Equity, Capital and Other Interests - Issued and Outstanding Preferred Shares and Preference Units (Details) - EQR and ERPOP [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Class Of Stock [Line Items]
8.29% Series K Cumulative Redeemable Preferred Shares/Preference Units; liquidation value $50 per share/unit; 343,100 shares/units issued and outstanding as of March 31, 2024 and 745,600 share/units issued and outstanding as of December 31, 2023	$ 17,155	$ 37,280
Preferred Stock
Class Of Stock [Line Items]
Preferred Stocks Preference Units Call Date	Dec. 10, 2026
Annual Dividend Per Preferred Share Preference Unit	$ 4.145
8.29% Series K Cumulative Redeemable Preferred Shares/Preference Units; liquidation value $50 per share/unit; 343,100 shares/units issued and outstanding as of March 31, 2024 and 745,600 share/units issued and outstanding as of December 31, 2023	$ 17,155	$ 37,280