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Investments in Unconsolidated Real Estate Ventures - Equity Method Investments (Details)
$ in Thousands
Dec. 31, 2016
Dec. 01, 2016
USD ($)
store
Oct. 19, 2016
USD ($)
store
Sep. 14, 2016
USD ($)
store
Aug. 16, 2016
USD ($)
store
Jul. 08, 2016
USD ($)
store
May 20, 2016
USD ($)
store
Apr. 08, 2016
USD ($)
store
Mar. 31, 2016
USD ($)
store
Dec. 30, 2015
USD ($)
store
BH Ridgelake LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Initial Investment | $   $ 1,301                
Equity method ownership percentage   20.00%                
Number of operating stores owned | store   1                
ESS-GS Portland and Broadway LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Initial Investment | $     $ 1,250              
Equity method ownership percentage     25.00%              
Number of operating stores owned | store     1              
ESS-GS Vancouver-139th LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Initial Investment | $       $ 806            
Equity method ownership percentage       25.00%            
Number of operating stores owned | store       1            
ESS-H Elmont Associates LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Initial Investment | $         $ 4,712          
Equity method ownership percentage         50.00%          
Number of operating stores owned | store         1          
ESS-GS Hillsboro-73rd LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Initial Investment | $           $ 376        
Equity method ownership percentage           25.00%        
Number of operating stores owned | store           1        
BH Storage Columbia LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Initial Investment | $             $ 1,034      
Equity method ownership percentage             20.00%      
Number of operating stores owned | store             1      
PREXR {Member]                    
Schedule of Equity Method Investments [Line Items]                    
Initial Investment | $               $ 12,114    
Equity method ownership percentage 25.00%             25.00%    
Number of operating stores owned | store               1    
ESS H Baychaster Investments LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Initial Investment | $                 $ 4,794  
Equity method ownership percentage                 44.40%  
Number of operating stores owned | store                 1  
ESS H Bloomfield Investment LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Initial Investment | $                   $ 2,885
Equity method ownership percentage                   50.00%
Number of operating stores owned | store                   1