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v3.22.2.2

Organization and Basis of Presentation - Narrative (Details) | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2022 USD ($) investment partnership building community apartment project shares | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) investment partnership building community apartment project shares | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) investment partnership community shares
Real Estate Properties [Line Items] |  |  |  |  |
Apartment communities owned (in communities) | community | 253 |  | 253 |  |
Apartment units owned (in apartments) | apartment | 62,397 |  | 62,397 |  |
Ownership interest, number of commercial buildings (in commercial buildings) | building | 3 |  | 3 |  |
Ownership interest, number of unconsolidated joint venture projects (in projects) | project | 1 |  | 1 |  |
Equity securities | $ 200,000 |  | $ 200,000 |  | $ 800,000
Sales and maturities of marketable securities | 0 | $ 100,000 | 30,000,000 | $ 15,000,000 |
Marketable securities, realized gain (loss) | $ 0 | 0 | 12,400,000 | 2,500,000 |
Unrealized gain (loss) on equity securities recognized through income |  |  | $ (63,556,000) | 23,772,000 |
DownREIT limited partnerships consolidated by company (in partnerships) | partnership | 18 |  | 18 |  | 18
Communities within DownREIT partnerships (in communities) | community | 9 |  | 9 |  | 9
Number of previously consolidated co-investments considered VIE (in investments) | investment | 6 |  | 6 |  | 6
Assets related to variable interest entities net of intercompany eliminations | $ 938,400,000 |  | $ 938,400,000 |  | $ 909,300,000
Liabilities related to variable interest entities net of intercompany eliminations | 327,700,000 |  | 327,700,000 |  | 320,100,000
Noncontrolling interest in variable interest entity | 122,100,000 |  | 122,100,000 |  | 122,400,000
Fixed rate debt carrying amount | 5,700,000,000 |  | 5,700,000,000 |  | 5,700,000,000
Fixed rate debt fair value | 5,200,000,000 |  | 5,200,000,000 |  | 6,000,000,000
Variable rate debt, carrying amount | 442,600,000 |  | 442,600,000 |  | 564,900,000
Variable rate debt fair value | 439,900,000 |  | 439,900,000 |  | 561,700,000
Capitalized internal costs related to development and redevelopment projects | 4,500,000 | 5,600,000 | 15,700,000 | 17,500,000 |
Redeemable noncontrolling interest | $ 29,238,000 |  | $ 29,238,000 |  | $ 34,666,000
Minimum |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Apartment lease term | 9 months |  | 9 months |  |
Maximum |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Apartment lease term | 12 months |  | 12 months |  |
Interest And Other Income (Expense) |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Unrealized gain (loss) on equity securities recognized through income | $ (17,100,000) | $ 7,100,000 | $ (63,600,000) | 23,800,000 |
Essex Portfolio, L.P. |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Operating Partnership units outstanding (in shares) | shares | 2,272,496 |  | 2,272,496 |  | 2,282,464
Redemption value of operating partnership units outstanding | $ 550,500,000 |  | $ 550,500,000 |  | $ 804,000,000
Unrealized gain (loss) on equity securities recognized through income |  |  | (63,556,000) | $ 23,772,000 |
Redeemable noncontrolling interest | $ 29,238,000 |  | $ 29,238,000 |  | $ 34,666,000
Partnership Interest |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Ownership interest in partnership | 96.60% | 96.60% | 96.60% | 96.60% |

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