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Area of land held.

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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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Net rentable area for properties owned.

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

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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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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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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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No definition available.

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Investments in Unconsolidated Joint Ventures (Liberty Venture I, LP) (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) ft² properties	Dec. 31, 2015 USD ($) a properties	Dec. 31, 2014 USD ($) a ft² properties
Schedule of Equity Method Investments [Line Items]
Gross proceeds	$ 1,192,918	$ 530,440	$ 559,322
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
Building and Building Improvements [Member] \| New Jersey [Member] \| Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Leaseable square feet \| a		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
Anticipated aggregate investment	$ 20,500
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 \| properties		1
Equity Method Investee [Member] \| Liberty Venture I, LP [Member] \| New Jersey [Member]
Schedule of Equity Method Investments [Line Items]
Management fees revenue	$ 2,300	$ 1,600	$ 1,400
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	$ 250	$ 451
Joint venture acquisitions, 2014 [Member] \| General Partner [Member] \| Purchase from liberty property limited partnership [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			3
Leaseable square feet \| ft²			603
Purchases from related party			$ 43,000
Revenue from related parties			$ 2,500
Joint venture acquisitions, 2014 [Member] \| General Partner [Member] \| Purchase from liberty property limited partnership [Member] \| Land and Land Improvements [Member] \| New Jersey [Member] \| Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Acres of developable land \| a			51