Debt - Schedule of Debt and Lines of Credit (Details) $ in Thousands	1 Months Ended	6 Months Ended	12 Months Ended
	May 31, 2025 USD ($) extensionOption	Jun. 30, 2025 USD ($) lineOfCredit extensionOption	Dec. 31, 2024 USD ($) lineOfCredit	Apr. 30, 2025 USD ($)	Feb. 28, 2025 USD ($)
Debt Instrument [Line Items]
Unsecured debt, net		$ 5,519,922	$ 5,473,788
Mortgage notes payable, net		874,532	989,884
Total debt, net		6,759,454	6,601,617
Debt instrument face amount		450,000
Long-term debt		6,427,181
Commercial Paper
Debt Instrument [Line Items]
Debt instrument, term	397 days
Essex Portfolio, L.P.
Debt Instrument [Line Items]
Unsecured debt, net		5,519,922	5,473,788
Mortgage notes payable, net		874,532	989,884
Interest Rate Swap
Debt Instrument [Line Items]
Derivative hedged item	$ 150,000	47,500
Interest rate	4.10%
Unsecured debt
Debt Instrument [Line Items]
Unsecured debt, net		5,519,922	$ 5,473,788
Unsecured Term Loan 0.850%, Due May 2028
Debt Instrument [Line Items]
Number of extension options (in extensions) | extensionOption	2
Extension period	1 year
Commerical Paper Program | Commercial Paper
Debt Instrument [Line Items]
Debt instrument face amount	$ 750,000
Unamortized debt issuance expense		$ 100
Debt instrument, term	397 days
Term loan - variable rate, net
Debt Instrument [Line Items]
Weighted average interest rate		4.20%	4.20%
Term loan - variable rate, net | Unsecured debt
Debt Instrument [Line Items]
Term loan - variable rate		$ 447,305	$ 298,571
Weighted average maturity		3 years 2 months 12 days
Bonds public offering - fixed rate, net
Debt Instrument [Line Items]
Unamortized discount (premium), net		$ 1,000	(100)
Unamortized debt issuance expense		29,100	26,300
Bonds public offering - fixed rate, net | Essex Portfolio, L.P.
Debt Instrument [Line Items]
Unsecured notes at maturity				$ 500,000
Bonds public offering - fixed rate, net | Unsecured debt
Debt Instrument [Line Items]
Unsecured debt, net		$ 5,072,617	5,175,217
Weighted average maturity		7 years 4 months 24 days
Bonds public offering - fixed rate, net | Unsecured Bonds 5.500%, Due March 2028 | Essex Portfolio, L.P.
Debt Instrument [Line Items]
Debt instrument face amount					$ 400,000
Bonds public offering - fixed rate, net | Unsecured Bonds 5.500%, Due March 2028 | Essex Portfolio, L.P.
Debt Instrument [Line Items]
Interest rate					5.375%
Debt instrument, debt offering price, percentage of principal					99.604%
Lines of credit
Debt Instrument [Line Items]
Lines of credit and commercial paper		$ 0	$ 137,945
Weighted average interest rate		5.30%	5.70%
Commercial Paper
Debt Instrument [Line Items]
Commercial paper		$ 365,000	$ 0
Weighted average interest rate		4.60%
Mortgage notes payable, net
Debt Instrument [Line Items]
Mortgage notes payable, net		$ 874,532	$ 989,884
Weighted average interest rate		4.20%	4.20%
Weighted average maturity		6 years 4 months 24 days
Unamortized discount (premium), net		$ 400	$ 200
Unamortized debt issuance expense		$ 2,300	$ 2,600
Weighted average interest rate on fixed rate unsecured bonds public offering
Debt Instrument [Line Items]
Weighted average interest rate		3.60%	3.40%
Unsecured debt | Unsecured Term Loan 0.850%, Due May 2028
Debt Instrument [Line Items]
Debt instrument face amount	$ 300,000
Interest rate	0.85%
Long-term debt		$ 150,000
Unsecured debt | Unsecured Term Loan 0.850%, Due May 2028 | Maximum
Debt Instrument [Line Items]
Debt instrument face amount	$ 600,000
Unsecured debt | New Credit Facility | Lines of credit
Debt Instrument [Line Items]
Debt instrument face amount		$ 1,280,000	$ 1,280,000
Interest rate	0.775%
Number of extension options (in extensions) | extensionOption		2
Extension period		6 months
Unamortized debt issuance expense		$ 5,300	$ 6,200
Numbers of line of credit | lineOfCredit		2	2
Aggregate borrowing capacity	$ 1,500,000	$ 1,200,000		$ 1,200,000
Debt instrument, variable interest rate, type [extensible enumeration]		Secured Overnight Financing Rate (SOFR) [Member]
Basis spread on variable rate		0.765%
Line of credit facility increase amount	1,000,000
Unsecured debt | New Credit Facility | Lines of credit | Maximum
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 2,500,000
Unsecured debt | Working capital line of credit | Lines of credit
Debt Instrument [Line Items]
Aggregate borrowing capacity		$ 75,000
Basis spread on variable rate		0.765%