XML 63 R38.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Net Income Per Common Share and Net Income Per Common Unit (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Net Income Per Share and Net Income Per Unit [Line Items] |
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):
| 2018 |  | 2017 |  | 2016
| 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 | 390,153 |  |  | 66,041,058 |  |  | $ | 5.91 |  |  | 433,059 |  |  | 65,829,155 |  |  | $ | 6.58 |  |  | 411,124 |  |  | 65,471,540 |  |  | $ | 6.28 |
Effect of Dilutive Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 44,031 |  |  |  |  | — |  |  | 69,100 |  |  |  |  | — |  |  | 116,276 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | 390,153 |  |  | 66,085,089 |  |  | $ | 5.90 |  |  | 433,059 |  |  | 65,898,255 |  |  | $ | 6.57 |  |  | 411,124 |  |  | 65,587,816 |  |  | $ | 6.27 |
Essex Portfolio, L.P. [Member] |
Net Income Per Share and Net Income Per Unit [Line Items] |
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):
| 2018 |  | 2017 |  | 2016
| 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 | $ | 403,605 |  |  | 68,315,999 |  |  | $ | 5.91 |  |  | $ | 447,884 |  |  | 68,081,730 |  |  | $ | 6.58 |  |  | $ | 425,213 |  |  | 67,695,640 |  |  | $ | 6.28 |
Effect of Dilutive Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 44,031 |  |  |  |  |  | — |  |  | 69,100 |  |  |  |  |  | — |  |  | 116,276 |  |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 403,605 |  |  | 68,360,030 |  |  | $ | 5.90 |  |  | $ | 447,884 |  |  | 68,150,830 |  |  | $ | 6.57 |  |  | $ | 425,213 |  |  | 67,811,916 |  |  | $ | 6.27 |

X
- Definition The amount of net income or loss for the period per each share. + References No definition available. + Details
Name: | ess_NetIncomePerCommonShareTableTextBlock
Namespace Prefix: | ess_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | ess_NetIncomePerShareAndNetIncomePerUnitLineItems
Namespace Prefix: | ess_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=ess_EssexPortfolioL.P.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |