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Subsequent Events (Details)
ft² in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2022
USD ($)
home
community
ft²
Dec. 31, 2021
USD ($)
community
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
home
Jan. 31, 2022
USD ($)
community
home
Subsequent Event [Line Items]          
Number of communities held for sale | community   1      
Number of apartment homes acquired | home       1,175  
Payments to acquire other real estate | $   $ 771,692 $ 0 $ 420,517  
Subsequent Event | Avalon Flatirons          
Subsequent Event [Line Items]          
Number of apartment homes acquired | home 207        
Commercial square feet | ft² 16        
Payments to acquire other real estate | $ $ 95,000        
Subsequent Event | Subsequent Event Dispositions          
Subsequent Event [Line Items]          
Number of communities held for sale | community         2
Number of apartment homes held for sale | home         408
Real estate investment | $         $ 64,984
Subsequent Event | Avalon Ossining          
Subsequent Event [Line Items]          
Number of communities sold | community 1        
Number of apartment homes sold | home 168        
Gross sales price | $ $ 70,000        
Subsequent Event | Avalon West Long Branch          
Subsequent Event [Line Items]          
Number of apartment homes sold | home 180        
Gross sales price | $ $ 75,000