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Investment in Unconsolidated and Consolidated Joint Ventures - Investment Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($) a	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) a ft² joint_venture	Sep. 30, 2017 USD ($)	Dec. 31, 2013 USD ($) ft² member	Jun. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 27,660,000		$ 27,660,000				$ 30,031,000
Equity in earnings (loss)	1,592,000	$ 1,724,000	2,411,000	$ 3,512,000
Equity	27,660,000		27,660,000				30,031,000
Debt	119,014,000		119,014,000				114,273,000
Centennial
Schedule of Equity Method Investments [Line Items]
Noncontrolling interest balance	$ 11,039,000		$ 11,039,000
Consolidated joint venture, ownership interest	92.88%		92.88%
Petro Travel Plaza Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Unconsolidated joint ventures, ownership interest	50.00%		50.00%
Right and share of profit and loss	60.00%		60.00%
Equity	$ 16,447,000		$ 16,447,000				17,422,000
Debt	15,282,000		15,282,000				15,280,000
Majestic Realty Co.
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 24,773,000		$ 24,773,000
Unconsolidated joint ventures, ownership interest	50.00%		50.00%
Number of joint venture contracts \| joint_venture			2
Investment in unconsolidated joint ventures	$ 2,356,000		$ 2,356,000
Area of building owned and leased \| ft²			651,909
TRC-MRC 2, LLC
Schedule of Equity Method Investments [Line Items]
Equity	0		$ 0				0
Debt instrument face amount						$ 25,240,000
Debt	25,150,000		25,150,000				21,080,000
Deficit balance	2,139,888		$ 2,139,888
TRCC-East
Schedule of Equity Method Investments [Line Items]
Area of building owned and leased \| ft²			480,480
Deficit balance	216,000		$ 216,000
Number of acres for development \| ft²					326,000
TRC-MRC 1, LLC
Schedule of Equity Method Investments [Line Items]
Equity	0		0				0
Debt	21,963,000		21,963,000				19,433,000
Construction Loan	25,000,000		$ 25,000,000
Rockefeller Joint Ventures
Schedule of Equity Method Investments [Line Items]
Number of joint venture contracts \| joint_venture			3
Investment in unconsolidated joint ventures	$ 11,213,000		$ 11,213,000
Number of acres for development \| a			91
Development of land in TRCC including pursuing foreign trade zone (up to) \| a	500		500
Rockefeller Joint Ventures \| Building Development
Schedule of Equity Method Investments [Line Items]
Number of joint venture contracts \| joint_venture			2
Five West Parcel, LLC
Schedule of Equity Method Investments [Line Items]
Unconsolidated joint ventures, ownership interest	50.00%		50.00%
Equity	$ 3,100,000		$ 3,100,000				2,802,000
Area of building owned and leased \| ft²			606,000
Debt	9,307,000		$ 9,307,000				9,711,000
18-19 West, LLC
Schedule of Equity Method Investments [Line Items]
Equity	1,744,000		1,744,000				1,782,000
Debt	0		$ 0				0
Number of acres for development \| a			61.5
TRCC/Rock Outlet Center, LLC
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures					$ 87,000,000
Equity	6,369,000		$ 6,369,000				8,025,000
Debt	47,312,000		47,312,000				$ 48,769,000
Construction loan percent of costs					60.00%
Equity contributions, percent					40.00%
Number of members \| member					2
TRCC/Rock Outlet Center, LLC \| Line of Credit
Schedule of Equity Method Investments [Line Items]
Summarized financial information, maximum borrowing capacity	$ 52,000,000		$ 52,000,000