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Related Party Transactions (Details) | 1 Months Ended | 12 Months Ended | 32 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 | Mar. 31, 2017 USD ($) unit | Dec. 31, 2020 USD ($) unit | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($) investment | Dec. 31, 2020 USD ($) | Nov. 30, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management and other fees from affiliates |  |  |  |  |  |  |  | $ 11,300,000 | $ 13,800,000 | $ 13,900,000 |  |  |  |
Revenues from development and redevelopment fees |  |  |  |  |  |  |  | 1,700,000 | 4,300,000 | 4,800,000 |  |  |  |
Notes receivable |  |  |  |  |  |  |  | $ 195,104,000 | 134,365,000 |  |  |  | $ 195,104,000 |
Number of units acquired | unit |  |  |  |  |  |  |  | 2,020 |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  | $ 463,400,000 | 373,300,000 |  |  |  |  |
Debt assumed in connection with acquisition |  |  |  |  |  |  |  | 0 | 143,006,000 | 45,804,000 |  |  |  |
Payments to acquire equity method investments |  |  |  |  |  |  |  | 114,017,000 | 402,284,000 | 162,437,000 |  |  |  |
Co-investments |  |  |  |  |  |  |  | 1,018,010,000 | 1,335,339,000 |  |  |  | 1,018,010,000 |
Encumbrance |  |  |  |  |  |  |  | 643,550,000 |  |  |  |  | 643,550,000 |
Redeemed equity method investment |  |  |  |  |  |  |  |  |  | 5,000,000.0 | $ 5,000,000.0 |  |  |
Brio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  |  | 300 |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 164,900,000 |  |  |  |  |  |  |  |  |  |  |
Debt assumed in connection with acquisition |  |  | $ 98,700,000 |  |  |  |  |  |  |  |  |  |  |
Apartment Home Community in Ventura, California |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  |  |  |  |  | 400 |  |  |  |  |  |  |  |
Annualized preferred return rate |  |  |  |  |  | 10.25% |  |  |  |  |  |  |  |
Preferred equity investment, commitment to fund |  |  |  |  |  | $ 26,500,000 |  |  |  |  |  |  |  |
Purchase commitment, funded amount |  |  |  |  |  |  |  |  |  |  |  |  | 23,400,000 |
Membership Interest in Sage at Cupertino |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | unit |  |  |  |  |  |  | 230 |  |  |  |  |  |  |
Co-investments |  |  |  |  |  |  | $ 15,300,000 |  |  |  |  |  |  |
Investment interest acquired |  |  |  |  |  |  | 40.50% |  |  |  |  |  |  |
Contract price |  |  |  |  |  |  | $ 90,000,000.0 |  |  |  |  |  |  |
Encumbrance |  |  |  |  |  |  | $ 52,000,000.0 |  |  |  |  |  |  |
Related Party Bridge Loans on Property Acquired by Wesco V |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  |  |  | 0 | 85,713,000 |  |  |  | 0 |
Marcus and Millichamp Company TMMC Affiliate | Related Party Note Receivable, Secured, Bearing Interest at 9.5%, Due October 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,600,000
Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due from Affiliates |  |  |  |  |  |  |  | 4,700,000 | 4,400,000 |  |  |  | $ 4,700,000 |
Affiliated Entity | Multifamily Development in Mountain View, California |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  | $ 24,500,000 |  |  |  |  |  |  |  |  |  |
Annualized preferred return rate |  |  |  | 11.00% |  |  |  |  |  |  |  |  |  |
Affiliated Entity | Home Community Development in Burlingame, California |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  |  |  |  | 268 |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  | $ 18,600,000 |  |  |  |  |  |  |  |  |
Annualized preferred return rate |  |  |  |  | 12.00% |  |  |  |  |  |  |  |  |
Affiliated Entity | Related Party Bridge Loans on Property Acquired by Wesco V |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, related parties | $ 85,500,000 | $ 89,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 1.30% | 1.30% |  |  |  |  |  |  |  |  |  |  |  |
Affiliated Entity | Related Party Bridge Loan on Property Acquired by Bex Iv |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, related parties |  | $ 44,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |
Limited Liability Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000.0 |  |
Number of equity method investments acquired during the period | investment |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Cumulative dividend rate |  |  |  |  |  |  |  |  |  |  |  | 9.50% |  |
Disposition of Multi-family Properties | Marcus and Millichamp Company TMMC Affiliate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for brokerage fees |  |  |  |  |  |  |  | $ 200,000 | $ 0 | $ 0 |  |  |  |

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