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Equity-Accounted Investees - Additional Information (Detail) - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 06, 2017 | Aug. 22, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 19, 2018 | Dec. 31, 2010
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |
Carrying value write down due to loss incurred by the entity |  |  | $ 225,100,000 | $ 171,300,000 |  |
Rusoro Mining Limited [member] |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |
Carrying value write down due to loss incurred by the entity |  |  |  |  |  | $ 0
Fair value of investment based on quoted market price |  |  | 13,400,000 | 7,700,000 |  |
Unrecognised share of profits |  |  | 2,600,000 | 2,000,000 |  |
Cumulative unrecognised share of losses |  |  | $ 198,600,000 | $ 196,000,000 |  |
Pre and post award |  | $ 967,800,000 |  |  |  |
Excess of pre and post award |  | $ 1,200,000,000 |  |  |  |
Arbitration settlement | $ 1,300,000,000 |  |  |  |  |
Accrued interest percentage |  |  | 9.00% |  |  |
Total settlement agreement amount |  |  |  |  | $ 1,280,000,000 |

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- Definition Line items represent concepts included in Equity-Accounted Investees table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Excess of pre and post award. + References No definition available. + Details
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- Definition Pre and post award interest. + References No definition available. + Details
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- Definition The cumulative amount of the unrecognised share of losses of associates if the entity has stopped recognising its share of losses when applying the equity method. [Refer: Associates [member]; Unrecognised share of losses of associates] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 22 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_22_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The fair value of investments in associates if there are quoted market prices for the investment. [Refer: Associates [member]; Investments in associates] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 21 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_21_b_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_24_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B16&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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