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Goodwill - Summary of Key Assumptions Used for Assessing the Recoverable Amount of Goodwil (Detail) - Goodwill [member] | 12 Months Ended
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Dec. 31, 2018 $ / oz
Disclosure of reconciliation of changes in goodwill [line items] |
Discount rate | 5.00%
Conversion factor of resources and exploration potential to proven and probable reserves | 21.00%
Fair value per ounce of resources and exploration potential beyond proven and probable reserves | 140
Bottom of range [member] |
Disclosure of reconciliation of changes in goodwill [line items] |
Gold price ($/oz) | 1,275
Top of range [member] |
Disclosure of reconciliation of changes in goodwill [line items] |
Gold price ($/oz) | 1,300

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- Definition Fair Value Per Ounce Of Resources And Exploration + References No definition available. + Details
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- Definition The discount rate used in the current measurement of fair value less costs of disposal. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 130 -Subparagraph f -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_f_iii&doctype=Standard -URIDate 2018-03-16 + Details
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