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Income Taxes - Disclosure Of Detailed Information About Deductible Temporary Differences Unused Tax Losses And Unused Tax Credits For Which Deferred Tax Assets Not Recognized (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Unrecognized deferred tax assets [Abstract] |  |
Non-capital losses | $ 41,647 | $ 58,304
State non-capital losses | 41,025 | 42,325
Mineral properties, plant and equipment | 18,735 | 31,141
Share issue costs | 4,522 | 4,976
Inventory | 27,422 | 13,079
Unrealized foreign exchange losses on investment and advances | 38,948 | 53,850
Reclamation obligation | 28,609 | 14,018
State alternative minimum tax credit | 6,525 | 6,525
Capital losses | 36,570 | 21,501
Interest expense | 16,557 | 18,024
Other | 2,100 | 5,456
Total unrecognized deferred tax assets | $ 262,660 | $ 269,199

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