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Real Estate (Tables) | 6 Months Ended
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Jun. 30, 2014
Real Estate [Abstract] |
Schedule of Real Estate Investments And Accumlated Depreciation [Table Text Block} | The following table summarizes the carrying amounts for the Company’s investment in real estate (at cost) as of June 30, 2014 and December 31, 2013 (amounts in thousands):
|  | June 30, 2014 |  | December 31, 2013
Land |  | $ | 6,296,735 |  |  | $ | 6,192,512 |
Depreciable property: |  |  |  |
Buildings and improvements |  | 17,920,222 |  |  | 17,509,609 |
Furniture, fixtures and equipment |  | 1,302,882 |  |  | 1,214,220 |
In-Place lease intangibles |  | 507,633 |  |  | 502,218 |
Projects under development: |  |  |  |
Land |  | 391,156 |  |  | 353,574 |
Construction-in-progress |  | 615,836 |  |  | 635,293 |
Land held for development: |  |  |  |
Land |  | 256,536 |  |  | 341,389 |
Construction-in-progress |  | 50,089 |  |  | 52,133 |
Investment in real estate |  | 27,341,089 |  |  | 26,800,948 |
Accumulated depreciation |  | (5,170,438 | ) |  | (4,807,709 | )
Investment in real estate, net |  | $ | 22,170,651 |  |  | $ | 21,993,239 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | The following table summarizes the carrying amounts for the Company's above and below market ground and retail lease intangibles as of June 30, 2014 and December 31, 2013 (amounts in thousands):
Description |  | Balance Sheet Location |  | June 30, 2014 |  | December 31, 2013
Assets |  |  |  |  |  |
Ground lease intangibles – below market |  | Other Assets |  | $ | 178,251 |  |  | $ | 178,251 |
Retail lease intangibles – above market |  | Other Assets |  | 1,260 |  |  | 1,260 |
Lease intangible assets |  |  |  | 179,511 |  |  | 179,511 |
Accumulated amortization |  |  |  | (6,641 | ) |  | (4,364 | )
Lease intangible assets, net |  |  |  | $ | 172,870 |  |  | $ | 175,147 |
Liabilities |  |  |  |  |  |
Ground lease intangibles – above market |  | Other Liabilities |  | $ | 2,400 |  |  | $ | 2,400 |
Retail lease intangibles – below market |  | Other Liabilities |  | 5,270 |  |  | 5,500 |
Lease intangible liabilities |  |  |  | 7,670 |  |  | 7,900 |
Accumulated amortization |  |  |  | (1,678 | ) |  | (1,161 | )
Lease intangible liabilities, net |  |  |  | $ | 5,992 |  |  | $ | 6,739 |
Schedule of Expected Amortization Expense [Table Text Block] | The following table provides a summary of the aggregate amortization expense for above and below market ground lease intangibles and retail lease intangibles for each of the next five years (amounts in thousands):
|  | Remaining |  |  |  |  |  |  |  |  |  |
|  | 2014 |  | 2015 |  | 2016 |  | 2017 |  | 2018 |  | 2019
Ground lease intangibles |  | $ | 2,161 |  |  | $ | 4,321 |  |  | $ | 4,321 |  |  | $ | 4,321 |  |  | $ | 4,321 |  |  | $ | 4,321 |
Retail lease intangibles |  | (469 | ) |  | (939 | ) |  | (896 | ) |  | (540 | ) |  | (71 | ) |  | (71 | )
Total |  | $ | 1,692 |  |  | $ | 3,382 |  |  | $ | 3,425 |  |  | $ | 3,781 |  |  | $ | 4,250 |  |  | $ | 4,250 |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] | The following table summarizes the acquisition date fair values of the assets acquired and liabilities assumed, which the Company determined using Level 1, Level 2 and Level 3 inputs (amounts in thousands):
Land |  | $ | 2,239,000 |
Depreciable property: |  |
Buildings and improvements |  | 5,765,538 |
Furniture, fixtures and equipment |  | 61,470 |
In-Place lease intangibles |  | 304,830 |
Projects under development |  | 36,583 |
Land held for development |  | 244,097 |
Investments in unconsolidated entities |  | 230,608 |
Other assets |  | 195,260 |
Other liabilities |  | (108,997 | )
Net assets acquired |  | $ | 8,968,389 |
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Text Block] | The following table summarizes the acquisition date fair values of the above and below market ground and retail lease intangibles, which we determined using Level 2 and Level 3 inputs (amounts in thousands):
Description |  | Balance Sheet Location |  | Fair Value
Ground lease intangibles – below market |  | Other Assets |  | $ | 178,251 |
Retail lease intangibles – above market |  | Other Assets |  | 1,260 |
Ground lease intangibles – above market |  | Other Liabilities |  | 2,400 |
Retail lease intangibles – below market |  | Other Liabilities |  | 8,040 |
Acquired Properties Table Text Block | During the six months ended June 30, 2014, the Company disposed of the following to unaffiliated parties (sales price in thousands):
|  | Properties |  | Apartment Units |  | Sales Price
Rental Properties |  | 1 |  |  | 336 |  |  | $ | 40,850 |
Land Parcel |  | — |  |  | — |  |  | 8,200 |
Total |  | 1 |  |  | 336 |  |  | $ | 49,050 |
During the six months ended June 30, 2014, the Company acquired the entire equity interest in the following from unaffiliated parties (purchase price in thousands):
|  | Properties |  | Apartment Units |  | Purchase Price
Rental Properties – Consolidated |  | 3 |  |  | 772 |  |  | $ | 249,610 |
Land Parcels – Consolidated |  | — |  |  | — |  |  | 15,790 |
Total |  | 3 |  |  | 772 |  |  | $ | 265,400 |
Statement [Line Items] |
Business Acquisition, Pro Forma Information [Table Text Block] | The following table illustrates the effect on net income, earnings per share – basic and earnings per share – diluted as if the Company had consummated the Archstone Acquisition as of January 1, 2012 (amounts in thousands, except per share amounts):
|  | Six Months Ended |  | Quarter Ended
|  | June 30, 2013 |  | June 30, 2013
Total revenues |  | $ | 1,256,088 |  |  | $ | 635,078 |
Income from continuing operations |  | 60,541 |  |  | 96,585 |
Discontinued operations, net |  | 1,608,374 |  |  | 389,329 |
Net income |  | 1,668,915 |  |  | 485,914 |
Net income available to Common Shares |  | 1,601,368 |  |  | 467,237 |
Earnings per share - basic: |  |  |  |
Net income available to Common Shares |  | $ | 4.45 |  |  | $ | 1.30 |
Weighted average Common Shares outstanding (1) |  | 359,509 |  |  | 359,653 |
Earnings per share - diluted: |  |  |  |
Net income available to Common Shares |  | $ | 4.44 |  |  | $ | 1.29 |
Weighted average Common Shares outstanding (1) |  | 375,722 |  |  | 375,910 |
(1) | Includes an adjustment for Common Shares issued to the public in November/December 2012 and to an affiliate of Lehman Brothers Holdings Inc. in February 2013 as partial consideration for the Archstone Acquisition.
Limited Partner [Member] |
Statement [Line Items] |
Business Acquisition, Pro Forma Information [Table Text Block] | The following table illustrates the effect on net income, earnings per Unit – basic and earnings per Unit – diluted as if the Operating Partnership had consummated the Archstone Acquisition as of January 1, 2012 (amounts in thousands, except per Unit amounts):
|  | Six Months Ended |  | Quarter Ended
|  | June 30, 2013 |  | June 30, 2013
Total revenues |  | $ | 1,256,088 |  |  | $ | 635,078 |
Income from continuing operations |  | 60,541 |  |  | 96,585 |
Discontinued operations, net |  | 1,608,374 |  |  | 389,329 |
Net income |  | 1,668,915 |  |  | 485,914 |
Net income available to Units |  | 1,668,439 |  |  | 485,693 |
Earnings per Unit - basic: |  |  |  |
Net income available to Units |  | $ | 4.45 |  |  | $ | 1.30 |
Weighted average Units outstanding (1) |  | 373,245 |  |  | 373,403 |
Earnings per Unit - diluted: |  |  |  |
Net income available to Units |  | $ | 4.44 |  |  | $ | 1.29 |
Weighted average Units outstanding (1) |  | 375,722 |  |  | 375,910 |
(1) | Includes an adjustment for Common Shares issued to the public in November/December 2012 and to an affiliate of Lehman Brothers Holdings Inc. in February 2013 as partial consideration for the Archstone Acquisition. Concurrent with these transactions, ERPOP issued the same number of OP Units to EQR.

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- Definition Tabular disclosure of the cost of land, buildings and improvements, furniture and fixtures and accumulated depreciation in aggregate for all consolidated properties owned at the balance sheet date. + References No definition available. + Details
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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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