Limited Partners' Equity of the Operating Partnership	6 Months Ended
Limited Partners' Equity of the Operating Partnership	Jun. 30, 2013
Preferred Units [Line Items]
Noncontrolling Interest Disclosure [Text Block]	Noncontrolling Interests of the Trust Noncontrolling interests in the accompanying financial statements represent the interests of the common and preferred units in the Operating Partnership not held by the Trust. In addition, noncontrolling interests include third-party ownership interests in consolidated joint venture investments. Common units The common units outstanding of the Operating Partnership not held by the Trust as of June 30, 2013 have the same economic characteristics as common shares of the Trust. The 3,713,851 outstanding common units of the Operating Partnership at such date not held by the Trust share proportionately in the net income or loss and in any distributions of the Operating Partnership. The common units of the Operating Partnership not held by the Trust are redeemable at any time at the option of the holder. The Trust, as the sole general partner of the Operating Partnership, may at its option elect to settle the redemption in cash or through the exchange on a one-for-one basis with unregistered common shares of the Trust. The market value of the 3,713,851 outstanding common units based on the closing price of the common shares of the Trust at June 30, 2013 was $137.3 million. Preferred units The Trust had no outstanding cumulative redeemable preferred units of the Operating Partnership (the “Equity Preferred Units”) as of June 30, 2013. During the three months ended June 30, 2013, the Company redeemed $20.0 million of outstanding 7.00% Series E Cumulative Redeemable Preferred Units, $17.5 million of outstanding 6.65% Series F Cumulative Redeemable Preferred Units and $27.0 million of outstanding 6.70% Series G Cumulative Redeemable Preferred Units, all at par. In connection with these redemptions, the Company wrote off $1.2 million in origination costs. These amounts are included in noncontrolling interest - operating partnership in the Trust's consolidated statements of comprehensive income.
Liberty Property Limited Partnership [Member]
Preferred Units [Line Items]
Noncontrolling Interest Disclosure [Text Block]	Limited Partners' Equity and Noncontrolling Interest of the Operating Partnership Limited partners' equity in the accompanying financial statements represents the interests of the common and preferred units in the Operating Partnership not held by the Trust. The Operating Partnership's noncontrolling interest includes third-party ownership interests in consolidated joint venture investments. Common units Common units relates to limited partnership interests of the Operating Partnership issued in connection with the formation of the Operating Partnership and certain subsequent acquisitions. The common units outstanding as of June 30, 2013 have the same economic characteristics as common shares of the Trust. The 3,713,851 outstanding common units at such date are the limited partners' equity - common units held by persons and entities other than the Trust, the general partner of the Operating Partnership, which holds a number of common units equal to the number of outstanding common shares of beneficial interest. Both the common units held by the Trust and the common units held by persons and entities other than the Trust are counted in the weighted average number of common units outstanding during any given period. The common units share proportionately in the net income or loss and in any distributions of the Operating Partnership and are exchangeable into the same number of common shares of the Trust. The market value of the 3,713,851 outstanding common units at June 30, 2013 based on the closing price of the common shares of the Company at June 30, 2013 was $137.3 million. Preferred units The Operating Partnership had no outstanding cumulative redeemable preferred units as of June 30, 2013. During the three months ended June 30, 2013, the Company redeemed $20.0 million of outstanding 7.00% Series E Cumulative Redeemable Preferred Units, $17.5 million of outstanding 6.65% Series F Cumulative Redeemable Preferred Units and $27.0 million of outstanding 6.70% Series G Cumulative Redeemable Preferred Units, all at par. In connection with these redemptions, the Company wrote off $1.2 million in origination costs.

The entire disclosure for noncontrolling interest in consolidated subsidiaries, which could include the name of the subsidiary, the ownership percentage held by the parent, the ownership percentage held by the noncontrolling owners, the amount of the noncontrolling interest, the location of this amount on the balance sheet (when not reported separately), an explanation of the increase or decrease in the amount of the noncontrolling interest, the noncontrolling interest share of the net Income or Loss of the subsidiary, the location of this amount on the income statement (when not reported separately), the nature of the noncontrolling interest such as background information and terms, the amount of the noncontrolling interest represented by preferred stock, a description of the preferred stock, and the dividend requirements of the preferred stock.

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