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Fair value measurement- Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Transfers between Level 1 and Level 2 fair value measurements | $ 0 |
Transfers into Level 3 of fair value measurements | 0 |
Transfers out of Level 3 of fair value measurements | $ 0 |
Interest rate used to discount cash flows relating to finance lease obligations | 6.90% | 7.20%
Unquoted equity investments [Member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Average price earnings ratio for a competitor group | 30.7 | 24.5
Non-marketability factor | 30.00% | 30.00%
Sensitivity analysis increase in average price earnings ratio in fair value of investments | $ 2,000,000 | $ 2,000,000
Sensitivity analysis decrease in average price earnings ratio in fair value of investments | $ 2,000,000 | $ 2,000,000
Sensitivity analysis increase in price-earnings ratio | 10.00% | 10.00%
Sensitivity analysis decrease in price-earnings ratio | 10.00% | 10.00%
Sensitivity analysis increase in net assets fair value of investments | $ 7,000,000 | $ 7,000,000
Sensitivity analysis decrease in net assets fair value of investments | $ 7,000,000 | $ 7,000,000
Sensitivity analysis increase in net assets percentage | 10.00% | 10.00%
Sensitivity analysis decrease in net assets percentage | 10.00% | 10.00%

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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 2017-01-01 -Paragraph 93 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_e_iv&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 93 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of transfers of assets out of 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 2017-01-01 -Paragraph 93 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_e_iv&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Average price earnings ratio for a competitor group. + References No definition available. + Details
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