The Company	12 Months Ended
The Company	Dec. 31, 2017
Variable Interest Entity [Line Items]
The Company/Partnership	The Company Lexington Realty Trust (together with its consolidated subsidiaries, except when the context only applies to the parent entity, the “Company”) is a Maryland statutory real estate investment trust (“REIT”) that owns a diversified portfolio of equity investments in single-tenant commercial properties. As of December 31, 2017, the Company had equity ownership interests in approximately 175 consolidated properties located in 37 states. The properties in which the Company has an interest are primarily net-leased to tenants in various industries. The Company believes it has qualified as a REIT under the Internal Revenue Code of 1986, as amended (the “Code”). Accordingly, the Company will not be subject to federal income tax, provided that distributions to its shareholders equal at least the amount of its REIT taxable income as defined under the Code. The Company is permitted to participate in certain activities from which it was previously precluded in order to maintain its qualification as a REIT, so long as these activities are conducted in entities which elect to be treated as taxable REIT subsidiaries (“TRS”) under the Code. As such, the TRS are subject to federal income taxes on the income from these activities. The Company conducts its operations either directly or indirectly through (1) property owner subsidiaries and lender subsidiaries, which are single purpose entities, (2) an operating partnership, Lepercq Corporate Income Fund L.P. (“LCIF”), in which the Company is the sole unit holder of the general partner and the sole unit holder of the limited partner that holds a majority of the limited partner interests, (3) a wholly-owned TRS, Lexington Realty Advisors, Inc. (“LRA”), and (4) investments in joint ventures. References to “OP Units” refer to units of limited partner interests in LCIF. Property owner subsidiaries are landlords under leases for properties in which the Company has an interest and/or borrowers under loan agreements secured by properties in which the Company has an interest and lender subsidiaries are lenders under loan agreements where the Company made an investment in a loan asset, but in all cases are separate and distinct legal entities. Each property owner subsidiary is a separate legal entity that maintains separate books and records. The assets and credit of each property owner subsidiary with a property subject to a mortgage loan are not available to creditors to satisfy the debt and other obligations of any other person, including any other property owner subsidiary or any other affiliate. Consolidated entities that are not property owner subsidiaries do not directly own any of the assets of a property owner subsidiary (or the general partner, member or managing member of such property owner subsidiary), but merely hold partnership, membership or beneficial interest therein, which interests are subordinate to the claims of such property owner subsidiary's (or its general partner's, member's or managing member's) creditors.
LCIF [Member]
Variable Interest Entity [Line Items]
The Company/Partnership	The Partnership Lepercq Corporate Income Fund L.P. (together with its consolidated subsidiaries, except when the context only applies to the parent entity, the “Partnership”) was organized in 1986 as a limited partnership under the Delaware Revised Uniform Limited Partnership Act. The Partnership's sole general partner, Lex GP-1 Trust (the “General Partner”), is a wholly-owned subsidiary of Lexington Realty Trust (“Lexington”). The Partnership is an operating partnership subsidiary of Lexington. As of December 31, 2017, Lexington, through Lex LP-1 Trust, a wholly-owned subsidiary, and the General Partner owned approximately 96.0% of the outstanding units of the Partnership. As of December 31, 2017, the Partnership had equity ownership interests in 32 consolidated real estate properties located in 20 states. The properties in which the Partnership has an interest are primarily net-leased to tenants in various industries. A majority of the real properties in which the Partnership had an interest are generally subject to net leases or similar leases where the tenant pays all or substantially all of the cost, including cost increases, for real estate taxes, insurance, utilities and ordinary maintenance of the property. However, certain leases provide that the landlord is responsible for certain operating expenses. Property owner subsidiaries are landlords under leases for properties in which the Partnership has an interest and/or borrows under loan agreements secured by properties in which the Partnership has an interest and lender subsidiaries are lenders under loan agreements where the Partnership made an investment in a loan asset, but in all cases are separate and distinct legal entities. The assets and credit of a property owner subsidiary or lender subsidiary are not available to satisfy the debt and other obligations of any other person, including any other property owner subsidiary or lender subsidiary or any other affiliate.