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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Basic:
Net income available to common stockholders	$ 221,362	$ 92,914	$ 424,472	$ 365,645
Weighted average common shares/units (in shares)	64,385,988	64,209,878	64,350,640	64,207,482
Per common share/unit amount (in dollars per share)	$ 3.44	$ 1.45	$ 6.60	$ 5.69
Diluted:
Net income available to common stockholders/unitholders	$ 221,362	$ 92,914	$ 424,472	$ 365,645
Weighted average common shares/units (in shares)	64,407,613	64,227,651	64,378,953	64,218,911
Per common share/unit amount (in dollars per share)	$ 3.44	$ 1.45	$ 6.59	$ 5.69
Essex Portfolio, L.P.
Basic:
Net income available to common stockholders	$ 229,143	$ 96,184	$ 439,532	$ 378,514
Weighted average common shares/units (in shares)	66,649,159	66,468,691	66,635,581	66,466,295
Per common share/unit amount (in dollars per share)	$ 3.44	$ 1.45	$ 6.60	$ 5.69
Diluted:
Net income available to common stockholders/unitholders	$ 229,143	$ 96,184	$ 439,532	$ 378,514
Weighted average common shares/units (in shares)	66,670,784	66,486,464	66,663,894	66,477,724
Per common share/unit amount (in dollars per share)	$ 3.44	$ 1.45	$ 6.59	$ 5.69
Stock options
Basic:
Effect of dilutive securities	$ 0	$ 0	$ 0	$ 0
Effect of dilutive securities (in shares)	21,625	17,773	28,313	11,429
Stock options | Essex Portfolio, L.P.
Basic:
Effect of dilutive securities	$ 0	$ 0	$ 0	$ 0
Effect of dilutive securities (in shares)	21,625	17,773	28,313	11,429