Organization and Basis of Presentation - Schedule of Changes in Accumulated Other Comprehensive Income, Net by Component (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	$ 5,720,390
Balance at period end	5,801,527
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	24,655
Other comprehensive (loss) income before reclassification	(20,619)
Amounts reclassified from accumulated other comprehensive income	3,820
Other comprehensive (loss) income	(16,799)
Balance at period end	7,856
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	24,655
Other comprehensive (loss) income before reclassification	(20,813)
Amounts reclassified from accumulated other comprehensive income	3,836
Other comprehensive (loss) income	(16,977)
Balance at period end	7,678
Unrealized gain on available for sale debt securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	0
Other comprehensive (loss) income before reclassification	194
Amounts reclassified from accumulated other comprehensive income	(16)
Other comprehensive (loss) income	178
Balance at period end	178
Essex Portfolio, L.P. | Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	29,429
Other comprehensive (loss) income before reclassification	(21,341)
Amounts reclassified from accumulated other comprehensive income	3,954
Other comprehensive (loss) income	(17,387)
Balance at period end	12,042
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	29,429
Other comprehensive (loss) income before reclassification	(21,542)
Amounts reclassified from accumulated other comprehensive income	3,971
Other comprehensive (loss) income	(17,571)
Balance at period end	11,858
Essex Portfolio, L.P. | Unrealized gain on available for sale debt securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	0
Other comprehensive (loss) income before reclassification	201
Amounts reclassified from accumulated other comprehensive income	(17)
Other comprehensive (loss) income	184
Balance at period end	$ 184