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Equity, Capital and Other Interests (Tables) | 9 Months Ended
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Sep. 30, 2018
Class Of Stock [Line Items] |
Changes in Issued and Outstanding Common Shares and Units | The following tables present the changes in the Company’s issued and outstanding Common Shares and “Units” (which includes OP Units and restricted units) for the nine months ended September 30, 2018:
|  | 2018 |
Common Shares |  |  |  |
Common Shares outstanding at January 1, |  |  | 368,018,082 |
Common Shares Issued: |  |  |  |
Conversion of OP Units |  |  | 12,510 |
Exercise of share options |  |  | 194,796 |
Employee Share Purchase Plan (ESPP) |  |  | 61,321 |
Restricted share grants, net |  |  | 122,877 |
Common Shares outstanding at September 30, |  |  | 368,409,586 |
Units |  |  |  |
Units outstanding at January 1, |  |  | 13,768,438 |
Restricted unit grants, net |  |  | 267,074 |
Conversion of OP Units to Common Shares |  |  | (12,510 | )
Units outstanding at September 30, |  |  | 14,023,002 |
Total Common Shares and Units outstanding at September 30, |  |  | 382,432,588 |
Units Ownership Interest in Operating Partnership |  |  | 3.7 | %
Changes in Redemption Value of Redeemable Noncontrolling Interests and Limited Partners Interest | The following table presents the changes in the redemption value of the Redeemable Noncontrolling Interests – Operating Partnership for the nine months ended September 30, 2018 (amounts in thousands):
|  | 2018 |
Balance at January 1, |  | $ | 366,955 |
Change in market value |  |  | 14,361 |
Change in carrying value |  |  | (77 | )
Balance at September 30, |  | $ | 381,239 |
Issued and Outstanding Preferred Shares and Preference Units | The following table presents the Company’s issued and outstanding Preferred Shares as of September 30, 2018 and December 31, 2017:
|  |  |  |  |  |  |  | Amounts in thousands |
|  |  |  | Annual |  |  |  |  |  |  |  |  |
|  | Call |  | Dividend Per |  |  | September 30, |  |  | December 31, |
|  | Date (1) |  | Share (2) |  |  | 2018 |  |  | 2017 |
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized: |  |  |  |  |  |  |  |  |  |  |  |  |  |
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of September 30, 2018 and December 31, 2017 |  | 12/10/26 |  | $ | 4.145 |  |  | $ | 37,280 |  |  | $ | 37,280 |
|  |  |  |  |  |  |  | $ | 37,280 |  |  | $ | 37,280 |
(1) | On or after the call date, redeemable preferred shares may be redeemed for cash at the option of the Company, in whole or in part, at a redemption price equal to the liquidation price per share, plus accrued and unpaid distributions, if any.
(2) | Dividends on Preferred Shares are payable quarterly.
ERPOP [Member] |
Class Of Stock [Line Items] |
Changes in Issued and Outstanding Common Shares and Units | The following tables present the changes in the Operating Partnership’s issued and outstanding Units and in the limited partners’ Units for the nine months ended September 30, 2018:
|  | 2018 |
General and Limited Partner Units |  |  |  |
General and Limited Partner Units outstanding at January 1, |  |  | 381,786,520 |
Issued to General Partner: |  |  |  |
Exercise of EQR share options |  |  | 194,796 |
EQR’s Employee Share Purchase Plan (ESPP) |  |  | 61,321 |
EQR’s restricted share grants, net |  |  | 122,877 |
Issued to Limited Partners: |  |  |  |
Restricted unit grants, net |  |  | 267,074 |
General and Limited Partner Units outstanding at September 30, |  |  | 382,432,588 |
Limited Partner Units |  |  |  |
Limited Partner Units outstanding at January 1, |  |  | 13,768,438 |
Limited Partner restricted unit grants, net |  |  | 267,074 |
Conversion of Limited Partner OP Units to EQR Common Shares |  |  | (12,510 | )
Limited Partner Units outstanding at September 30, |  |  | 14,023,002 |
Limited Partner Units Ownership Interest in Operating Partnership |  |  | 3.7 | %
Changes in Redemption Value of Redeemable Noncontrolling Interests and Limited Partners Interest | The following table presents the changes in the redemption value of the Redeemable Limited Partners for the nine months ended September 30, 2018 (amounts in thousands):
|  | 2018 |
Balance at January 1, |  | $ | 366,955 |
Change in market value |  |  | 14,361 |
Change in carrying value |  |  | (77 | )
Balance at September 30, |  | $ | 381,239 |
Issued and Outstanding Preferred Shares and Preference Units | The following table presents the Operating Partnership’s issued and outstanding “Preference Units” as of September 30, 2018 and December 31, 2017:
|  |  |  |  |  |  |  | Amounts in thousands |
|  |  |  | Annual |  |  |  |  |  |  |  |  |
|  | Call |  | Dividend Per |  |  | September 30, |  |  | December 31, |
|  | Date (1) |  | Unit (2) |  |  | 2018 |  |  | 2017 |
Preference Units: |  |  |  |  |  |  |  |  |  |  |  |  |  |
8.29% Series K Cumulative Redeemable Preference Units; liquidation value $50 per unit; 745,600 units issued and outstanding as of September 30, 2018 and December 31, 2017 |  | 12/10/26 |  | $ | 4.145 |  |  | $ | 37,280 |  |  | $ | 37,280 |
|  |  |  |  |  |  |  | $ | 37,280 |  |  | $ | 37,280 |
(1) | On or after the call date, redeemable preference units may be redeemed for cash at the option of the Operating Partnership, in whole or in part, at a redemption price equal to the liquidation price per unit, plus accrued and unpaid distributions, if any, in conjunction with the concurrent redemption of the corresponding Company Preferred Shares.
(2) | Dividends on Preference Units are payable quarterly.

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