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Impairment of Investments (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Impairment Of Assets [Line Items] |  |  |  |
Total impairment of investments |  | $ 37.9 | $ 6.8 | $ 10.3
Arctic Platinum [Member] |  |  |  |
Impairment Of Assets [Line Items] |  |  |  |
Total impairment of investments | [1] | 30.0 |  |
Listed investments |  |  |  |
Impairment Of Assets [Line Items] |  |  |  |
Total impairment of investments |  | $ 7.9 | 0.9 | $ 10.3
Unlisted investments |  |  |  |
Impairment Of Assets [Line Items] |  |  |  |
Total impairment of investments |  |  | $ 5.9 |
[1] | Following the Group's decision during 2013 to dispose of non-core projects, Arctic Platinum was classified as held for sale and, accordingly, valued at the lower of fair value less cost of disposal or carrying value. During 2015, active marketing activities for the disposal of the project continued. During 2015, Arctic Platinum was impaired by $30.0 million to its fair value less cost of disposal, resulting in a carrying value of US$1.0 million at December 31, 2015.

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- Definition The amount of other than temporary impairment losses on equity securities categorized as Available-for-sale and Held-for-sale assets which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities and Held-for-sale assets. + References No definition available. + Details
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- Definition Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2443-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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