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Share-based payments - Summary of Information about Awards Granted (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Annual Performance Plan [member] |  |  |
Information regarding option pricing models and assumptions used for grants during the year [line items] |  |  |
Description of option pricing model | Binomial valuation model | Binomial valuation model | Binomial valuation model
Long Term Incentive Plan [member] |  |  |
Information regarding option pricing models and assumptions used for grants during the year [line items] |  |  |
Description of option pricing model | Monte Carlo Simulation and Binomial valuation model | Monte Carlo Simulation and Binomial valuation model | Monte Carlo Simulation and Binomial valuation model

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- Definition The description of the option pricing model used for share options granted. [Refer: Option pricing model [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition fair value of share award using monte carlo pricing model and weighted average assumptions. + References No definition available. + Details
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- Details
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- Details
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