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Related Parties - Summarized Changes of Number of Restricted and Performance Shares Granted (Detail) shares in Thousands | 12 Months Ended
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Dec. 31, 2018 shares
Summary of related parties [line items] |
Balance on December 31, 2017 | 166,270,000
Shares granted | 369,976
Forfeiture of granted shares due to termination of executive employment | (19,886)
Balance on December 31, 2018 | 369,976,000
April 9, 2018 [member] |
Summary of related parties [line items] |
Shares granted | 103,592,000
September 19, 2018 [member] |
Summary of related parties [line items] |
Shares granted | 80,000,000
September 24, 2018 [member] |
Summary of related parties [line items] |
Shares granted | 40,000,000

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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of instruments other equity instruments cancellation of granted shares due to termination of executive employment. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Summary of related parties. + References No definition available. + Details
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- Details
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- Details
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- Details
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