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Property, Plant and Equipment - Summary of Key Assumptions Used for Assessing Recoverable Amount of Company's CGUs Versus Carrying Values (Detail) - Individual assets or cash-generating units [member] | 12 Months Ended
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Dec. 31, 2017 $ / oz $ / lb
Disclosure of detailed information about property, plant and equipment [line items] |
Gold price | $ / oz | 1,300
Silver price | $ / oz | 18
Lead price | 1.09
Zinc price | 1.27
Copper price | 2.80
Bottom of range [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Discount rate | 5.00%
Top of range [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Discount rate | 8.00%

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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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