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Net Income Per Common Share and Net Income Per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Basic: |  |  |  |
Net income available to common stockholders | $ 70,759 | $ 72,013 | $ 249,723 | $ 149,994
Weighted average number of shares outstanding during the period (in shares) | 65,729,074 | 65,451,110 | 65,639,775 | 65,428,382
Net income available to common stockholders (in dollars per share) | $ 1.08 | $ 1.10 | $ 3.80 | $ 2.29
Diluted: |  |  |  |
Income from continuing operations available to common stockholders | $ 70,759 | $ 72,013 | $ 250,461 | $ 149,994
Adjusted income from continuing operations available to common stockholders (in shares) | 65,819,694 | 65,575,378 | 65,942,018 | 65,558,811
Net income available to common stockholders (in dollars per share) | $ 1.08 | $ 1.10 | $ 3.80 | $ 2.29
Essex Portfolio, L.P. [Member] |  |  |  |
Basic: |  |  |  |
Net income available to common stockholders | $ 73,181 | $ 74,463 | $ 258,291 | $ 155,228
Weighted average number of shares outstanding during the period (in shares) | 67,980,761 | 67,675,038 | 67,891,734 | 67,654,279
Net income available to common stockholders (in dollars per share) | $ 1.08 | $ 1.10 | $ 3.80 | $ 2.29
Diluted: |  |  |  |
Income from continuing operations available to common stockholders | $ 73,181 | $ 74,463 | $ 259,029 | $ 155,228
Adjusted income from continuing operations available to common stockholders (in shares) | 68,071,381 | 67,799,306 | 68,193,977 | 67,784,708
Net income available to common stockholders (in dollars per share) | $ 1.08 | $ 1.10 | $ 3.80 | $ 2.29
Employee Stock Option [Member] |  |  |  |
Basic: |  |  |  |
Income effect of Dilutive Securities | $ 0 | $ 0 | $ 0 | $ 0
Effect of dilutive securities (in shares) | 90,620 | 124,268 | 91,515 | 130,429
Diluted: |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 8,240 | 87,954 | 23,619 | 87,954
Employee Stock Option [Member] | Essex Portfolio, L.P. [Member] |  |  |  |
Basic: |  |  |  |
Income effect of Dilutive Securities | $ 0 | $ 0 | $ 0 | $ 0
Effect of dilutive securities (in shares) | 90,620 | 124,268 | 91,515 | 130,429
Diluted: |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 8,240 | 87,954 | 23,619 | 87,954
DownREIT Units [Member] |  |  |  |
Basic: |  |  |  |
Income effect of Dilutive Securities |  |  | $ 738 | $ 0
Effect of dilutive securities (in shares) |  |  | 210,728 | 0
DownREIT Units [Member] | Essex Portfolio, L.P. [Member] |  |  |  |
Basic: |  |  |  |
Income effect of Dilutive Securities |  |  | $ 738 | $ 0
Effect of dilutive securities (in shares) |  |  | 210,728 | 0
Convertible Limited Partnership Units [Member] |  |  |  |
Diluted: |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 2,251,687 | 2,223,928 | 2,251,959 | 2,225,897
Antidilutive securities excluded from computation of earnings per share, value | $ 2,500 | $ 2,400 | $ 8,600 | $ 5,200

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