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Financial instruments and risk management - Additional information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Financial Instruments [Abstract] |  |
Description of exposure to risk | The key financial risks are capital and liquidity, commodity price, credit, foreign exchange and interest rate |
Transfers between Level 1 and Level 2 | $ 0 | $ 0
Transfers between Level 2 and Level 3 | $ 0 | $ 0

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- Definition The description of exposures to risks arising from financial instruments. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph 33 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_33_a&doctype=Standard -URIDate 2016-03-31 + Details
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- References No definition available. + Details
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- Definition The amount of transfers of assets into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2016-01-13 -Paragraph 93 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2016-03-30&anchor=para_93_e_iv&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of assets held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2016-01-13 -Paragraph 93 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2016-03-30&anchor=para_93_c&doctype=Standard -URIDate 2016-03-31 + Details
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