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Related Party Transactions (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 23 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2019 USD ($) | Aug. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) apartment | Feb. 28, 2019 USD ($) | Oct. 31, 2018 USD ($) apartment | May 31, 2018 USD ($) apartment | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($) investment | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 30, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed in connection with acquisition |  |  |  |  |  |  |  |  |  | $ 0 | $ 98,681,000 |  |  |  |  |  |
Payments to acquire preferred equity investments |  |  |  |  |  |  |  |  |  | 43,817,000 | 167,278,000 |  |  |  |  |  |
Preferred return rate |  |  |  |  |  |  |  | 11.30% |  |  |  |  |  |  |  |  |
Commitment to fund preferred equity investment |  |  |  |  |  |  |  | $ 91,400,000 |  |  |  |  |  |  |  |  |
Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management and other fees from affiliates |  |  |  |  |  |  | $ 2,600,000 |  | $ 3,500,000 | 5,700,000 | 6,900,000 |  |  |  |  |  |
Development and redevelopment fees |  |  |  |  |  |  | 300,000 |  | $ 1,300,000 | 800,000 | $ 2,400,000 |  |  |  |  |  |
Short-term loans outstanding and due from affiliates |  |  |  |  |  |  | 5,200,000 |  |  | 5,200,000 |  |  |  |  |  | $ 4,400,000 |
Affiliated Entity | Related party bridge loan - Wesco V |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable | $ 85,500,000 | $ 89,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 1.30% | 1.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliated Entity | Related party bridge loan - BEX IV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  | $ 44,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chairman and founder |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire preferred equity investments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000.0 |  |  |
Number of preferred equity method investments acquired during period (in investments) | investment |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Preferred stock, stated interest percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.50% |  |  |
Redeemed amount |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000.0 | $ 5,000,000.0 |  |  |  |
Chairman and founder | Multifamily development community in La Mesa, CA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire preferred equity investments |  |  |  | $ 24,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred return rate |  |  |  | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Chairman and founder | Apartment home community development development in Burlingame, CA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  |  |  |  | 268 |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire preferred equity investments |  |  |  |  | $ 18,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred return rate |  |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |
Chairman and founder | Marcus & Millichap Company (MMC) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brokerage commissions |  |  |  |  |  |  | $ 0 |  |  | $ 200,000 |  |  |  |  |  |  |
Chairman and founder | Marcus & Millichap Company (MMC) | Brio, Walnut Creek, CA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  |  | 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 164,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed in connection with acquisition |  |  | $ 98,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chairman and founder | Marcus & Millichap Company (MMC) | Apartment home community in Ventura, CA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  |  |  |  |  | 400 |  |  |  |  |  |  |  |  |  |  |
Preferred return rate |  |  |  |  |  | 10.25% |  |  |  |  |  |  |  |  |  |  |
Commitment to fund preferred equity investment |  |  |  |  |  | $ 26,500,000 |  |  |  |  |  |  |  |  |  |  |
Commitment funded amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,100,000 |  |
Chairman and founder | Marcus & Millichap Company (MMC) | Related party note due October 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,600,000

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