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Investments in Unconsolidated Real Estate Ventures - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 16, 2016
USD ($)
store
Dec. 31, 2017
USD ($)
store
Dec. 31, 2017
USD ($)
Dec. 31, 2016
Apr. 01, 2016
Mar. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]              
Number of acquired stores | store   7          
Equity method ownership percentage   25.00% 25.00%       50.00%
Amortization amount of excess purchase price included in equity earnings   $ 27,691 $ 27,691        
Amortization period of excess purchase price included in equity earnings     40 years        
ESS PRISA II LLC Joint Venture              
Schedule of Equity Method Investments [Line Items]              
Number of acquired stores | store 23            
Ownership percentage sold 4.42%            
Amount sold $ 3,912            
Realized gain (loss) on disposal $ 30,846            
Equity method ownership percentage 4.40%            
ESS PRISA LLC and ESS PRISA TWO LLC              
Schedule of Equity Method Investments [Line Items]              
Unconsolidated joint ventures excess profit participation percentage forfeited         17.00%    
ESS PRISA LLC              
Schedule of Equity Method Investments [Line Items]              
Equity method ownership percentage         4.00% 2.00%  
ESS Prisa Two LLC              
Schedule of Equity Method Investments [Line Items]              
Equity method ownership percentage         4.40% 2.00%  
Minimum              
Schedule of Equity Method Investments [Line Items]              
Equity method ownership percentage   10.00% 10.00% 20.00%      
Maximum              
Schedule of Equity Method Investments [Line Items]              
Equity method ownership percentage       50.00%      
Prudential Real Estate and Affiliates | ESS PRISA II LLC Joint Venture              
Schedule of Equity Method Investments [Line Items]              
Proceeds from sale of equity method investments $ 34,758