Net Investments in Properties and Real Estate Under Construction - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 11, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Liabilities assumed at fair value:        
Gain on change in control of interests   $ (49,922) $ 0 $ 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      
Building 109,399      
In-place lease intangible assets 9,783      
Other assets acquired 1,705      
Assets acquired 147,828      
Liabilities assumed at fair value:        
Non-recourse debt, net (70,578)      
Other liabilities assumed (831)      
Liabilities Assumed (71,409)      
Total identifiable net assets 76,419      
Gain on change in control of interests (49,922)      
Carrying value of previously held equity investment (15,134)      
Net Assets Assumed $ 11,363