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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 18, 2020
Jun. 28, 2019
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period Ended Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 1-12386    
Entity Registrant Name LEXINGTON REALTY TRUST    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 13-3717318    
Entity Address, Address Line One One Penn Plaza    
Entity Address, Address Line Two Suite 4015    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10119-4015    
City Area Code 212    
Local Phone Number 692-7200    
Entity Well-known Seasoned User Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 2,160,905,597
Entity Common Stock, Shares Outstanding (in shares)   254,941,588  
Documents Incorporated by Reference
Certain information contained in the Definitive Proxy Statement for Lexington Realty Trust's Annual Meeting of Shareholders, to be held on May 19, 2020, is incorporated by reference in this Annual Report on Form 10-K in response to Part III, Items 10, 11, 12, 13 and 14, which will be filed with the Securities and Exchange Commission not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.
    
Entity Central Index Key 0000910108    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Amendment Flag false    
Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Shares of beneficial interest, par value $0.0001 per share, classified as Common Stock    
Trading Symbol LXP    
Security Exchange Name NYSE    
Series C      
Document Information [Line Items]      
Title of 12(b) Security 6.50% Series C Cumulative Convertible Preferred Stock, par value $0.0001 per share    
Trading Symbol LXPPRC    
Security Exchange Name NYSE