Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2016
Commitments and Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies In addition to the commitments and contingencies disclosed elsewhere, 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. The Company and LCIF are parties to a funding agreement under which the Company may be required to fund distributions made on account of LCIF's OP units. Pursuant to the funding agreement, the parties agreed that, if LCIF does not have sufficient cash available to make a quarterly distribution to its limited partners in an amount in accordance with the partnership agreement, Lexington will fund the shortfall. Payments under the agreement will be made in the form of loans to LCIF and will bear interest at prevailing rates as determined by the Company in its discretion but, no less than the applicable federal rate. LCIF's right to receive these loans will expire if no OP units remain outstanding and all such loans repaid. No amounts have been advanced under this agreement. From time to time, the Company is directly or 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 currently seeks approximately $9,200 in order to satisfy the outstanding amount of the loan after offset for the lender's asserted value of the property it obtained in foreclosure, plus interest, reasonable attorney’s fees and other costs and disbursements related thereto. The Company had not recorded any liability relating to this litigation as of December 31, 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, which was generally denied. The Company is currently conducting discovery, with document production required to be completed by March 31, 2017, fact depositions to be completed by August 28, 2017 and expert dispositions to be completed by October 31, 2017. Other. Four of the Company's executive officers have employment contracts and are entitled to severance benefits upon termination by the Company without cause or termination by the executive officer with good reason, in each case, as defined in the employment contract. In addition, the Company's other two executive officers and certain other members of the Company's senior management are entitled to severance benefits upon the same events.
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. The Partnership and Lexington are parties to a funding agreement under which Lexington may be required to fund distributions made on account of OP units. Pursuant to the funding agreement, the parties agreed that, if the Partnership does not have sufficient cash available to make a quarterly distribution to its limited partners in an amount in accordance with the partnership agreement, Lexington will fund the shortfall. Payments under the agreement will be made in the form of loans to the Partnership and will bear interest at prevailing rates as determined by Lexington in its discretion, but no less than the applicable federal rate. The Partnership's right to receive these loans will expire if no OP units remain outstanding and all such loans repaid. No amounts have been advanced under this agreement. 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. 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 the Senior Notes. The Senior Notes are unsecured, pay interest semi-annually in arrears and mature in June 2024 and 2023, respectively. Lexington may redeem the 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 issued by Lexington. The notes paid interest semi-annually in arrears and were scheduled to mature in January 2030. As of December 31, 2016, the Partnership was relieved of its guarantee of the notes as all outstanding amounts under the notes were satisfied.