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Subsequent Events (Details)
1 Months Ended 12 Months Ended
Feb. 29, 2020
USD ($)
Jan. 31, 2020
USD ($)
community
apartment
Dec. 31, 2019
community
unit
Dec. 31, 2018
community
unit
Subsequent Event [Line Items]        
Number of units acquired | unit     849  
Subsequent Event        
Subsequent Event [Line Items]        
Proceeds from related party debt   $ 85,800,000    
Percentage of price to par value 99.628%      
Apartment Building        
Subsequent Event [Line Items]        
Number of communities acquired | community     4 1
Number of units acquired | unit     849 166
Canadian Pension Plan Investment Board (CPPIB) | Subsequent Event        
Subsequent Event [Line Items]        
Limited partnership interest   45.00%    
Future value of development   $ 1,000,000,000.0    
Canadian Pension Plan Investment Board (CPPIB) | Apartment Building | Subsequent Event        
Subsequent Event [Line Items]        
Number of communities acquired | community   6    
Number of units acquired | apartment   2,020    
Unsecured Bonds 2.650% | Senior Notes | Subsequent Event        
Subsequent Event [Line Items]        
Proceeds from issuance of unsecured debt $ 500,000,000.0      
Coupon rate 2.65%