Schedule III - Real Estate and Accumulated Depreciation (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Accumulated Depreciation		$ (7,160)	$ (14,023)	$ (23,584)	$ (30,627)
Net Liquidation Adjustment		(12,442)
Total		40,136	$ 200,675	$ 377,446	$ 587,952
Office [Member] | Plantation [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances		10,091
Initial Cost to Company, Building and Improvements		8,915
Land		4,000
Building and Improvements		8,935
Accumulated Depreciation	[1]	(2,169)
Total		$ 10,766
Date Acquired		2004-11
Life		40 years
Office [Member] | Lisle [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances		$ 5,216
Initial Cost to Company, Land		780
Initial Cost to Company, Building and Improvements		2,803
Land		780
Building and Improvements		3,521
Accumulated Depreciation	[1]	(690)
Total		$ 3,611
Date Acquired		2006-02
Life		40 years
Other [Member] | Churchill [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances		$ 4,356
Initial Cost to Company, Building and Improvements		23,834
Building and Improvements		11,705
Accumulated Depreciation	[1]	(4,301)
Total		$ 7,404
Date Acquired		2004-11
Life		40 years
Net Liquidation Adjustment [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Net Liquidation Adjustment	[2]	$ 11,195
Total	[2]	11,195
Liquidation Value [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances		19,663
Initial Cost to Company, Land		780
Initial Cost to Company, Building and Improvements		35,552
Land		4,780
Building and Improvements		24,161
Accumulated Depreciation	[1]	(7,160)
Net Liquidation Adjustment	[2]	11,195
Total		$ 32,976

[1] Depreciation expense will not be recorded subsequent to July 31, 2014 as a result of the adoption of our plan of liquidation.

[2] Under the liquidation basis of accounting, our real estate holding are now carried at their estimated value, as a result the net liquidation adjustment is the net adjustment that we have made to the carrying value of the property in order to reflect its fair value.