Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
OPERATING REVENUE
Rental	$ 139,377	$ 106,955	$ 278,311	$ 211,670
Operating expense reimbursement	53,582	44,069	112,263	86,480
Total operating revenue	192,959	151,024	390,574	298,150
OPERATING EXPENSE
Rental property	31,928	26,684	70,489	51,913
Real estate taxes	25,716	18,906	50,217	36,863
General and administrative	14,973	16,455	33,334	36,248
Depreciation and amortization	57,872	37,527	114,606	74,748
Total operating expenses	130,489	99,572	268,646	199,772
Operating income	62,470	51,452	121,928	98,378
OTHER INCOME (EXPENSE)
Other income	3,117	5,352	5,570	9,732
Interest expense	(38,470)	(28,133)	(77,677)	(55,872)
Total other income (expense)	(35,353)	(22,781)	(72,107)	(46,140)
Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures	27,117	28,671	49,821	52,238
Gain on property dispositions	1,896	0	1,896	0
Income taxes	(693)	(660)	(1,224)	(1,151)
Equity in earnings of unconsolidated joint ventures	1,546	1,566	5,705	3,323
Income from continuing operations	29,866	29,577	56,198	54,410
Discontinued operations (including net gain on property dispositions of $140 and $7,658 for the quarters ended June 30, 2014 and 2013, respectively and $46,256 and $49,364 for the six month periods ended June 30, 2014 and 2013, respectively)	241	13,666	48,015	63,489
Net income	30,107	43,243	104,213	117,899
Noncontrolling interest – operating partnership	(821)	(3,134)	(2,674)	(6,551)
Noncontrolling interest - consolidated joint ventures	(37)	0	(390)	0
Net income available to common shareholders	29,249	40,109	101,149	111,348
Comprehensive income attributable to common shareholders
Net income	30,107	43,243	104,213	117,899
Other comprehensive income - foreign currency translation	6,464	40	7,811	(4,812)
Other comprehensive loss - change in net unrealized gain on derivative instruments	(1,145)	0	(1,656)	0
Other comprehensive income	5,319	40	6,155	(4,812)
Total comprehensive income	35,426	43,283	110,368	113,087
Less: comprehensive income attributable to noncontrolling interest	(983)	(3,135)	(3,209)	(6,406)
Comprehensive income attributable to common shareholders	34,443	40,148	107,159	106,681
Basic:
Income from continuing operations	$ 0.20	$ 0.22	$ 0.37	$ 0.42
Income from discontinued operations	$ 0.00	$ 0.11	$ 0.32	$ 0.51
Income per common share - basic	$ 0.20	$ 0.33	$ 0.69	$ 0.93
Diluted:
Income from continuing operations	$ 0.20	$ 0.22	$ 0.37	$ 0.42
Income from discontinued operations	$ 0.00	$ 0.11	$ 0.32	$ 0.51
Income per common share - diluted	$ 0.20	$ 0.33	$ 0.69	$ 0.93
Distributions per common share or unit	$ 0.475	$ 0.475	$ 0.95	$ 0.95
Weighted average number of common shares outstanding
Basic	147,012	120,081	146,749	119,416
Diluted	147,774	120,911	147,444	120,229
Amounts attributable to common shareholders
Income from continuing operations	29,014	26,848	54,262	49,751
Discontinued operations	235	13,261	46,887	61,597
Net income available to common shareholders	29,249	40,109	101,149	111,348
Liberty Property Limited Partnership [Member]
OPERATING REVENUE
Rental	139,377	106,955	278,311	211,670
Operating expense reimbursement	53,582	44,069	112,263	86,480
Total operating revenue	192,959	151,024	390,574	298,150
OPERATING EXPENSE
Rental property	31,928	26,684	70,489	51,913
Real estate taxes	25,716	18,906	50,217	36,863
General and administrative	14,973	16,455	33,334	36,248
Depreciation and amortization	57,872	37,527	114,606	74,748
Total operating expenses	130,489	99,572	268,646	199,772
Operating income	62,470	51,452	121,928	98,378
OTHER INCOME (EXPENSE)
Other income	3,117	5,352	5,570	9,732
Interest expense	(38,470)	(28,133)	(77,677)	(55,872)
Total other income (expense)	(35,353)	(22,781)	(72,107)	(46,140)
Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures	27,117	28,671	49,821	52,238
Gain on property dispositions	1,896	0	1,896	0
Income taxes	(693)	(660)	(1,224)	(1,151)
Equity in earnings of unconsolidated joint ventures	1,546	1,566	5,705	3,323
Income from continuing operations	29,866	29,577	56,198	54,410
Discontinued operations (including net gain on property dispositions of $140 and $7,658 for the quarters ended June 30, 2014 and 2013, respectively and $46,256 and $49,364 for the six month periods ended June 30, 2014 and 2013, respectively)	241	13,666	48,015	63,489
Net income	30,107	43,243	104,213	117,899
Noncontrolling interest - consolidated joint ventures	(37)	0	(390)	0
Preferred unit distributions	(118)	(672)	(236)	(1,883)
Excess of preferred unit redemption over carrying amount	0	(1,236)	0	(1,236)
Net income available to common shareholders	29,952	41,335	103,587	114,780
Comprehensive income attributable to common shareholders
Net income	30,107	43,243	104,213	117,899
Other comprehensive income - foreign currency translation	6,464	40	7,811	(4,812)
Other comprehensive loss - change in net unrealized gain on derivative instruments	(1,145)	0	(1,656)	0
Other comprehensive income	5,319	40	6,155	(4,812)
Total comprehensive income	35,426	43,283	110,368	113,087
Basic:
Income from continuing operations	$ 0.20	$ 0.22	$ 0.37	$ 0.42
Income from discontinued operations	$ 0.00	$ 0.11	$ 0.32	$ 0.51
Income per common share - basic	$ 0.20	$ 0.33	$ 0.69	$ 0.93
Diluted:
Income from continuing operations	$ 0.20	$ 0.22	$ 0.37	$ 0.42
Income from discontinued operations	$ 0.00	$ 0.11	$ 0.32	$ 0.51
Income per common share - diluted	$ 0.20	$ 0.33	$ 0.69	$ 0.93
Distributions per common share or unit	$ 0.475	$ 0.475	$ 0.95	$ 0.95
Weighted average number of common shares outstanding
Basic	150,563	123,795	150,304	123,130
Diluted	151,325	124,625	150,999	123,943
Net income allocated to general partners	29,249	40,109	101,149	111,348
Net income allocated to limited partners	821	3,134	2,674	6,551
Amounts attributable to common shareholders
Income from continuing operations	29,829	29,577	55,808	54,410
Net income available to common shareholders	$ 29,952	$ 41,335	$ 103,587	$ 114,780