Investment in Real Estate - Summary Regarding Industrial Properties Included in Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Real Estate [Abstract]
Total Revenues		$ 1,560		$ 6,316
Property Expenses		(652)		(2,444)
Depreciation and Amortization		(404)		(2,230)
Gain on Sale of Real Estate	$ 0	13,428	$ 0	14,483
Income from Discontinued Operations	$ 0	$ 13,932	$ 0	$ 16,125