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Net Income Per Common Share and Net Income Per Common Unit (Tables) | 6 Months Ended
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Jun. 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 June 30, 2017 |  | Three Months Ended June 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 | $ | 70,759 |  |  | 65,729,074 |  |  | $ | 1.08 |  |  | $ | 72,013 |  |  | 65,451,110 |  |  | $ | 1.10 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 90,620 |  |  |  |  | — |  |  | 124,268 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 70,759 |  |  | 65,819,694 |  |  | $ | 1.08 |  |  | $ | 72,013 |  |  | 65,575,378 |  |  | $ | 1.10 |
| Six Months Ended June 30, 2017 |  | Six Months Ended June 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 | $ | 249,723 |  |  | 65,639,775 |  |  | $ | 3.80 |  |  | $ | 149,994 |  |  | 65,428,382 |  |  | $ | 2.29 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 91,515 |  |  |  |  | — |  |  | 130,429 |  |  |
DownREIT units | 738 |  |  | 210,728 |  |  |  |  | — |  |  | — |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 250,461 |  |  | 65,942,018 |  |  | $ | 3.80 |  |  | $ | 149,994 |  |  | 65,558,811 |  |  | $ | 2.29 |
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 June 30, 2017 |  | Three Months Ended June 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 | $ | 73,181 |  |  | 67,980,761 |  |  | $ | 1.08 |  |  | $ | 74,463 |  |  | 67,675,038 |  |  | $ | 1.10 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 90,620 |  |  |  |  | — |  |  | 124,268 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 73,181 |  |  | 68,071,381 |  |  | $ | 1.08 |  |  | $ | 74,463 |  |  | 67,799,306 |  |  | $ | 1.10 |
| Six Months Ended June 30, 2017 |  | Six Months Ended June 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 | $ | 258,291 |  |  | 67,891,734 |  |  | $ | 3.80 |  |  | $ | 155,228 |  |  | 67,654,279 |  |  | $ | 2.29 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 91,515 |  |  |  |  | — |  |  | 130,429 |  |  |
DownREIT units | 738 |  |  | 210,728 |  |  |  |  | — |  |  | — |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 259,029 |  |  | 68,193,977 |  |  | $ | 3.80 |  |  | $ | 155,228 |  |  | 67,784,708 |  |  | $ | 2.29 |

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