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Goodwill - Additional Information (Detail) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) $ / oz | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill | $ 92,591 | $ 92,591 |
Integra Gold Corporation |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill |  |  | $ 92,591
Amount by which unit's recoverable amount exceeds its carrying amount | $ 25,000 |  |
Decrease in gold price per ounce leading to impairment | $ / oz | 100 |  |
Increase in operating costs leading to impairment | 10.00% |  |
Increase in capital costs leading to impairment | 10.00% |  |

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