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Financial risk management - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 10, 2012
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 | $ 675,000 | $ 25,000 |
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 |  |
Maximum exposure to credit risk | $ 356,823,000 |  |
Number of days from shipment | 15 days |  |
Debt to capital ratio | 15.20% | 13.80% |
Senior notes [member] |  |  |
Disclosure of risk management [line items] |  |  |
Debt fixed interest rate |  |  | 6.125%
Revolving credit facility [member] |  |  |
Disclosure of risk management [line items] |  |  |
Net Debt to EBITDA ratio | 2.26 | 0.9 |

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