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

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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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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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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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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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Investments in Unconsolidated Joint Ventures (Liberty Illinois, LP) (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) a ft² bldg	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) ft² bldg
Schedule of Equity Method Investments [Line Items]
Number of buildings (in buildings) \| bldg	72
Management fee income	$ 73,224,000	$ 82,673,000	$ 12,941,000
Joint venture, 2016 sales current quarter \| Building and Building Improvements \| Liberty Illinois, LP \| Not Discontinued Operations
Schedule of Equity Method Investments [Line Items]
Number of buildings (in buildings) \| bldg			4
Leaseable square feet (in sqft) \| ft²			636,000
Proceeds from sale of property			$ 32,500,000
Gain (Loss) on Investments \| General Partner \| Joint venture, 2016 sales current quarter \| Building and Building Improvements \| Liberty Illinois, LP \| Not Discontinued Operations
Schedule of Equity Method Investments [Line Items]
Gains on sale of land and building			1,000,000.0
Chicago/Minneapolis \| Liberty Illinois, LP
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%
Chicago/Minneapolis \| Building and Building Improvements \| Liberty Illinois, LP
Schedule of Equity Method Investments [Line Items]
Leaseable square feet (in sqft) \| ft²	4,900,000
Chicago/Minneapolis \| Building and Building Improvements \| Industrial Property \| Liberty Illinois, LP
Schedule of Equity Method Investments [Line Items]
Number of buildings (in buildings) \| bldg	12
Chicago/Minneapolis \| Land and Land Improvements \| Liberty Illinois, LP
Schedule of Equity Method Investments [Line Items]
Acres of developable land (in acres) \| a	248.0
Liberty Illinois, LP \| Chicago/Minneapolis \| Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Management fee income	$ 900,000	900,000	$ 1,000,000.0
Prepaid Expenses and Other Current Assets \| Liberty Illinois, LP \| Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Due from related parties	$ 331,000	$ 5,000