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Discontinued Operations, Disposal of Chucapaca and Assets Held for Sale - Additional Information (Detail) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 19, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Discontinued Operations, Disposed of by Sale | Compania De Minas Buenaventura S.A.A. | Chucapaca | Canteras Del Hallazgo |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Percentage of stake sold | 51.00% | 51.00% |
Sibanye Spin-off | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Sibanye Gold |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Total distribution amount |  |  | $ 1,033.7

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