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Subsequent Events/Other - Additional Information (Details)
$ in Thousands
2 Months Ended 12 Months Ended
Jan. 01, 2019
USD ($)
Feb. 21, 2019
USD ($)
Property
ApartmentUnit
Dec. 31, 2018
USD ($)
Property
ApartmentUnit
Dec. 31, 2017
USD ($)
Property
ApartmentUnit
Dec. 31, 2016
USD ($)
ApartmentUnit
Subsequent Event [Line Items]          
Properties acquired | Property     5 4  
Property Units acquired | ApartmentUnit     1,478 947  
Purchase Price     $ 707,005 $ 468,050  
Debt instrument, maturity date     Jan. 10, 2022    
Disposed units | ApartmentUnit     1,292 1,194  
Proceeds from sale of property     $ 708,820 $ 388,400  
Interest and other income     $ 15,317 $ 6,136 $ 65,773
Military Housing [Member]          
Subsequent Event [Line Items]          
Disposed units | ApartmentUnit         5,161
Proceeds from sale of property         $ 63,300
Interest and other income         $ 52,400
Mortgages [Member]          
Subsequent Event [Line Items]          
Debt instrument, maturity date     May 28, 2061 May 28, 2061  
Fannie Mae Pool 3 [Member] | Mortgages [Member]          
Subsequent Event [Line Items]          
Debt instrument, interest rate, stated percentage     6.08% 5.987%  
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Properties acquired | Property   3      
Property Units acquired | ApartmentUnit   579      
Purchase Price   $ 258,700      
Subsequent Event [Member] | Fannie Mae Pool 3 [Member] | Mortgages [Member]          
Subsequent Event [Line Items]          
Proceeds from issuance of long-term debt $ 288,100        
Debt instrument, maturity date Mar. 01, 2029        
Debt instrument, interest rate, stated percentage 3.94%