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Taxation - Additional Information (Detail) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Disclosure of income taxes [abstract] |  |  |
Effective tax rate on profit before taxation | 26.90% | 16.70% | 22.10%
Increase in effective tax rate on profit before taxation | 10.20% |  |

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- Definition The tax expense (income) divided by the accounting profit. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Disclosure of income taxes. + References No definition available. + Details
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- Definition Increase (decrease) in average effective tax rate + References No definition available. + Details
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