Income per Common Unit of the Operations Partnership, Dilutive Options (Details) (Liberty Property Limited Partnership [Member], Stock Option [Member], Common Units [Member])	3 Months Ended	12 Months Ended
Mar. 31, 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	44,000	44,000

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Period Type:	duration