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Real Estate Investments - Acquisitions (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2020 USD ($) community apartment | Dec. 31, 2019 USD ($) unit | Dec. 31, 2020 USD ($) unit | Dec. 31, 2019 USD ($) community apartment | Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of units acquired | unit |  |  | 2,020 |  |
Purchase Price |  |  | $ 463,400,000 | $ 373,300,000 |
Gain on remeasurement of co-investment |  |  | 234,694,000 | 31,535,000 | $ 1,253,000
Investment in real estate |  |  | 15,061,745,000 |  |
Encumbrance |  |  | 643,550,000 |  |
CPPIB Interest |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment interest acquired | 45.00% |  |  |  |
Value of property held by acquired investment | $ 1,000,000,000.0 |  |  |  |
Gain on remeasurement of co-investment | 234,700,000 |  |  |  |
Promote income | $ 6,500,000 |  |  |  |
Land and Land Improvements |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Purchase Price |  |  | 189,000,000.0 |  |
Building and Improvements |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Purchase Price |  |  | 846,000,000.0 |  |
Prepaid Expenses and Other Assets |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Purchase Price |  |  | $ 10,000,000.0 |  |
Hidden Valley |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Purchase Price |  | $ 24,200,000 |  |  |
Limited partnership interest |  | 25.00% |  |  |
Investment in real estate |  | $ 97,000,000.0 |  | 97,000,000.0 |
Encumbrance |  | $ 29,700,000 |  | $ 29,700,000 |
Apartment Building |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of communities held by acquired investment | community |  |  |  | 4 |
Number of units held by acquired investment | apartment |  |  |  | 849 |
Apartment Building | CPPIB Interest |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of units acquired | unit |  |  | 2,020 |  |
Essex Ownership Percentage |  |  | 100.00% |  |
Purchase Price |  |  | $ 463,400,000 |  |
Number of communities held by acquired investment | community | 6 |  |  |  |
Number of units held by acquired investment | apartment | 2,020 |  |  |  |
Apartment Building | Hidden Valley |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of units acquired | unit |  | 324 |  |  |

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- Definition Amount of lien or mortgage outstanding on real estate investment properties for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Subsection 28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column B)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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