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Equity, Capital and Other Interests (Tables) | 9 Months Ended
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Sep. 30, 2021
Class Of Stock [Line Items] |
Changes in Issued and Outstanding Common Shares and Units | The following table presents the changes in the Company’s issued and outstanding Common Shares and Units for the nine months ended September 30, 2021 and 2020:
|  | 2021 |  |  | 2020 |
Common Shares |  |  |  |  |  |  |  |
Common Shares outstanding at January 1, |  |  | 372,302,000 |  |  |  | 371,670,884 |
Common Shares Issued: |  |  |  |  |  |  |  |
Conversion of OP Units |  |  | 1,153,963 |  |  |  | 99,737 |
Exercise of share options |  |  | 1,401,755 |  |  |  | 219,922 |
Employee Share Purchase Plan (ESPP) |  |  | 59,297 |  |  |  | 69,986 |
Restricted share grants, net |  |  | 85,573 |  |  |  | 178,720 |
Common Shares outstanding at September 30, |  |  | 375,002,588 |  |  |  | 372,239,249 |
Units |  |  |  |  |  |  |  |
Units outstanding at January 1, |  |  | 13,858,073 |  |  |  | 13,731,315 |
Restricted unit grants, net |  |  | 155,638 |  |  |  | 247,822 |
Conversion of OP Units to Common Shares |  |  | (1,153,963 | ) |  |  | (99,737 | )
Units outstanding at September 30, |  |  | 12,859,748 |  |  |  | 13,879,400 |
Total Common Shares and Units outstanding at September 30, |  |  | 387,862,336 |  |  |  | 386,118,649 |
Units Ownership Interest in Operating Partnership |  |  | 3.3 | % |  |  | 3.6 | %
Changes in Redemption Value of Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners | The following table presents the changes in the redemption value of the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners for the nine months ended September 30, 2021 and 2020, respectively (amounts in thousands):
|  | 2021 |  |  | 2020 |
Balance at January 1, |  | $ | 338,951 |  |  | $ | 463,400 |
Change in market value |  |  | 119,237 |  |  |  | (169,825 | )
Change in carrying value |  |  | 1,745 |  |  |  | 131 |
Balance at September 30, |  | $ | 459,933 |  |  | $ | 293,706 |
Issued and Outstanding Preferred Shares and Preference Units | The following table presents the Company’s issued and outstanding Preferred Shares/Preference Units as of September 30, 2021 and December 31, 2020:
|  |  |  |  |  |  |  | Amounts in thousands |
|  |  |  | Annual |  |  |  |  |  |  |  |  |
|  | Call |  | Dividend Per |  |  | September 30, |  |  | December 31, |
|  | Date (1) |  | Share/Unit (2) |  |  | 2021 |  |  | 2020 |
Preferred Shares/Preference Units of beneficial interest, $0.01 par value; 100,000,000 shares authorized: |  |  |  |  |  |  |  |  |  |  |  |  |  |
8.29% Series K Cumulative Redeemable Preferred Shares/Preference Units; liquidation value $50 per share/unit; 745,600 shares/units issued and outstanding as of September 30, 2021 and December 31, 2020 |  | 12/10/26 |  | $ | 4.145 |  |  | $ | 37,280 |  |  | $ | 37,280 |
|  |  |  |  |  |  |  | $ | 37,280 |  |  | $ | 37,280 |
(1) | On or after the call date, redeemable Preferred Shares/Preference Units may be redeemed for cash at the option of the Company or the Operating Partnership, respectively, in whole or in part, at a redemption price equal to the liquidation price per share/unit, plus accrued and unpaid distributions, if any.
(2) | Dividends on Preferred Shares/Preference Units are payable quarterly.
ERPOP [Member] |
Class Of Stock [Line Items] |
Changes in Issued and Outstanding Common Shares and Units | The following table presents the changes in the Operating Partnership’s issued and outstanding General Partner Units and Limited Partner Units for the nine months ended September 30, 2021 and 2020:
|  | 2021 |  |  | 2020 |
General and Limited Partner Units |  |  |  |  |  |  |  |
General and Limited Partner Units outstanding at January 1, |  |  | 386,160,073 |  |  |  | 385,402,199 |
Issued to General Partner: |  |  |  |  |  |  |  |
Exercise of EQR share options |  |  | 1,401,755 |  |  |  | 219,922 |
EQR’s Employee Share Purchase Plan (ESPP) |  |  | 59,297 |  |  |  | 69,986 |
EQR’s restricted share grants, net |  |  | 85,573 |  |  |  | 178,720 |
Issued to Limited Partners: |  |  |  |  |  |  |  |
Restricted unit grants, net |  |  | 155,638 |  |  |  | 247,822 |
General and Limited Partner Units outstanding at September 30, |  |  | 387,862,336 |  |  |  | 386,118,649 |
Limited Partner Units |  |  |  |  |  |  |  |
Limited Partner Units outstanding at January 1, |  |  | 13,858,073 |  |  |  | 13,731,315 |
Limited Partner restricted unit grants, net |  |  | 155,638 |  |  |  | 247,822 |
Conversion of Limited Partner OP Units to EQR Common Shares |  |  | (1,153,963 | ) |  |  | (99,737 | )
Limited Partner Units outstanding at September 30, |  |  | 12,859,748 |  |  |  | 13,879,400 |
Limited Partner Units Ownership Interest in Operating Partnership |  |  | 3.3 | % |  |  | 3.6 | %

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