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Net Income Per Common Share and Net Income Per Common Unit (Tables) | 9 Months Ended
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Sep. 30, 2017
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 September 30, 2017 |  | Three Months Ended September 30, 2016
| 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 | $ | 79,723 |  |  | 65,994,896 |  |  | $ | 1.21 |  |  | $ | 65,561 |  |  | 65,507,669 |  |  | $ | 1.00 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 83,387 |  |  |  |  | — |  |  | 109,882 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 79,723 |  |  | 66,078,283 |  |  | $ | 1.21 |  |  | $ | 65,561 |  |  | 65,617,551 |  |  | $ | 1.00 |
| Nine Months Ended September 30, 2017 |  | Nine Months Ended September 30, 2016
| 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 | $ | 329,446 |  |  | 65,759,450 |  |  | $ | 5.01 |  |  | $ | 215,555 |  |  | 65,455,004 |  |  | $ | 3.29 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 77,515 |  |  |  |  | — |  |  | 123,657 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 329,446 |  |  | 65,836,965 |  |  | $ | 5.00 |  |  | $ | 215,555 |  |  | 65,578,661 |  |  | $ | 3.29 |
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 September 30, 2017 |  | Three Months Ended September 30, 2016
| 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 | $ | 82,444 |  |  | 68,246,008 |  |  | $ | 1.21 |  |  | $ | 67,784 |  |  | 67,728,621 |  |  | $ | 1.00 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 83,387 |  |  |  |  | — |  |  | 109,882 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 82,444 |  |  | 68,329,395 |  |  | $ | 1.21 |  |  | $ | 67,784 |  |  | 67,838,503 |  |  | $ | 1.00 |
| Nine Months Ended September 30, 2017 |  | Nine Months Ended September 30, 2016
| 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 | $ | 340,735 |  |  | 68,011,123 |  |  | $ | 5.01 |  |  | $ | 223,012 |  |  | 67,679,240 |  |  | $ | 3.30 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 77,515 |  |  |  |  | — |  |  | 123,657 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 340,735 |  |  | 68,088,638 |  |  | $ | 5.00 |  |  | $ | 223,012 |  |  | 67,802,897 |  |  | $ | 3.29 |

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