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Non-Current Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended |  |  |  | 6 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Rusoro Mining Limited | Dec. 31, 2012 Rusoro Mining Limited | Dec. 31, 2013 Far Southeast (FSE) Deposit | Dec. 31, 2012 Far Southeast (FSE) Deposit | Dec. 31, 2013 Far South East Project [Member] | Dec. 31, 2012 Far South East Project [Member] | Dec. 31, 2010 Far South East Project [Member] Lepanto Consolidated Mining Company | Dec. 31, 2010 Far South East Project [Member] Liberty Express Assets | Dec. 31, 2012 Far South East Project [Member] Liberty Express Assets | Dec. 31, 2011 Far South East Project [Member] Liberty Express Assets | Mar. 31, 2012 Far South East Project [Member] Liberty Express Assets | Dec. 31, 2013 Rand Refinery Limited | Dec. 31, 2012 Rand Refinery Limited
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain on disposal of listed investments before tax | $ 7.4 | $ 14.7 | $ 12.8 |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership % |  |  |  | 26.40% | 26.40% | 40.00% | 40.00% | 40.00% | 40.00% |  |  |  |  | 40.00% | 2.80% | 34.90%
Dividends received |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Pre-agreed acquisition price for a 60% interest in FSE, option fees paid |  |  |  |  |  |  |  |  |  | 10.0 |  |  |  |  |  |
Pre-agreed acquisition price for a 60% interest in FSE, non-refundable down payment |  |  |  |  |  |  |  |  |  |  | 44.0 | 110.0 | 66.0 |  |  |
Pre-agreed acquisition, options to acquire |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |
Final Payment for a 60% interest in FSE |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 110.0 |  |
Option percentage currently not exercised |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |

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