Summary of Critical and Significant Accounting Policies - AOCI (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at period beginning	$ 5,895,116
Balance at period end	5,593,978
Accumulated other comprehensive income (loss), net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at period beginning	46,466
Balance at period end	33,556
Change in fair value and amortization of swap settlements
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at period beginning	46,466
Other comprehensive loss before reclassification	(12,930)
Amounts reclassified from accumulated other comprehensive loss	20
Other comprehensive loss	(12,910)
Balance at period end	33,556
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	52,010
Other comprehensive loss before reclassification	(13,384)
Amounts reclassified from accumulated other comprehensive loss	20
Other comprehensive loss	(13,364)
Balance at period end	$ 38,646