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Related Party Transactions (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 17 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) apartment | Feb. 28, 2019 USD ($) | Oct. 31, 2018 USD ($) apartment | May 31, 2018 USD ($) apartment | Nov. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) unit | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($) investment | Sep. 30, 2019 USD ($) | Nov. 30, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management and other fees from affiliates |  |  |  |  |  |  |  | $ 3,700 | $ 3,600 | $ 10,600 | $ 10,000 |  |  |  |  |
Development and redevelopment fees |  |  |  |  |  |  |  | 1,200 | $ 1,300 | 3,600 | 3,200 |  |  |  |  |
Debt assumed in connection with acquisition |  |  |  |  |  |  |  |  |  | 143,006 | 0 |  |  |  |  |
Payments to acquire preferred equity investments |  |  |  |  |  |  |  |  |  | 306,233 | $ 100,202 |  |  |  |  |
Co-investments |  |  |  |  |  |  |  | 1,413,861 |  | 1,413,861 |  | $ 1,300,140 |  |  | $ 1,413,861 |
Short-term loans outstanding and due from various joint ventures |  |  |  |  |  |  |  | 4,300 |  | $ 4,300 |  | 4,500 |  |  | 4,300 |
Brio, Walnut Creek, California [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  | 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  | $ 164,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed in connection with acquisition |  | $ 98,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multifamily Development in Mountain View, California [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred returns rate |  |  | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to fund preferred equity investment |  |  | $ 24,500 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Commitment funded amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,900 |
Membership Interest In Sage At Cupertino [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | unit |  |  |  |  |  |  | 230 |  |  |  |  |  |  |  |  |
Co-investments |  |  |  |  |  |  | $ 15,300 |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage acquired |  |  |  |  |  |  | 40.50% |  |  |  |  |  |  |  |  |
Contract price |  |  |  |  |  |  | $ 90,000 |  |  |  |  |  |  |  |  |
Mortgage encumbrance |  |  |  |  |  |  | $ 52,000 |  |  |  |  |  |  |  |  |
Related Party Bridge Loan on Property Acquired By BEX IV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |
Affiliated Entity [Member] | Multifamily Development in Mountain View, California [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire preferred equity investments |  |  | $ 24,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred returns rate |  |  | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliated Entity [Member] | Home Community Development in Burlingame, California [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  |  |  | 268 |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire preferred equity investments |  |  |  | $ 18,600 |  |  |  |  |  |  |  |  |  |  |  |
Preferred returns rate |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |
Affiliated Entity [Member] | Related Party Bridge Loans on Property Acquired by Bex III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  | $ 29,500 |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |
Affiliated Entity [Member] | Related Party Bridge Loans on Property Acquired By Wesco V [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable | $ 89,000 |  |  |  |  |  |  | 89,200 |  | $ 89,200 |  |  |  |  | 89,200 |
Interest rate | 1.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliated Entity [Member] | Related Party Bridge Loan on Property Acquired By BEX IV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable | $ 44,400 |  |  |  |  |  |  | 44,500 |  | 44,500 |  |  |  |  | 44,500 |
Interest rate | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited Liability Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire preferred equity investments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000 |  |
Number of preferred equity method investments acquired during period (in investments) | investment |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Preferred stock, stated interest percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.50% |  |
Redeemed amount |  |  |  |  |  |  |  |  |  |  |  | 5,000 | $ 5,000 |  |  |
Limited Liability Company [Member] | Secured Note Receivable, 9.90% Interest Rate, Due October 2019 [Member] | Marcus and Millichamp Company TMMC Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  |  |  | $ 6,600 |  | $ 6,600 |  | $ 6,600 |  |  | $ 6,600 | $ 6,600

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