Related Party Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Rent revenue	$ 359,832	$ 398,065	$ 399,485
Vorando Realty Trust [Member]
Related Party Transaction [Line Items]
Rent revenue	234	236	255
Rent expense for corporate headquarters	$ 1,179	1,176	1,323
LCIF [Member]
Related Party Transaction [Line Items]
Redemption of units (in units)	2,675,785
Redemption of units	$ 129,990
Expenses from transactions with related party	672	764	905
Rent revenue	74,707	115,403	117,847
Rent expense for corporate headquarters	171	286	307
General and administration expense	6,557	9,767	$ 8,618
LCIF [Member] \| General Partner [Member]
Related Party Transaction [Line Items]
Issuance of units (in units)			12,559,130
Issuance of units			$ 112,286
LCIF [Member] \| Lexington Realty Trust [Member]
Related Party Transaction [Line Items]
Due from (to) related party	(2,422)	5,967
Unit distributions earned	$ 61,072	64,319	58,361
Redemption of units (in units)	2,675,785
Distribution amount (usd per share)	$ 3.25
Redemption of units	$ 129,990
Interest expense, related party	8,237	11,392	$ 12,253
LCIF [Member] \| Lexington Realty Trust [Member] \| General Partner [Member]
Related Party Transaction [Line Items]
Issuance of units (in units)			12,559,130
Issuance of units			$ 112,286
LCIF [Member] \| Vorando Realty Trust [Member]
Related Party Transaction [Line Items]
Rent revenue	234	$ 236	$ 255
LCIF [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Notes payable, related parties	8,000
Notes payable, related parties, potential maximum amount	12,000
LCIF [Member] \| Affiliated Entity [Member] \| Expense Reimbursement [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	105
LCIF [Member] \| Affiliated Entity [Member] \| Structuring Fee [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 120

Distribution Made to Limited Partner and General Partner, Cash Distributions Earned

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Notes Payable, Related Parties, Potential Maximum Amount

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Amount of interest expense incurred on a debt or other obligation to related party.

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The amount for notes payable (written promise to pay), due to related parties.

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Monetary value of the issuance of new units of limited partnership interest in a private placement.

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Total change in each class of partners' capital accounts during the year due to redemptions and adjustments to redemption value. All partners include general, limited and preferred partners.

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The number of units redeemed during the year of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

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Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners.

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Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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