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Organization and Basis of Presentation - Accumulated Other Comprehensive Loss - Partnership (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Balance at period beginning | $ 6,393,844 |
Balance at period end | 6,415,004 |
Essex Portfolio, L.P. [Member] | Accumulated Other Comprehensive Loss, Net [Member] |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Balance at period beginning | (9,738) |
Cumulative effect upon adoption of ASU No. 2017-12 |  | $ 181
Other comprehensive (loss) income before reclassification | (303) |
Amounts reclassified from accumulated other comprehensive loss | (5,892) |
Other comprehensive income | (6,014) |
Balance at period end | (15,752) |
Essex Portfolio, L.P. [Member] | Change in Fair Value and Amortization of Swap Settlements [Member] |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Balance at period beginning | (9,593) |
Cumulative effect upon adoption of ASU No. 2017-12 |  | 181
Other comprehensive (loss) income before reclassification | (506) |
Amounts reclassified from accumulated other comprehensive loss | (5,860) |
Other comprehensive income | (6,185) |
Balance at period end | (15,778) |
Essex Portfolio, L.P. [Member] | Unrealized Gains/(Loss) on Available for Sale Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Balance at period beginning | (145) |
Cumulative effect upon adoption of ASU No. 2017-12 |  | $ 0
Other comprehensive (loss) income before reclassification | 203 |
Amounts reclassified from accumulated other comprehensive loss | (32) |
Other comprehensive income | 171 |
Balance at period end | $ 26 |

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