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Organization and Basis of Presentation - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 USD ($) community apartment building partnership project investment shares | Sep. 30, 2024 USD ($) community | Sep. 30, 2025 USD ($) community apartment building partnership project investment shares | Sep. 30, 2024 USD ($) lawsuit community | Dec. 31, 2024 USD ($) community investment partnership shares
Real Estate Properties [Line Items] |  |  |  |  |
Apartment communities owned (in communities) | community | 257 |  | 257 |  |
Apartment units owned (in apartments) | apartment | 62,451 |  | 62,451 |  |
Ownership interest, number of commercial buildings (in commercial buildings) | building | 2 |  | 2 |  |
Development pipeline consisting of consolidated project | project | 1 |  | 1 |  |
Marketable securities (less than) | $ 100 |  | $ 100 |  | $ 100
DownREIT limited partnerships consolidated by company (in partnerships) | partnership | 18 |  | 18 |  | 18
Communities within DownREIT partnerships (in communities) | community | 10 |  | 10 |  | 9
Number of previously consolidated co-investments considered VIE (in investments) | investment | 4 |  | 4 |  | 5
Assets related to variable interest entities net of intercompany eliminations | $ 952,800 |  | $ 952,800 |  | $ 893,000
Liabilities related to variable interest entities net of intercompany eliminations | 246,300 |  | 246,300 |  | 319,100
Noncontrolling interest in variable interest entity | 101,200 |  | 101,200 |  | 105,100
Fixed rate debt carrying amount | 5,600,000 |  | 5,600,000 |  | 5,800,000
Fixed rate debt fair value | 5,400,000 |  | 5,400,000 |  | 5,500,000
Variable rate debt, carrying amount | 1,100,000 |  | 1,100,000 |  | 752,300
Variable rate debt fair value | 1,000,000 |  | 1,000,000 |  | 749,400
Capitalized internal costs related to development and redevelopment projects | 6,500 | $ 4,600 | 18,800 | $ 14,800 |
Redeemable noncontrolling interest | $ 29,746 |  | $ 29,746 |  | $ 30,849
Number of company settled lawsuits | lawsuit |  |  |  | 2 |
Construction defects at communities | community |  | 2 |  | 2 |
Gain contingencies from legal settlements |  |  |  | $ 42,500 |
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 |  |
Essex Portfolio, L.P. |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Operating partnership units outstanding (in shares) | shares | 2,256,414 |  | 2,256,414 |  | 2,331,251
Redemption value of operating partnership units outstanding | $ 604,000 |  | $ 604,000 |  | $ 665,400
Redeemable noncontrolling interest | $ 29,746 |  | $ 29,746 |  | $ 30,849
Partnership Interest |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Ownership interest in partnership |  |  | 96.60% |  | 96.50%

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