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Selected Quarterly Financial Data (Unaudited) - Narratives (Details)
3 Months Ended 12 Months Ended
Oct. 26, 2016
Apr. 11, 2016
property
Dec. 31, 2017
USD ($)
property
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
property
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition                          
Impairment charges               $ 29,200,000          
(Loss) gain on change in control of interests                     $ (13,851,000) $ 49,922,000 $ 0
Number of real estate properties | property     411               411    
Gain on sale of real estate, net of tax                     $ 2,879,000 132,858,000 2,197,000
Loss on extinguishment of debt             $ 800,000 16,000,000 $ 5,100,000 $ 2,500,000 1,922,000 $ 24,376,000 275,000
Goodwill impairment     $ 0                    
Self storage | Madison Storage NYC, LLC and Veritas Group IX-NYC, LLC                          
Business Acquisition                          
(Loss) gain on change in control of interests                 49,900,000        
Increase in ownership equity investments 40.00% 15.00%                   15.00%  
Number of real estate properties | property   5                      
Gain on sale of real estate, net of tax               $ 82,300,000 $ 25,000,000 $ 25,400,000      
All Other | Shelborne Property Associates, LLC | Third Party                          
Business Acquisition                          
Goodwill impairment             22,800,000            
Contract termination income             10,600,000            
Guaranteed loss compensation             $ 10,600,000            
Level 3 | Nonrecurring                          
Business Acquisition                          
Impairment charges                     19,535,000 $ 31,625,000 1,023,000
Real estate | Level 3 | Nonrecurring                          
Business Acquisition                          
Impairment charges     $ 4,200,000               8,276,000 29,183,000 0
Equity Method Investments | Level 3 | Nonrecurring                          
Business Acquisition                          
Impairment charges       $ 6,300,000 $ 2,500,000           10,576,000 1,919,000 $ 0
Equity Method Investments | Level 3 | Nonrecurring | Agrokor                          
Business Acquisition                          
Impairment charges           $ 1,800,000         $ 4,281,000 $ 1,919,000