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Subsequent Events (Details)
1 Months Ended
Nov. 05, 2019
USD ($)
home
Oct. 31, 2019
USD ($)
home
boat_slip
Nov. 01, 2019
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Subsequent Event [Line Items]          
Real Estate Investments, Net       $ 18,119,465,000 $ 17,730,930,000
Avalon Marina Bay [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Number Of Apartment Homes Sold | home   205      
Number of Boat Slips Sold | boat_slip   229      
Proceeds from Sale of Real Estate   $ 86,000,000      
Subsequent Event Dispositions [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Number Of Apartment Homes Held For Sale | home 250        
Real Estate Investments, Net $ 39,045,000        
Secured Debt [Member] | Notes Payable Maturities 2019, Fixed Rate [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Repayments of Secured Debt $ 65,749,000        
Debt Instrument, Interest Rate, Stated Percentage     3.38%