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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 |  |  |  |  |  |  |

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