Summary of Critical and Significant Accounting Policies - AOCI (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at period beginning	$ 6,176,508
Other comprehensive income before reclassification	52,555
Amounts reclassified from accumulated other comprehensive loss	(537)
Other comprehensive income	52,018
Balance at period end	5,895,116
Essex Portfolio, L.P.
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income before reclassification	54,371
Amounts reclassified from accumulated other comprehensive loss	(557)
Other comprehensive income	53,814
Accumulated other comprehensive income (loss), net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at period beginning	(5,552)
Balance at period end	46,466
Accumulated other comprehensive income (loss), net | Essex Portfolio, L.P.
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at period beginning	(1,804)
Balance at period end	52,010
Change in fair value and amortization of swap settlements
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at period beginning	(5,912)
Other comprehensive income before reclassification	52,331
Amounts reclassified from accumulated other comprehensive loss	20
Other comprehensive income	52,351
Balance at period end	46,439
Change in fair value and amortization of swap settlements | Essex Portfolio, L.P.
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at period beginning	(2,176)
Other comprehensive income before reclassification	54,138
Amounts reclassified from accumulated other comprehensive loss	20
Other comprehensive income	54,158
Balance at period end	51,982
Unrealized gain on available for sale securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at period beginning	360
Other comprehensive income before reclassification	224
Amounts reclassified from accumulated other comprehensive loss	(557)
Other comprehensive income	(333)
Balance at period end	27
Unrealized gain on available for sale securities | Essex Portfolio, L.P.
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at period beginning	372
Other comprehensive income before reclassification	233
Amounts reclassified from accumulated other comprehensive loss	(577)
Other comprehensive income	(344)
Balance at period end	$ 28