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Condensed Consolidated Statement of Capital - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	$ 86,110	$ 289,159
Reversal of unrealized losses upon the sale of marketable debt securities		6
Change in fair value of derivatives and amortization of swap settlements		12,630
Change in fair value of marketable debt securities, net		(87)
Issuance of common stock under:
Sale of common stock by general partner, net		(483)
Retirement of common units, net		(3,774)
Changes in the redemption value of redeemable noncontrolling interest		(2,253)
Distributions to noncontrolling interest		(22,281)
Redemptions		(157)
ASU 2016-01 [Member]
Issuance of common stock under:
Cumulative effect upon adoption			$ 0
ASU 2017-05 [Member]
Issuance of common stock under:
Cumulative effect upon adoption			123,708
Essex Portfolio, L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance at period beginning		6,396,825
Net income	86,110	289,159
Reversal of unrealized losses upon the sale of marketable debt securities		6
Change in fair value of derivatives and amortization of swap settlements		12,630
Change in fair value of marketable debt securities, net		(87)
Issuance of common stock under:
General partner's stock based compensation, net		2,751
Sale of common stock by general partner, net		(483)
Equity based compensation costs		8,561
Retirement of common units, net		(3,774)
Changes in the redemption value of redeemable noncontrolling interest		(2,253)
Distributions to noncontrolling interest		(9,522)
Redemptions		(157)
Distributions declared		(381,336)
Balance at period end	6,436,028	6,436,028
Essex Portfolio, L.P. [Member] \| ASU 2016-01 [Member]
Issuance of common stock under:
Cumulative effect upon adoption			0
Essex Portfolio, L.P. [Member] \| ASU 2017-05 [Member]
Issuance of common stock under:
Cumulative effect upon adoption			123,708
Essex Portfolio, L.P. [Member] \| Common Equity [Member] \| General Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance at period beginning		$ 6,295,852
Balance at period beginning (in units)		66,054
Net income		$ 272,333
Issuance of common stock under:
General partner's stock based compensation, net		$ 2,751
General partner's stock based compensation, net (in units)		17
Sale of common stock by general partner, net		$ (483)
Equity based compensation costs		7,697
Retirement of common units, net		$ (3,774)
Retirement of common units, net (in shares)		(17)
Changes in the redemption value of redeemable noncontrolling interest		$ (2,032)
Redemptions		$ (143)
Redemptions (in units)		1
Distributions declared		$ (368,577)
Balance at period end	$ 6,325,509	$ 6,325,509
Balance at period end (in units)	66,055	66,055
Essex Portfolio, L.P. [Member] \| Common Equity [Member] \| General Partner [Member] \| ASU 2016-01 [Member]
Issuance of common stock under:
Cumulative effect upon adoption			2,234
Essex Portfolio, L.P. [Member] \| Common Equity [Member] \| General Partner [Member] \| ASU 2017-05 [Member]
Issuance of common stock under:
Cumulative effect upon adoption			119,651
Essex Portfolio, L.P. [Member] \| Common Equity [Member] \| Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance at period beginning		$ 49,792
Balance at period beginning (in units)		2,268
Net income		$ 9,381
Issuance of common stock under:
Equity based compensation costs		$ 864
Equity based compensation costs (in units)		5
Changes in the redemption value of redeemable noncontrolling interest		$ (233)
Redemptions		(3)
Distributions declared		(12,759)
Balance at period end	$ 51,093	$ 51,093
Balance at period end (in units)	2,273	2,273
Essex Portfolio, L.P. [Member] \| Common Equity [Member] \| Limited Partner [Member] \| ASU 2016-01 [Member]
Issuance of common stock under:
Cumulative effect upon adoption			(6)
Essex Portfolio, L.P. [Member] \| Common Equity [Member] \| Limited Partner [Member] \| ASU 2017-05 [Member]
Issuance of common stock under:
Cumulative effect upon adoption			4,057
Essex Portfolio, L.P. [Member] \| Accumulated Other Comprehensive Loss [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance at period beginning		$ (15,229)
Reversal of unrealized losses upon the sale of marketable debt securities		6
Change in fair value of derivatives and amortization of swap settlements		12,630
Change in fair value of marketable debt securities, net		(87)
Issuance of common stock under:
Cumulative effect upon adoption			(2,228)
Balance at period end	$ (4,908)	(4,908)
Essex Portfolio, L.P. [Member] \| Accumulated Other Comprehensive Loss [Member] \| ASU 2016-01 [Member]
Issuance of common stock under:
Cumulative effect upon adoption			$ (2,228)
Essex Portfolio, L.P. [Member] \| Noncontrolling Interest [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance at period beginning		66,410
Net income		7,445
Issuance of common stock under:
Changes in the redemption value of redeemable noncontrolling interest		12
Distributions to noncontrolling interest		(9,522)
Redemptions		(11)
Balance at period end	$ 64,334	$ 64,334