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Financial Risk Management Objectives - Commodity Price Sensitivity (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
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	16.00%
Effect on profit before tax due to change in commodity price	$ (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	(16.00%)
Effect on profit before tax due to change in commodity price	$ 3,473
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)

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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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X

- 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 2019-01-01
-Paragraph B8
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_B8_c&doctype=Appendix&subtype=B
-URIDate 2019-03-27

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- Details

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