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Defined Benefit Plans - Summary of Defined Benefit Plans' Weighted Average Asset Allocation Percentages by Asset Category (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Pension Plans [member] |  |
Investment funds |  |
Money market | 0.00% | 2.00%
Canadian fixed income | 100.00% | 98.00%
Total | 100.00% | 100.00%
Supplemental pension plan [member] |  |
Investment funds |  |
Money market | 6.00% | 3.00%
Canadian fixed income | 2.00% | 4.00%
Other | 46.00% | 44.00%
Total | 100.00% | 100.00%
Supplemental pension plan [member] | Canada [member] |  |
Investment funds |  |
Equities | 20.00% | 21.00%
Supplemental pension plan [member] | UNITED STATES |  |
Investment funds |  |
Equities | 19.00% | 20.00%
Supplemental pension plan [member] | Other jurisdictions [member] |  |
Investment funds |  |
Equities | 7.00% | 8.00%

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- Definition Investment Securities [abstract] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of equity interest to be transferred. + References No definition available. + Details
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Namespace Prefix: | ego_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of fixed income securities. + References No definition available. + Details
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Data Type: | num:percentItemType
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Period Type: | duration

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- Definition Percentage of investments. + References No definition available. + Details
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- Definition Percentage of money market securities. + References No definition available. + Details
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- Definition Percentage of other securities. + References No definition available. + Details
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- Details
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- Details
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Balance Type: |
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- Details
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- Details
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- Details
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