Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments [Member] Operating Segments [Member] Corporate, Non-Segment [Member] Corporate, Non-Segment [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Carolinas Richmond [Member] Carolinas Richmond [Member] Carolinas Richmond [Member] Chicago Minneapolis [Member] The Company's reportable segment of Chicago/Minneapolis. Florida [Member] Florida [Member] Area in the state of Florida which formally included the segments Tampa, Orlando and South Florida. Houston [Member] Houston [Member] Houston Reportable Segment Lehigh Central PA [Member] Lehigh Central PA [Member] Lehigh Central PA [Member] Minnesota [Member] Minnesota [Member] Minnesota Reportable Segment Philadelphia [Member] Philadelphia [Member] Philadelphia [Member] Southeastern PA [Member] Southeastern PA [Member] Southeastern PA United Kingdom [Member] United Kingdom [Member] United Kingdom Member. Other Segments [Member] Other Segments [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] North America [Member] North America [Member] United Kingdom [Member] UNITED KINGDOM Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Assets Assets Share-based Compensation [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Long Term Incentive Shares [Member] Long Term Incentive Shares [Member] Long Term Incentive Shares [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock [Member] Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Nonvested at January 1, 2016 (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Nonvested at December 31, 2016 (shares) Weighted Avg. Grant Date Fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Nonvested at January 1, 2016 (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Nonvested at December 31, 2016 (USD per share) Shareholders' Equity [Abstract] Shareholders' Equity [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Stock Conversion Description [Axis] Stock Conversion Description [Axis] Conversion of Stock, Name [Domain] Conversion of Stock, Name [Domain] Conversion Ratio of Common Units to Common Shares [Member] Conversion Ratio of Common Units to Common Shares [Member] Conversion Ratio of Common Units to Common Shares [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Liberty Property Limited Partnership [Member] Liberty Property Limited Partnership [Member] Limited Partnership. Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] 2015 Share Repurchase Program [Member] 2015 Share Repurchase Program [Member] Share repurchase program authorized by the Board of Trustees in 2015. 2017 Share Repurchase Program [Member] 2017 Share Repurchase Program [Member] 2017 Share Repurchase Program [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common units [Member] Common Class B [Member] Common shares [Member] Common Class A [Member] Class of Stock [Line Items] Class of Stock [Line Items] Common Shares Dividends, Common Stock [Abstract] Common units distributions (USD per share) Dividends, Common Stock, Cash Ordinary dividend (USD per share) Common Stock, Ordinary Dividend, Per Share, Cash Paid Common Stock, Ordinary Dividend, Per Share, Cash Paid Qualified dividend (USD per share) Common Stock, Qualified Dividend, Per Share, Cash Paid Common Stock, Qualified Dividend, Per Share, Cash Paid Capital gain - 20% (USD per share) Common Stock, Capital gain 20%, Per Share, Cash Paid Common Stock, Capital gain 20%, Per Share, Cash Paid IRC Sec 1250 unrecapture gain - 25% (USD per share) Common Stock, IRC SEC 1250 unrecaptured gain 25%, Per Share, Cash Paid Common Stock, IRC SEC 1250 unrecaptured gain 25%, Per Share, Cash Paid Return of capital (USD per share) Common Stock, Return of Capital, Per Share, Cash Paid Common Stock, Return of Capital, Per Share, Cash Paid Total (USD per share) Common Stock, Dividends, Per Share, Cash Paid Common Units Common Units [Abstract] Common Units [Abstract] Common units outstanding Limited Partners' Capital Account, Units Outstanding Common unit, convertible to common stock Common Unit, Convertible to Common Stock Common Unit, Convertible to Common Stock Common stock, converted from common unit Common Stock, Converted from Common Unit Common Stock, Converted from Common Unit Closing price of the common shares Redeemable Noncontrolling Interest, Equity, Common, Fair Value Units issued in connection with acquisitions Partners' Capital Account, Units, Acquisitions Dividend Reinvestment and Share Purchase Plan Dividend Reinvestment and Share Purchase Plan [Abstract] Plan under which holders of common shares may automatically reinvest their distributions in additional common shares and make optional cash payments for additional common shares. Dividend reinvestment plan Stock Issued During Period, Shares, Dividend Reinvestment Plan Continuous Equity Offering Continuous Equity Offering [Abstract] The continuous equity offering plan is a way for the Company to continously sell shares to the public market [Abstract] Maximum equity capacity Equity Offering Program, Maximum Equity Capacity Equity Offering Program, Maximum Equity Capacity Equity available Equity Offering Program, Equity Available Equity Offering Program, Equity Available Shares issued during period under continuous equity offerings, shares, new issues Shares issued during period under continuous equity offerings, shares, new issues Shares issued during period under continuous equity offerings, shares, new issues Share Repurchase Share Repurchase [Abstract] Share Repurchase [Abstract] Stock repurchase program, authorized amount Stock Repurchase Program, Authorized Amount Share repurchase, shares Stock Repurchased During Period, Shares Share repurchase, value Stock Repurchased During Period, Value Accounting Policies [Abstract] Income Tax Contingency [Table] Income Tax Contingency [Table] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Cash [Member] Cash [Member] Noncash [Member] Noncash [Member] Assets other than cash Tax Period [Axis] Tax Period [Axis] Tax Period [Domain] Tax Period [Domain] Tax Year 2018 [Member] Tax Year 2018 [Member] Tax Year 2018 [Member] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Tax Cuts and Jobs Act [Member] Tax Cuts and Jobs Act [Member] The tax act signed into law December 22, 2017. Taxable REIT Subsidiary [Member] Taxable REIT Subsidiary [Member] Income Tax Contingency [Line Items] Percent distribution of REIT taxable income Distribution of REIT Taxable Income % of REIT Taxable Income distributed to shareholders Income provision Current Federal Tax Expense (Benefit) Number of years subequent to a failed REIT Qualifing Test the Company would not be Qualified as a REIT Number of years subequent to a failed REIT Qualifing Test the Company would not be Qualified as a REIT Number of years subequent to a failed REIT Qualifing Test the Company would not be Qualified as a REIT Effective income tax rate for repatriation of foreign earnings Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent Uncertain tax positions Liability for Uncertainty in Income Taxes, Current Penalties and interest Income Tax Examination, Penalties and Interest Expense Penalties and interest accrued Income Tax Examination, Penalties and Interest Accrued Operating loss carryforwards Operating Loss Carryforwards Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Valuation allowance Deferred Tax Assets, Valuation Allowance Expiration dates Operating Loss Carryforwards, Expiration Date Federal income tax basis SEC Schedule III, Real Estate, Federal Income Tax Basis Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction, Including Discontinued Operations The concept Depreciation, Depletion and Amortization, Nonproduction but to also include the amount for discontinued operations. Amortization of deferred financing costs Amortization of Debt Issuance Costs Expensed pursuit costs Other General and Administrative Expense Impairment - real estate assets Impairment of real estate, including discontinued operations Impairment of real estate concept including amounts allocated to discontinued operations Loss on debt extinguishment Gain (Loss) on Extinguishment of Debt Equity in earnings of unconsolidated joint ventures Income (Loss) from Equity Method Investments Distributions from unconsolidated joint ventures Proceeds from Equity Method Investment, Distribution Gain on property dispositions Gain (Loss) on Sale of Properties Share-based compensation Share-based Compensation Other Other Operating Activities, Cash Flow Statement Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Deferred rent receivable Straight Line Rent Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued interest Increase (Decrease) in Interest Payable, Net Other liabilities Increase (Decrease) in Other Operating Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Investment in properties – acquisitions Payments to Acquire Buildings Investment in properties – other Payments for Capital Improvements Investments in and advances to unconsolidated joint ventures Payments to Acquire Equity Method Investments Distributions from unconsolidated joint ventures Proceeds from Equity Method Investment, Distribution, Return of Capital Net proceeds from disposition of properties/land Proceeds from Sale of Real Estate Held-for-investment Investment in development in progress Payments to Develop Real Estate Assets Investment in land held for development Payments To Acquire And Develop Land The cash outflow associated with the purchase of or development of land held for investment. Payment of deferred leasing costs Payments for Leasing Costs Increase in escrows Increase (Decrease) in Deposit Assets Other Payments for (Proceeds from) Other Investing Activities Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Investing Activities FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Net proceeds from issuance of common shares Proceeds from Issuance of Common Stock Share repurchases, including shares related to tax withholdings Payments for Repurchase of Common Stock Proceeds from unsecured notes Proceeds from Issuance of Unsecured Debt Repayments of unsecured notes including prepayment premium Repayments of Unsecured Debt Repayments of mortgage loans Repayments of Secured Debt Proceeds from credit facility Proceeds from Long-term Lines of Credit Repayments on credit facility Repayments of Long-term Lines of Credit Payment of deferred financing costs Payments of Financing Costs Capital contributions Proceeds from Contributed Capital Distributions to partners/noncontrolling interests Payments of Capital Distribution Distribution paid on common shares Payments of Ordinary Dividends, Common Stock Distribution paid on units/noncontrolling interests Payments of Ordinary Dividends, Noncontrolling Interest Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Net (decrease) increase in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Increase (decrease) in cash, cash equivalents and restricted cash related to foreign currency translation Effect of Exchange Rate on Cash and Cash Equivalents Cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Intangible Assets, Net (Excluding Goodwill) [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Leases, Acquired-in-Place, Market Adjustment [Member] Leases, Acquired-in-Place, Market Adjustment [Member] Leases, Acquired-in-Place [Member] Leases, Acquired-in-Place [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Schedule of Deferred Financing and Leasing Costs Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract] Real Estate and Accumulated Depreciation SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Segment Information Segment Reporting Disclosure [Text Block] Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Property Deprecation Schedule Property, Plant and Equipment [Table Text Block] Fair Value of Mortgage Loans and Unsecured Notes Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Schedule of Adjustment to Previously Reported Consolidated Financial Statements Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] Quarterly Financial Information Disclosure [Abstract] Operating revenue Revenues Net income available to common shareholders - basic (USD per share/unit) Earnings Per Share, Basic Income per common share - diluted (USD per share/unit) Earnings Per Share, Diluted Earnings Per Share [Abstract] Schedule of Earnings Per Share, Basic and Diluted [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Earnings Per Unit, Basic and Diluted [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Income Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Income from continuing operations net of noncontrolling interest Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Less: Preferred unit distributions Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable Income from continuing operations available to common unitholders Income from Continuing Operations available to Common Unitholders Income from Continuing Operations available to Common Unitholders Income from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income available to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Weighted Average Shares Weighted Average Number of Shares Outstanding, Diluted [Abstract] Income from continuing operations net of noncontrolling interest - basic (shares) Weighted Average Number of Shares Outstanding, Basic Dilutive shares/units for long-term compensation plans (shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Income from continuing operations net of noncontrolling interest - diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Per Share/Unit Earnings Per Share, Basic [Abstract] Income from continuing operations net of noncontrolling interest - basic (USD per share/unit) Income (Loss) from Continuing Operations, Per Basic Share Discontinued operations net of noncontrolling interest - basic (USD per share/unit) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Per Share Earnings Per Share, Diluted [Abstract] Income from continuing operations net of noncontrolling interest - diluted (USD per share/unit) Income (Loss) from Continuing Operations, Per Diluted Share Discontinued operations net of noncontrolling interest - diluted (USD per share/unit) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Not Primary Beneficiary [Member] Variable Interest Entity, Not Primary Beneficiary [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Investments [Member] Other Investments [Member] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Liberty Comcast 1701 JFK Boulevard, LP [Member] Liberty Comcast 1701 JFK Boulevard, LP [Member] Liberty Comcast 1701 JFK Boulevard, LP formerly known as Liberty Commerz 1701 JFK Boulevard, LP [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Ownership interest in operating partnership - Limited Partnership Noncontrolling Interest, Ownership Percentage by Parent Ownership percentage Equity Method Investment, Ownership Percentage Maximum exposure to loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Commitments and Contingencies Disclosure [Abstract] Loss Contingency, Information about Litigation Matters [Abstract] Loss Contingency, Information about Litigation Matters [Abstract] Number of legal proceedings Loss Contingency, Pending Claims, Number Quarterly Results of Operations (Unaudited) Quarterly Financial Information [Text Block] Equity [Abstract] Recently Issued Accounting Standards [Abstract] Recently Issued Accounting Standards [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-09 [Member] Accounting Standards Update 2016-09 [Member] Accounting Standards Update 2016-18 [Member] Accounting Standards Update 2016-18 [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Previously Reported [Member] Scenario, Previously Reported [Member] Adjustment [Member] Restatement Adjustment [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Financing Activities Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Real estate assets Real Estate Investment Property, Net Valuation and Qualifying Accounts [Abstract] Schedule of Valuation and Qualifying Accounts Disclosure Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Equity Method Investments and Joint Ventures [Abstract] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Investments in and advances to unconsolidated joint ventures [Member] Prepaid Expenses and Other Current Assets [Member] Prepaid Expenses and Other Current Assets [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Building and Building Improvements [Member] Building and Building Improvements [Member] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Real Estate [Domain] Real Estate [Domain] Industrial Property [Member] Industrial Property [Member] Office Building [Member] Office Building [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Kings Hill Unit Trust [Member] Kings Hill Unit Trust [Member] Kings Hill Unit Trust [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Equity Method Investee [Member] Equity Method Investee [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Number of properties Number of Real Estate Properties Leaseable square feet Net Rentable Area Notes receivable Notes Receivable, Related Parties Note receivable interest rate Related Party Transaction, Rate Due from related parties Due from Related Parties Management fees revenue Management Fees Revenue Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Table Text Block] Investments in Unconsolidated Joint Ventures Equity Method Investments and Joint Ventures Disclosure [Text Block] Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Allowance for Trade Receivable, Straight Line Rent [Member] Allowance for Trade Receivable, Straight Line Rent [Member] A valuation allowance for amounts due to an Entity for the GAAP straight line rent adjustment due to a lessor. Allowance for Trade Receivables [Member] Allowance for Trade Receivables [Member] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Movement in Valuation Allowances and Reserves [Roll Forward] Movement in Valuation Allowances and Reserves [Roll Forward] Balance at Beginning of the Year Valuation Allowances and Reserves, Balance Additions Valuation Allowances and Reserves, Additions for Charges to Cost and Expense Deductions Valuation Allowances and Reserves, Deductions Balance at End of the Year General Partner [Member] General Partner [Member] Liberty Venture I, LP [Member] Liberty Venture I, LP [Member] Liberty Venture I, LP [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Joint venture sales, 2015 [Member] Joint venture sales, 2015 [Member] Joint venture sales during the year ended December 31, 2015 Construction in Progress [Member] Construction in Progress [Member] Land and Land Improvements [Member] Land and Land Improvements [Member] New Jersey [Member] New Jersey [Member] New Jersey business segment [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Not Discontinued Operations [Member] Disposal Group, Not Discontinued Operations [Member] Anticipated aggregate investment Anticipated Aggregate Investment Total anticipated cost of investment in assets including but not limited to assets under construction. Gross proceeds Acres of developable land Area of Land Revenue from related parties Revenue from Related Parties Schedule of Condensed Balance Sheet of Equity Method Investments Schedule of Condensed Balance Sheet of Equity Method Investments [Table Text Block] Schedule of Condensed Balance Sheet of Equity Method Investments [Table Text Block] Schedule of Condensed Statements of Operations of Equity Method Investments Schedule of Condensed Statements of Operations of Equity Method Investments [Table Text Block] Schedule of Condensed Statements of Operations of Equity Method Investments [Table Text Block] Noncontrolling Interest - Operating Partnership / LImited Partners' Equity - Preferred Units [Abstract] Noncontrolling Interest - Operating Partnership / LImited Partners' Equity - Preferred Units [Abstract] Schedule of Preferred Units [Table] Schedule of Preferred Units [Table] Preferred Units by Name [Axis] Preferred Units by Name [Axis] Preferred Units, Class [Domain] Preferred Units, Class [Domain] Series I 2 [Member] Series I 2 [Member] Series I 2, name of preferred unit series Preferred Units [Line Items] Preferred Units [Line Items] Amount Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount Units (in units) Temporary Equity, Shares Outstanding Liquidation preference Temporary Equity, Liquidation Preference Per Share Dividend rate Preferred Stock, Dividend Rate, Percentage Preferred Units, Total Annual Cash Distributions Preferred Units Total Annual Cash Distributions Preferred Units Total Annual Cash Distributions Schedule of Costs Incurred on Long-lived Assets [Table] Schedule of Expenditures on Long-lived Assets [Table] Schedule of Expenditures on Long-lived Assets [Table] Cost incurred on long-lived assets Segments, Cost incurred on Long-lived Assets Segments, Cost incurred on Long-lived Assets Document Information [Abstract] Document Information [Abstract] Document Information [Table] Document Information [Table] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Concentration of Credit Risk [Abstract] Concentration of Credit Risk [Abstract] Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Sales Revenue, Net [Member] Sales Revenue, Net [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Geographic Concentration Risk [Member] Geographic Concentration Risk [Member] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Number of Customers Number of Customers Represents the number of customers Concentration Risk, Percentage Concentration Risk, Percentage Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Capital Improvements [Member[ Other Capitalized Property Plant and Equipment [Member] Equipment [Member] Machinery and Equipment [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Useful Life Property, Plant and Equipment, Useful Life Compensation costs, capitalized Compensation costs, capitalized The total amount of compensation related costs that were capitalized during the period. These costs are capitalized for the persons working on development projects. Construction related payables Construction Payable Income Statement [Abstract] Discontinued operations, net gain on property dispositions Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other Income [Member] Other Income [Member] General and Administrative Expense [Member] General and Administrative Expense [Member] Error Corrections and Prior Period Adjustments Restatement [Line Items] Error Corrections and Prior Period Adjustments Restatement [Line Items] Development service fee income Property Management Fee Revenue Development service fee expense Construction and Development Costs Shareholders' Equity - Trust Stockholders' Equity Note Disclosure [Text Block] Schedule of Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Stock Options Activity Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Key Assumptions Used in the Monte Carlo Simulation Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions [Table Text Block] Tabular disclosure of significant assumptions used during the year to estimate the fair value of restricted stock units, including but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. Schedule of Nonvested Share Activity Schedule of Nonvested Share Activity [Table Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock Option [Member] Equity Option [Member] Amount of option exercises in period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Other than Temporary Impairment Losses, Investments [Abstract] Impairment losses Other than Temporary Impairment Losses, Investments Operating Leases, Future Minimum Payments Receivable [Abstract] 2017 Operating Leases, Future Minimum Payments Receivable, Current 2018 Operating Leases, Future Minimum Payments Receivable, in Two Years 2019 Operating Leases, Future Minimum Payments Receivable, in Three Years 2020 Operating Leases, Future Minimum Payments Receivable, in Four Years 2021 Operating Leases, Future Minimum Payments Receivable, in Five Years Thereafter Operating Leases, Future Minimum Payments Receivable, Thereafter Total Operating Leases, Future Minimum Payments Receivable Liberty Illinois, LP [Member] Liberty Illinois, LP [Member] Liberty Washington, LP [Member] Liberty Washington, LP [Member] Liberty Property 18th & Arch [Member] Liberty Property 18th & Arch [Member] Liberty Property 18th & Arch includes both joint ventures that own the Comcast Innovation and Technology Center in Philadelphia Pennsylvania. Other Joint Ventures [Member] Other Joint Ventures [Member] Cambridge Medipark Ltd [Member] Cambridge Medipark Ltd [Member] Cambridge Medipark Ltd [Member] Leaseholds and Leasehold Improvements [Member] Leaseholds and Leasehold Improvements [Member] Equity Method Investment, Summarized Financial Information [Abstract] Equity Method Investment, Summarized Financial Information [Abstract] Assets Equity Method Investment, Summarized Financial Information, Assets [Abstract] Real estate assets Equity Method Investment, Summarized Financial Information, Real Estate Assets, Gross The value of gross real estate assets per equity investment, Accumulated depreciation Equity Method Investment, Summarized Financial Information, Accumulated Depreciation The amount of accumulated depreciation on real estate assets per equity investment. Real estate assets, net Equity Method Investment, Summarized Financial Information, Real Estate Assets, Net The amount of real estate assets less accumulated depreciation per equity method investment. Development in progress Equity Method Investment, Summarized Financial Information, Development in Progress The amount of development in progress per equity method investment. Land held for development Equity Method Investment, Summarized Financial Information, Land Available for Development The amount of land available for development per equity method investment. Other assets Equity Method Investment, Summarized Financial Information, Other Assets The amount of other assets not separately disclosed per equity method investment. Total assets Equity Method Investment, Summarized Financial Information, Assets Liabilities and Equity Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract] Debt Equity Method Investment, Summarized Financial Information, Debt All short and long term debt held by the equity method investment. Other liabilities Equity Method Investment, Summarized Financial Information, Other Liabilities The amount of liabilities other than short and long term debt. Equity Equity Method Investment Summarized Financial Information, Equity Total liabilities and equity Equity Method Investment, Summarized Financial Information, Liabilities and Equity Company's net investment in unconsolidated joint ventures Equity Method Investments Condensed Statements of Operations Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] Total revenue Equity Method Investment, Summarized Financial Information, Revenue Operating expense Equity Method Investment, Summarized Financial Information, Operating Expense Total amount of operating expense per equity method investment. Operating income (loss) Equity Method Investment, Summarized Financial Information, Operating Income (Loss) Total amount of operating income (loss) per equity method investment. Interest Equity Method Investment, Summarized Financial Information, Interest Expense Total amount of interest expense per equity method investment. Depreciation and amortization Equity Method Investment, Summarized Financial Information, Depreciation and Amortization Expense Total amount of depreciation and amortization expense per equity method investment. Other income (expense) Equity Method Investment, Summarized Financial Information, Other Nonoperating Income (Expense) Total amount of other nonoperating income (expense) per equity method investment. Gain (loss) on sale/impairment Equity Method Investment, Summarized Financial Information, Gain (Loss) on Sale of Assets and Asset Impairment Charges The total amount of gain (loss) on sale of assets and asset impairment charges per equity method investment. Net income (loss) Equity Method Investment, Summarized Financial Information, Net Income (Loss) Company's equity in earnings (loss) of unconsolidated joint ventures Difference between carrying amount and underlying equity Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Orlando [Member] Orlando [Member] Orlando reportable segment Other Joint Ventures [Member] Number of equity method investments Number of equity method investments Number of equity method investments Purchase price Payments to Acquire Real Estate Proceeds from Sale of joint venture Proceeds from Sale of Equity Method Investments Loss on sale of join venture Equity Method Investment, Realized Gain (Loss) on Disposal Notes payable Notes Payable, Related Parties Capitalized compensation, leasing costs Capitalized compensation, leasing costs Capitalized compensation costs related to the leasing of real estate. Debt Disclosure [Abstract] Indebtedness Debt Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Shares Of Beneficial Interest [Member] Common Stock [Member] Additional Paid-In Capital [Member] Additional Paid-in Capital [Member] Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] Distributions in Excess of Net Income [Member] Accumulated Distributions in Excess of Net Income [Member] Total Liberty Property Trust Shareholders' Equity [Member] Parent [Member] Noncontrolling Interest- Operating Partnership - Common Noncontrolling interest operating partnership Common [Member] Noncontrolling Interest Operating Partnership. Noncontrolling interest operating partnership Preferred [Member] Noncontrolling interest operating partnership Preferred [Member] NonControlling Interest Operating Partnership Preferred. Noncontrolling Interest-Consolidated Joint Ventures [Member] Noncontrolling interest-consolidated joint ventures [Member] Noncontrolling Interest Consolidated Joint Ventures. Partner Type [Axis] Partner Type [Axis] Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] Limited Partner [Member] Limited Partner [Member] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Common shares outstanding - Beginning Balance (shares) Common Stock, Shares, Outstanding General Partner's units outstanding - Beginning Balance (shares) General Partners' Capital Account, Units Outstanding Limited Partners' units outstanding - Beginning Balance (shares) Net proceeds from the issuance of common shares Stock Issued During Period, Value, New Issues Net proceeds from the issuance of common shares (shares) Stock Issued During Period, Shares, New Issues Net income Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Distributions Dividends, Common Stock Share-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Contributions from partners Partners' Capital Account, Contributions Contributions from partners (shares) Partners' Capital Account, Units, Sale of Units Distributions to partners Partners' Capital Account, Distributions Other comprehensive income (loss) - foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Other comprehensive (loss) income - derivative instruments Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Acquisition of noncontrolling interests Noncontrolling Interest, Increase from Acquisition Noncontrolling Interest, Increase from Acquisition Redemption of noncontrolling interests – common units Stock Issued During Period, Value, Conversion of Units Redemption of noncontrolling interests – common units (shares) Stock Issued During Period, Shares, Conversion of Units Redemption of limited partners common units for common shares Partners' Capital Account, Exchanges and Conversions Redemption of limited partners common units for common shares (shares) Partners' Capital Account, Units, Converted Share repurchase Share repurchase (shares) Common shares outstanding - Ending Balance (shares) Limited Partners' units outstanding - Ending Balance (shares) General Partner's units outstanding - Ending Balance (shares) Ending Balance Increase (Decrease) in Limited Partners' Equity Increase (Decrease) in Temporary Equity [Roll Forward] Noncontrolling interest - operating partnership (mezzanine) - Beginning of Period Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Temporary Equity, Net Income Temporary Equity, Net Income Temporary Equity, Distributions Temporary Equity, Other Changes Noncontrolling interest - operating partnership (mezzanine) - End of Period Title of Individual [Axis] Relationship to Entity [Domain] Chief Executive Officer [Member] Chief Executive Officer [Member] Executives Other [Member] Officer [Member] Chief Financial Officer [Member] Chief Financial Officer [Member] Award Type [Domain] Stock Options [Member] Employee Stock Option [Member] Restricted Stock Units (RSUs) [Member] Bonus Shares [Member] Stock Compensation Plan [Member] Performance Shares [Member] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] First Portion [Member] Share-based Compensation Award, Tranche One [Member] Second Portion [Member] Share-based Compensation Award, Tranche Two [Member] Third Portion [Member] Share-based Compensation Award, Tranche Three [Member] 2017 Grant [Member] 2017 Grant [Member] 2017 Grant [Member] Options [Member] Options [Member] Options [Member] 2008 plan [Member] 2008 plan [Member] The 2008 share compensation plan. 2016 Grant [Member] 2016 Grant [Member] 2016 Grant [Member] Bonus Shares [Member] Bonus Shares [Member] Shares issued to employees in lieu of cash bonus. Profit Sharing Plan [Member] Profit Sharing Plan [Member] The Profit Sharing Plan entitles employees of the Company, below the officer level, may receive up to a certain percentage of base pay in the form of cash contributions to an investment account depending on Company performance. Prior to 2011, these contributions were made in Company shares. ESPP [Member] Employee Share Purchase Plan [Member] The Employee Share Purchase Plan (ESPP) enables eligible employees to purchase shares of the Company at a discount to fair market value. Award Date [Axis] Award Date [Axis] Award Date [Domain] Award Date [Domain] 2015 Grant [Member] Granted in the year 2015 2014 Grant [Member] 2014 Grant [Member] Number of shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Compensation cost capitalized Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost Option term Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Vesting percent Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Share-based compensation expense Allocated Share-based Compensation Expense Shares granted Weighted average fair value of options granted (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercise price for options outstanding lower limit (USD per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Exercise price for options outstanding upper limit (USD per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Weighted average remaining contractual life of option outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Weighted average remaining contractual life of options exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Total intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Number of options outstanding and exercisable that had an exercise price higher than closing price of the Company's shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Exercise Price Higher Than Closing Price, Number Number of options for which the exercise price is higher than the Company's stock price. Number of options outstanding and exercisable that had an exercise price lower than the Company's share price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Exercise Price Lower Than Closing Price, Number Number of options for which the exercise price is lower than the Company's share price. Aggregate intrinsic value of options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Total cash received from the exercise of options Proceeds from Stock Options Exercised Unrecognized compensation costs related to nonvested options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Compensation costs not yet recognized, period for recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Long Term Incentive Shares Long Term Incentive Shares [Abstract] Long Term Incentive Shares [Abstract] Monte Carlo RSU Valuation Monte Carlo RSU Valuation The percentage applied to the RSU valuation as determined by a monte carlo simulation. Total unrecognized compensation cost related to nonvested shares Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Total fair value of restricted shares vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Bonus Shares and Plans Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] Percent of bonuses taken in cash Percentage value of cash bonus if in common shares Employees may elect to receive bonuses or commissions in the form of common shares in lieu of cash ("Bonus Shares"). By making such election, the employee receives shares equal to this percentage of the cash value of the bonus or commission, less applicable withholding tax. Salaries, Wages and Officers' Compensation Amount of bonus to apply discount Amount of bonus to apply discount Maximum percent of salary contributed Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate Profit sharing plan expense Deferred Compensation Arrangement with Individual, Compensation Expense Common shares reserved for future issuance Common Stock, Capital Shares Reserved for Future Issuance Discount on market value of shares Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date Shares issued Stock Issued During Period, Shares, Employee Stock Purchase Plans Schedule of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Increase in shares of the Trust/units of general partner from the conversion of limited partners' units Distributions per common share Common Stock, Dividends, Per Share, Declared Operating Income (Loss) [Member] Operating Income (Loss) [Member] Other Liabilities [Member] Other Liabilities [Member] Number of stories in a high-rise building Number of stories in a high-rise building Number of stories in a high-rise building Number of hotel rooms Number of hotel rooms Number of hotel rooms in a hotel Operating Income (Loss) Operating Income (Loss) Anticipated investment in joint ventures Anticipated investment in joint ventures Anticipated balance in investment in unconsolidated joint ventures after development is completed. Maximum exposure to loss Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Development in progress Development in Process Buildings and Improvements, Gross Buildings and Improvements, Gross Due to related parties Due to Related Parties Number of Residential Condominium Units Number of Residential Condominium Units Number of Residential Condominium Units Proceeds from sale of property Proceeds from Sale of Property, Plant, and Equipment Gain (loss) on sale of properties Allowance for doubtful accounts receivable Allowance for Doubtful Accounts Receivable Provision for doubtful accounts Provision for Doubtful Accounts Schedule of Taxability of Common Shares Schedule of Taxability of Common Shares [Table Text Block] Schedule of Taxability of Common Shares [Table Text Block] Schedule of Future Minimum Rental Payments Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Accounting for the Impairment or Disposal of Long-Lived Assets [Abstract] Accounting for the Impairment or Disposal of Long-Lived Assets [Abstract] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Discontinued Operations [Member] Discontinued Operations [Member] 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] Discontinued Operation Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract] Revenues Disposal Group, Including Discontinued Operation, Revenue Operating expenses Disposal Group, Including Discontinued Operation, Operating Expense Interest and other income Disposal Group, Including Discontinued Operation, Other Income Interest expense Disposal Group, Including Discontinued Operation, Interest Expense Depreciation and amortization Disposal Group, Including Discontinued Operation, Depreciation and Amortization Impairment charges - real estate assets Disposal Group, Including Discontinued Operation, Other Expense Net income before property dispositions Disposal Group, Including Discontinued Operation, Operating Income (Loss) Gain on property dispositions Net income Noncontrolling interest - operating partnership Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest Discontinued operations net of noncontrolling interest Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Capital Expenditure, Discontinued Operations Capital Expenditure, Discontinued Operations Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Commercial Paper [Member] Commercial Paper [Member] Line of Credit [Member] Line of Credit [Member] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Credit Facility Group Lenders [Member] Credit Facility Group Lenders [Member] There are a group of institutional lenders the make up the lenders for the revolving credit facility and term loan. Working Capital Facility Lender [Member] Working Capital Facility Lender [Member] There is one lender who provides us with the working capital line of credit. Extinguishment of Debt [Axis] Extinguishment of Debt [Axis] Extinguishment of Debt, Type [Domain] Extinguishment of Debt, Type [Domain] Unsecured Debt [Member] Unsecured Debt [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Notes [Member] Senior Notes [Member] Mortgages [Member] Mortgages [Member] Medium-term Notes [Member] Medium-term Notes [Member] Debt Instrument [Axis] Debt Instrument, Name [Domain] 3.25% Senior Notes [Member] 3.25% Senior Notes [Member] 3.25% 10 year senior notes issued in September 2016. 5.5% Senior Note [Member] 5.5% Senior Note [Member] 5.5% Senior Note due in December 2016. 6.625% Senior Note [Member] 6.625% Senior Note [Member] 6.625% Senior Note [Member] 7.5% Medium Term Note [Member] 7.5% Medium Term Note [Member] 7.5% Medium Term Note [Member] 2014 Credit Facility [Member] 2014 Credit Facility [Member] 2014 Credit Facility [Member] 2017 Credit Facility [Member] 2017 Credit Facility [Member] 2017 Credit Facility [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Repurchased face amount of debt Debt Instrument, Repurchased Face Amount Debt instrument, face amount Debt Instrument, Face Amount Loss on debt extinguishment Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Accounting for the Impairment or Disposal of Long-Lived Assets Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units Noncontrolling Interest Disclosure [Text Block] Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Real estate: Real Estate Investment Property, Net [Abstract] Land and land improvements Land and Land Improvements Building and improvements Investment Building and Building Improvements Less accumulated depreciation Real Estate Investment Property, Accumulated Depreciation Operating real estate Real Estate Investments, Other Land held for development Land Available for Development Net real estate Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents Accounts receivable, net Accounts Receivable, Net Deferred rent receivable, net Deferred Rent Receivables, Net Deferred financing and leasing costs, net Deferred Costs, Leasing, Net Investments in and advances to unconsolidated joint ventures Assets held for sale Disposal Group, Including Discontinued Operation, Assets Prepaid expenses and other assets Prepaid Expense and Other Assets Total assets LIABILITIES Liabilities [Abstract] Mortgage loans, net Secured Debt Unsecured notes, net Unsecured Debt Credit facilities Long-term Line of Credit Accounts payable Accounts Payable Accrued interest Interest Payable Dividend and distributions payable Dividends Payable Other liabilities Other Liabilities Liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities Total liabilities Liabilities Noncontrolling interest - operating partnership - 301,483 preferred units outstanding as of December 31, 2017 and December 31, 2016 EQUITY Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Common shares of beneficial interest, $.001 par value, 283,987,000 shares authorized; 147,450,691 and 146,993,018 shares issued and outstanding as of December 31, 2017 and December 31, 2016, respectively Common Stock, Value, Issued General partner’s equity - 147,450,691 and 146,993,018 common units outstanding as of December 31, 2017 and December 31, 2016, respectively General Partners' Capital Account Limited partners’ equity – 3,520,205 and 3,530,031 common units outstanding as of December 31, 2017 and December 31, 2016, respectively Limited Partners' Capital Account Additional paid-in capital Additional Paid in Capital Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Distributions in excess of net income Accumulated Distributions in Excess of Net Income Total Liberty Property Trust shareholders’ equity Stockholders' Equity Attributable to Parent Noncontrolling interest – operating partnership Noncontrolling Interest [Abstract] 3,520,205 and 3,530,031 common units outstanding as of December 31, 2017 and December 31, 2016, respectively Noncontrolling Interest in Operating Partnerships Noncontrolling interest – consolidated joint ventures Noncontrolling Interest in Joint Ventures Total equity Total liabilities, noncontrolling interest - operating partnership and equity Liabilities and Equity Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] 2018 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Deferred financing and leasing costs, net Finite-Lived Intangible Assets, Net Real Estate and Accumulated Depreciation, by Property [Table] SEC Schedule III, Real Estate and Accumulated Depreciation, by Property [Table] Operating Properties [Member] Operating Properties [Member] Operating Properties [Member] Development in Progress [Member] Development in Progress [Member] Development in Progress [Member] Land Held for Development [Member] Land Held for Development [Member] Land Held for Development [Member] Real Estate and Accumulated 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[Member] 5410 - 5430 Northwest 33rd Avenue [Member] 5410 - 5430 Northwest 33rd Avenue [Member] 5410 - 5430 Northwest 33rd Avenue [Member] 12601 Industry Street [Member] 12601 Industry Street [Member] 12601 Industry Street [Member] 12641 Industry Street [Member] 12641 Industry Street [Member] 12641 Industry Street [Member] 12681-12691 Pala Drive [Member] 12681-12691 Pala Drive [Member] 12681-12691 Pala Drive [Member] 850 S Jupiter Road [Member] 850 S Jupiter Road [Member] 850 S Jupiter Road [Member] 2510 W Main Street [Member] 2510 W Main Street [Member] 2510 W Main Street [Member] 4251 North Highway 121 [Member] 4251 North Highway 121 [Member] 4251 North Highway 121 [Member] 1150 Pleasant Ridge Road [Member] 1150 Pleasant Ridge Road [Member] 1150 Pleasant Ridge Road [Member] 25 Brookfield Oaks Drive [Member] 25 Brookfield Oaks Drive [Member] 25 Brookfield Oaks Drive [Member] 45 Brookfield Oaks Drive [Member] 45 Brookfield Oaks Drive [Member] 45 Brookfield Oaks Drive [Member] 2011 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Long-term Debt, Maturities, Repayments of Principal in Year Five 2022 Long-term Debt, Maturities, Repayments of Principal in Year Six Long-term Debt, Maturities, Repayments of Principal in Year Six 2023 Long-term Debt, Maturities, Repayments of Principal in Year Seven Long-term Debt, Maturities, Repayments of Principal in Year Seven 2024 Long-term Debt, Maturities, Repayments of Principal in Year Eight Long-term Debt, Maturities, Repayments of Principal in Year Eight 2025 Long-term Debt, Maturities, Repayments of Principal in Year Nine Long-term Debt, Maturities, Repayments of Principal in Year Nine 2027 and thereafter Long-term Debt, Maturities, Repayments of Principal After Year Nine Long-term Debt, Maturities, Repayments of Principal After Year Nine Subtotal Reconciling items Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Total for consolidated balance sheet Long-term Debt, Maturities Total The total amount of scheduled principal amortization and maturies of a company's long-term debt including mortgage loans, unsecured notes and line of credit. Weighted average interest rate Long-term Debt, Weighted Average Interest Rate, at Point in Time Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding January 1, 2016 (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Exercised (in shares) Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Outstanding December 31, 2016 (in shares) Exercisable at December 31, 2016 (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding January 1, 2016 (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Exercised (USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited (USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Outstanding December 31, 2016 (USD per share) Exercisable at December 31, 2016 (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Income per Common Share of the Trust Earnings Per Share [Text Block] Long-term Debt, Other Disclosures [Abstract] Fixed Rate Debt [Member] Fixed Rate Debt [Member] Mortgage Loans and Unsecured Notes [Member] Mortgage Loans and Unsecured Notes [Member] Mortgage Loans and Unsecured Notes [Member] Maturity date range, start Debt Instrument, Maturity Date Range, Start Maturity date range, end Debt Instrument, Maturity Date Range, End Net book value of collateralized real estate properties Net Book Value of Collateralized Real Estate Properties Net Book Value of Collateralized Real Estate Properties Percentage bearing fixed interest, amount Long-term Debt, Percentage Bearing Fixed Interest, Amount Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Weighted average remaining life Debt Instrument, Weighted Average Remaining Term Debt Instrument, Weighted Average Remaining Term Property, Plant and Equipment Assets Held-for-sale Disclosure [Abstract] Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] Discontinued Operations, Held-for-sale [Member] Discontinued Operations, Held-for-sale [Member] Discontinued Operations, Disposed of by Sale [Member] Discontinued Operations, Disposed of by Sale [Member] Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] Disposal Group, Held-for-sale, Not Discontinued Operations [Member] Disposal Group, Held-for-sale, Not Discontinued Operations [Member] Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Held for Sale, Includes Disposal Groups and Discontinued Operations [Member] Held for Sale, Includes Disposal Groups and Discontinued Operations [Member] Includes all assets held for sale as of the end of the period. This includes both discontinued operations and not discontinued operations. Disposed of by Sale, Discontinued Operations and Not Discontinued Operations [Member] Disposed of by Sale, Discontinued Operations and Not Discontinued Operations [Member] Assets disposed of during the year including discontinued and not discontinued operations. Area of land Area of Real Estate Property Area of Real Estate Property Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract] Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract] Disposal Group, Including Discontinued Operations, Land and Land Improvements Disposal Group, Including Discontinued Operations, Land and Land Improvements Disposal Group, Including Discontinued Operations, Land and Land Improvements Disposal Group, Including Discontinued Operations, Building and Improvements Disposal Group, Including Discontinued Operations, Building and Improvements Disposal Group, Including Discontinued Operations, Building and Improvements Disposal Group, Including Discontinued Operation, Land Available for Development Disposal Group, Including Discontinued Operation, Land Available for Development Land available for development that is included in a disposal group or assets held for sale. Disposal Group, Including Discontinued Operations, Accumulated Depreciation Disposal Group, Including Discontinued Operations, Accumulated Depreciation Disposal Group, Including Discontinued Operations, Accumulated Depreciation Disposal Group, Including Discontinued Operation, Intangible Assets Disposal Group, Including Discontinued Operation, Intangible Assets Disposal Group, Including Discontinued Operation, Other Assets Disposal Group, Including Discontinued Operation, Other Assets Disposal Group, Including Discontinued Operation, Assets Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Combination, Separately Recognized Transactions [Axis] Business Combination, Separately Recognized Transactions [Axis] Business Combination, Separately Recognized Transactions [Domain] Business Combination, Separately Recognized Transactions [Domain] 2015 acquisitions [Member] 2015 acquisitions [Member] 2015 acquisitions [Member] 2016 acquisitions [Member] 2016 acquisitions [Member] Property acquisitions during the year ended December 31, 2016. 2016 acquisitions [Member] 2017 acquisitions [Member] Real estate properties acquired during the 2017 fiscal year. 2015 acquisitions [Member] 2018 acquisitions [Member] Real properties purchased in the calendar year 2018. Land, Buildings and Improvements [Member] Land, Buildings and Improvements [Member] Chicago Minneapolis [Member] Southern California [Member] Operating segment of the company for the properties located in Southern California. Business Acquisition [Line Items] Business Acquisition [Line Items] Number of buildings Supply Commitment [Table] Supply Commitment [Table] Equity Method Investments [Member] Equity Method Investments [Member] Supply Commitment [Axis] Supply Commitment [Axis] Supply Commitment Arrangement [Domain] Supply Commitment Arrangement [Domain] Building and land parcels [Member] Tenant Improvements [Member] Leasehold Improvements [Member] Category of Item Purchased [Axis] Category of Item Purchased [Axis] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-term Purchase Commitment, Category of Item Purchased [Domain] Land Purchases [Member] Capital Addition Purchase Commitments [Member] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] American Water Works, Inc [Member] American Water Works, Inc [Member] American Water Works, Inc [Member] Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Development commitment [Member] Development commitment [Member] Commitment to develop a building that has not yet begun construction. Supply Commitment [Line Items] Supply Commitment [Line Items] Letter of credit obligations Letters of Credit Outstanding, Amount Deferred leasing costs Deferred Costs, Leasing, Gross Remaining amount committed or obligated to pay for the benefit of current or future tenants Supply Commitment, Remaining Minimum Amount Committed Maximum tenant improvements not yet completed Supply Commitment, Remaining Maximum Amount Committed Supply Commitment, Remaining Maximum Amount Committed Remaining amount committed to future land purchases Purchase Commitment, Remaining Minimum Amount Committed 2018 land purchase commitment Purchase Obligation, Due in Next Twelve Months 2019 land purchase commitment Purchase Obligation, Due in Second Year Tenant improvements Contractual Obligation Development commitment Other Commitment Costs incurred Cost of Real Estate Sales Earnings Per Share, Basic and Diluted [Line Items] Income from continuing operations net of noncontrolling interest - diluted (shares) Employee Benefit Plans [Abstract] Employee Benefit Plans [Abstract] Employee Benefit Plans Compensation and Employee Benefit Plans [Text Block] Future Minimum Rental Payments Lessee, Operating Lease, Disclosure [Table Text Block] Number of common units converted Distributions per common unit Derivative Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Schedule of Quarterly Financial Information Quarterly Financial Information [Table Text Block] Property, Plant and Equipment [Abstract] 2016 sales [Member] 2016 sales [Member] All real estate sales sold during the year ended December 31, 2016 2016 sales [Member] 2015 sales [Member] All real estate sold during the year ended December 31, 2015 2017 sales [Member] 2017 sales [Member] All real estate assets sold during the year ended December 31, 2017. Richmond Hampton Roads Sale [Member] Richmond Hampton Roads Sale [Member] Related party property sale in the Richmond Hampton Roads reportable segment. Immediate Family Member of Management or Principal Owner [Member] Immediate Family Member of Management or Principal Owner [Member] Disposition Disclosures [Line Items] Gain on sale of property Deferred Gain on Sale of Property Gain (Loss) on Disposition of Property Plant Equipment Gain (Loss) on Disposition of Property Plant Equipment Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Secured Debt [Member] Secured Debt [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Long-term Debt [Member] Long-term Debt [Member] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Unsecured notes, net Fair Value Financial and Nonfinancial Liabilities, Fair Value Disclosure Real Estate Companies Disclosures [Abstract] Real Estate Companies Disclosures [Abstract] Real Estate Investments, Net [Abstract] Real Estate Investments, Net [Abstract] Schedule of Real Estate Properties [Table] Schedule of Real Estate Properties [Table] Real Estate Properties [Line Items] Real Estate Properties [Line Items] Real Estate Investment Property, Net [Abstract] Real Estate Investment Property, at Cost [Abstract] Real Estate Investment Property, at Cost [Abstract] Land and Land Improvements Building and improvements Accumulated Depreciation Total Real Estate Real Estate Investment Property, at Cost Depreciation Depreciation Schedule of Carrying Value of Properties Real Estate Investment Property, Net [Table Text Block] [Table Text Block] for Disclosure for Real Estate Companies of real estate investment property information including cost, accumulated depreciation and net total by property type. Disposal Group, Including Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Schedule of Operating Properties and Land Parcels Acquired Schedule of Business Acquisitions, by Acquisition [Table Text Block] Supplemental Disclosure to Statements of Cash Flows [Abstract] Supplemental Cash Flow Elements [Abstract] Other Significant Noncash Transactions [Table] Other Significant Noncash Transactions [Table] Operating Activities [Axis] Disposal Group Classification [Domain] Operating Activities [Domain] Continuing Operations [Member] Continuing Operations [Member] Other Significant Noncash Transactions [Line Items] Other Significant Noncash Transactions [Line Items] Write-off of fully depreciated/amortized property and deferred costs - properties included in continuing operations Write off of fully depreciated property and deferred costs Write off of fully depreciated property and deferred costs Write-off of depreciated property and deferred costs due to sale/demolition - properties included in continuing operations Write Off Of Depreciated Property And Deferred Costs Due To Sale Write Off Of Depreciated Property And Deferred Costs Due To Sale Write-off of costs related to early debt extinguishment Write off of Deferred Debt Issuance Cost Increase in investments in and advances to unconsolidated joint ventures due to disposition/development activity Other Significant Noncash Transaction, Value of Consideration Given Changes in accrued development capital expenditures - properties included in continuing operations Change in accrued development capital expenditures The change in accrued expenses from prior period for development capital expenditures. Unrealized gain (loss) on cash flow hedge Unrealized gain (loss) on cash flow hedge, non cash transaction Unrealized gain (loss) on cash flow hedge, non cash transaction Capitalized equity-based compensation Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount Redemption of noncontrolling interests - common units Conversion of Stock, Amount Converted Schedule of Preferred Units Schedule of Preferred Units [Table Text Block] Supplemental Disclosure to Statements of Cash Flows Cash Flow, Supplemental Disclosures [Text Block] Intersegment Eliminations [Member] Intersegment Eliminations [Member] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Interest expense Interest Expense Loss on debt extinguishment Depreciation, Depletion and Amortization, Nonproduction Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization expense Depreciation, Depletion and Amortization Impairment - real estate assets (2) Impairment of Real Estate Gain on property dispositions Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Gain on property dispositions Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Equity in earnings of unconsolidated joint ventures General and administrative expense General and Administrative Expense Expensed pursuit costs Discontinued operations excluding gain on property dispositions Discontinued Operations excluding Gain on Sale Discontinued Operations excluding Gain on Sale Income taxes Income Tax Expense (Benefit) Other Other Nonrecurring (Income) Expense Income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Discontinued operations Weighted average interest rate Debt, Weighted Average Interest Rate Interest costs capitalized Interest Costs Capitalized Cash paid for interest Interest Paid Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] AOCI Including Portion Attributable to Noncontrolling Interest [Member] AOCI Including Portion Attributable to Noncontrolling Interest [Member] AOCI Attributable to Noncontrolling Interest [Member] AOCI Attributable to Noncontrolling Interest [Member] AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] AOCI Including Portion Attributable to Noncontrolling Interest [Abstract] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Other comprehensive income (loss), before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Reclassification adjustment Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Total equity Total accumulated other comprehensive loss included in shareholders' equity impairment - real estate assets [Member] impairment - real estate assets [Member] Impairment - real estate assets line item on the consolidated statements of comprehensive income Asset impairment charges Asset Impairment Charges Limited Partners' Equity in the Operating Partnership [Abstract] Limited Partners' Equity in the Operating Partnership [Abstract] Schedule of Limited Partners' Capital Account by Class [Table] Owners' Equity - Operating Partnership Partners' Capital Notes Disclosure [Text Block] Schedule of Debt Schedule of Debt [Table Text Block] Organization Organization Policy Text Block Organization Policy. Use of Estimates Use of Estimates, Policy [Policy Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Real Estate and Depreciation Property, Plant and Equipment, Policy [Policy Text Block] Investments in Unconsolidated Joint Ventures Equity Method Investments [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Accounts Receivable/Deferred Rent Receivable Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Deferred Financing and Leasing Costs Deferred Charges, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Share-based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Selling, General and Administrative Expenses, Policy [Policy Text Block] Selling, General and Administrative Expenses, Policy [Policy Text Block] Derivative Financial Instruments Derivatives, Policy [Policy Text Block] Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Sales of Real Estate Real Estate Held for Development and Sale, Policy [Policy Text Block] Earnings Per Share/Unit Earnings Per Share, Policy [Policy Text Block] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Interest Expense Allocated to Discontinued Operations Interest Expense Allocated to Discontinued Operations, Policy [Policy Text Block] Accounting for the Impairment or Disposal of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] Letter of Credit [Member] Letter of Credit [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Commitment fee percentage Line of Credit Facility, Commitment Fee Percentage Expiration date Line of Credit Facility, Expiration Date Number of maturity extensions Number of maturity extensions The number of maturity extensions on long-term debt available to the entity. Length of maturity extension Length of Maturity Extension The length of a debt maturity extension in months or years. Competitive bid percentage Line of Credit Facility, Competitive Bid Option, Percentage Competitive Bid Option % of Facility Amount Amount outstanding Borrowed funds for covenant ratio Debt and Capital Lease Obligations Covenant ratio Line of Credit Facility, Covenant Terms, Earnings before Interest, Taxes, Depreciation and Amortization to Fixed Charges Ratio Earnings Before Interest, Taxes, Depreciation and Amortization Debt covenant percentage Line of Credit Facility, Unsecured Debt to Unencumbered Asset Value, Maximum Unsecured Debt to Unencumbered Asset Value Line of Credit Facility, Secured Debt to Total Asset Value, Maximum Line of Credit Facility, Secured Debt to Total Asset Value, Maximum Line of Credit Facility, Secured Debt to Total Asset Value, Maximum Unencumbered net operating income to unsecured interest expense value for debt covenant Line of Credit Facility, Unencumbered Net Operating Income to Unsecured Interest Expense, Minimum Line of Credit Facility, Unencumbered Net Operating Income to Unsecured Interest Expense, Minimum Debt Covenant Defined Contribution Plan [Table] Defined Contribution Plan [Table] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Pension Plan [Member] Pension Plan [Member] Retirement Plan Name [Axis] Retirement Plan Name [Axis] Retirement Plan Name [Domain] Retirement Plan Name [Domain] 401(k) [Member] 401(k) [Member] 401(k) [Member] Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Company match for defined contribution plan percentage Defined Contribution Plan, Employer Matching Contribution, Percent of Match Cost recognized Defined Contribution Plan, Cost Deferred Financing and Leasing Costs Intangible Assets Disclosure [Text Block] 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years 2023 though 2067 Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Other Expenses Other Expenses [Abstract] Operating ground lease expense Operating Ground Lease Expense Operating Ground Lease Expense Real Estate [Table] Real Estate [Table] Real Estate Portfolio [Member] Real Estate Portfolio [Member] Real Estate Portfolio [Member] Real Estate [Line Items] Real Estate [Line Items] Proceeds from sale of land Proceeds from Sale of Land Held-for-investment Noncontrolling interest – operating partnership Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable Income available to common shareholders Finite-Lived Intangible Assets, Net [Abstract] Finite-Lived Intangible Assets, Net [Abstract] Finite-lived intangible assets Finite-Lived Intangible Assets, Gross [Abstract] Deferred financing costs Debt Issuance Costs, Line of Credit Arrangements, Gross Market value intangible Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross Origination value intangible Finite-Lived Intangible Asset, Acquired-in-Place Leases Finite-lived intangible assets, gross Finite-Lived Intangible Assets, Gross Accumulated amortization: Finite-Lived Intangible Assets, Accumulated Amortization [Abstract] Finite-Lived Intangible Assets, Accumulated Amortization [Abstract] Deferred financing costs Accumulated Amortization of Debt Issuance Costs, Line of Credit Arrangements Deferred leasing costs Deferred Costs, Leasing, Accumulated Amortization Market value intangible Accumulated Amortization, Finite-lived intangible, Off-market lease, Favorable Accumulated Amortization of the identifiable intangible asset established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date. Origination value intangible Accumulated Amortization, Finite-Lived Intangible Asset, Acquired-in-Place Leases Accumulated Amortization of the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired. Finite-lived intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Amortization of intangible assets Amortization of Intangible Assets Depreciation and amortization of tenant improvement and lease transaction costs Depreciation and amortization of tenant improvement and lease transaction costs Depreciation and amortization of leasing transaction costs associated with executing a lease agreement. Typically includes depreciation and amortization expense relating to tenant improvements, leasing commissions, legal fees, etc.. Significant Sale Real Estate Properties Sold [Table Text Block] This schedule details the real estate properties sold. This schedule includes the number of properties sold, amount of square feet sold and the amount of proceeds received by segment. Asset Impairment Charges Asset Impairment Charges [Table Text Block] The table disclosure for the details of the charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. Disclosure may also include a description of the impaired asset and facts and circumstances leading to the impairment, amount of the impairment loss and where the loss is located in the income statement, method(s) for determining fair value, and the segment in which the impaired asset is reported. OPERATING REVENUE Revenues [Abstract] Rental Operating Leases, Income Statement, Lease Revenue Operating expense reimbursement Tenant Reimbursements Total operating revenue OPERATING EXPENSE Operating Expenses [Abstract] Rental property Direct Costs of Leased and Rented Property or Equipment Real estate taxes Real Estate Tax Expense General and administrative Depreciation and amortization Impairment - real estate assets Total operating expense Costs and Expenses Operating income OTHER INCOME (EXPENSE) Nonoperating Income (Expense) [Abstract] Interest and other income Other Income Total other income (expense) Nonoperating Income (Expense) Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income from continuing operations Discontinued operations (including net gain on property dispositions of $14,578 for the year ended December 31, 2017) Net income Noncontrolling interest – consolidated joint ventures Noncontrolling Interest in Net Income (Loss) Joint Venture Partners, Nonredeemable Preferred unit distributions Comprehensive income attributable to common shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Other comprehensive income (loss) - derivative instruments Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: comprehensive income attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to common shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Earnings per common share Basic: Income from continuing operations (USD per share/unit) Income from discontinued operations (USD per share/unit) Income per common share - basic (USD per share/unit) Diluted: Income from continuing operations (USD per share/unit) Income from discontinued operations (USD per share/unit) Income per common share - diluted (USD per share/unit) Weighted average number of common shares outstanding Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Basic (shares) Diluted (shares) Net Income Allocated to General Partners Net Income (Loss) Allocated to General Partners Net Income Allocated to Limited Partners Net Income (Loss) Allocated to Limited Partners Amounts attributable to common shareholders Income Amounts Attributable to Parent, Disclosures [Abstract] Income from continuing operations Discontinued operations Income available to common shareholders Income per Common Unit of the Operating Partnership Supplemental Disclosure to Statements of Cash Flows Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Liberty Washington, LP [Member] Joint venture, 2016 transfer to lender [Member] Joint venture, 2016 transfer to lender [Member] Joint venture, 2016 transfer of properties to lender through a deed in lieu or foreclosure. Northern Virginia and Washington DC [Member] Northern Virginia and Washington DC [Member] Northern Virginia and Washington DC reportable segments DC Metro [Member] DC Metro [Member] DC Metro reportable segment. Northern Virginia [Member] Northern Virginia [Member] Northern Virginia business segment [Member] Discontinued Operations, Disposed of by Means Other than Sale [Member] Discontinued Operations, Disposed of by Means Other than Sale [Member] Extinguishment of debt Extinguishment of Debt, Amount Gain (loss) on debt extinguishment 2015 Grant [Member] 2014 Grant [Member] Restricted Stock Units (RSUs) [Member] Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Historical volatility factor Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Weighted-average expected life Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Redeemable Preferred Stock [Member] Redeemable Preferred Stock [Member] Redeemable stock, preferred units outstanding Par value (USD per share) Common Stock, Par or Stated Value Per Share Common shares authorized Common Stock, Shares Authorized Common shares issued Common Stock, Shares, Issued Common shares outstanding