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Real Estate Investments - Sales of Real Estate Investments (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
unit
Jun. 30, 2018
USD ($)
unit
Dec. 31, 2018
USD ($)
community
unit
Dec. 31, 2017
USD ($)
community
unit
Dec. 31, 2016
USD ($)
community
unit
Real Estate Properties [Line Items]            
Revenues       $ 1,400,053 $ 1,363,899 $ 1,294,001
Deferred tax expense on gain on sale of real estate and land       0 0 4,410
Palo Alto, CA [Member]            
Real Estate Properties [Line Items]            
Proceeds from sale of headquarters building $ 18,000          
Gain on sale of corporate headquarters $ 9,600          
Rental and other property [Member]            
Real Estate Properties [Line Items]            
Revenues       $ 1,390,870 $ 1,354,325 $ 1,285,723
Communities Sold In 2018 [Member]            
Real Estate Properties [Line Items]            
Number of communities sold | community       2    
Number of units sold | unit       669    
Gain on sale of properties       $ 61,900    
Gain on sale of real estate       61,900    
Communities Sold In 2018 [Member] | Rental and other property [Member]            
Real Estate Properties [Line Items]            
Revenues       $ 352,000    
Domain [Member]            
Real Estate Properties [Line Items]            
Number of units sold | unit     379      
Essex Ownership Percentage     100.00%      
Gain on sale of real estate     $ 22,300      
Domain [Member] | Rental and other property [Member]            
Real Estate Properties [Line Items]            
Revenues     $ 132,000      
Eighth And Hope [Member]            
Real Estate Properties [Line Items]            
Number of units sold | unit   290        
Essex Ownership Percentage   100.00%        
Gain on sale of real estate   $ 39,600        
Eighth And Hope [Member] | Rental and other property [Member]            
Real Estate Properties [Line Items]            
Revenues   $ 220,000        
Communities Sold In 2017 [Member]            
Real Estate Properties [Line Items]            
Number of communities sold | community         1  
Number of units sold | unit         270  
Gain on sale of properties         $ 26,200  
Communities Sold In 2017 [Member] | Rental and other property [Member]            
Real Estate Properties [Line Items]            
Revenues         $ 132,500  
Communities Sold In 2016 [Member]            
Real Estate Properties [Line Items]            
Number of communities sold | community           3
Number of units sold | unit           323
Gain on sale of properties           $ 14,000
Deferred tax expense on gain on sale of real estate and land           4,400
Communities Sold In 2016 [Member] | Rental and other property [Member]            
Real Estate Properties [Line Items]            
Revenues           $ 80,800