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Property Acquisitions and Dispositions - Narrative (Details)
shares in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2017
USD ($)
store
Sep. 13, 2017
USD ($)
Jul. 26, 2016
USD ($)
Apr. 20, 2016
USD ($)
store
Apr. 01, 2016
USD ($)
shares
Dec. 31, 2014
USD ($)
store
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Nov. 17, 2016
Dec. 31, 2011
USD ($)
Property Acquisitions [Line Items]                      
Equity method ownership percentage             25.00%   50.00%    
Proceeds from sale of real estate assets, investments in real estate ventures and other assets             $ 312,165,000 $ 60,813,000 $ 800,000    
Impairment loss             $ 6,100,000        
New Jersey and Virginia, 5 Stores Acquired in 2014                      
Property Acquisitions [Line Items]                      
Number of operating stores acquired | store           5          
Increase in payments due to sellers               $ 4,284,000      
Florida, Stores Acquired in 2011                      
Property Acquisitions [Line Items]                      
Amount due to sellers resulting from higher rental income of properties           $ 2,500,000         $ 133,000
Gain (loss) on earnout consideration                 $ 400,000    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Disposal of New York Land, September 13, 2017                      
Property Acquisitions [Line Items]                      
Proceeds from sale of real estate assets, investments in real estate ventures and other assets   $ 19,000,000                  
Impairment loss   $ 3,500,000                  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Disposal Of Indiana Store, July 26,2016                      
Property Acquisitions [Line Items]                      
Proceeds from sale of real estate assets, investments in real estate ventures and other assets     $ 4,447,000                
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Disposal of Indiana Stores, July 26, 2016                      
Property Acquisitions [Line Items]                      
Gain (loss) on disposition of assets     $ 0                
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Disposal of Ohio and Indiana Stores, April 20, 2016                      
Property Acquisitions [Line Items]                      
Proceeds from sale of real estate assets, investments in real estate ventures and other assets       $ 17,555,000              
Gain (loss) on disposition of assets       $ 11,265,000              
Number of stores sold | store 36     7              
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Disposal of 36 Stores Located in Various States                      
Property Acquisitions [Line Items]                      
Proceeds from sale of real estate assets, investments in real estate ventures and other assets $ 295,000,000                    
Percentage of gain deferred on disposition 10.00%                    
Gain (loss) on disposition of assets $ 118,776,000                    
Percentage of gain received on disposition 90.00%                    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Disposal of Texas Store, April 1, 2016                      
Property Acquisitions [Line Items]                      
Gain (loss) on disposition of assets         $ 93,000            
Partner capital units (in shares) | shares         85            
Consideration         $ 7,689,000            
ESS WCOT LLC Joint Venture                      
Property Acquisitions [Line Items]                      
Equity method ownership percentage                   5.00%  
PRISA                      
Property Acquisitions [Line Items]                      
Equity method ownership percentage             10.00%