The Company and Financial Statement Presentation (Policies)	3 Months Ended
	Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Basis of presentation and consolidation	Basis of Presentation and Consolidation. The Company's unaudited condensed consolidated financial statements are prepared on the accrual basis of accounting in accordance with GAAP. The financial statements reflect the accounts of the Company and its consolidated subsidiaries.
Variable interest entity	The Company consolidates the wholly-owned subsidiaries, partnerships and joint ventures which it controls (i) through voting rights or similar rights or (ii) by means other than voting rights if the Company is the primary beneficiary of a variable interest entity ("VIE"). Entities which the Company does not control and entities which are VIEs in which the Company is not a primary beneficiary are accounted for under appropriate GAAP. The Company is the primary beneficiary of certain VIEs as it has a controlling financial interest in these entities. LCIF, which is consolidated and in which the Company has an approximate 96% interest, is a VIE.
Use of estimates	Use of Estimates. Management has made a number of significant estimates and assumptions to prepare these unaudited condensed consolidated financial statements in conformity with GAAP, including, among others, those relating to the reporting of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors. Management adjusts such estimates when facts and circumstances dictate. The most significant estimates made include the recoverability of accounts receivable, the allocation of property purchase price to tangible and intangible assets acquired and liabilities assumed, the determination of VIEs and which entities should be consolidated, the determination of impairment of long-lived assets, loans receivable and equity method investments, the valuation of derivative financial instruments, the valuation of compensation plans and the useful lives of long-lived assets. Actual results could differ materially from those estimates.
Fair value measurements	Fair Value Measurements. The Company follows the guidance in the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification Topic 820, Fair Value Measurements and Disclosures, as amended (“Topic 820”), to determine the fair value of financial and non-financial instruments. Topic 820 defines fair value, establishes a framework for measuring fair value in GAAP and expands disclosures about fair value measurements. Topic 820 establishes a fair value hierarchy that prioritizes observable and unobservable inputs used to measure fair value into three levels: Level 1 - quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities; Level 2 - observable prices that are based on inputs not quoted in active markets, but corroborated by market data; and Level 3 - unobservable inputs, which are used when little or no market data is available. The fair value hierarchy gives the highest priority to Level 1 inputs and the lowest priority to Level 3 inputs. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible, as well as considering counterparty credit risk. The Company has formally elected to apply the portfolio exception within Topic 820 with respect to measuring counterparty risk for all of its derivative transactions subject to master netting arrangements.
Acquisition, development and construction arrangements	Acquisition, Development and Construction Arrangements. The Company evaluates loans receivable where the Company participates in residual profits through loan provisions or other contracts to ascertain whether the Company has the same risks and rewards as an owner or a joint venture partner. Where the Company concludes that such arrangements are more appropriately treated as an investment in real estate, the Company reflects such loan receivable as an equity investment in real estate under construction in the unaudited condensed consolidated balance sheets. In these cases, no interest income is recorded on the loan receivable and the Company capitalizes interest during the construction period. In arrangements where the Company engages a developer to construct a property or provides funds to a tenant to develop a property, the Company will capitalize the funds provided to the developer/tenant and internal costs of interest and real estate taxes, if applicable, during the construction period.
Reclassifications	Reclassifications. Certain amounts included in the 2017 unaudited condensed consolidated financial statements have been reclassified to conform to the 2018 presentation.
Recently issued accounting guidance	New Accounting Standards Adopted in 2018. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which addresses how certain cash receipts and cash payments are presented and classified in the statement of cash flows. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which clarifies guidance on the classification and presentation of changes in restricted cash. Restricted cash balances are now included along with cash and cash equivalents as of the end of the period and beginning of period, respectively, in the Company's consolidated statement of cash flows for all periods presented. Restricted cash is comprised primarily of cash balances held in escrow by lenders. In addition, separate line items showing changes in restricted cash balances are now eliminated from the Company's consolidated statement of cash flows. These ASUs were effective for fiscal years beginning after December 15, 2017, including interim periods within those years. Entities must apply the guidance retrospectively to all periods presented but may apply it prospectively if retrospective application would be impracticable. The Company adopted these ASUs effective January 1, 2018 on a retrospective basis. The effect of the adoption resulted in a $33,978 increase in cash provided by investing activities and an increase in cash used in financing activities of $1,572 for the three months ended March 31, 2017. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which clarifies the definition of a business when evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The ASU was effective for reporting periods beginning after December 15, 2017. The Company expects that acquisitions of real estate or in-substance real estate will not meet the revised definition of a business and thus will be treated as asset acquisitions. Acquisition costs for those acquisitions that are not businesses will be capitalized rather than expensed. The Company adopted this guidance effective January 1, 2018 on a prospective basis. The Company's adoption of this guidance did not have a material impact on its consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), as subsequently amended, which amends the guidance for revenue recognition to eliminate the industry-specific revenue recognition guidance and replace it with a principle based approach for determining revenue recognition. The new guidance was effective for reporting periods beginning after December 15, 2017. The Company’s revenue-producing contracts are primarily leases that are not within the scope of this standard as leases are excluded from ASU 2014-09. The Company expects that it may be impacted in its recognition of non-lease revenue, non-lease components of revenue from lease agreements (upon adoption of ASU 2016-02) and the timing of its recognition of real estate sale transactions. Under ASU 2014-09, revenue recognition for real estate sales is largely based on the transfer of control and the buyer having the ability to direct the use of, or obtain substantially all of the remaining benefit from, the asset (which generally will occur on the closing date); the factor of continuing involvement is no longer a specific consideration for the timing of recognition. As a result, the Company generally expects that the new guidance may result in transactions qualifying as sales of real estate at an earlier date than under previous GAAP. The Company adopted ASU 2014-09 effective January 1, 2018 using the modified retrospective approach. As the majority of the Company’s revenue is from rental income related to leases, the adoption of the ASU did not have a material impact on its consolidated financial statements. In February 2017, the FASB issued ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Topic 610-20), which requires that all entities account for the derecognition of a business in accordance with ASC 810, including instances in which the business is considered in-substance real estate. The ASU requires the Company to measure at fair value any retained interest in a partial sale of real estate. The ASU was effective for annual periods, and interim periods therein, beginning after December 15, 2017. The Company adopted ASU 2017-05 effective January 1, 2018 using the modified retrospective approach. The Company's adoption of this guidance did not have a material impact on its consolidated financial statements. Recently Issued Accounting Guidance. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires lessees to recognize a right of use asset and related lease liability for those leases classified as operating leases at the commencement date that have lease terms of more than 12 months and amends certain lessor guidance. The Company expects the ASU to result in the recognition of a right-to-use asset and related liability to account for the Company's future obligations under its ground lease arrangements for which the Company is the lessee. From a lessor perspective, the Company expects that lease components will primarily be recognized on a straight-line basis over the lease term. ASU 2016-02 originally stated that companies would be required to bifurcate certain lease revenues between lease and non-lease components; however, the FASB issued an exposure draft in January 2018 (2018 Exposure Draft) which, if adopted as written, would allow lessors a practical expedient by class of underlying assets to account for lease and non-lease components as a single lease component if certain criteria are met. Additionally, ASU 2016-02 will require that the Company capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. ASU 2016-02 will be effective for fiscal years beginning after December 15, 2018, and interim periods within those years. ASU 2016-02 originally required a modified retrospective method of adoption; however, the 2018 Exposure Draft indicates that companies may be permitted to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The pronouncement allows some optional practical expedients. The Company expects to adopt this new guidance on January 1, 2019 and continues to evaluate the impact that this guidance will have on its consolidated financial statements. In August 2017, the FASB issued ASU-2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which amends the hedge accounting recognition and presentation requirements in Topic 815. The ASU is effective for reporting periods beginning after December 15, 2018. Early adoption is permitted. The Company is currently evaluating the impact of the adoption of the new guidance on its consolidated financial statements.
LCIF [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Basis of presentation and consolidation	Basis of Presentation and Consolidation. The Partnership's unaudited condensed consolidated financial statements are prepared on the accrual basis of accounting in accordance with GAAP. The financial statements reflect the accounts of the Partnership and its consolidated subsidiaries. The Partnership consolidates its wholly-owned subsidiaries, partnerships and joint ventures which it controls (i) through voting rights or similar rights or (ii) by means other than voting rights if the Partnership is the primary beneficiary of a variable interest entity (“VIE”). Entities that the Partnership does not control and entities that are VIEs in which the Partnership is not the primary beneficiary are accounted for under appropriate GAAP.
Earnings per unit	Earnings Per Unit. Net income (loss) per unit is computed by dividing net income (loss) by the weighted-average number of operating partnership units, or OP units, outstanding during the period. There are no potential dilutive securities.
Unit redemptions	Unit Redemptions. The Partnership's limited partner units that are issued and outstanding, other than those held by Lexington, are currently redeemable at certain times, only at the option of the holders, for shares of beneficial interests classified as common stock of Lexington, par value $0.0001 per share ("common shares"), on a one to approximately 1.13 basis, subject to future adjustments. These units are not mandatorily redeemable by the Partnership.
Allocation of overhead expenses	Allocation of Overhead Expenses. The Partnership does not pay a fee to the General Partner for the day-to-day management of the Partnership. Certain expenses incurred by the General Partner and its affiliates, including Lexington, such as corporate-level interest, amortization of deferred loan costs, payroll and general and administrative expenses are allocated to the Partnership and reimbursed to the General Partner in accordance with the Partnership's partnership agreement. The allocation is based upon gross rental revenues.
Distributions and allocations of income and loss	Distributions; Allocations of Income and Loss. As provided in the Partnership's partnership agreement, distributions and income and loss for financial reporting purposes are allocated to the partners based on their ownership of units. Special allocation rules included in the partnership agreement affect the allocation of taxable income and loss.
Use of estimates	Use of Estimates. The Partnership has made a number of significant estimates and assumptions to prepare these unaudited condensed consolidated financial statements in conformity with GAAP, including, among others, relating to the reporting of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses. These estimates and assumptions are based on management's best estimates and judgment. The Partnership evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors. The Partnership adjusts such estimates when facts and circumstances dictate. The most significant estimates made include the recoverability of accounts receivable, allocation of property purchase price to tangible and intangible assets acquired and liabilities assumed, the determination of VIEs and which entities should be consolidated, the determination of impairment of long-lived assets and equity method investments and the useful lives of long-lived assets. Actual results could differ materially from those estimates.
Fair value measurements	Fair Value Measurements. The Partnership follows the guidance in the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“Topic 820”), to determine the fair value of financial and non-financial instruments. Topic 820 defines fair value, establishes a framework for measuring fair value in GAAP and expands disclosures about fair value measurements. Topic 820 establishes a fair value hierarchy that prioritizes observable and unobservable inputs used to measure fair value into three levels: Level 1 - quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities; Level 2 - observable prices that are based on inputs not quoted in active markets, but corroborated by market data; and Level 3 - unobservable inputs, which are used when little or no market data is available. The fair value hierarchy gives the highest priority to Level 1 inputs and the lowest priority to Level 3 inputs. In determining fair value, the Partnership utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible, as well as considering counterparty credit risk.
Acquisition, development and construction arrangements	Acquisition, Development and Construction Arrangements. The Partnership evaluates loans receivable where the Partnership participates in residual profits through loan provisions or other contracts to ascertain whether the Partnership has the same risks and rewards as an owner or a joint venture partner. Where the Partnership concludes that such arrangements are more appropriately treated as an investment in real estate, the Partnership reflects such loan receivable as an equity investment in real estate under construction in the unaudited condensed consolidated balance sheets. In these cases, no interest income is recorded on the loan receivable and the Partnership records capitalized interest during the construction period. In arrangements where the Partnership engages a developer to construct a property or provide funds to a tenant to develop a property, the Partnership will capitalize the funds provided to the developer/tenant and internal costs of interest and real estate taxes, if applicable, during the construction period.
Co-borrower debt	Co-borrower Debt. The Partnership is subject to ASC 405-40, which requires recognition of such obligations as the sum of (a) the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and (b) any additional amount the reporting entity expects to pay on behalf of its co-obligors.
Reclassifications	Reclassifications. Certain amounts included in the 2017 unaudited condensed consolidated financial statements have been reclassified to conform to the 2018 presentation.
Recently issued accounting guidance	New Accounting Standards Adopted in 2018. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which addresses how certain cash receipts and cash payments are presented and classified in the statement of cash flows. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which clarifies guidance on the classification and presentation of changes in restricted cash. Restricted cash balances are now included along with cash and cash equivalents as of the end of the period and beginning of period, respectively, in the Partnership's consolidated statement of cash flows for all periods presented. Restricted cash is comprised primarily of cash balances held in escrows by lenders. In addition, separate line items showing changes in restricted cash balances are now eliminated from the Partnership's consolidated statement of cash flows. These ASUs were effective for fiscal years beginning after December 15, 2017, including interim periods within those years. Entities must apply the guidance retrospectively to all periods presented but may apply it prospectively if retrospective application would be impracticable. The Partnership adopted these ASUs effective January 1, 2018 on a retrospective basis. The Partnership's adoption of this guidance did not have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which clarifies the definition of a business when evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The ASU was effective for reporting periods beginning after December 15, 2017. The Partnership expects that acquisitions of real estate or in-substance real estate will not meet the revised definition of a business and thus will be treated as asset acquisitions. Acquisition costs for those acquisitions that are not businesses will be capitalized rather than expensed. The Partnership adopted this guidance effective January 1, 2018 on a prospective basis. The Partnership's adoption of this guidance did not have a material impact on its consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), as subsequently amended, which amends the guidance for revenue recognition to eliminate the industry-specific revenue recognition guidance and replace it with a principle based approach for determining revenue recognition. The new guidance was effective for reporting periods beginning after December 15, 2017. The Partnership’s revenue-producing contracts are primarily leases that are not within the scope of this standard as leases are excluded from ASU 2014-09. The Partnership expects that it may be impacted in its recognition of non-lease revenue, non-lease components of revenue from lease agreements (upon adoption of ASU 2016-02) and the timing of its recognition of real estate sale transactions. Under ASU 2014-09, revenue recognition for real estate sales is largely based on the transfer of control and the buyer having the ability to direct the use of, or obtain substantially all of the remaining benefit from, the asset (which generally will occur on the closing date); the factor of continuing involvement is no longer a specific consideration for the timing of recognition. As a result, the Partnership generally expects that the new guidance may result in transactions qualifying as sales of real estate at an earlier date than under previous GAAP. The Partnership adopted ASU 2014-09 effective January 1, 2018 using the modified retrospective approach. As the majority of the Partnership’s revenue is from rental income related to leases, the adoption of the ASU did not have a material impact on its consolidated financial statements. In February 2017, the FASB issued ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Topic 610-20), which requires that all entities account for the derecognition of a business in accordance with ASC 810, including instances in which the business is considered in-substance real estate. The ASU requires the Partnership to measure at fair value any retained interest in a partial sale of real estate. The ASU is effective for annual periods, and interim periods therein, beginning after December 15, 2017. The Partnership adopted ASU 2017-05 effective January 1, 2018 using the modified retrospective approach. The Partnership's adoption of this guidance did not have a material impact on its consolidated financial statements. Recently Issued Accounting Guidance. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires lessees to recognize a right of use asset and related lease liability for those leases classified as operating leases at the commencement date that have lease terms of more than 12 months and amends certain lessor guidance. The ASU is expected to result in the recognition of a right-to-use asset and related liability to account for the Partnership's future obligations under its ground lease arrangements for which the Partnership is the lessee. From a lessor perspective, the Partnership expects that lease components will primarily be recognized on a straight-line basis over the lease term. ASU 2016-02 originally stated that companies would be required to bifurcate certain lease revenues between lease and non-lease components, however, the FASB issued an exposure draft in January 2018 (2018 Exposure Draft) which, if adopted as written, would allow lessors a practical expedient by class of underlying assets to account for lease and non-lease components as a single lease component if certain criteria are met. Additionally, ASU 2016-02 will require that the Partnership capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. ASU 2016-02 will be effective for fiscal years beginning after December 15, 2018, and interim periods within those years. ASU 2016-02 originally required a modified retrospective method of adoption, however, the 2018 Exposure Draft indicates that companies may be permitted to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The pronouncement allows some optional practical expedients. The Partnership expects to adopt this new guidance on January 1, 2019 and continues to evaluate the impact that this guidance will have on its consolidated financial statements.