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Organization and Basis of Presentation - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 USD ($) apartment project partnership community building investment shares | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) investment partnership community shares
Real Estate Properties [Line Items] |  |  |
Apartment communities owned (in communities) | community | 251 |  |
Apartment units owned (in apartments) | apartment | 61,924 |  |
Ownership interest, number of commercial buildings (in commercial buildings) | building | 3 |  |
Ownership interest, number of unconsolidated joint venture projects (in projects) | project | 1 |  |
Marketable securities | $ 100 |  | $ 200
Sales and maturities of marketable securities | 26,700 | $ 27,900 |
Marketable securities, realized gain (loss) | 900 | 12,200 |
Unrealized gain (loss) on equity securities recognized through income | $ 368 | (24,585) |
DownREIT limited partnerships consolidated by company (in partnerships) | partnership | 18 |  | 18
Communities within DownREIT partnerships (in communities) | community | 9 |  | 9
Number of previously consolidated co-investments considered VIE (in investments) | investment | 6 |  | 6
Assets related to variable interest entities net of intercompany eliminations | $ 945,900 |  | $ 939,400
Liabilities related to variable interest entities net of intercompany eliminations | 326,700 |  | 324,300
Noncontrolling interest in variable interest entity | 121,400 |  | 121,500
Fixed rate debt carrying amount | 5,700,000 |  | 5,700,000
Fixed rate debt fair value | 5,300,000 |  | 5,200,000
Variable rate debt, carrying amount | 222,400 |  | 274,200
Variable rate debt fair value | 221,600 |  | 273,200
Capitalized internal costs related to development and redevelopment projects | 4,800 | 5,400 |
Redeemable noncontrolling interest | $ 30,208 |  | $ 27,150
Minimum |  |  |
Real Estate Properties [Line Items] |  |  |
Apartment lease term | 9 months |  |
Maximum |  |  |
Real Estate Properties [Line Items] |  |  |
Apartment lease term | 12 months |  |
Interest And Other Income (Expense) |  |  |
Real Estate Properties [Line Items] |  |  |
Unrealized gain (loss) on equity securities recognized through income | $ 400 | (24,600) |
Essex Portfolio, L.P. |  |  |
Real Estate Properties [Line Items] |  |  |
Operating Partnership units outstanding (in shares) | shares | 2,260,842 |  | 2,272,496
Redemption value of operating partnership units outstanding | $ 472,800 |  | $ 481,600
Unrealized gain (loss) on equity securities recognized through income | 368 | $ (24,585) |
Redeemable noncontrolling interest | $ 30,208 |  | $ 27,150
Partnership Interest |  |  |
Real Estate Properties [Line Items] |  |  |
Ownership interest in partnership | 96.60% |  | 96.60%

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