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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Basic [Abstract] |  |  |  |
Income from discontinued operations available to common stockholders | $ 72,013 | $ 45,555 | $ 149,994 | $ 104,918
Weighted average number of shares outstanding during the period (in shares) | 65,451,110 | 64,810,184 | 65,428,382 | 64,499,545
Net income available to common stockholders (in dollars per share) | $ 1.10 | $ 0.70 | $ 2.29 | $ 1.63
Effect of dilutive securities | $ 0 | $ 0 | $ 0 | $ 0
Effect of dilutive securities (in shares) | 124,268 | 162,668 | 130,429 | 177,976
Diluted [Abstract] |  |  |  |
Income from continuing operations available to common stockholders | $ 72,013 | $ 45,555 | $ 149,994 | $ 104,918
Adjusted income from continuing operations available to common stockholders (in shares) | 65,575,378 | 64,972,852 | 65,558,811 | 64,677,521
Net income available to common stockholders (in dollars per share) | $ 1.10 | $ 0.70 | $ 2.29 | $ 1.62
Essex Portfolio, L.P. [Member] |  |  |  |
Basic [Abstract] |  |  |  |
Income from discontinued operations available to common stockholders | $ 74,463 | $ 47,088 | $ 155,228 | $ 108,514
Weighted average number of shares outstanding during the period (in shares) | 67,675,038 | 66,992,209 | 67,654,279 | 66,682,708
Net income available to common stockholders (in dollars per share) | $ 1.10 | $ 0.70 | $ 2.29 | $ 1.63
Effect of dilutive securities | $ 0 | $ 0 | $ 0 | $ 0
Effect of dilutive securities (in shares) | 124,268 | 162,668 | 130,429 | 177,976
Diluted [Abstract] |  |  |  |
Income from continuing operations available to common stockholders | $ 74,463 | $ 47,088 | $ 155,228 | $ 108,514
Adjusted income from continuing operations available to common stockholders (in shares) | 67,799,306 | 67,154,877 | 67,784,708 | 66,860,684
Net income available to common stockholders (in dollars per share) | $ 1.10 | $ 0.70 | $ 2.29 | $ 1.62
Convertible Limited Partnership Units [Member] |  |  |  |
Diluted [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount | 2,223,928 | 2,182,025 | 2,225,897 | 2,183,163
Antidilutive securities excluded from computation of earnings per share, value | $ 2,400 | $ 1,600 | $ 5,200 | $ 3,600
DownREIT Units [Member] [Member] |  |  |  |
Diluted [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount | 953,006 |  |  |
DownREIT Units [Member] [Member] | Essex Portfolio, L.P. [Member] |  |  |  |
Diluted [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount | 953,006 |  |  |
Employee Stock Option [Member] |  |  |  |
Diluted [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount | 87,954 | 24,500 | 87,954 | 36,956
Employee Stock Option [Member] | Essex Portfolio, L.P. [Member] |  |  |  |
Diluted [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount | 87,954 | 24,500 | 87,954 | 36,956

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- Definition Net Income or Loss (in shares) from continued operations available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References No definition available. + Details
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