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Dividends Declared and Paid - Summary of Dividends Declared and Paid (Parenthetical) (Detail) - $ / shares |  |  | 12 Months Ended
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Jul. 13, 2017 | Jun. 29, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of dividends declared and paid on ordinary capital [Abstract] |  |  |  |  |
Dividends paid per ordinary share | $ 0.90 | $ 0.85 | $ 0.90 | $ 0.85 | $ 1.10

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- Definition Disclosure of dividends declared and paid on ordinary capital abstract. + References No definition available. + Details
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- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2016-01-13 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=34&date=2016-03-30&anchor=para_16A_f&doctype=Standard -URIDate 2016-03-31 + Details
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