Organization and Basis of Presentation - Accumulated Other Comprehensive Income (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	$ 5,895,116
Balance at period end	5,762,005
Accumulated Other Comprehensive Loss, Net
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	46,466
Balance at period end	51,385
Change in fair value and amortization of swap settlements
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	46,466
Other comprehensive income before reclassification	4,909
Amounts reclassified from accumulated other comprehensive income	10
Other comprehensive income	4,919
Balance at period end	51,385
Essex Portfolio, L.P. | Change in fair value and amortization of swap settlements
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	52,010
Other comprehensive income before reclassification	5,082
Amounts reclassified from accumulated other comprehensive income	10
Other comprehensive income	5,092
Balance at period end	$ 57,102