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Segment Information - Real Estate Assets by Segment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Real estate assets $ 5,897,569us-gaap_RealEstateInvestmentPropertyNet $ 5,658,248us-gaap_RealEstateInvestmentPropertyNet
North America [Member] | Operating Segments [Member] | Carolinas [Member]    
Segment Reporting Information [Line Items]    
Real estate assets 309,822us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_CarolinasMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 245,938us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_CarolinasMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
North America [Member] | Operating Segments [Member] | Chicago Milwaukee [Member]    
Segment Reporting Information [Line Items]    
Real estate assets 383,494us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_ChicagoMilwaukeeMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 371,149us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_ChicagoMilwaukeeMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
North America [Member] | Operating Segments [Member] | Houston [Member]    
Segment Reporting Information [Line Items]    
Real estate assets 398,080us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_HoustonMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 360,779us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_HoustonMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
North America [Member] | Operating Segments [Member] | Lehigh Central PA [Member]    
Segment Reporting Information [Line Items]    
Real estate assets 958,886us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_LehighCentralPAMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 877,969us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_LehighCentralPAMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
North America [Member] | Operating Segments [Member] | Minnesota [Member]    
Segment Reporting Information [Line Items]    
Real estate assets 307,970us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_MinnesotaMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 308,272us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_MinnesotaMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
North America [Member] | Operating Segments [Member] | Orlando [Member]    
Segment Reporting Information [Line Items]    
Real estate assets 139,218us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_OrlandoMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 228,182us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_OrlandoMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
North America [Member] | Operating Segments [Member] | Philadelphia [Member]    
Segment Reporting Information [Line Items]    
Real estate assets 255,313us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_PhiladelphiaMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 229,769us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_PhiladelphiaMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
North America [Member] | Operating Segments [Member] | Richmond Hampton Roads [Member]    
Segment Reporting Information [Line Items]    
Real estate assets 238,670us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_RichmondHamptonRoadsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 238,129us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_RichmondHamptonRoadsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
North America [Member] | Operating Segments [Member] | South Florida [Member]    
Segment Reporting Information [Line Items]    
Real estate assets 378,398us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_SouthFloridaMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 358,492us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_SouthFloridaMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
North America [Member] | Operating Segments [Member] | Southeastern PA [Member]    
Segment Reporting Information [Line Items]    
Real estate assets 636,280us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_SoutheasternPAMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 630,460us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_SoutheasternPAMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
North America [Member] | Operating Segments [Member] | Tampa [Member]    
Segment Reporting Information [Line Items]    
Real estate assets 317,106us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_TampaMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 320,495us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_TampaMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
North America [Member] | Operating Segments [Member] | Other Segments [Member]    
Segment Reporting Information [Line Items]    
Real estate assets 1,391,744us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 1,300,915us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
UNITED KINGDOM | Operating Segments [Member] | United Kingdom [Member]    
Segment Reporting Information [Line Items]    
Real estate assets $ 182,588us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_UnitedKingdomMember
/ us-gaap_StatementGeographicalAxis
= country_GB		 $ 187,699us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lry_UnitedKingdomMember
/ us-gaap_StatementGeographicalAxis
= country_GB