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Related Party Transactions (Details) | 1 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2018 USD ($) apartment | May 31, 2018 USD ($) apartment | Nov. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) unit | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) investment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($) investment | Nov. 30, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Management and other fees from affiliates |  |  |  |  | $ 3,600,000 | $ 3,100,000 |  | $ 10,000,000 | $ 9,000,000 |  |  |
Development and redevelopment fees |  |  |  |  | 1,300,000 | $ 700,000 |  | 3,200,000 | 2,100,000 |  |  |
Payments to acquire preferred equity investments |  |  |  |  |  |  |  | 100,202,000 | $ 231,552,000 |  |  |
Co-investments |  |  |  |  | 1,267,593,000 |  | $ 1,267,593,000 | $ 1,267,593,000 |  | $ 1,155,984,000 |  |
Equity investment, redeemed amount |  |  |  |  |  |  |  |  |  | 5,000,000 |  |
Number of equity method investments scheduled to mature | investment |  |  |  |  |  |  |  | 2 |  |  |  |
Short-term loans outstanding and due from various joint ventures |  |  |  |  | 3,600,000 |  | 3,600,000 | $ 3,600,000 |  | 5,100,000 |  |
Apartment Home Community In Ventura, California [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  | 400 |  |  |  |  |  |  |  |  |  |
Preferred returns rate |  | 10.25% |  |  |  |  |  |  |  |  |  |
Commitment to fund preferred equity investment |  | $ 26,500,000 |  |  |  |  |  |  |  |  |  |
Commitment funded amount |  |  |  |  |  |  | 20,600,000 |  |  |  |  |
Membership Interest In Sage At Cupertino [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | unit |  |  |  | 230 |  |  |  |  |  |  |  |
Co-investments |  |  |  | $ 15,300,000 |  |  |  |  |  |  |  |
Equity method investment, ownership percentage acquired |  |  |  | 40.50% |  |  |  |  |  |  |  |
Contract price |  |  |  | $ 90,000,000 |  |  |  |  |  |  |  |
Mortgage encumbrance |  |  |  | $ 52,000,000 |  |  |  |  |  |  |  |
Affiliated Entity [Member] | Subsequent Event [Member] | Home Community Development in Burlingame, California [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire preferred equity investments | $ 18,600,000 |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment | 268 |  |  |  |  |  |  |  |  |  |  |
Preferred returns rate | 12.00% |  |  |  |  |  |  |  |  |  |  |
Affiliated Entity [Member] | BEX III [Member] | Secured Note Receivable, 3.5% Interest Rate, Due March 9, 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  | $ 29,500,000 |  | 0 |  | 0 | 0 |  |  |  |
Note receivable, related party, interest rate |  |  | 3.50% |  |  |  |  |  |  |  |  |
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, 9.50% Interest Rate, Due October 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  | $ 6,600,000 |  | $ 6,600,000 | $ 6,600,000 |  | $ 6,700,000 |  | $ 6,600,000

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