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Share-Based Payments - Share-Based Payments - Disclosure of Details of Breakdown of the Closing Balance BSA 2010 (Detail) - BSA2010 [Member]	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding	500	610	1,044	8,334
Exercisable	500	610	1,044

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The number of share options outstanding in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2017-01-01
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-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2017-01-01
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-URIDate 2017-03-09

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The number of share options exercisable in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 2
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-URIDate 2017-03-09

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