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Mineral Properties, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 01, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Capitalized interest |  | $ 264,049 |  | $ 214,559 | $ 43,461
Transferred From Construction In Process To Inventory | $ 9,900 |  |  |  |
Construction in progress [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Transferred From Construction In Progress |  | 195,300 |  |  |
Mineral Properties [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Transferred To Mineral Properties | 53,500 |  |  |  |
Property, plant and equipment [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Transferred From Construction In Progress to Property Plant Equipment | $ 131,900 |  |  |  |
Aurizona [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Capitalized Costs Of Construction In Progress Gross |  | 41,700 |  | 121,700 |
Capitalized interest |  | 5,100 |  | $ 6,500 |
Value added tax paid |  |  | $ 11,300 |  |
Aurizona [Member] | Construction in progress [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
PreProduction Income Earned |  | 5,600 |  |  |
Castle Mountain [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Capitalized Costs Of Construction In Progress Gross |  | $ 21,000 |  |  |

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