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
	Mar. 31, 2025	Mar. 31, 2024
Basic:
Net income available to common stockholders	$ 203,110	$ 272,731
Weighted average common shares/units (in shares)	64,314,899	64,205,086
Per common share/unit amount (in dollars per share)	$ 3.16	$ 4.25
Diluted:
Net income available to common stockholders/unitholders	$ 203,110	$ 272,731
Weighted average common shares/units (in shares)	64,349,899	64,212,006
Per common share/unit amount (in dollars per share)	$ 3.16	$ 4.25
Essex Portfolio, L.P.
Basic:
Net income available to common stockholders	$ 210,389	$ 282,330
Weighted average common shares/units (in shares)	66,621,852	66,463,899
Per common share/unit amount (in dollars per share)	$ 3.16	$ 4.25
Diluted:
Net income available to common stockholders/unitholders	$ 210,389	$ 282,330
Weighted average common shares/units (in shares)	66,656,852	66,470,819
Per common share/unit amount (in dollars per share)	$ 3.16	$ 4.25
Stock options
Basic:
Effect of dilutive securities	$ 0	$ 0
Effect of dilutive securities (in shares)	35,000	6,920
Stock options | Essex Portfolio, L.P.
Basic:
Effect of dilutive securities	$ 0	$ 0
Effect of dilutive securities (in shares)	35,000	6,920