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Income per Common Unit of the Operating Partnership (Details) (USD $)
In Thousands, except Share data
3 Months Ended9 Months Ended12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Income Per Common Unit [Line Items]     
Income from continuing operations net of noncontrolling interest$ 30,535$ 31,108$ 89,993$ 85,131 
Net Income (Loss) Available to Common Stockholders, Basic35,32034,644149,20797,640 
Weighted Average Number of Shares Outstanding, Basic115,014,000113,077,000114,547,000112,708,000 
Earnings Per Share, Basic$ 0.31$ 0.31$ 1.30$ 0.87 
Income (Loss) from Continuing Operations, Per Basic Share$ 0.27$ 0.28$ 0.78$ 0.76 
Dilutive units for long-term compensation plans766,000696,000782,000680,000 
Weighted Average Number of Shares Outstanding, Diluted115,780,000113,773,000115,329,000113,388,000 
Earnings Per Share, Diluted$ 0.31$ 0.30$ 1.29$ 0.86 
Income (Loss) from Continuing Operations, Per Diluted Share$ 0.27$ 0.27$ 0.78$ 0.75 
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest4,9433,65961,20912,944 
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share$ 0.04$ 0.03$ 0.52$ 0.11 
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share$ 0.04$ 0.03$ 0.51$ 0.11 
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount1,641,0002,239,0001,219,0001,433,000 
Stock Issued During Period, Shares, Stock Options Exercised29,000 200,000 315,000
Liberty Property Limited Partnership [Member]
     
Income Per Common Unit [Line Items]     
Income from continuing operations net of noncontrolling interest36,79137,436108,767103,851 
Less: Preferred unit distributions(5,253)(5,253)(15,759)(15,759) 
Net income loss available to common stock holders basic income from continuing operations31,53832,18393,00888,092 
Net Income (Loss) Available to Common Stockholders, Basic36,48135,842154,217101,036 
Weighted Average Number of Shares Outstanding, Basic118,830,000117,020,000118,437,000116,657,000 
Earnings Per Share, Basic$ 0.31$ 0.31$ 1.30$ 0.87 
Income (Loss) from Continuing Operations, Per Basic Share$ 0.27$ 0.28$ 0.78$ 0.76 
Dilutive units for long-term compensation plans766,000696,000782,000680,000 
Net income loss available to common stock holders diluted income from continuing operations31,53832,18393,00888,092 
Weighted Average Number of Shares Outstanding, Diluted119,596,000117,716,000119,219,000117,337,000 
Earnings Per Share, Diluted$ 0.31$ 0.30$ 1.29$ 0.86 
Income (Loss) from Continuing Operations, Per Diluted Share$ 0.27$ 0.27$ 0.78$ 0.75 
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest$ 4,943$ 3,659$ 61,209$ 12,944 
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share$ 0.04$ 0.03$ 0.52$ 0.11 
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share$ 0.04$ 0.03$ 0.51$ 0.11 
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount1,641,0002,239,0001,219,0001,433,000 
Stock Issued During Period, Shares, Stock Options Exercised29,000 200,000 315,000