Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Jan. 31, 2018
LCIF [Member]
Related Party Transaction [Line Items]
General and administrative expense	$ 1,744	$ 1,418
Property operating expenses	156	170
Lexington Realty Trust [Member] | LCIF [Member]
Related Party Transaction [Line Items]
Maximum amount to be distributed from (to) related party	(2,476)		$ (2,422)
Unit distributions earned	14,340	16,287
Interest expense	2,369	$ 1,811
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Notes payable, related party			8,000	$ 500
Notes payable, related party, potential maximum amount			12,000
Affiliated Entity [Member] | LCIF [Member]
Related Party Transaction [Line Items]
Notes payable, related party	$ 500		8,000
Notes payable, related party, potential maximum amount			12,000
Expense Reimbursement [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Property operating expenses			105
Expense Reimbursement [Member] | Affiliated Entity [Member] | LCIF [Member]
Related Party Transaction [Line Items]
Property operating expenses			105
Structuring Fee [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Property operating expenses			128
Structuring Fee [Member] | Affiliated Entity [Member] | LCIF [Member]
Related Party Transaction [Line Items]
Property operating expenses			$ 128