Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2016
Commitments and Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies In addition to the commitments and contingencies disclosed elsewhere, including in Note 12 above, and previously disclosed, the Company has the following commitments and contingencies. The Company is obligated under certain tenant leases, including its proportionate share for leases for non-consolidated entities, to fund the expansion of the underlying leased properties. The Company, under certain circumstances, may guarantee to tenants the completion of base building improvements and the payment of tenant improvement allowances and lease commissions on behalf of its subsidiaries. From time to time, the Company is directly and indirectly involved in legal proceedings arising in the ordinary course of business. Management believes, based on currently available information, and after consultation with legal counsel, that although the outcomes of those normal course proceedings are uncertain, the results of such proceedings, in the aggregate, will not have a material adverse effect on the Company's business, financial condition and results of operations. GSMSC II 2006-GG6 Bridgewater Hills Corporate Center, LLC v. Lexington Realty Trust (Supreme Court of the State of New York, County of New York-Index No. 653117/2015) On September 16, 2015, GSMSC II 2006-GG6 Bridgewater Hills Corporate Center, LLC commenced an action as lender against the Company based on a limited guaranty of recourse obligations executed by a predecessor entity of the Company in connection with a mortgage loan secured by a property owner subsidiary's commercial property in Bridgewater, New Jersey. The property owner subsidiary defaulted due to non-payment after the sole tenant vacated at the end of the lease term. The lender seeks approximately $15,500 in order to satisfy the outstanding amount of the loan, plus interest, reasonable attorney’s fees and other costs and disbursements related thereto. The Company has not recorded any liability relating to this litigation as of September 30, 2016 as the Company believes that a loss contingency is “reasonably possible” (as defined by FASB ASC 450-20-20) but not “probable” (as defined by FASB ASC 450-20-20). The lender claims that the Company's limited guaranty was triggered due to the merger of Newkirk Realty Trust, Inc. and Lexington Corporate Properties Trust on December 31, 2006, arguing that it constituted an event of default because it was a transfer that was not permitted by the loan agreement. The limited guaranty provides that the guarantor's liability for the guaranteed obligations shall not exceed $10,000, which the Company believes is its maximum exposure to loss. The Company intends to vigorously defend the lender’s claim. The Company filed a motion to dismiss on October 19, 2015 and a hearing was scheduled for June 15, 2016, which was canceled by the Court. The Company is awaiting the Court's ruling on the Company's motion to dismiss. The lender also brought a foreclosure action against the property owner subsidiary. A foreclosure sale was held September 13, 2016 and the lender acquired the property for a nominal amount and, as such, the Company derecognized the property and related debt obligation. The carrying value of the property, which approximated fair value, was less than the non-recourse mortgage and related accrued interest, resulting in a gain on debt extinguishment of $8,761 for the nine months ended September 30, 2016.
LCIF [Member]
Commitments and Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies In addition to the commitments and contingencies disclosed elsewhere, the Partnership has the following commitments and contingencies. The Partnership is obligated under certain tenant leases, including its proportionate share for leases for non-consolidated entities, to fund the expansion of the underlying leased properties. The Partnership, under certain circumstances, may guarantee to tenants the completion of base building improvements and the payment of tenant improvement allowances and lease commissions on behalf of its subsidiaries. In May 2014, the Partnership guaranteed $250,000 aggregate principal amount of 4.40% Senior Notes due 2024 (“2024 Senior Notes”) issued by Lexington at an issuance price of 99.883% of the principal amount and in June 2013, the Partnership guaranteed $250,000 aggregate principal amount of 4.25% Senior Notes due 2023 (“ 2023 Senior Notes”) issued by Lexington at an issuance price of 99.026% of the principal amount, collectively referred to as the Senior Notes. The Senior Notes are unsecured and pay interest semi-annually in arrears. Lexington may redeem the Senior Notes at its option at any time prior to maturity in whole or in part by paying the principal amount of the notes being redeemed plus a premium. During 2010, the Partnership guaranteed $115,000 aggregate principal amount of 6.00% Convertible Guaranteed Notes due 2030 (“Guaranteed Notes”) issued by Lexington. The Guaranteed Notes paid interest semi-annually in arrears and were scheduled to mature in January 2030. As of September 30, 2016, the Partnership was relieved of its guarantee of the Guaranteed Notes as all outstanding amounts under the Guaranteed Notes were satisfied. From time to time, the Partnership is directly or indirectly involved in legal proceedings arising in the ordinary course of the Partnership's business. The Partnership believes, based on currently available information, and after consultation with legal counsel, that although the outcomes of those normal course proceedings are uncertain, the results of such proceedings, in the aggregate, will not have a material adverse effect on the Partnership's business, financial condition and results of operations.