Net Investments in Properties and Real Estate Under Construction (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Liabilities assumed at fair value:
Gain on change in control of interests	$ 0	$ 0	$ (49,922)	$ 0
Madison Storage NYC, LLC and Veritas Group IX-NYC, LLC
Investments In Real Estate
Cash consideration			11,363
Assets acquired at fair value:
Land	26,941		26,941
Buildings	109,399		109,399
In-place lease intangible assets	9,783		9,783
Other assets acquired	1,705		1,705
Total assets acquired	147,828		147,828
Liabilities assumed at fair value:
Non-recourse debt, net	(70,578)		(70,578)
Other liabilities assumed	(831)		(831)
Total liabilities assumed	(71,409)		(71,409)
Total identifiable net assets	76,419		76,419
Gain on change in control of interests			(49,922)
Carrying value of previously held equity investment	(15,134)		(15,134)
Total assets acquired less previously held equity investments	$ 11,363		$ 11,363