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Goodwill - Additional Information (Detail) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) $ / oz | Dec. 31, 2017 USD ($) | Jul. 10, 2017 USD ($)
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill | $ 92,591 | $ 92,591 |
Change in gold price ($/oz) | $ / oz | 1,200 |  |
Integra gold corporation [member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill recognized |  |  | $ 92,591
Goodwill | $ 115,600 |  | $ 92,591

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