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Non-Current Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012
Schedule of Equity Method Investments [Line Items] |  |  |  |
Option percentage currently not exercised |  | 20.00% |  |
Far Southeast (FSE) Deposit | Lepanto Consolidated Mining Company |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Pre-agreed acquisition price for a 60% interest in FSE, option fees paid | $ 10.0 |  |  |
Far Southeast (FSE) Deposit | Liberty Express Assets |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership % |  |  |  | 40.00%
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% |  |  |
Pre-agreed acquisition price for a 60% interest in FSE |  |  |  | 110.0
Rand Refinery Limited |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership % |  | 34.90% | 34.90% |
Dividends received from Rand Refinery | $ 5.4 |  |  |
Rusoro Mining Limited |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership % |  | 26.40% | 26.40% |

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