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Financial Risk Management Objectives - Commodity Price Sensitivity (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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16% increase in commodity price [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Percentage of change of commodity price | 28.00% | (16.00%)
Effect on profit before tax due to change in commodity price | $ 5,398 | $ (3,473)
16% decrease in commodity price [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Percentage of change of commodity price | (28.00%) | 16.00%
Effect on profit before tax due to change in commodity price | $ (5,398) | $ 3,473

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph B8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_B8_c&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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- Details
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- Details
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