortization Expense Recognized Current Fiscal Year Finite Lived Intangible Assets Amortization Expense Recognized Current Fiscal Year Amortization expense Finite Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finite Lived Intangible Assets Net Net carrying value at the end of period Five Point Nine Nine Percent Mortgage Note Due May Two Thousand Twenty-Six [Member]. Five Point Nine Nine Percent Mortgage Note Due May Two Thousand Twenty Six [Member] 5.99% Mortgage Note Due May 2026 [Member] Fixed Interest Rate. Fixed Interest Rate [Member] Fixed Interest Rate [Member] Florida [Member] Florida [Member] Florida [Member] General And Administrative Expense General and administrative Geographic Operations [Axis] Geographic Operations [Axis] Geographic Operations [Axis] Geographic Operations [Domain] Geographic Operations [Domain] Geographic Operations [Domain] Georgia [Member] Georgia [Member] Georgia [Member] Illinois [Member] Illinois [Member] Illinois [Member] Improvements, equipment additions, and construction in progress. Improvements Equipment Additions And Construction In Progress Improvements, equipment additions, and construction in progress Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle Per Basic Share [Abstract] Earnings per common share attributable to common shareholders-basic Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle Per Diluted Share [Abstract] Earnings per common share attributable to common shareholders-diluted Income Loss From Continuing Operations Net income from continuing operations attributable to common shareholders Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest Income from continuing operations Income Loss From Continuing Operations Per Basic Share Basic earnings per common share from continuing operations attributable to common shareholders Continuing operations Income Loss From Continuing Operations Per Diluted Share Continuing operations Diluted earnings per common share from continuing operations attributable to common shareholders Income Loss From Discontinued Operations Net Of Tax Income from discontinued operations (including gain on disposal of $4,498 in 2012) Total income from discontinued operations Income Loss From Discontinued Operations Net Of Tax Per Basic Share Discontinued operations Income Loss From Discontinued Operations Net Of Tax Per Diluted Share Discontinued operations Income Loss From Equity Method Investments Company's share in (loss) income of joint venture Equity in income (losses) of joint ventures Equity in (income) losses of joint ventures Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Income Tax Disclosure [Text Block] Income Taxes Increase Decrease In Accounts Receivable Accounts receivable Increase Decrease In Deferred Revenue Deferred revenue Increase Decrease In Operating Capital [Abstract] Changes in assets and liabilities (excluding the effects of acquisitions): Increase Decrease In Other Accounts Payable And Accrued Liabilities Accounts payable and other liabilities Increase Decrease In Prepaid Expense Prepaid expenses Incremental Common Shares Attributable To Share Based Payment Arrangements Stock options, warrants and non-vested stock Interest Expense Interest expense Interest Paid Cash paid for interest, net of interest capitalized Interest Rate Derivative Liabilities At Fair Value Fair value of interest rate swap agreements Interest rate derivatives - liability Interest rate for mortgage notes acquired Interest Rate For Mortgage Notes Acquired Interest rate for mortgage notes acquired Interest Rate Swap Five [Member] Interest Rate Swap Five [Member] Interest Rate Swap Five [Member] Interest Rate Swap Four [Member] Interest Rate Swap Four [Member] Interest Rate Swap Four [Member] Interest Rate Swap [Member] Interest Rate Swap [Member] Interest Rate Swap One [Member] Interest Rate Swap One [Member] Interest Rate Swap One [Member] Interest Rate Swap Three [Member] Interest Rate Swap Three [Member] Interest Rate Swap Three [Member] Interest Rate Swap Two [Member] Interest Rate Swap Two [Member] Interest Rate Swap Two [Member] Investment Building And Building Improvements Investment in office building Investment Income Interest Interest income Iskalo Office Holdings, LLC. Iskalo Office Holdings Llc [Member] Iskalo Office Holdings, LLC [Member] Land Land Legal Entity [Axis] Legal Entity [Axis] Liabilities Total liabilities Total Liabilities Liabilities [Abstract] Liabilities Liabilities And Stockholders Equity Total Liabilities and Shareholders' Equity Line Of Credit Line of credit Line Of Credit Facility [Axis] Lender Name [Axis] Line of credit facility, Commitment Extension Fee Percentage Line Of Credit Facility Commitment Extension Fee Percentage Extension facility fee Line Of Credit Facility Commitment Fee Percentage Facility fee Line Of Credit Facility Expiration Date 1 Line of credit facility, expiration date Line Of Credit Facility Interest Rate At Period End Interest rate, line of credit facility Line Of Credit Facility Lender [Domain] Line of Credit Facility, Lender [Domain] Line Of Credit Facility Maximum Borrowing Capacity Revolving line of credit facility agreement Line of credit facility, maximum borrowing capacity on expansion Line Of Credit Facility Maximum Borrowing Capacity On Expansion Revolving line of credit facility expandable amount Line Of Credit Facility Remaining Borrowing Capacity Amount available on unsecured line of credit Line Of Credit Facility Variable Interest Rate Libor Plus Two Point Zero Percent [Member] Line Of Credit Facility Variable Interest Rate Libor Plus Two Point Zero Percent [Member] Line Of Credit - Variable Rate LIBOR + 2.0% (2.22% At September30, 2012) [Member] Locke Sovran II LLC [Member] Locke Sovran Ii Llc [Member] Locke Sovran II, LLC [Member] Long Term Debt Maturities Repayments Of Principal After Year Five Payables due Thereafter Long Term Debt Maturities Repayments Of Principal In Next Twelve Months Payables due 2012 Long Term Debt Maturities Repayments Of Principal In Year Five Payables due 2016 Long Term Debt Maturities Repayments Of Principal In Year Four Payables due 2015 Long Term Debt Maturities Repayments Of Principal In Year Three Payables due 2014 Long Term Debt Maturities Repayments Of Principal In Year Two Payables due 2013 Long Term Debt [Text Block] UNSECURED LINE OF CREDIT AND TERM NOTES Management and call center fee as a percentage of revenue earned by the Company. Management And Call Center Fee As Percentage Of Revenue Earned By Company Management and call center fee as a percentage of revenue Management and call center fee earned by the Company. Management And Call Center Fee Earned By Company Management and call center fee earned Maryland [Member] Maryland [Member] Maryland [Member] Michigan [Member] Michigan [Member] Michigan [Member] Minimum percentage of taxable income to be distributed to shareholders by REIT to get corporate income tax exemption. Minimum Percentage Of Taxable Income To Be Distributed To Shareholders By Reit To Get Corporate Income Tax Exemption Minimum percentage of taxable income to be distributed to shareholders by REIT to get corporate income tax exemption Minority Interest Change In Redemption Value Adjustment to redemption value Minority Interest Ownership Percentage By Parent Percentage ownership in unconsolidated joint venture Mortgage Loan On Real Estate Final Maturity Date Mortgage note due date Mortgage note acquired Mortgage Note Acquired Mortgage note acquired Mortgage Note Fixed Interest Rate Five Point Ninety Nine Percent [Member] Mortgage Note Fixed Interest Rate Five Point Ninety Nine Percent [Member] Mortgage Note Fixed Interest Rate Five Point Ninety Nine Percent [Member] Mortgage Note Fixed Interest Rate Six Point Seventy Six Percent [Member] Mortgage Note Fixed Interest Rate Six Point Seventy Six Percent [Member] Mortgage Note Fixed Interest Rate Six Point Seventy Six Percent [Member] Mortgage Note Fixed Interest Rate Six Point Thirty Five Percent [Member] Mortgage Note Fixed Interest Rate Six Point Thirty Five Percent [Member] Mortgage Note Fixed Interest Rate Six Point Thirty Five Percent [Member] Mortgage Notes Payable Disclosure [Text Block] MORTGAGES PAYABLE AND DEBT MATURITIES Net Assets Of Discontinued Operations Net Assets Of Discontinued Operations Net assets of discontinued operations Net Cash Provided By Used In Financing Activities Net cash provided by financing activities Net Cash Provided By Used In Financing Activities [Abstract] Financing Activities Net Cash Provided By Used In Investing Activities Net cash used in investing activities Net Cash Provided By Used In Investing Activities [Abstract] Investing Activities Net Cash Provided By Used In Operating Activities Net cash provided by operating activities Net Cash Provided By Used In Operating Activities [Abstract] Operating Activities Net Income Loss Net loss Net income attributable to common shareholders Net Income Loss Attributable To Noncontrolling Interest Net income attributable to noncontrolling interests Net income attributable to noncontrolling interest Noncontrolling interest repayment. Noncontrolling Interest Repayment Noncontrolling interest repayment Nonoperating Income Expense [Abstract] Other income (expenses) North Carolina [Member] North Carolina [Member] North Carolina [Member] Notes Payable Term notes Unsecured term note Notes Payable Fair Value Disclosure Term note, fair value Notional Amount Of Interest Rate Derivatives Notional amount Number Of Businesses Acquired Number of Properties Number of non-strategic storage facilities sold by company. Number Of Non Strategic Storage Facilities Sold By Company Number of non-strategic storage facilities sold by company Number of One year Extensions Number Of One Year Extensions Number of one year extensions Number Of Properties Managed For Consolidated Joint Venture Twenty Percent Ownership Number Of Properties Managed For Consolidated Joint Venture Twenty Percent Ownership Number of properties twenty-percent owned under consolidated joint venture Number of properties managed with no ownership Number Of Properties Managed With No Ownership Number of properties managed with no ownership Number of properties owned and managed under fifteen percent stake joint venture Number Of Properties Owned And Managed Under Fifteen Percent Stake Joint Venture Number of properties owned and managed under fifteen-percent stake joint venture Number of properties owned and managed under Twenty Percent stake joint venture. Number Of Properties Owned And Managed Under Twenty Percent Stake Joint Venture Number of properties owned and managed under twenty-percent stake joint venture Number Of Real Estate Properties Number of self-storage properties owned and managed Number of self-storage facilities acquired. Number Of Self Storage Facilities Acquired Number of storage facilities acquired Number Of States In Which Entity Operates Number of states in which self-storage properties owned and managed Numerator [Abstract] Numerator [Abstract] Numerator: Operating Income Loss Income from operations Operating Leases Income Statement Minimum Lease Revenue Rental income Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] ORGANIZATION Organization [Line Items] Organization [Line Items] Organization [Line Items] Organization [Table] Organization [Table] Organization [Table] Other Assets Other assets Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax Change in fair value of derivatives net of reclassification to interest expense (Loss) gain included in other comprehensive income (loss) Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Other comprehensive income: Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax Realized loss reclassified to interest expense Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax Unrealized loss from changes in the fair value of the effective portion of the interest rate swaps Other Depreciation And Amortization Depreciation and amortization Other Expenses Other expenses Other Liabilities Other liabilities Other Operating Income Other operating income Other Stockholders Equity. Other Stockholders Equity Additional investment in Locke Sovran II LLC Payments For Proceeds From Deposits On Real Estate Acquisitions Reimbursement of (payment of) property deposits Payments For Repurchase Of Redeemable Noncontrolling Interest Redemption of operating partnership units Payments Of Dividends Common Stock Dividends paid-common stock Payments Of Dividends Minority Interest Distributions to noncontrolling interest holders Payments Of Financing Costs Financing costs Payments Of Stock Issuance Costs Offering related costs and commissions Payments To Acquire Businesses And Interest In Affiliates Payments to acquire businesses and interest in affiliates Payments To Acquire Equity Method Investments Contribution of company to joint venture as share in capital Payments to acquire preferred interest in affiliates Payments To Acquire Preferred Interest In Affiliates Payments to acquire preferred interest in affiliates Payments To Acquire Real Estate Acquisitions of storage facilities Payments To Acquire Real Estate And Real Estate Joint Ventures Investment in unconsolidated joint ventures Payments To Minority Shareholders Payments to noncontrolling interests Percentage ownership in consolidated joint venture Percentage Ownership In Consolidated Joint Venture Percentage ownership in consolidated joint venture Preferred Interest In Investment Preferred Interest In Investment Preferred interest in investment Prepaid Expense Current And Noncurrent Prepaid expenses Proceeds From Divestiture Of Businesses Sales of non-strategic storage facilities Proceeds From Issuance Of Common Stock Proceeds from issuance of common stock Proceeds From Issuance Or Sale Of Equity Net proceeds from sale of common stock Proceeds From Long Term Lines Of Credit Proceeds from line of credit Proceeds From Sale Of Real Estate Heldforinvestment Net proceeds from the sale of storage facilities Profit Loss Net income Net income Property acquisition related costs included in other expenses. Property Acquisition Related Costs Included In Other Expenses Property acquisition related costs included in other expenses Real Estate Disclosure [Text Block] INVESTMENT IN STORAGE FACILITIES Real Estate Improvements Improvements and equipment additions Real Estate Investment Property Accumulated Depreciation Accumulated Depreciation: Ending balance Accumulated Depreciation: Beginning balance Less: accumulated depreciation Real Estate Investment Property At Cost Cost: Ending balance Cost: Beginning balance Real estate investment property, at cost, total Real estate investment property depreciation dispositions. Real Estate Investment Property Depreciation Dispositions Dispositions Real Estate Investment Property Net Investment in storage facilities, net Investment in storage facilities, net Real Estate Investment Property Net [Abstract] Investment in storage facilities: Real estate net decrease in construction in progress Real Estate Net Decrease In Construction In Progress Net decrease in construction in progress Real Estate Other Deductions Dispositions and impairments Real Estate Tax Expense Real estate taxes Redeemable Noncontrolling Interest Equity Common Fair Value Ending balance noncontrolling redeemable Operating Partnership Units Beginning balance noncontrolling redeemable Operating Partnership Units Noncontrolling redeemable Operating Partnership Units at redemption value Redeemable Noncontrolling Interest in Operating Partnerships units Redeemable Noncontrolling Interest In Operating Partnerships Units Units of redeemable noncontrolling interest in operating partnership Redeemable Noncontrolling Interest Table [Text Block] Summary of Redeemable Noncontrolling Interest Redemption Premium Redemption value in excess of carrying value Repayments Of First Mortgage Bond Mortgage principal payments Repayments Of Long Term Lines Of Credit Repayments of line of credit Restricted Stock Expense Stock based compensation expense related to amortization of non-vested stock Restricted Stock [Member] Restricted Stock [Member] Revenues Operating revenues Total operating revenues Revenues [Abstract] Revenues Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule Of Derivative Instruments [Text Block] Summary of Interest Rate Swap Agreements Schedule Of Disposal Groups Including Discontinued Operations Income Statement Balance Sheet And Additional Disclosures [Text Block] Summary of Amount Reported as Discontinued Operations Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Computation of Basic and Diluted Earnings Per Common Share Schedule Of Equity Method Investment Equity Method Investee Name [Axis] Equity Method Investee, Name [Axis] Schedule Of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Schedule Of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Schedule Of Equity Offering Program [Table] Schedule Of Equity Offering Program [Table] Schedule Of Equity Offering Program [Table] Schedule Of Finite Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Schedule Of Income Taxes [Line Items] Schedule Of Income Taxes [Line Items] Schedule Of Income Taxes [Line Items] Schedule Of Income Taxes [Table] Schedule Of Income Taxes [Table] Schedule Of Income Taxes [Table] Schedule Of Investments In Real Estate [Line Items] Schedule Of Investments In Real Estate [Line Items] Schedule Of Investments In Real Estate [Line Items] Schedule Of Investments In Real Estate [Table] Schedule Of Investments In Real Estate [Table] Schedule Of Investments In Real Estate [Table] Schedule Of New Accounting Pronouncements And Changes In Accounting Principles [Text Block] Recent Accounting Pronouncements Schedule Of Other Assets Table [Text Block] Schedule of Fair Value of In-Place Customer Lease Intangible Assets Schedule Of Purchase Price Allocation Table [Text Block] Schedule of Acquired Facilities and Purchase Price of the Facilities Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule Of Stock By Class [Table] Schedule of Stock by Class [Table] Schedule Of Subsequent Events [Text Block] Subsequent Events Secured Debt Mortgage note , total Mortgages payable Share Based Compensation Non-vested stock earned Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Number of Shares of non-vested stock that vested Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Six Point Seven Six Percent Mortgage Note Due September Two Thousand Thirteen [Member] Six Point Seven Six Percent Mortgage Note Due September Two Thousand Thirteen [Member] 6.76% Mortgage Note Due September 2013 [Member] Six Point Three Five Percent Mortgage Note Due March Two Thousand Fourteen [Member] Six Point Three Five Percent Mortgage Note Due March Two Thousand Fourteen [Member] 6.35% Mortgage Note Due March 2014 [Member] Sovran HHF Storage Holdings II LLC [Member] Sovran Hhf Storage Holdings Ii Llc [Member] Sovran HHF Storage Holdings II LLC [Member] Sovran HHF Storage Holdings LLC And Sovran HHF Storage Holdings II LLC [Member] Sovran Hhf Storage Holdings Llc And Sovran Hhf Storage Holdings Ii Llc [Member] Sovran HHF And Sovran HHF II [Member] Sovran HHF Storage Holdings LLC. Sovran Hhf Storage Holdings Llc [Member] Sovran HHF Storage Holdings LLC [Member] Sovran HHF Storage Holdings Sovran Hhf Storage Holdings [Member] Sovran HHF Storage Holdings LLC [Member] Sovran HHF Storage Holdings Two Sovran Hhf Storage Holdings Two [Member] Sovran HHF Storage Holdings II LLC [Member] Statement Consolidated Balance Sheets [Abstract] Statement Consolidated Balance Sheets [Abstract] Statement Consolidated Balance Sheets [Abstract] Statement Consolidated Statements Of Cash Flows [Abstract] Statement Consolidated Statements Of Cash Flows [Abstract] Statement Consolidated Statements Of Cash Flows [Abstract] Statement Consolidated Statements Of Comprehensive Income [Abstract] Statement Consolidated Statements Of Comprehensive Income [Abstract] Statement Consolidated Statements Of Comprehensive Income [Abstract] Statement C O N S O L I D A T E D S T A T E M E N T S O F O P E R A T I O N S [Abstract] Statement C O N S O L I D A T E D S T A T E M E N T S O F O P E R A T I O N S [Abstract] Statement C O N S O L I D A T E D S T A T E M E N T S O F O P E R A T I O N S [Abstract] Statement [Line Items] Statement [Line Items] Statement [Table] Statement [Table] Stockholders Equity Total Shareholders' Equity Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] Shareholders' Equity Stockholders Equity Other Additional investment in Locke Sovran II, LLC Stock Issued During Period Shares Stock Options Exercised Stock options exercised by employees Stock Option Plan Expense Stock based compensation expense related to stock options Stock option expense Stock Options [Member] Stock Options [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent [Member] Subsequent [Member] Subsequent [Member] Subsidiary Of Limited Liability Company Or Limited Partnership Ownership Interests. Subsidiary Of Limited Liability Company Or Limited Partnership Ownership Interests Percentage of ownership interest of the Subsidiary and its limited partnership which controls the operations of the Operating Partnership Summary of the activity in storage facilities. Summary Of Activity In Storage Facilities Table [Text Block] Summary of Activity in Storage Facilities Summary of Debt Obligations And Interest Rate Derivatives [Text Block] Summary Of Debt Obligations And Interest Rate Derivatives [Text Block] Summary of the Debt Obligation and Interest Rate Derivatives Summary of Mortgage Payable [Text Block] Summary Of Mortgage Payable [Text Block] Summary of Mortgage Payable Supplemental Cash Flow Information [Abstract] Supplemental cash flow information Taxes Payable Current Current taxes payable Tax years open to examination. Tax Years Open To Examination Tax years open to examination Term Note Fixed Rate Five Point Five Four Percent [Member] Term Note Fixed Rate Five Point Five Four Percent [Member] Term Note - Fixed Rate 5.54% [Member] Term Note Fixed Rate Six Point Three Eight Percent [Member] Term Note Fixed Rate Six Point Three Eight Percent [Member] Term Note - Fixed Rate 6.38% [Member] Term Note Fixed Rate Six Point Two Six Percent [Member] Term Note Fixed Rate Six Point Two Six Percent [Member] Term Note - Fixed Rate 6.26% [Member] Term Note Variable Interest Rate Libor Plus One Point Five Zero Percent [Member] Term Note Variable Interest Rate Libor Plus One Point Five Zero Percent [Member] Term Note - Variable Rate LIBOR+1.50% (2.21% At September30, 2012) [Member] Term Note Variable Interest Rate Libor Plus Two Percent One [Member] Term Note Variable Interest Rate Libor Plus Two Percent One [Member] Term Note Variable Interest Rate Libor Plus Two Percent One [Member] Term Note Variable Interest Rate Libor Plus Two Percent Two [Member] Term Note Variable Interest Rate Libor Plus Two Percent Two [Member] Term Note Variable Interest Rate Libor Plus Two Percent Two [Member] Term Note Variable Interest Rate Libor Plus Two Point Zero Percent, Two Point Two Five At June Thirtieth Two Thousand Twelve Member Term Note Variable Interest Rate Libor Plus Two Point Zero Percent Two Point Two Five At June Thirtieth Two Thousand Twelve [Member] Term note - variable rate LIBOR+2.0% (2.22% At September30, 2012) [Member] Term Note Variable Interest Rate LIBOR Plus Two Point Zero Percent Two Point Two Five [Member] Term Note Variable Interest Rate L I B O R Plus Two Point Zero Percent Two Point Two Five [Member] Term Note - Variable Rate LIBOR+2.0% (2.22% at September 20, 2012) One [Member] Term Note Variable Interest Rate Libor Plus Two Point Zero Percent, Two Point Two Four At June Thirtieth Two Thousand Twelve [Member] Term Note Variable Interest Rate Libor Plus Two Point Zero Percent Two Point Two Four At June Thirtieth Two Thousand Twelve [Member] Term note - variable rate LIBOR+2.0% (2.23% At September30, 2012) [Member] Term Note Variable Interest Rate Libor Plus Two Point Zero Percent (Two Point Two Four) [Member] Term Note Variable Interest Rate Libor Plus Two Point Zero Percent Two Point Two Four [Member] Term Note - Variable Rate LIBOR+2.0% (2.23% at September 20, 2012) One [Member] Texas [Member] Texas [Member] Texas [Member] Text Block [Abstract] Text Block [Abstract] Trading Symbol Trading Symbol Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Types of Financial Instruments [Domain] Treasury Stock Shares Treasury stock at cost, shares Treasury Stock Value Treasury stock at cost, 1,171,886 shares Unrecognized Tax Benefits Unrecognized tax benefits Unrecognized Tax Benefits Income Tax Penalties And Interest Expense Interest or penalties related to uncertain tax positions Unsecured Line Of Credit And Term Notes [Line Items] Unsecured Line Of Credit And Term Notes [Line Items] Unsecured Line Of Credit And Term Notes [Line Items] Unsecured Line Of Credit And Term Notes [Table] Unsecured Line Of Credit And Term Notes [Table] Unsecured Line Of Credit And Term Notes [Table] Unsecured term note maturing in April 2016. Unsecured Term Note Maturing In April 2016 [Member] Maturity In April 2016 [Member] Unsecured Term Note Maturing In August Two Thousand Eighteen [Member] Unsecured Term Note Maturing In August Two Thousand Eighteen [Member] Maturity In August 2018 [Member] Unsecured Term Note Maturing In August Two Thousand Sixteen [Member] Unsecured Term Note Maturing In August Two Thousand Sixteen [Member] Maturity In August 2016 [Member] Unsecured Term Note Maturing In August Two Thousand Twenty One [Member] Unsecured Term Note Maturing In August Two Thousand Twenty One [Member] Maturity In August 2021 [Member] Unsecured Term note maturing September 2013. Unsecured Term Note Maturing September 2013 [Member] Maturity In September 2013 [Member] Virginia [Member] Virginia [Member] Virginia [Member] Weighted Average Number Of Diluted Shares Outstanding Common shares used in diluted earnings per share calculation Denominator for diluted earnings per share-adjusted weighted average shares and assumed conversion Weighted Average Number Of Shares Outstanding Basic Common shares used in basic earnings per share calculation Denominator for basic earnings per share-weighted average shares West Deptford JV LLC [Member] West Deptford Jv Llc [Member] West Deptford JV LLC [Member]