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Dividends - Additional Information (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Dividends Paid and Proposed [Line Items] |  |  |
Final Proposed (not recognised as a liability at 31 December) | $ 0.710 | $ 0.640 | $ 0.575
Proposed dividends [member] |  |  |
Disclosure of Dividends Paid and Proposed [Line Items] |  |  |
Final Proposed (not recognised as a liability at 31 December) | $ 0.71 |  |
Final Proposed (not recognised as a liability at 31 December) dividend approval date | May 04, 2018 |  |
Final proposed dividend record date | Apr. 03, 2018 |  |

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- Definition The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 137 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_137_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Disclosure of dividends paid and proposed. + References No definition available. + Details
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- Definition Final proposed dividend approval date. + References No definition available. + Details
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- Definition Final proposed dividend record date. + References No definition available. + Details
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- Details
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