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Share-based payments - Summary of Status and Movements in RSUs and PSUs (Detail) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Restricted Shares Without Performance Criteria [member] |  |
Disclosure Of Other Equity Instruments [Line Items] |  |
At January 1, (in shares) | 341,198 | 248,013
Granted (in shares) | 214,859 | 187,366
Redeemed (in shares) | (181,491) | (69,968)
Forfeited (in shares) | (41,447) | (24,213)
At December 31, (in shares) | 333,119 | 341,198
Restricted Shares With Performance Criteria [member] |  |
Disclosure Of Other Equity Instruments [Line Items] |  |
At January 1, (in shares) | 0 |
Granted (in shares) | 167,976 | 0
Forfeited (in shares) | (15,049) |
At December 31, (in shares) | 152,927 | 0
Performance share unit [member] |  |
Disclosure Of Other Equity Instruments [Line Items] |  |
At January 1, (in shares) | 381,293 | 286,188
Granted (in shares) | 261,522 | 113,938
Expired (in shares) | (118,605) | 0
Forfeited (in shares) | (39,311) | (18,833)
At December 31, (in shares) | 484,899 | 381,293

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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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