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Organization and Basis of Presentation - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) apartment investment community partnership building project shares | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) apartment investment community partnership building project shares | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) partnership community investment 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 |  | $ 200 |  | $ 800
Sales and maturities of marketable securities | 2,100 | $ 100 | 30,000 | $ 14,900 |
Marketable securities, realized gain (loss) | $ 300 | (100) | 12,400 | 2,500 |
Unrealized gain (loss) on equity securities recognized through income |  |  | $ (46,441) | 16,681 |
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 | $ 917,900 |  | $ 917,900 |  | $ 909,300
Liabilities related to variable interest entities net of intercompany eliminations | 319,200 |  | 319,200 |  | 320,100
Noncontrolling interest in variable interest entity | 122,500 |  | 122,500 |  | 122,400
Fixed rate debt carrying amount | 5,700,000 |  | 5,700,000 |  | 5,700,000
Fixed rate debt fair value | 5,400,000 |  | 5,400,000 |  | 6,000,000
Variable rate debt, carrying amount | 286,500 |  | 286,500 |  | 564,900
Variable rate debt fair value | 284,600 |  | 284,600 |  | 561,700
Capitalized internal costs related to development and redevelopment projects | 5,800 | 5,500 | 11,200 | 11,900 |
Redeemable noncontrolling interest | $ 33,213 |  | $ 33,213 |  | $ 34,666
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 | $ (21,900) | $ 10,400 | $ (46,400) | 16,700 |
Essex Portfolio, L.P. |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Operating Partnership units outstanding (in shares) | shares | 2,273,496 |  | 2,273,496 |  | 2,282,464
Redemption value of operating partnership units outstanding | $ 594,500 |  | $ 594,500 |  | $ 804,000
Unrealized gain (loss) on equity securities recognized through income |  |  | (46,441) | $ 16,681 |
Redeemable noncontrolling interest | $ 33,213 |  | $ 33,213 |  | $ 34,666
Partnership Interest |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Ownership interest in partnership | 96.60% | 96.60% | 96.60% | 96.60% |

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