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Financial Risk Management Objectives - Commodity Price Sensitivity (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
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)
25% increase in commodity price [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Percentage of change of commodity price		25.00%
Effect on profit before tax due to change in commodity price		$ 6,302
25% decrease in commodity price [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Percentage of change of commodity price		(25.00%)
Effect on profit before tax due to change in commodity price		$ (6,302)

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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.

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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 2017-01-01
-Paragraph B8
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_B8_c&doctype=Appendix&seq=2
-URIDate 2017-03-09

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