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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) - 3 months ended Mar. 31, 2017 - USD ($) $ in Thousands | Total | PREFERRED SHARES | COMMON SHARES, $0.01 PAR VALUE | PAID IN CAPITAL | RETAINED EARNINGS | ACCUMULATED OTHER COMPREHENSIVE (LOSS) | OPERATING PARTNERSHIP | PARTIALLY OWNED PROPERTIES
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of year at Dec. 31, 2016 | $ 10,229,078 | $ 37,280 | $ 3,659 | $ 8,758,422 | $ 1,543,626 | $ (113,909) |  |
Balance, beginning of year at Dec. 31, 2016 | 231,906 |  |  |  |  |  | $ 221,297 | $ 10,609
COMMON SHARES, $0.01 PAR VALUE |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 10 | 14,233 |  |  | (14,243) |
Exercise of share options |  |  | 1 | 3,141 |  |  |  |
Restricted shares |  |  | 1 | 2,695 |  |  |  |
Share options |  |  |  | 4,184 |  |  |  |
ESPP discount |  |  |  | 307 |  |  |  |
PAID IN CAPITAL |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 10 | 14,233 |  |  | (14,243) |
Exercise of share options |  |  | 1 | 3,141 |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  |  | 1,574 |  |  |  |
Share-based employee compensation expense |  |  |  |  |  |  |  |
Offering costs |  |  |  | (21) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | 132 |  |  |  |
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership | (50,766) |  |  | 50,766 |  |  |  |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 11,564 |  |  | (11,564) |
RETAINED EARNINGS |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 143,742 |  |  |  | 143,742 |  |  |
Common Share distributions |  |  |  |  | (184,941) |  |  |
Preferred Share distributions |  |  |  |  | (773) |  |  |
Accumulated other comprehensive income (loss) – derivative instruments: |  |  |  |  |  |  |  |
Losses reclassified into earnings from other comprehensive income | (4,583) |  |  |  |  | 4,583 |  |
OPERATING PARTNERSHIP |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 10 | 14,233 |  |  | (14,243) |
Equity compensation associated with Noncontrolling Interests |  |  |  |  |  |  | 2,964 |
Net income | 149,941 |  |  |  |  |  |  |
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (6,696) | (5,134)
Change in carrying value of Redeemable Noncontrolling Interests – Operating Partnership | (31,593) |  |  |  |  |  | 31,593 |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 11,564 |  |  | (11,564) |
Net income attributable to Noncontrolling Interests | 5,411 |  |  |  |  |  | 5,411 | 788
PARTIALLY OWNED PROPERTIES |  |  |  |  |  |  |  |
Net income | 149,941 |  |  |  |  |  |  |
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (6,696) | (5,134)
Net income attributable to Noncontrolling Interests | 5,411 |  |  |  |  |  | 5,411 | 788
Contributions – Noncontrolling Interests – Partially Owned Properties | 125 |  |  |  |  |  |  | 125
Balance, end of period at Mar. 31, 2017 | 10,280,276 | $ 37,280 | $ 3,671 | $ 8,846,997 | $ 1,501,654 | $ (109,326) |  |
Balance, end of period at Mar. 31, 2017 | $ 235,150 |  |  |  |  |  | $ 228,762 | $ 6,388

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Name: | us-gaap_StatementEquityComponentsAxis=eqr_PartiallyOwnedMember
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Data Type: | na
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