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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Basic: |  |  |  |
Net income available to common stockholders/unitholders | $ 80,975 | $ 79,723 | $ 272,333 | $ 329,446
Weighted average number of shares/common units outstanding during the period (in shares) | 66,052,108 | 65,994,896 | 66,047,990 | 65,759,450
Net income available to common stockholders/unitholders (in dollars per share) | $ 1.23 | $ 1.21 | $ 4.12 | $ 5.01
Diluted: |  |  |  |
Net income available to common stockholders/unitholders | $ 80,975 | $ 79,723 | $ 272,333 | $ 329,446
Net income available to common stockholders/unitholders, weighted average common shares (in shares) | 66,103,812 | 66,078,283 | 66,093,004 | 65,836,965
Net income available to common stockholders/unitholders (in dollars per share) | $ 1.22 | $ 1.21 | $ 4.12 | $ 5.00
Essex Portfolio, L.P. [Member] |  |  |  |
Basic: |  |  |  |
Net income available to common stockholders/unitholders | $ 83,764 | $ 82,444 | $ 281,714 | $ 340,735
Weighted average number of shares/common units outstanding during the period (in shares) | 68,325,091 | 68,246,008 | 68,321,153 | 68,011,123
Net income available to common stockholders/unitholders (in dollars per share) | $ 1.23 | $ 1.21 | $ 4.12 | $ 5.01
Diluted: |  |  |  |
Net income available to common stockholders/unitholders | $ 83,764 | $ 82,444 | $ 281,714 | $ 340,735
Net income available to common stockholders/unitholders, weighted average common shares (in shares) | 68,376,795 | 68,329,395 | 68,366,167 | 68,088,638
Net income available to common stockholders/unitholders (in dollars per share) | $ 1.23 | $ 1.21 | $ 4.12 | $ 5.00
Employee Stock Option [Member] |  |  |  |
Basic: |  |  |  |
Income effect of Dilutive Securities | $ 0 | $ 0 | $ 0 | $ 0
Effect of dilutive securities (in shares) | 51,704 | 83,387 | 45,014 | 77,515
Diluted: |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 150,852 | 0 | 160,252 | 2,352
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) | 51,704 | 83,387 | 45,014 | 77,515
Diluted: |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 150,852 | 0 | 160,252 | 2,352
Convertible Limited Partnership Units [Member] |  |  |  |
Diluted: |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 2,272,983 | 2,251,112 | 2,273,163 | 2,251,673
Antidilutive securities excluded from computation of earnings per share, value | $ 2,800 | $ 2,700 | $ 9,400 | $ 11,300

X
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