Investment in Unconsolidated and Consolidated Joint Ventures - Investment Information (Details)				1 Months Ended					3 Months Ended				6 Months Ended		12 Months Ended
		Apr. 17, 2020 USD ($)	Apr. 01, 2019 USD ($)	Nov. 30, 2019 USD ($)	Apr. 30, 2019 USD ($) ft²	Nov. 30, 2018 ft²	Sep. 30, 2016	Aug. 31, 2009 a	Jun. 30, 2020 USD ($) a	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2013 USD ($) member	Jun. 30, 2020 USD ($) a ft² joint_venture	Jun. 30, 2019 USD ($)	Dec. 31, 2013 ft²	Jun. 01, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures									$ 41,246,000	$ 38,240,000			$ 41,246,000
Equity in earnings (loss)									$ 1,181,000		$ 1,971,000		2,536,000	$ 2,847,000
Value of property contributed	[1]												$ 0	$ 5,854,000
Centennial
Schedule of Equity Method Investments [Line Items]
Consolidated joint venture, ownership interest									92.67%				92.67%
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%
Petro Travel Plaza Holdings, LLC | Building and Land
Schedule of Equity Method Investments [Line Items]
Value of property contributed		$ 2,000,000
Gain realized on sale		$ 1,333,000
Majestic Realty Co.
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures									$ 24,773,000				$ 24,773,000
Number of joint venture contracts | joint_venture													3
Area of building owned and leased | ft²													651,909
TRC-MRC 3, LLC
Schedule of Equity Method Investments [Line Items]
Number of acres for development | ft²					579,040	579,040
Lease agreement, rentable space										100.00%
TRC-MRC 3, LLC | Land
Schedule of Equity Method Investments [Line Items]
Value of property contributed			$ 5,854,000		$ 5,900,000
TRC-MRC 2, LLC
Schedule of Equity Method Investments [Line Items]
Debt instrument face amount																$ 25,240,000
Deficit balance									2,210,000				$ 2,210,000
TRCC-East
Schedule of Equity Method Investments [Line Items]
Number of acres for development | ft²															326,000
Lease agreement, rentable space							100.00%
Area of building owned and leased | ft²													480,480
Deficit balance									474,000				$ 474,000
TRC-MRC 1, LLC
Schedule of Equity Method Investments [Line Items]
Construction Loan									25,030,000				25,030,000
Rockefeller Joint Ventures
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures									$ 8,547,000				$ 8,547,000
Number of joint venture contracts | joint_venture													3
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%		50.00%
Gain realized on sale				$ 17,537,000
Area of building owned and leased | ft²													606,000
Purchase price				$ 29,088,000
18-19 West, LLC
Schedule of Equity Method Investments [Line Items]
Number of acres for development | a								61.5
Option period purchase price									$ 13,800,000				$ 13,800,000
Purchase price, increase amount									$ 15,200,000				$ 15,200,000
TRCC/Rock Outlet Center, LLC
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures												$ 87,000,000
Construction loan percent of costs												60.00%
Equity contributions												40.00%
Number of members | member												2

[1] In April 2019, the Company contributed land with a fair value of $5.9 million to TRC-MRC 3, LLC an unconsolidated joint venture formed to pursue the development, construction, leasing, and management of a 579,040 square foot industrial building on the Company's property at TRCC-East. The total cost of the land, inclusive of transaction costs was $2.9 million. The Company recognized $1.5 million in profit and deferred $1.5 million after applying the five-step revenue recognition model in accordance with Accounting Standards Codification (ASC) Topic 606 — Revenue From Contracts With Customers and ASC Topic 323, Investments — Equity Method and Joint Ventures. Historically, cash outflows related to land development expenditures were accounted for within investing activities. For consistency, the Company will continue to classify cash outflows and cash inflows related to land development as investing activities.