Income per Common Unit of the Operations Partnership, Dilutive Options (Details) - shares	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Liberty Property Limited Partnership [Member] \| Stock Option [Member] \| Common Units [Member]
Stock Option Exercises [Line Items]
Amount of Options Exercises in Period	8,000	53,000	44,000

Number of share options (or share units) exercised during the current period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration