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Financial Risks - Summary of Exchange Rates of US Dollar and UK Pound per Euro (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
USD [member] |  |  |  |  |
Disclosure of foreign exchange rates [line items] |  |  |  |  |
Closing rates | 1.12 | 1.14 | 1.20 | 1.05 | 1.09
GBP [member] |  |  |  |  |
Disclosure of foreign exchange rates [line items] |  |  |  |  |
Closing rates | 0.85 | 0.90 | 0.89 | 0.85 | 0.74

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- Definition Disclosure of foreign exchange rates. + References No definition available. + Details
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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 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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- Details
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