Income Statement Parenthetical (Parentheticals) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Gain on property dispositions	$ 46,117	$ 41,713
Liberty Property Limited Partnership [Member]
Gain on property dispositions	$ 46,117	$ 41,713

Net gain on property dispositions included in discontinued operation.

No definition available.

Name:	lry_NetGainOnPropertyDispositionsIncludedInDiscontinuedOperation
Namespace Prefix:	lry_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration