Net Income Per Common Share and Net Income Per Common Unit - Schedule of Net Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Basic:
Net income available to common stockholders/unitholders	$ 62,462	$ 221,362	$ 168,648	$ 424,472
Weighted average common shares/units (in shares)	64,265,835	64,385,988	64,359,851	64,350,640
Per common share/unit amount (in dollars per share)	$ 0.97	$ 3.44	$ 2.62	$ 6.60
Diluted:
Net income available to common stockholders/unitholders	$ 62,462	$ 221,362	$ 168,648	$ 424,472
Weighted average common shares/units (in shares)	64,279,012	64,407,613	64,369,794	64,378,953
Per common share/unit amount (in dollars per share)	$ 0.97	$ 3.44	$ 2.62	$ 6.59
Essex Portfolio, L.P.
Basic:
Net income available to common stockholders/unitholders	$ 64,585	$ 229,143	$ 174,440	$ 439,532
Weighted average common shares/units (in shares)	66,449,797	66,649,159	66,565,211	66,635,581
Per common share/unit amount (in dollars per share)	$ 0.97	$ 3.44	$ 2.62	$ 6.60
Diluted:
Net income available to common stockholders/unitholders	$ 64,585	$ 229,143	$ 174,440	$ 439,532
Weighted average common shares/units (in shares)	66,462,974	66,670,784	66,575,154	66,663,894
Per common share/unit amount (in dollars per share)	$ 0.97	$ 3.44	$ 2.62	$ 6.59
Stock options
Basic:
Effect of dilutive securities	$ 0	$ 0	$ 0	$ 0
Effect of dilutive securities (in shares)	13,177	21,625	9,943	28,313
Stock options | Essex Portfolio, L.P.
Basic:
Effect of dilutive securities	$ 0	$ 0	$ 0	$ 0
Effect of dilutive securities (in shares)	13,177	21,625	9,943	28,313