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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, 2017 $ / oz
Disclosure Of Cash Flow Statement [Line Items] |
Gold price | 1,300
Discount rate | 7.00%
Bottom of range [member] |
Disclosure Of Cash Flow Statement [Line Items] |
Silver price | 16
Top of range [member] |
Disclosure Of Cash Flow Statement [Line Items] |
Silver price | 18

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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 2017-01-01 -Paragraph 130 -Subparagraph f -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_f_iii&doctype=Standard -URIDate 2017-03-09 + Details
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