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Financial Risks - Summary of Exchange Rates of US Dollar and UK Pound per Euro (Detail)	12 Months Ended
	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

X

- Definition

Disclosure of foreign exchange rates.

+ References

No definition available.

+ Details

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X

- 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

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- Details

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