Organization and Basis of Presentation	9 Months Ended
Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	Organization and Basis of Presentation Organization Liberty Property Trust (the “Trust”) is a self-administered and self-managed Maryland real estate investment trust (a “REIT”). Substantially all of the Trust’s assets are owned directly or indirectly, and substantially all of the Trust’s operations are conducted directly or indirectly, by its subsidiary, Liberty Property Limited Partnership, a Pennsylvania limited partnership (the “Operating Partnership” and, together with the Trust and their consolidated subsidiaries, the “Company”). The Trust is the sole general partner and also a limited partner of the Operating Partnership, owning 97.7% of the common equity of the Operating Partnership at September 30, 2015. The Company owns and operates industrial properties nationally and owns and operates office properties in a focused group of office markets. Additionally, the Company owns certain assets in the United Kingdom. Unless otherwise indicated, the notes to the Consolidated Financial Statements apply to both the Trust and the Operating Partnership. The terms the “Company,” “we,” “our” and “us” mean the Trust and Operating Partnership collectively. Basis of Presentation The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with United States generally accepted accounting principles (“US GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by US GAAP for complete financial statements and should be read in conjunction with the consolidated financial statements and notes thereto included in the Annual Report on Form 10-K of the Company for the year ended December 31, 2014. In the opinion of management, all adjustments (consisting solely of normal recurring adjustments) necessary for a fair presentation of the financial statements for these interim periods have been included. The results of interim periods are not necessarily indicative of the results to be obtained for a full fiscal year. As disclosed in Note 2, Income per Common Share of the Trust - Share Repurchase, the Company repurchased common shares pursuant to a share repurchase program authorized by the Company's Board of Trustees. These repurchased shares along with those repurchased in prior periods are subject to state corporate laws that establish the legal status of redeemed shares and prevent them from being reported as treasury shares within the consolidated financial statements. The Trust previously misclassified the repurchased shares as common shares in treasury. The share repurchases should have been classified as reductions of common shares of beneficial interest and additional paid-in capital. The accompanying consolidated balance sheet of the Trust as of December 31, 2014 has been restated to correct the misclassification. The correction results in reductions in common shares of beneficial interest and additional paid-in capital at December 31, 2014 of $1,000 and $51.9 million, respectively, from the previously reported amounts of $150,000 and $3,740.6 million, respectively. The reclassification has no impact on the previously reported consolidated statements of comprehensive income, nor does it have any effect on the previously reported consolidated statements of cash flows. In addition, the reclassification has no impact on the previously reported consolidated financial statements of the Operating Partnership. Recently Issued Accounting Standards In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), which supersedes nearly all existing revenue recognition guidance. The standard clarifies the required factors that an entity must consider when recognizing revenue. The standard also requires additional disclosures concerning contracts with customers, judgments concerning revenue recognition, and assets recognized for the costs to obtain or fulfill a contract. ASU 2014-09 is effective for the Company beginning January 1, 2018. The Company is evaluating the impact ASU 2014-09 will have on its financial position and results of operations. In April 2015, the FASB issued ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs ("ASU 2015-03"). The standard requires the costs for issuing debt to appear on a balance sheet as a direct deduction from the debt's value. ASU 2015-03 is effective for the Company beginning January 1, 2016. The standard would be applied retrospectively. The Company does not anticipate that the adoption of ASU 2015-03 will have a material impact on its financial position or results of operations. In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis (Topic 810) ("ASU 2015-02"). The standard requires that all entities re-evaluate and revise consolidation documentation for limited partnerships and similar legal entities. It makes changes to both the variable interest model and voting model. ASU 2015-02 is effective for the Company beginning January 1, 2016. The standard allows for either a full retrospective or a modified retrospective approach to adoption. The Company is evaluating the impact ASU 2015-02 will have on its financial position and results of operations.

Organization and Basis of Presentation

Organization

Liberty Property Trust (the “Trust”) is a self-administered and self-managed Maryland real estate investment trust (a “REIT”). Substantially all of the Trust’s assets are owned directly or indirectly, and substantially all of the Trust’s operations are conducted directly or indirectly, by its subsidiary, Liberty Property Limited Partnership, a Pennsylvania limited partnership (the “Operating Partnership” and, together with the Trust and their consolidated subsidiaries, the “Company”). The Trust is the sole general partner and also a limited partner of the Operating Partnership, owning 97.7% of the common equity of the Operating Partnership at September 30, 2015. The Company owns and operates industrial properties nationally and owns and operates office properties in a focused group of office markets. Additionally, the Company owns certain assets in the United Kingdom. Unless otherwise indicated, the notes to the Consolidated Financial Statements apply to both the Trust and the Operating Partnership. The terms the “Company,” “we,” “our” and “us” mean the Trust and Operating Partnership collectively.

Basis of Presentation

The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with United States generally accepted accounting principles (“US GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by US GAAP for complete financial statements and should be read in conjunction with the consolidated financial statements and notes thereto included in the Annual Report on Form 10-K of the Company for the year ended December 31, 2014. In the opinion of management, all adjustments (consisting solely of normal recurring adjustments) necessary for a fair presentation of the financial statements for these interim periods have been included. The results of interim periods are not necessarily indicative of the results to be obtained for a full fiscal year.

As disclosed in Note 2, Income per Common Share of the Trust - Share Repurchase, the Company repurchased common shares pursuant to a share repurchase program authorized by the Company's Board of Trustees. These repurchased shares along with those repurchased in prior periods are subject to state corporate laws that establish the legal status of redeemed shares and prevent them from being reported as treasury shares within the consolidated financial statements. The Trust previously misclassified the repurchased shares as common shares in treasury. The share repurchases should have been classified as reductions of common shares of beneficial interest and additional paid-in capital. The accompanying consolidated balance sheet of the Trust as of December 31, 2014 has been restated to correct the misclassification. The correction results in reductions in common shares of beneficial interest and additional paid-in capital at December 31, 2014 of $1,000 and $51.9 million, respectively, from the previously reported amounts of $150,000 and $3,740.6 million, respectively. The reclassification has no impact on the previously reported consolidated statements of comprehensive income, nor does it have any effect on the previously reported consolidated statements of cash flows. In addition, the reclassification has no impact on the previously reported consolidated financial statements of the Operating Partnership.

Recently Issued Accounting Standards

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), which supersedes nearly all existing revenue recognition guidance. The standard clarifies the required factors that an entity must consider when recognizing revenue. The standard also requires additional disclosures concerning contracts with customers, judgments concerning revenue recognition, and assets recognized for the costs to obtain or fulfill a contract. ASU 2014-09 is effective for the Company beginning January 1, 2018. The Company is evaluating the impact ASU 2014-09 will have on its financial position and results of operations.

In April 2015, the FASB issued ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs ("ASU 2015-03"). The standard requires the costs for issuing debt to appear on a balance sheet as a direct deduction from the debt's value. ASU 2015-03 is effective for the Company beginning January 1, 2016. The standard would be applied retrospectively. The Company does not anticipate that the adoption of ASU 2015-03 will have a material impact on its financial position or results of operations.

In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis (Topic 810) ("ASU 2015-02"). The standard requires that all entities re-evaluate and revise consolidation documentation for limited partnerships and similar legal entities. It makes changes to both the variable interest model and voting model. ASU 2015-02 is effective for the Company beginning January 1, 2016. The standard allows for either a full retrospective or a modified retrospective approach to adoption. The Company is evaluating the impact ASU 2015-02 will have on its financial position and results of operations.