Organization and Basis of Presentation (Details) - USD ($)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2015	Dec. 31, 2014
Organization [Abstract]
Ownership interest in operating partnership - Limited Partnership		97.70%
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Common shares of beneficial interest		$ 148,000	$ 149,000
Additional paid-in capital		$ 3,673,001,000	3,688,644,000
Parent balance sheet, equity reclassification [Member] | Adjustment to prior period balance [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Common shares of beneficial interest			(1,000)
Additional paid-in capital			(51,900,000)
Impact of Error on Income Statement	$ 0
Impact of Error on Statement of Cash Flow	0
Parent balance sheet, equity reclassification [Member] | Previously reported amounts [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Common shares of beneficial interest			150,000
Additional paid-in capital			3,740,600,000
Liberty Property Limited Partnership [Member] | Parent balance sheet, equity reclassification [Member] | Adjustment to prior period balance [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Impact of Error on Income Statement	0
Impact of Error on Statement of Cash Flow	$ 0
Impact of Error on Balance Sheet			$ 0