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Investments in Unconsolidated Real Estate Ventures - (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 16, 2016
USD ($)
store
Mar. 31, 2015
USD ($)
May 31, 2014
store
Dec. 31, 2013
store
JointVenture
Dec. 31, 2016
USD ($)
store
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Apr. 01, 2016
Schedule of Equity Method Investments [Line Items]                
Number of stores acquired | store         66      
Amortization amount of excess purchase price included in equity earnings         $ 26,806      
Amortization period of excess purchase price included in equity earnings         40 years      
Gain on sale of real estate   $ 60,495     $ 0 $ 60,495 $ 0  
Grupe Acquisition [Member]                
Schedule of Equity Method Investments [Line Items]                
Number of stores acquired | store     12 12        
Number of self-storage facilities (Stores) acquired | store     6          
Non-cash gain             3,438  
Cash gain on sale of investment in joint venture             $ 584  
Number of joint ventures | JointVenture       5        
ESS PRISA II LLC Joint Venture [Member]                
Schedule of Equity Method Investments [Line Items]                
Number of acquired stores | store 23              
Ownership percentage sold 4.42%              
Proceeds from sale of equity method investments $ 34,758              
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 [Member]                
Schedule of Equity Method Investments [Line Items]                
Unconsolidated joint ventures excess profit participation percentage forfeited               17.00%
ESS PRISA LLC [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity method ownership percentage   2.00%           4.00%
ESS Prisa Two LLC [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity method ownership percentage   2.00%           4.40%
Minimum [Member] | Grupe Acquisition [Member]                
Schedule of Equity Method Investments [Line Items]                
Additional interest acquired in the venture     60.00%          
Equity ownership prior to the acquisition     35.00%          
Maximum [Member] | Grupe Acquisition [Member]                
Schedule of Equity Method Investments [Line Items]                
Additional interest acquired in the venture     65.00%          
Equity ownership prior to the acquisition     40.00%