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Area of land held.

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No definition available.

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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Net rentable area for properties owned.

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No definition available.

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The number of real estate properties owned as of the balance sheet date.

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No definition available.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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- Definition

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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No definition available.

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Investments in Unconsolidated Joint Ventures (Liberty Venture I, LP) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) ft² a bldg properties	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) ft² bldg
Schedule of Equity Method Investments [Line Items]
Number of properties \| bldg	37
Gross proceeds	$ 379,139	$ 1,192,918	$ 530,440
Acres of developable land \| a	9
New Jersey [Member] \| Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%
Leaseable square feet \| ft²	4,500,000
Building and Building Improvements [Member] \| New Jersey [Member] \| Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Leaseable square feet \| ft²			198,000
Gross proceeds			$ 8,500
Construction in Progress [Member] \| New Jersey [Member] \| Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties \| properties	1
Leaseable square feet \| ft²	302,000
Anticipated aggregate investment	$ 21,100
Industrial Property [Member] \| Building and Building Improvements [Member] \| New Jersey [Member] \| Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties \| properties	28
Joint venture sales, 2015 [Member] \| Building and Building Improvements [Member] \| New Jersey [Member] \| Liberty Venture I, LP [Member] \| Not Discontinued Operations [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties \| bldg			1
Equity Method Investee [Member] \| Liberty Venture I, LP [Member] \| New Jersey [Member]
Schedule of Equity Method Investments [Line Items]
Management fees revenue	$ 1,600	2,300	$ 1,600
Prepaid Expenses and Other Current Assets [Member] \| Equity Method Investee [Member] \| Liberty Venture I, LP [Member] \| New Jersey [Member]
Schedule of Equity Method Investments [Line Items]
Due from related parties	$ 223	$ 250