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Related Party Transactions (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
apartment
Mar. 31, 2017
USD ($)
unit
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
investment
Dec. 31, 2016
USD ($)
Nov. 30, 2016
USD ($)
Related Party Transaction [Line Items]                        
Management and other fees from affiliates           $ 3,100,000 $ 3,100,000 $ 9,000,000 $ 9,600,000      
Development and redevelopment fees           700,000 $ 1,000,000 2,100,000 3,400,000      
Co-investments           1,124,577,000   1,124,577,000     $ 1,161,275,000  
Payments to acquire preferred equity investments               231,552,000 $ 121,972,000      
Short-term loans outstanding and due from various joint ventures           4,000,000   4,000,000     4,700,000  
Limited Liability Company [Member]                        
Related Party Transaction [Line Items]                        
Payments to acquire preferred equity investments                   $ 20,000,000    
Number of preferred equity method investments acquired during period (in investments) | investment                   3    
Preferred stock, stated interest percentage                   9.50%    
Limited Liability Company [Member] | Marcus and Millichamp Company TMMC Affiliate [Member] | Secured Note Receivable, 9.5% Interest Rate, Due October 2019 [Member]                        
Related Party Transaction [Line Items]                        
Notes receivable           6,600,000   6,600,000     6,600,000 $ 6,600,000
Affiliated Entity [Member] | Wesco V Property [Member] | Secured Note Receivable, 3.5% Interest Rate, Due December 16, 2017 [Member]                        
Related Party Transaction [Line Items]                        
Notes receivable $ 55,000,000         $ 55,000,000   $ 55,000,000     $ 0  
Stated interest rate 3.50%                      
Membership Interest In Sage At Cupertino [Member]                        
Related Party Transaction [Line Items]                        
Co-investments   $ 15,300,000 $ 15,300,000 $ 15,300,000 $ 15,300,000              
Number of units acquired       230 230              
Equity method investment, ownership percentage acquired     40.50%                  
Contract price   90,000,000                    
Mortgage encumbrance   $ 52,000,000 $ 52,000,000 $ 52,000,000 $ 52,000,000