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Acquisition of Integra - Additional Information (Detail) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 10, 2017 USD ($) | Jul. 07, 2017 $ / shares | Jul. 07, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jul. 10, 2017 | Jul. 10, 2017 shares
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Taxes as a reversal of the unrealized gain |  |  |  | $ 0 | $ 2,595,000 |  |
Integra gold corporation [member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  |  |  | 15,436,179 | 15,436,179
Fair value of shares issued | $ 188,061,000 |  |  |  |  |  |
Cash paid | 99,823,000 |  |  |  |  |  |
Advances as part of consideration | 27,046,000 |  |  |  |  |  |
Fair value of the existing available-for-sale investment | 41,968,000 |  |  |  |  |  |
Gain on marketable securities | 28,363,000 |  |  |  |  |  |
Taxes as a reversal of the unrealized gain | 4,023,000 |  |  |  |  |  |
Share price (CAD per share) | $ / shares |  | $ 15.70 |  |  |  |  |
Average foreign exchange rate |  |  | $ 0.776 |  |  |  |
Goodwill | 92,591,000 |  |  |  |  |  |
Goodwill deductible for tax purposes | $ 0 |  |  |  |  |  |

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