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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- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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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 Illinois, LP) (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) ft² a bldg properties	Dec. 31, 2016 USD ($) ft² bldg	Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of properties \| bldg	37
Acres of developable land \| a	9
Gain (loss) on sale of properties	$ 114,965	$ 219,270	$ 100,314
Joint venture, 2016 sales current quarter [Member] \| Building and Building Improvements [Member] \| Liberty Illinois, LP [Member] \| Not Discontinued Operations [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties \| bldg		4
Leaseable square feet \| ft²		636
Proceeds from sale of property		$ 32,500
Gain (Loss) on Investments [Member] \| General Partner [Member] \| Joint venture, 2016 sales current quarter [Member] \| Building and Building Improvements [Member] \| Liberty Illinois, LP [Member] \| Not Discontinued Operations [Member]
Schedule of Equity Method Investments [Line Items]
Gains on sale of land and building		1,000
Chicago Minneapolis [Member] \| Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%
Chicago Minneapolis [Member] \| Building and Building Improvements [Member] \| Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Leaseable square feet \| ft²	4,900
Chicago Minneapolis [Member] \| Building and Building Improvements [Member] \| Industrial Property [Member] \| Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties \| properties	12
Chicago Minneapolis [Member] \| Land and Land Improvements [Member] \| Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Acres of developable land \| a	248
Liberty Illinois, LP [Member] \| Chicago Minneapolis [Member] \| Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Management fees revenue	$ 900	1,000	$ 1,300
Prepaid Expenses and Other Current Assets [Member] \| Liberty Illinois, LP [Member] \| Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Due from related parties	$ 5	$ 132