Real Estate Assets (Details) (USD $)	3 Months Ended		9 Months Ended			0 Months Ended	9 Months Ended											9 Months Ended			9 Months Ended				9 Months Ended			9 Months Ended
	Sep. 01, 2012	Aug. 27, 2011	Sep. 01, 2012	Aug. 27, 2011	Dec. 03, 2011	Jul. 06, 2012 Tradeport	Sep. 01, 2012 Tradeport	Sep. 01, 2012 Imperial's Florida farm	Dec. 03, 2011 Imperial's Florida farm	Sep. 01, 2012 Held for Sale	Dec. 03, 2011 Held for Sale	Sep. 01, 2012 Land	Dec. 03, 2011 Land	Sep. 01, 2012 Land Held for Sale	Dec. 03, 2011 Land Held for Sale	Sep. 01, 2012 Land improvements	Dec. 03, 2011 Land improvements	Sep. 01, 2012 Land improvements Minimum	Sep. 01, 2012 Land improvements Maximum	Dec. 03, 2011 Land improvements Held for Sale	Sep. 01, 2012 Land improvements Held for Sale Minimum	Sep. 01, 2012 Land improvements Held for Sale Maximum	Sep. 01, 2012 Buildings and improvements	Dec. 03, 2011 Buildings and improvements	Sep. 01, 2012 Buildings and improvements Minimum	Sep. 01, 2012 Buildings and improvements Maximum	Dec. 03, 2011 Buildings and improvements Held for Sale	Sep. 01, 2012 Buildings and improvements Held for Sale Minimum	Sep. 01, 2012 Buildings and improvements Held for Sale Maximum	Sep. 01, 2012 Tenant improvements	Dec. 03, 2011 Tenant improvements	Sep. 01, 2012 Development costs	Dec. 03, 2011 Development costs	Sep. 01, 2012 Development costs Held for Sale	Dec. 03, 2011 Development costs Held for Sale
Real estate assets
Estimated Useful Lives																		10 years	30 years		10 years	30 years			10 years	40 years		10 years	40 years
Real estate assets, gross	$ 179,713,000		$ 179,713,000		$ 168,160,000					$ 1,326,000	$ 14,921,000	$ 10,267,000	$ 10,435,000	$ 61,000	$ 1,911,000	$ 14,069,000	$ 14,037,000			$ 4,000			$ 117,432,000	$ 117,120,000			$ 11,855,000			$ 14,591,000	$ 14,104,000	$ 23,354,000	$ 12,464,000	$ 1,265,000	$ 1,151,000
Accumulated depreciation	(55,572,000)		(55,572,000)		(51,865,000)						(1,932,000)
Real estate assets, net	124,141,000		124,141,000		116,295,000			1,973,000	2,161,000	1,326,000	12,989,000
Depreciation expense	1,269,000	1,307,000	3,839,000	3,983,000
Capitalized interest	227,000		596,000
Area of land sold (in acres)						93
Cash proceeds from sale of property						7,000,000
Funds Held in Escrow for Acquisition of Replacement Property							6,929,000
Total costs incurred related to sale of land (as a percent)							77.00%
Revenue from sale of land recognized, based on the percentage of total cost incurred							5,360,000
Pretax gain from sale of land recognized							4,624,000
Deferred revenue related to sale of land							1,640,000
Estimated pretax gain on sale that would be recognized after incurring total costs and recognizing total revenue							$ 6,000,000