Summary of Critical and Significant Accounting Policies - Schedule of Changes in Accumulated Other Comprehensive Income, Net by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 5,720,390	$ 5,593,978	$ 5,895,116
Total other comprehensive loss	(19,291)	(9,217)	(13,364)
Ending balance	5,708,632	5,720,390	5,593,978
Essex Portfolio, L.P.
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total other comprehensive loss	(19,291)	(9,217)	$ (13,364)
Change in fair value of derivatives and amortization of swap settlements
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	24,655
Other comprehensive (loss) income before reclassification	(23,990)
Amounts reclassified from accumulated other comprehensive income	5,172
Total other comprehensive loss	(18,818)
Ending balance	5,837	24,655
Change in fair value of derivatives and amortization of swap settlements | Essex Portfolio, L.P.
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	29,429
Other comprehensive (loss) income before reclassification	(24,863)
Amounts reclassified from accumulated other comprehensive income	5,355
Total other comprehensive loss	(19,508)
Ending balance	9,921	29,429
Unrealized gain on available for sale debt securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0
Other comprehensive (loss) income before reclassification	236
Amounts reclassified from accumulated other comprehensive income	(26)
Total other comprehensive loss	210
Ending balance	210	0
Unrealized gain on available for sale debt securities | Essex Portfolio, L.P.
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0
Other comprehensive (loss) income before reclassification	244
Amounts reclassified from accumulated other comprehensive income	(27)
Total other comprehensive loss	217
Ending balance	217	0
AOCI Including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	24,655
Other comprehensive (loss) income before reclassification	(23,754)
Amounts reclassified from accumulated other comprehensive income	5,146
Total other comprehensive loss	(18,608)
Ending balance	6,047	24,655
AOCI Including Portion Attributable to Noncontrolling Interest | Essex Portfolio, L.P.
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	29,429
Other comprehensive (loss) income before reclassification	(24,619)
Amounts reclassified from accumulated other comprehensive income	5,328
Total other comprehensive loss	(19,291)
Ending balance	$ 10,138	$ 29,429