CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Gross revenues:
Rental	$ 97,649	$ 87,565	$ 192,171	$ 176,219
Tenant reimbursements	7,844	8,119	15,959	15,564
Total gross revenues	105,493	95,684	208,130	191,783
Expense applicable to revenues:
Depreciation and amortization	(45,440)	(42,320)	(91,977)	(85,211)
General and administrative	(7,421)	(8,141)	(16,417)	(17,598)
Non-operating income	354	1,371	900	3,992
Interest and amortization expense	(21,734)	(19,216)	(42,065)	(38,941)
Debt satisfaction charges, net	0	(46)	0	(46)
Impairment charges and loan loss	(35,269)	(13,599)	(88,318)	(21,591)
Gains on sales of properties	14,432	10,240	37,206	44,433
Income (loss) before provision for income taxes and equity in earnings (losses) of non-consolidated entities	(491)	10,999	(14,924)	51,731
Provision for income taxes	(379)	(377)	(882)	(799)
Equity in earnings (losses) of non-consolidated entities	75	(3,257)	188	(1,347)
Net income (loss)	(795)	7,365	(15,618)	49,585
Less net income attributable to noncontrolling interests	(899)	(213)	(391)	(393)
Net income (loss) attributable to Lexington Realty Trust shareholders	(1,694)	7,152	(16,009)	49,192
Allocation to participating securities	(60)	(60)	(130)	(131)
Net income (loss) attributable to common shareholders	$ (3,327)	$ 5,519	$ (19,284)	$ 45,916
Net income (loss) attributable to common shareholders - per common share basic (in dollars per share)	$ (0.01)	$ 0.02	$ (0.08)	$ 0.19
Weighted-average common shares outstanding – basic (in shares)	237,312,726	237,720,198	237,690,306	237,451,355
Net income (loss) attributable to common shareholders – per common share diluted (in dollars per share)	$ (0.01)	$ 0.02	$ (0.08)	$ 0.19
Weighted-average common shares outstanding – diluted (in shares)	237,312,726	241,531,313	237,690,306	241,310,529
Series C [Member]
Expense applicable to revenues:
Dividends attributable to preferred shares – Series C	$ (1,573)	$ (1,573)	$ (3,145)	$ (3,145)
Property Operating [Member]
Expense applicable to revenues:
Property operating	(10,906)	(12,974)	(22,383)	(25,090)
LCIF [Member]
Gross revenues:
Rental	19,846	18,691	39,789	35,999
Tenant reimbursements	1,828	1,955	3,992	3,928
Total gross revenues	21,674	20,646	43,781	39,927
Expense applicable to revenues:
Depreciation and amortization	(9,239)	(9,209)	(18,111)	(18,381)
General and administrative	(1,888)	(1,853)	(3,673)	(3,292)
Non-operating income	165	3	167	232
Interest and amortization expense	(5,381)	(3,932)	(10,393)	(7,339)
Impairment charges and loan loss	(1,208)	(2,762)	(23,938)	(5,259)
Gains on sales of properties	14,432	0	15,362	0
Income (loss) before provision for income taxes and equity in earnings (losses) of non-consolidated entities	16,239	(149)	(2,235)	(711)
Provision for income taxes	(25)	(18)	(37)	(26)
Equity in earnings (losses) of non-consolidated entities	72	159	324	259
Net income (loss)	$ 16,286	$ (8)	$ (1,948)	$ (478)
Net income (loss) per unit (in dollars per unit)	$ 0.20	$ 0.00	$ (0.02)	$ (0.01)
Weighted-average units outstanding (in units)	80,565,611	83,241,396	80,565,611	83,241,396
LCIF [Member] | Property Operating [Member]
Expense applicable to revenues:
Property operating	$ (2,316)	$ (3,042)	$ (5,430)	$ (6,599)