2.4.0.82109100 - Disclosure - Continuous Equity Offering Continuous Equity Offering (Notes)truefalsefalse1false falsefalseD2013Q2YTDhttp://www.sec.gov/CIK0000921112duration2013-01-01T00:00:002013-06-30T00:00:001true 1lry_ContinuousEquityOfferingAbstractlry_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Continuous Equity Offering [Abstract]2false 2lry_EquityOfferingProgramTextBlocklry_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;font-size:10pt;">Continuous Equity Offering</div><div style="line-height:120%;text-align:justify;font-size:10pt;"> </div><div style="line-height:120%;text-align:justify;font-size:10pt;">The Company has a continuous equity offering program in place for up to $200 million of equity. During the three and six months ended June 30, 2013, the Company sold 1.2 million and 1.9 million common shares, respectively, through this program. The aggregate proceeds from the offering for the three and six months ended June 30, 2013 of $50.4 million and $75.0 million, respectively, were used to pay down outstanding borrowings under the Company's unsecured credit facility and for general corporate purposes.</div></div>falsefalsefalsenonnum:textBlockItemTypenaThe entire disclosure about shares offering programs during the period presented.No definition available.false0Equity Offering Program [Text Block]falseContinuous Equity Offering Continuous Equity Offering (Notes)UnKnownUnKnownUnKnownUnKnowntruefalsefalseNoteshttp://www.libertyproperty.com/role/ContinuousEquityOfferingContinuousEquityOfferingNotes12