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Deferred Consideration - Additional Information (Detail) - 12 months ended Dec. 31, 2017 oz in Millions, CAD in Millions, $ in Millions | CAD oz | USD ($) oz
--- | --- | ---
Disclosure of deferred income [line items] |  |
Spot price | 5.00% | 5.00%
Percentage of payable silver delivered | 22.50% | 22.50%
Decrease in percentage of payable silver once threshold reached | 15.00% | 15.00%
Quantity of silver delivered | 86 | 86
Long-term streaming agreement [member] |  |
Disclosure of deferred income [line items] |  |
Upfront payment on silver stream transaction | CAD 789 | $ 610

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- Definition Quantity of silver delivered. + References No definition available. + Details
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- Details
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