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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Basic: |  |  |  |
Net income available to common stockholders | $ 79,723 | $ 65,561 | $ 329,446 | $ 215,555
Weighted average number of shares/common units outstanding during the period (in shares) | 65,994,896 | 65,507,669 | 65,759,450 | 65,455,004
Net income available to common stockholders/unitholders (in dollars per share) | $ 1.21 | $ 1.00 | $ 5.01 | $ 3.29
Diluted: |  |  |  |
Income from continuing operations available to common stockholders | $ 79,723 | $ 65,561 | $ 329,446 | $ 215,555
Adjusted income from continuing operations available to common stockholders (in shares) | 66,078,283 | 65,617,551 | 65,836,965 | 65,578,661
Net income available to common stockholders/unitholders (in dollars per share) | $ 1.21 | $ 1.00 | $ 5.00 | $ 3.29
Essex Portfolio, L.P. [Member] |  |  |  |
Basic: |  |  |  |
Net income available to common stockholders | $ 82,444 | $ 67,784 | $ 340,735 | $ 223,012
Weighted average number of shares/common units outstanding during the period (in shares) | 68,246,008 | 67,728,621 | 68,011,123 | 67,679,240
Net income available to common stockholders/unitholders (in dollars per share) | $ 1.21 | $ 1.00 | $ 5.01 | $ 3.30
Diluted: |  |  |  |
Income from continuing operations available to common stockholders | $ 82,444 | $ 67,784 | $ 340,735 | $ 223,012
Adjusted income from continuing operations available to common stockholders (in shares) | 68,329,395 | 67,838,503 | 68,088,638 | 67,802,897
Net income available to common stockholders/unitholders (in dollars per share) | $ 1.21 | $ 1.00 | $ 5.00 | $ 3.29
Employee Stock Option [Member] |  |  |  |
Basic: |  |  |  |
Income effect of Dilutive Securities | $ 0 | $ 0 | $ 0 | $ 0
Effect of dilutive securities (in shares) | 83,387 | 109,882 | 77,515 | 123,657
Diluted: |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 0 | 40,900 | 2,352 | 76,054
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) | 83,387 | 109,882 | 77,515 | 123,657
Diluted: |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 0 | 40,900 | 2,352 | 76,054
Convertible Limited Partnership Units [Member] |  |  |  |
Diluted: |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 2,251,112 | 2,220,952 | 2,251,673 | 2,224,236
Antidilutive securities excluded from computation of earnings per share, value | $ 2,700 | $ 2,200 | $ 11,300 | $ 7,500

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