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Reclamation Obligation - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Schedule Of Detailed Information About Reclamation Obligation [Line Items] |  |
Undiscounted value of the provision | $ 38.1 | $ 31.8
Western Mesquite Mines Inc [Member] |  |
Schedule Of Detailed Information About Reclamation Obligation [Line Items] |  |
Security for reclamation | $ 0.3 |
Bottom of range [member] |  |
Schedule Of Detailed Information About Reclamation Obligation [Line Items] |  |
Future cash flows using inflation rates | 2.20% |
Future cash flow discount rate | 1.80% |
Top of range [member] |  |
Schedule Of Detailed Information About Reclamation Obligation [Line Items] |  |
Future cash flows using inflation rates | 3.30% |
Future cash flow discount rate | 5.80% |

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