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Indebtedness - Activity (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended
Aug. 31, 2014
Sep. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Aug. 31, 2012
Dec. 31, 2014
Feb. 28, 2012
Oct. 08, 2013
Dec. 31, 2013
Mar. 31, 2014
Debt Instrument [Line Items]                    
Debt, Weighted Average Interest Rate     5.30%us-gaap_DebtWeightedAverageInterestRate     5.00%us-gaap_DebtWeightedAverageInterestRate     5.10%us-gaap_DebtWeightedAverageInterestRate  
Credit Facility [Domain] | Old Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Capacity Available for Trade Purchases                   $ 500us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= lry_OldCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CreditFacilityDomain
Credit Facility [Domain] | New Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Capacity Available for Trade Purchases                   800us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= lry_NewCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CreditFacilityDomain
Senior Notes [Member] | 5.65% Senior Note [Member]                    
Debt Instrument [Line Items]                    
Stated Interest Rate 5.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lry_A5.65SeniorNoteMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                  
Repayments of Senior Debt 200.0us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= lry_A5.65SeniorNoteMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                  
Debt Instrument, Maturity Date, Description August 2014                  
Senior Notes [Member] | 4.40% senior unsecured note [Member]                    
Debt Instrument [Line Items]                    
Stated Interest Rate   4.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lry_A4.40seniorunsecurednoteMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                
Debt Instrument, Face Amount   450us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lry_A4.40seniorunsecurednoteMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                
Debt Instrument, Maturity Date, Description   2024                
Senior Notes [Member] | 3.375% senior note [Member]                    
Debt Instrument [Line Items]                    
Stated Interest Rate     3.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lry_A3375SeniorNoteMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		              
Debt Instrument, Face Amount     300us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lry_A3375SeniorNoteMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		              
Debt Instrument, Maturity Date, Description     2023              
Senior Notes [Member] | 4.125% Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Stated Interest Rate       4.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lry_A4125SeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		            
Debt Instrument, Face Amount       400us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lry_A4125SeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		            
Debt Instrument, Maturity Date, Description       2022            
Senior Notes [Member] | 6.375% Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Stated Interest Rate         6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lry_A6375SeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		          
Repayments of Senior Debt         230.1us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= lry_A6375SeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		          
Debt Instrument, Term         10 years          
Debt Instrument, Maturity Date, Description         August 2012          
Mortgages [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Maturity Date Range, Start           Jan. 01, 2016        
Debt Instrument, Maturity Date Range, End           Dec. 31, 2033        
Mortgages [Member] | 4.84% Mortgage Loan [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Maturity Date, Description             2033      
Debt, Weighted Average Interest Rate             4.84%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= lry_A4.84MortgageLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		      
Debt Instrument, Borrowing Capacity, Amount             45lry_DebtInstrumentBorrowingCapacityAmount
/ us-gaap_DebtInstrumentAxis
= lry_A4.84MortgageLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		      
Cabot Industrial Value Fund III [Member] | Mortgages [Member]                    
Debt Instrument [Line Items]                    
Assumption of mortgage debt from acquisition               $ 229.8us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= lry_CabotIndustrialValueFundIIIMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		    
Debt, Weighted Average Interest Rate               5.85%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_BusinessAcquisitionAxis
= lry_CabotIndustrialValueFundIIIMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		    
Debt Instrument, Maturity Date Range, Start               Jan. 01, 2018    
Debt Instrument, Maturity Date Range, End               Dec. 31, 2021