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Financial Risk Management Objectives - Commodity Price Sensitivity (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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23% increase in commodity price [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Percentage of change of commodity price | 23.00% |
Effect on profit before tax due to change in commodity price | $ 6,461 |
23% decrease in commodity price [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Percentage of change of commodity price | (23.00%) |
Effect on profit before tax due to change in commodity price | $ (6,461) |
44% increase in commodity price [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Percentage of change of commodity price |  | 44.00%
Effect on profit before tax due to change in commodity price |  | $ 11,282
44% decrease in commodity price [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Percentage of change of commodity price |  | (44.00%)
Effect on profit before tax due to change in commodity price |  | $ (11,282)

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- Definition Risk exposure associated with instruments sharing characteristic, percentage change in risk. + References No definition available. + Details
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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 2018-01-01 -Paragraph B8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_B8_c&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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