Noncontrolling Interests - Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Stockholders' Equity Attributable to Noncontrolling Interest [Abstract]
Common units, units outstanding	3,808,746	3,808,746
Market value of common units based on closing price	$ 136.0

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