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Real Estate Investments - Acquisitions and Sales Of Real Estate (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 USD ($) unit | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) unit | Sep. 30, 2019 USD ($) unit | Jun. 30, 2019 USD ($) unit | Mar. 31, 2019 USD ($) unit | Dec. 31, 2019 USD ($) community unit | Dec. 31, 2018 USD ($) community unit
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of units acquired | unit |  |  |  |  |  |  |  | 849 |
Purchase Price |  |  |  |  |  |  |  | $ 373,300,000 | $ 35,400,000
Investment in real estate | $ 14,038,142,000 |  |  | $ 14,038,142,000 |  |  |  | 14,038,142,000 |
Encumbrance | 990,667,000 |  |  | 990,667,000 |  |  |  | 990,667,000 |
Land and Land Improvements |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  |  |  | 72,400,000 |
Building and Improvements |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  |  |  | 402,400,000 |
Prepaid Expenses and Other Assets |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  |  |  | 3,300,000 |
Mortgage Notes Payable |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  |  |  | 149,000,000.0 |
One South Market |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Limited partnership interest |  |  | 45.00% |  |  |  |  |  |
Investment in real estate |  |  | $ 179,000,000.0 |  |  |  | $ 179,000,000.0 |  |
Encumbrance |  |  | $ 86,000,000.0 |  |  |  | $ 86,000,000.0 |  |
Brio |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Purchase Price |  | $ 164,900,000 |  |  |  |  |  |  |
Encumbrance |  | $ 98,700,000 |  |  |  | $ 98,700,000 |  |  |
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 |  |  |  | 97,000,000.0 |
Encumbrance | $ 29,700,000 |  |  | $ 29,700,000 |  |  |  | $ 29,700,000 |
Apartment Building |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of communities acquired | community |  |  |  |  |  |  |  | 4 | 1
Number of units acquired | unit |  |  |  |  |  |  |  | 849 | 166
Apartment Building | One South Market |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of units acquired | unit |  |  |  |  |  |  | 312 |  |
Essex Ownership Percentage |  |  | 100.00% |  |  |  | 100.00% |  |
Purchase Price |  |  |  |  |  |  | $ 80,600,000 |  |
Apartment Building | Brio |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of units acquired | unit |  |  |  |  |  | 300 |  |  |
Purchase Price |  |  |  |  |  | $ 164,900,000 |  |  |
Apartment Building | Township |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of units acquired | unit |  |  |  |  | 132 |  |  |  |
Essex Ownership Percentage |  |  |  |  | 100.00% |  |  |  |
Purchase Price |  |  |  |  | $ 88,700,000 |  |  |  |
Apartment Building | Pure Redmond |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of units acquired | unit |  |  |  | 105 |  |  |  |  |
Essex Ownership Percentage | 100.00% |  |  | 100.00% |  |  |  | 100.00% |
Purchase Price |  |  |  | $ 39,100,000 |  |  |  |  |
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=6590653&loc=d3e638233-123024 + Details
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- Definition Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest. + References Reference 1: 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 E)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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