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Goodwill - Summary of Key Assumptions Used for Assessing the Recoverable Amount of Goodwil (Detail) - Goodwill [member]	12 Months Ended
	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

Conversion Factor Of Resources And Exploration

+ References

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- Definition

Fair Value Per Ounce Of Resources And Exploration

+ References

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- Definition

Gold price per ounce.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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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

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