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Carrying Value of Equity Investment (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying amount of investment | $ 237.5 | $ 254.4 |
Far Southeast (FSE) Deposit |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying amount of investment | 230.0 | 230.0 |
Rusoro Mining Limited |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying amount of investment |  |  | 13.2
Rand Refinery Limited |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying amount of investment |  | 23.7 | 12.9
Bezant Resources Plc |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying amount of investment | 7.5 |  |
Timpetra Resource Limited |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying amount of investment |  | $ 0.7 |

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 + Details
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Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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