Investment in Unconsolidated and Consolidated Joint Ventures - Investment Information (Details)	1 Months Ended	3 Months Ended			12 Months Ended
	Nov. 30, 2018 ft²	Dec. 31, 2019	Mar. 31, 2019 USD ($) a ft² joint_venture	Mar. 31, 2018 USD ($)	Dec. 31, 2013 USD ($) ft² member	Dec. 31, 2018 USD ($)	Jun. 01, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures			$ 29,503,000			$ 28,602,000
Equity in earnings (loss)			876,000	$ 167,000
Equity			29,503,000			28,602,000
Debt			120,483,000			121,326,000
Centennial
Schedule of Equity Method Investments [Line Items]
Noncontrolling interest balance			$ 11,039,000			13,172,000
Consolidated joint venture, ownership interest			92.32%
Petro Travel Plaza Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Unconsolidated joint ventures, ownership interest			50.00%
Right and share of profit and loss			60.00%
Equity			$ 19,548,000			18,426,000
Debt			15,284,000			15,283,000
Majestic Realty Co.
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures			$ 24,773,000
Area of building owned and leased | ft²			651,909
TRC-MRC 3, LLC
Schedule of Equity Method Investments [Line Items]
Equity			$ 100,000			0
Number of acres for development | ft²	579,040
Debt			0			0
TRC-MRC 3, LLC | Scenario, Forecast
Schedule of Equity Method Investments [Line Items]
Joint Venture, Percentage of Rentable Space Occupied		67.00%
TRC-MRC 2, LLC
Schedule of Equity Method Investments [Line Items]
Equity			0			0
Debt instrument face amount							$ 25,240,000
Debt			24,877,000			25,014,000
Deficit balance			$ 2,482,000
TRCC-East
Schedule of Equity Method Investments [Line Items]
Number of acres for development | ft²					326,000
Area of building owned and leased | ft²			480,480
Deficit balance			$ 275,000
TRC-MRC 1, LLC
Schedule of Equity Method Investments [Line Items]
Equity			0			0
Debt			24,943,000			25,030,000
Construction Loan			$ 25,030,000
Rockefeller Joint Ventures
Schedule of Equity Method Investments [Line Items]
Number of joint venture contracts | joint_venture			3
Investment in unconsolidated joint ventures			$ 9,855,000
Number of acres for development | a			91
Development of land in TRCC including pursuing foreign trade zone (up to) | a			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			$ 2,777,000			2,691,000
Area of building owned and leased | ft²			606,000
Debt			$ 9,038,000			9,173,000
18-19 West, LLC
Schedule of Equity Method Investments [Line Items]
Equity			1,769,000			1,783,000
Debt			$ 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			$ 5,309,000			5,702,000
Debt			46,341,000			$ 46,826,000
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