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Shareholders' equity - Outstanding (Detail) | Dec. 31, 2018 EquityInstruments | Dec. 31, 2018 USD ($) | Dec. 31, 2018 shares | Dec. 31, 2017 EquityInstruments | Dec. 31, 2017 USD ($) | Dec. 31, 2017 shares | Dec. 31, 2016 EquityInstruments
--- | --- | --- | --- | --- | --- | --- | ---
Shareholders' equity |  |  |  |  |  |  |
Common share outstanding |  |  | 186,692,481 |  |  | 185,930,331 |
Stock options | 1,015,409 | 1,015,409 |  | 955,603 | 955,603 |  | 1,304,328
Restricted Share Units | $ |  | 115,337 |  |  | 119,796 |  |
Total |  |  | 187,823,227 |  |  | 187,005,730 |

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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 -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_d&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_i&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_vi&doctype=Standard -URIDate 2018-03-16 + Details
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