Significant Transactions During the Six Months Ended June 30, 2025 and Subsequent Events - Narrative (Details) $ in Thousands	1 Months Ended				3 Months Ended				6 Months Ended
	Jul. 30, 2025 USD ($)	May 31, 2025 USD ($) extensionOption	Apr. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025	Jun. 30, 2025 USD ($) community property	Dec. 31, 2024 USD ($) apartment	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) community property	Jun. 30, 2024 USD ($)	Jul. 31, 2025 USD ($) apartment	Feb. 28, 2025 USD ($)
Other Commitments [Line Items]
Number of communities owned | community						1			1
Community apartment homes | property						243			243
Proceeds from preferred equity investment			$ 14,100	$ 9,900					$ 29,358	$ 21,493
Co-investments						$ 895,821	$ 935,014		895,821
Gain on remeasurement of co-investment						0		$ 0	330	138,326
Debt instrument face amount						450,000			450,000
Long-term debt						6,427,181			6,427,181
Debt associated with the property									615,502	401,533
Payments to acquire equity method investments									8,727	3,804
Proceeds from dispositions of real estate									364,155	0
Subsequent Event
Other Commitments [Line Items]
Proceeds from dispositions of real estate	$ 97,500
Essex Portfolio, L.P.
Other Commitments [Line Items]
Proceeds from preferred equity investment									29,358	21,493
Co-investments						895,821	935,014		895,821
Gain on remeasurement of co-investment						0		$ 0	330	138,326
Debt associated with the property									615,502	401,533
Payments to acquire equity method investments									8,727	3,804
Proceeds from dispositions of real estate									364,155	$ 0
Commercial Paper
Other Commitments [Line Items]
Debt instrument, term		397 days
Maximum amount authorized		$ 750,000
Interest Rate Swap
Other Commitments [Line Items]
Derivative hedged item		$ 150,000				47,500			47,500
Interest rate		4.10%
Unsecured Term Loan 0.850%, Due May 2028 | Unsecured debt
Other Commitments [Line Items]
Debt instrument face amount		$ 300,000
Interest rate		0.85%
Number of extensions | extensionOption		2
Option term		1 year
Long-term debt						150,000			150,000
Unsecured Term Loan 0.850%, Due May 2028 | Unsecured debt | Maximum
Other Commitments [Line Items]
Debt instrument face amount		$ 600,000
New Credit Facility | Unsecured debt | Lines of credit
Other Commitments [Line Items]
Debt instrument face amount						1,280,000	1,280,000		1,280,000
Interest rate		0.775%
Number of extensions | extensionOption		2
Option term		6 months
Aggregate borrowing capacity		$ 1,500,000	1,200,000			$ 1,200,000			$ 1,200,000
Line of credit facility increase amount		1,000,000
New Credit Facility | Unsecured debt | Lines of credit | Maximum
Other Commitments [Line Items]
Aggregate borrowing capacity		$ 2,500,000
Unsecured Bonds 5.500%, Due April 2034 | Unsecured debt | Essex Portfolio, L.P.
Other Commitments [Line Items]
Unsecured notes at maturity			$ 500,000
Debt instrument face amount												$ 400,000
Interest rate												5.375%
Debt instrument, debt offering price, percentage of principal												99.604%
Stabilized Apartment Home Community Located In Oakland
Other Commitments [Line Items]
Unsecured notes at maturity							72,000
Co-investments							$ 22,700
Apartment Homes | apartment							241
Value of property held							$ 95,000
Gain on remeasurement of co-investment							$ 300
Wesco VII LLC | Forecast
Other Commitments [Line Items]
Preferred return rate					13.50%
Wesco VII LLC | Subsequent Event
Other Commitments [Line Items]
Payments to acquire equity method investments	$ 50,000
Equity method investment, ownership percentage	50.00%
Preferred equity investment											$ 42,600
Number of units in real estate property | apartment											480