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Acquisitions and Divestitures - Summary of Preliminary Allocation of Purchase Price (Parenthetical) (Detail) - Integra gold corporation [member] | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 $ / shares | Jul. 10, 2017
Disclosure of detailed information about business combination [line items] |  |
Number of common shares issued | 77,180,898 | 77,180,898
Share price | $ 3.14 |

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- Definition The number of instruments or interests issued or issuable at acquisition date for equity interests of the acquirer transferred as consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B64 -Subparagraph f -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_f_iv&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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