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Financial Risk Management Objectives - Commodity Price Sensitivity (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
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

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- Details

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