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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, 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 September 30, 2018 |  | Three Months Ended September 30, 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 | $ | 80,975 |  |  | 66,052,108 |  |  | $ | 1.23 |  |  | $ | 79,723 |  |  | 65,994,896 |  |  | $ | 1.21 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 51,704 |  |  |  |  | — |  |  | 83,387 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 80,975 |  |  | 66,103,812 |  |  | $ | 1.22 |  |  | $ | 79,723 |  |  | 66,078,283 |  |  | $ | 1.21 |
| Nine Months Ended September 30, 2018 |  | Nine Months Ended September 30, 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 | $ | 272,333 |  |  | 66,047,990 |  |  | $ | 4.12 |  |  | $ | 329,446 |  |  | 65,759,450 |  |  | $ | 5.01 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 45,014 |  |  |  |  | — |  |  | 77,515 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 272,333 |  |  | 66,093,004 |  |  | $ | 4.12 |  |  | $ | 329,446 |  |  | 65,836,965 |  |  | $ | 5.00 |
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, 2018 |  | Three Months Ended September 30, 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 | $ | 83,764 |  |  | 68,325,091 |  |  | $ | 1.23 |  |  | $ | 82,444 |  |  | 68,246,008 |  |  | $ | 1.21 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 51,704 |  |  |  |  | — |  |  | 83,387 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 83,764 |  |  | 68,376,795 |  |  | $ | 1.23 |  |  | $ | 82,444 |  |  | 68,329,395 |  |  | $ | 1.21 |
| Nine Months Ended September 30, 2018 |  | Nine Months Ended September 30, 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 | $ | 281,714 |  |  | 68,321,153 |  |  | $ | 4.12 |  |  | $ | 340,735 |  |  | 68,011,123 |  |  | $ | 5.01 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 45,014 |  |  |  |  | — |  |  | 77,515 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 281,714 |  |  | 68,366,167 |  |  | $ | 4.12 |  |  | $ | 340,735 |  |  | 68,088,638 |  |  | $ | 5.00 |

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