Significant Transactions During the Nine Months Ended September 30, 2025 - Narrative (Details) $ in Thousands	1 Months Ended				3 Months Ended					9 Months Ended
	Aug. 31, 2025 USD ($)	Jul. 31, 2025 USD ($) apartment extensionOption	May 31, 2025 USD ($) extensionOption	Aug. 31, 2022 USD ($)	Sep. 30, 2025 USD ($) investment	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) apartment	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) investment	Sep. 30, 2024 USD ($)	Apr. 30, 2025 USD ($)	Feb. 28, 2025 USD ($)
Other Commitments [Line Items]
Payments to acquire equity method investments										$ 31,024	$ 4,977
Cash proceeds					$ 71,400
Number of investments with a commitment to fund | investment					3					3
Proceeds from preferred equity investment						$ 14,100	$ 9,900			$ 64,125	35,096
Co-investments					$ 808,238			$ 935,014		808,238
Gain on remeasurement of co-investment					0				$ 31,583	330	169,909
Debt instrument face amount					550,000					550,000
Long-term debt					6,448,334					$ 6,448,334
Related Party
Other Commitments [Line Items]
Notes receivable				$ 11,200
Notes receivable, interest rate				9.50%
Related Party Bridge Loan On Property Acquired By Wesco I | Related Party
Other Commitments [Line Items]
Notes receivable	$ 81,200
Notes receivable, interest rate	5.50%
Wesco VII LLC
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
Preferred return rate		13.50%
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
Preferred Equity Investment Property In Southern California And Washington
Other Commitments [Line Items]
Early redemption fee					$ 100
Number of investments with a commitment to fund | investment					1					1
Essex Portfolio, L.P.
Other Commitments [Line Items]
Payments to acquire equity method investments										$ 31,024	4,977
Proceeds from preferred equity investment										64,125	35,096
Co-investments					$ 808,238			935,014		808,238
Gain on remeasurement of co-investment					0				$ 31,583	330	$ 169,909
Interest Rate Swap
Other Commitments [Line Items]
Derivative hedged item			$ 247,500
Interest rate			4.10%
Commercial Paper
Other Commitments [Line Items]
Debt instrument, term			397 days
Maximum amount authorized			$ 750,000
Unsecured Term Loan 0.850%, Due May 2028 | Unsecured debt
Other Commitments [Line Items]
Interest rate			0.85%
Number of extensions | extensionOption			2
Option term			1 year
Debt instrument face amount			$ 300,000
Long-term debt					250,000					250,000
Unsecured Term Loan 0.850%, Due May 2028 | Unsecured debt | Maximum
Other Commitments [Line Items]
Debt instrument face amount			$ 600,000
Unsecured Bonds 5.375%, Due April 2035 | Unsecured debt | Essex Portfolio, L.P.
Other Commitments [Line Items]
Unsecured notes at maturity												$ 500,000
Interest rate													5.375%
Debt instrument face amount													$ 400,000
Debt instrument, debt offering price, percentage of principal													99.604%
Lines of credit | New Credit Facility | Unsecured debt
Other Commitments [Line Items]
Aggregate borrowing capacity		$ 1,200,000			1,500,000					1,500,000
Interest rate		0.775%
Number of extensions | extensionOption		2
Option term		6 months
Option to increase		$ 2,500,000
Line of credit facility increase amount		$ 1,000,000
Debt instrument face amount					$ 1,580,000			$ 1,280,000		$ 1,580,000