Summary of Significant Accounting Policies (Adjustment of Previously Reported Financial Information, Equity) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accumulated other comprehensive loss	$ (56,031)	$ (22,506)
Distributions in excess of net income	(596,635)	(674,688)
Total Liberty Property Trust shareholders' equity	3,003,391	2,972,581
Noncontrolling interest - operating partnership	54,631	53,754
Total equity	3,062,923	3,030,254	$ 3,106,312	$ 3,117,062	[1]
Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accumulated other comprehensive loss		(22,506)		7,437
Distributions in excess of net income		(674,688)		(569,193)
Total Liberty Property Trust shareholders' equity		2,972,581		3,056,059
Noncontrolling interest - operating partnership		53,754		57,381
Total equity		3,030,254		3,117,062
Restatement of Net Profit (Loss) [Member] | Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accumulated other comprehensive loss		(17,893)		9,742
Distributions in excess of net income		(698,954)		(591,713)
Total Liberty Property Trust shareholders' equity		2,952,928		3,035,844
Noncontrolling interest - operating partnership		53,100		56,713
Total equity		3,009,947		3,096,179
Restatement of Net Profit (Loss) [Member] | Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accumulated other comprehensive loss		(4,613)		(2,305)
Distributions in excess of net income		24,266		22,520
Total Liberty Property Trust shareholders' equity		19,653		20,215
Noncontrolling interest - operating partnership		654		668
Total equity		20,307		20,883
Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General Partner's equity	3,003,391	2,972,581
Limited partners' equity	54,631	53,754
Total equity	$ 3,062,923	3,030,254	$ 3,106,312	3,117,062	[2]
Liberty Property Limited Partnership [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General Partner's equity		2,972,581		3,056,059
Limited partners' equity		53,754		57,381
Total equity		3,030,254		3,117,062
Liberty Property Limited Partnership [Member] | Restatement of Net Profit (Loss) [Member] | Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General Partner's equity		2,952,928		3,035,844
Limited partners' equity		53,100		56,713
Total equity		3,009,947		3,096,179
Liberty Property Limited Partnership [Member] | Restatement of Net Profit (Loss) [Member] | Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General Partner's equity		19,653		20,215
Limited partners' equity		654		668
Total equity		$ 20,307		$ 20,883

[1] The Company adjusted the January 1, 2014 balances of Accumulated Other Comprehensive (Loss) Income, Distributions in Excess of Net Income, and Noncontrolling Interest - Operating Partnership - Common from previous filings. See Note 2.

[2] The Company adjusted the January 1, 2014 balances of General Partner's Equity and Limited Partners' Equity - Common Units from previous filings. See Note 2.