Noncontrolling Interests - Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Stockholders' Equity Attributable to Noncontrolling Interest [Abstract]
Common units, units outstanding	3,740,246	3,808,746
Market value of common units based on closing price	$ 137.8

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