Organization and Basis of Presentation - Schedule of Changes in Accumulated Other Comprehensive Income, Net by Component (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2026 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	$ 5,708,632
Balance at period end	5,459,454
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	6,047
Other comprehensive income (loss) before reclassification	19,439
Amounts reclassified from accumulated other comprehensive income	1,940
Other comprehensive income (loss)	21,379
Balance at period end	27,426
Change in Fair Value of Derivatives and Amortization of Swap Settlements
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	5,837
Other comprehensive income (loss) before reclassification	20,808
Amounts reclassified from accumulated other comprehensive income	1,983
Other comprehensive income (loss)	22,791
Balance at period end	28,628
Unrealized Gain (Loss) on Available for Sale Debt Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	210
Other comprehensive income (loss) before reclassification	(1,369)
Amounts reclassified from accumulated other comprehensive income	(43)
Other comprehensive income (loss)	(1,412)
Balance at period end	(1,202)
Essex Portfolio, L.P. | Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	10,138
Other comprehensive income (loss) before reclassification	20,099
Amounts reclassified from accumulated other comprehensive income	2,009
Other comprehensive income (loss)	22,108
Balance at period end	32,246
Essex Portfolio, L.P. | Change in Fair Value of Derivatives and Amortization of Swap Settlements
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	9,921
Other comprehensive income (loss) before reclassification	21,517
Amounts reclassified from accumulated other comprehensive income	2,052
Other comprehensive income (loss)	23,569
Balance at period end	33,490
Essex Portfolio, L.P. | Unrealized Gain (Loss) on Available for Sale Debt Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	217
Other comprehensive income (loss) before reclassification	(1,418)
Amounts reclassified from accumulated other comprehensive income	(43)
Other comprehensive income (loss)	(1,461)
Balance at period end	$ (1,244)