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Indebtedness (Details) (Senior Notes [Member], USD $)
In Millions, unless otherwise specified
Mar. 01, 2015
5.125% Senior Notes [Member]
  
Unsecured Notes [Abstract]  
Debt Instrument, Repurchased Face Amount $ 300us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= lry_A5.125SeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Interest Rate 5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lry_A5.125SeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
3.75% Senior Notes [Member]
  
Unsecured Notes [Abstract]  
Debt Instrument, Face Amount $ 400us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lry_A3.75SeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Interest Rate 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lry_A3.75SeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember