Investment in Unconsolidated and Consolidated Joint Ventures - Investment Information (Details) (USD $)	3 Months Ended		9 Months Ended				9 Months Ended			9 Months Ended			9 Months Ended		9 Months Ended			9 Months Ended			3 Months Ended		9 Months Ended			9 Months Ended			0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 joint_venture	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Line of Credit	Sep. 30, 2014 Petro Travel Plaza Holdings LLC	Sep. 30, 2013 Petro Travel Plaza Holdings LLC	Dec. 31, 2013 Petro Travel Plaza Holdings LLC	Sep. 30, 2014 Tejon Mountain Village LLC	Sep. 30, 2013 Tejon Mountain Village LLC	Dec. 31, 2013 Tejon Mountain Village LLC	Sep. 30, 2014 Rockefeller Joint Ventures acre joint_venture	Sep. 30, 2013 Rockefeller Joint Ventures	Sep. 30, 2014 Five West Parcel LLC sqft	Sep. 30, 2013 Five West Parcel LLC	Dec. 31, 2013 Five West Parcel LLC	Sep. 30, 2014 18-19 West LLC acre	Sep. 30, 2013 18-19 West LLC	Dec. 31, 2013 18-19 West LLC	Sep. 30, 2013 TRCC-East [Member] acre	Jun. 30, 2012 TRCC-East [Member]	Sep. 30, 2014 TRCC/Rock Outlet Center	Sep. 30, 2013 TRCC/Rock Outlet Center	Dec. 31, 2013 TRCC/Rock Outlet Center	Sep. 30, 2014 Centennial Founders, LLC	Sep. 30, 2013 Centennial Founders, LLC	Dec. 31, 2013 Centennial Founders, LLC	Jul. 15, 2014 TMV LLC	Oct. 20, 2014 Subsequent Event TMV LLC	Oct. 07, 2014 Subsequent Event TMV LLC
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 30,580,000		$ 30,580,000		$ 62,604,000									$ 335,000							$ 87,000,000			$ 0
Equity in earnings (losses)	1,707,000	1,241,000	3,293,000	2,920,000			3,052,000	2,709,000		(35,000)	(52,000)				54,000	51,000		13,000	21,000				209,000	191,000		0	0
Unconsolidated joint ventures, ownership interest							60.00%								50.00%			50.00%
Unconsolidated joint ventures, voting rights							50.00%
Number of joint venture contracts			3										2
Number of acres for development													91								326,000
Development of land in TRCC including pursuing Foreign Trade Zone													500
Consolidated joint venture, ownership interest																										73.87%
Area of building owned and leased															606,000
Long-term Debt	(84,718,000)		(84,718,000)		(4,693,000)		(16,022,000)		(16,602,000)			0			(11,000,000)		(11,000,000)	0		0			(39,492,000)		0	0		0
Number of acres for development																		61.5
Investment in unconsolidated joint ventures							14,565,000						16,015,000											10,558,000
Payments to Acquire Interest in Subsidiaries and Affiliates													8,500,000
Equity Method Investment, Aggregate Cost																						2,159,000
Line of Credit Facility, Maximum Borrowing Capacity						52,000,000
Payments to Acquire Businesses, Gross																													10,000,000	59,000,000
Business Acquisition, Percentage of Voting Interests Acquired																													100.00%
Business Combination, Consideration Transferred, Liabilities Incurred																													60,000,000
Business Combination, Consideration Transferred, Liability, Due Date Extension Payment																															$ 1,000,000