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Commitments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2010
--- | --- | --- | ---
Commitments and Contingencies Disclosure [Line Items] |  |  |
Guarantees | $ 1.7 | $ 2.2 | $ 2.6
Department of Minerals and Energy in South Africa |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Guarantees | 1.2 |  |
Guarantee Type, Other |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Guarantees | 0.5 |  |
Ghanaian and Australian Asset Retirement Obligation |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Guarantees | 56.3 | 49.3 | 45.0
Total Guarantees |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Guarantees | $ 1.7 |  |

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- Definition This item represents the amount of contractual guarantees measured at fair value to which the Company is obligated as of the balance sheet date. + References No definition available. + Details
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