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Share Capital - Summary of Share Capital (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Jul. 10, 2017 USD ($)
Disclosure of classes of share capital [line items] |  |  |
Balance beginning of year | $ 3,571,464 |  |
Balance end of year | $ 3,723,482 | $ 3,571,464 |
Integra gold corporation [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Shares issued for acquisition of Integra | 77,180,898 |  | 77,180,898
Shares issued for acquisition of Integra | $ 188,061 |  | $ 188,061
Voting common shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Beginning balance | shares | 716,587,134 | 716,587,134 |
Shares issued upon exercise of share options, for cash | shares | 242,648 |  |
Ending balance | shares | 794,010,680 | 716,587,134 |
Voting common shares [member] | Integra gold corporation [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Shares issued for acquisition of Integra | 77,180,898 |  |
Share capital [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Shares issued upon exercise of share options, for cash | $ 586 |  |
Estimated fair value of share options exercised | 176 |  |
Balance beginning of year | 2,819,101 | $ 5,319,101 |
Capital reduction |  | (2,500,000) |
Balance end of year | 3,007,924 | $ 2,819,101 |
Share capital [member] | Integra gold corporation [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Shares issued for acquisition of Integra | $ 188,061 |  |

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