Noncontrolling Interests - Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Stockholders' Equity Attributable to Noncontrolling Interest [Abstract]
Common units, units outstanding	3,713,851	3,713,851
Market value of common units based on closing price	$ 147.6

Noncontrolling Interest Operating Partnership Common Units Outstanding.

No definition available.

Name:	lry_NoncontrollingInterestOperatingPartnershipCommonUnitsOutstanding
Namespace Prefix:	lry_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant