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Exchange Rates - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Sterling [member] |  |  |
Disclosure Of Exchange Rates [line items] |  |  |
Average rates of exchange for the year | 0.75 | 0.78 | 0.74
Rates of exchange on the last day of the year | 0.78 | 0.74 | 0.81
Euro [member] |  |  |
Disclosure Of Exchange Rates [line items] |  |  |
Average rates of exchange for the year | 0.85 | 0.89 | 0.90
Rates of exchange on the last day of the year | 0.87 | 0.83 | 0.95

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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Disclosure of exchange rates. + References No definition available. + Details
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- Details
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- Details
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