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Net Income Per Common Share and Net Income Per Common Unit (Tables) | 12 Months Ended
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Dec. 31, 2020
Net Income Per Share and Net Income Per Unit [Line Items] |
Schedule of Net Income Per Common Share and Net Income Per Unit | Basic and diluted income per share is calculated as follows for the years ended December 31 ($ in thousands, except share and per share amounts):
| 2020 |  | 2019 |  | 2018
| Income |  | Weighted- average Common Shares |  | Per Common Share Amount |  | 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 | $ | 568,870 |  |  | 65,454,057 |  |  | $ | 8.69 |  |  | $ | 439,286 |  |  | 65,840,422 |  |  | $ | 6.67 |  |  | $ | 390,153 |  |  | 66,041,058 |  |  | $ | 5.91 |
Effect of Dilutive Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 16,678 |  |  |  |  | — |  |  | 99,033 |  |  |  |  | — |  |  | 44,031 |  |  |
DownREIT units | 783 |  |  | 94,247 |  |  |  |  | — |  |  | — |  |  |  |  | — |  |  | — |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 569,653 |  |  | 65,564,982 |  |  | $ | 8.69 |  |  | $ | 439,286 |  |  | 65,939,455 |  |  | $ | 6.66 |  |  | $ | 390,153 |  |  | 66,085,089 |  |  | $ | 5.90 |
Essex Portfolio, L.P. |
Net Income Per Share and Net Income Per Unit [Line Items] |
Schedule of Net Income Per Common Share and Net Income Per Unit | Basic and diluted income per unit is calculated as follows for the years ended December 31 ($ in thousands, except unit and per unit amounts):
| 2020 |  | 2019 |  | 2018
| Income |  | Weighted- average Common Units |  | Per Common Unit Amount |  | 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 | $ | 588,782 |  |  | 67,750,665 |  |  | $ | 8.69 |  |  | $ | 454,629 |  |  | 68,140,900 |  |  | $ | 6.67 |  |  | $ | 403,605 |  |  | 68,315,999 |  |  | $ | 5.91 |
Effect of Dilutive Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 16,678 |  |  |  |  | — |  |  | 99,033 |  |  |  |  | — |  |  | 44,031 |  |  |
DownREIT units | 783 |  |  | 94,247 |  |  |  |  | — |  |  | — |  |  |  |  | — |  |  | — |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 589,565 |  |  | 67,861,590 |  |  | $ | 8.69 |  |  | $ | 454,629 |  |  | 68,239,933 |  |  | $ | 6.66 |  |  | $ | 403,605 |  |  | 68,360,030 |  |  | $ | 5.90 |

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- Definition The amount of net income or loss for the period per each share. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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