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Financial Risk Management - Additional Information (Detail) $ / T in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / T T | Dec. 31, 2016
Disclosure of risk management [line items] |  |
Increase/decrease in the U.S. dollar exchange rate against all currencies except Canadian dollar, Australian dollar, Euro, Turkish lira, Chinese renminbi, Swedish krona, Romanian lei, Great British pound and Brazilian real | 1.00% |
Decrease/increase in profit (loss) before taxes due to 1% increase/decrease in the U.S. dollar exchange rate against all currencies except Canadian dollar, Australian dollar, Euro, Turkish lira, Chinese renminbi, Swedish krona, Romanian lei, Great British pound and Brazilian real | $ 25 |
Decrease/increase in other comprehensive income due to 1% increase/decrease in the U.S. dollar exchange rate against all currencies except Canadian dollar, Australian dollar, Euro, Turkish lira, Chinese renminbi, Swedish krona, Romanian lei, Great British pound and Brazilian real | $ 0 |
Debt fixed interest rate | 6.13% |
Payment for metal sales period description | Payment for metal sales is normally in advance or within fifteen days of shipment depending on the buyer. |
Number of days from shipment | 15 days |
Debt to capital ratio | 13.80% | 14.00%
Net Debt to EBITDA ratio | 0.9 | (1.7)
Level 2 [member] |  |
Disclosure of risk management [line items] |  |
Derivative liability | $ 837 |
Lead [member] |  |
Disclosure of risk management [line items] |  |
Fair value hedge minimum price | $ / T | 2,300 |
Hedge per tonne | T | 15,336 |
Zinc [member] |  |
Disclosure of risk management [line items] |  |
Fair value hedge minimum price | $ / T | 2,850 |
Hedge per tonne | T | 25,416 |
Top of range [member] |  |
Disclosure of risk management [line items] |  |
Target debt to capital ratio less than 30% | 30.00% |
Net Debt to EBITDA target ratio | 3.5 |

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