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Net Income Per Common Share and Net Income Per Common Unit (Tables) | 3 Months Ended
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Mar. 31, 2018
Net Income Per Share and Net Income Per Unit [Line Items] |
Schedule of net income per common share | Essex Property Trust, Inc.
| Three Months Ended March 31, 2018 |  | Three Months Ended March 31, 2017
| Income |  | Weighted- average Common Shares |  | Per Common Share Amount |  | Income |  | Weighted- average Common Shares |  | Per Common Share Amount
Basic: |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 90,918 |  |  | 66,044,022 |  |  | $ | 1.38 |  |  | $ | 178,964 |  |  | 65,549,484 |  |  | $ | 2.73 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 38,495 |  |  |  |  | — |  |  | 96,778 |  |  |
DownREIT units | — |  |  | — |  |  |  |  | 373 |  |  | 213,228 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 90,918 |  |  | 66,082,517 |  |  | $ | 1.38 |  |  | $ | 179,337 |  |  | 65,859,490 |  |  | $ | 2.72 |
Essex Portfolio, L.P. [Member] |
Net Income Per Share and Net Income Per Unit [Line Items] |
Schedule of net income per common share | Essex Portfolio, L.P.
| Three Months Ended March 31, 2018 |  | Three Months Ended March 31, 2017
| Income |  | Weighted- average Common Units |  | Per Common Unit Amount |  | Income |  | Weighted- average Common Units |  | Per Common Unit Amount
Basic: |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 94,050 |  |  | 68,317,435 |  |  | $ | 1.38 |  |  | $ | 185,110 |  |  | 67,801,718 |  |  | $ | 2.73 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 38,495 |  |  |  |  | — |  |  | 96,778 |  |  |
DownREIT units | — |  |  | — |  |  |  |  | 373 |  |  | 213,228 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 94,050 |  |  | 68,355,930 |  |  | $ | 1.38 |  |  | $ | 185,483 |  |  | 68,111,724 |  |  | $ | 2.72 |

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