Summary of Critical and Significant Accounting Policies - AOCI (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at period beginning	$ 5,593,978
Balance at period end	5,720,390
Accumulated other comprehensive income (loss), net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at period beginning	33,556
Balance at period end	24,655
Change in fair value and amortization of swap settlements
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at period beginning	33,556
Other comprehensive loss before reclassification	(8,955)
Amounts reclassified from accumulated other comprehensive loss	54
Other comprehensive loss	(8,901)
Balance at period end	24,655
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	38,646
Other comprehensive loss before reclassification	(9,273)
Amounts reclassified from accumulated other comprehensive loss	56
Other comprehensive loss	(9,217)
Balance at period end	$ 29,429