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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Basic [Abstract] |  |  |  |
Income from discontinued operations available to common stockholders | $ 65,561 | $ 42,323 | $ 215,555 | $ 147,241
Weighted average number of shares outstanding during the period (in shares) | 65,507,669 | 65,138,868 | 65,455,004 | 64,714,994
Net income available to common stockholders (in dollars per share) | $ 1.00 | $ 0.65 | $ 3.29 | $ 2.28
Effect of dilutive securities | $ 0 | $ 0 | $ 0 | $ 0
Effect of dilutive securities (in shares) | 109,882 | 158,682 | 123,657 | 177,776
Diluted [Abstract] |  |  |  |
Income from continuing operations available to common stockholders | $ 65,561 | $ 42,323 | $ 215,555 | $ 147,241
Adjusted income from continuing operations available to common stockholders (in shares) | 65,617,551 | 65,297,550 | 65,578,661 | 64,892,770
Net income available to common stockholders (in dollars per share) | $ 1.00 | $ 0.65 | $ 3.29 | $ 2.27
Essex Portfolio, L.P. [Member] |  |  |  |
Basic [Abstract] |  |  |  |
Income from discontinued operations available to common stockholders | $ 67,784 | $ 43,794 | $ 223,012 | $ 152,356
Weighted average number of shares outstanding during the period (in shares) | 67,728,621 | 67,316,498 | 67,679,240 | 66,896,293
Net income available to common stockholders (in dollars per share) | $ 1.00 | $ 0.65 | $ 3.30 | $ 2.28
Effect of dilutive securities | $ 0 | $ 0 | $ 0 | $ 0
Effect of dilutive securities (in shares) | 109,882 | 158,682 | 123,657 | 177,776
Diluted [Abstract] |  |  |  |
Income from continuing operations available to common stockholders | $ 67,784 | $ 43,794 | $ 223,012 | $ 152,356
Adjusted income from continuing operations available to common stockholders (in shares) | 67,838,503 | 67,475,180 | 67,802,897 | 67,074,069
Net income available to common stockholders (in dollars per share) | $ 1.00 | $ 0.65 | $ 3.29 | $ 2.27
Convertible Limited Partnership Units [Member] |  |  |  |
Diluted [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount | 2,220,952 | 2,177,630 | 2,224,236 | 2,181,299
Antidilutive securities excluded from computation of earnings per share, value | $ 2,200 | $ 1,500 | $ 7,500 | $ 5,100
Employee Stock Option [Member] |  |  |  |
Diluted [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount | 40,900 | 24,500 | 76,054 | 24,500
Employee Stock Option [Member] | Essex Portfolio, L.P. [Member] |  |  |  |
Diluted [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount | 40,900 | 24,500 | 76,054 | 24,500

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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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- Definition Net Income or Loss 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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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721525-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721523-107759 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e957-107759 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1012-107759 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 + Details
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