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Equity-Accounted Investees - Additional Information (Detail) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 06, 2017 | Aug. 22, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2010
Disclosure of equity-accounted investees [Line Items] |  |  |  |  |  |  |
Carrying value write down due to loss incurred by the entity |  |  | $ 171,300,000 | $ 170,700,000 | [1] |  |
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 |  |  | 7,700,000 | 23,900,000 |  |  |
Unrecognised share of profits |  |  | 2,000,000 | 18,700,000 |  | $ 3,600,000 |
Cumulative share of profits |  |  | $ 196,000,000 | $ 194,000,000 |  |  |
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% |  |  |  |
[1] | As Restated - Refer note 40 for further details.

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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 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 2017-01-01 -Paragraph 22 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_22_c&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_24_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B16&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_e&doctype=Standard -URIDate 2017-03-09 + Details
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