Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 02, 2018
Entity Information [Line Items]
Entity Registrant Name	LEXINGTON REALTY TRUST
Entity Central Index Key	0000910108
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		236,274,338
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Document Period Ended Date	Sep. 30, 2018
Entity Small Business	false
Entity Emerging Growth	false
LCIF [Member]
Entity Information [Line Items]
Entity Registrant Name	LEPERCQ CORPORATE INCOME FUND L.P.
Entity Central Index Key	0000790877
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		0
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Document Period Ended Date	Sep. 30, 2018
Entity Small Business	false
Entity Emerging Growth	false