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Tax Years Open for Assessments (Detail) | 12 Months Ended
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Dec. 31, 2012
South Africa | Maximum |  |
Income Tax Examination [Line Items] |  |
Tax years open for assessments | 2011 | [1]
South Africa | Minimum |  |
Income Tax Examination [Line Items] |  |
Tax years open for assessments | 2001 | [1]
Australia | Maximum |  |
Income Tax Examination [Line Items] |  |
Tax years open for assessments | 2011 | [2]
Australia | Minimum |  |
Income Tax Examination [Line Items] |  |
Tax years open for assessments | 2002 | [2]
Peru | Maximum |  |
Income Tax Examination [Line Items] |  |
Tax years open for assessments | 2011 | [3]
Peru | Minimum |  |
Income Tax Examination [Line Items] |  |
Tax years open for assessments | 2005 | [3]
Ghana |  |
Income Tax Examination [Line Items] |  |
Tax years open for assessments | All years open | [4]
[1] | The South African Tax legislation allows the Revenue Authorities to reopen assessments issued for a period of up to 3 years after the assessments were issued.
[2] | The Australian Tax Authorities have the right to examine and, if necessary, amend the income tax determined by the relevant Group entity in the last four years, as from the date the tax returns have been filed.
[3] | The Peruvian Tax Authorities have the right to examine and, if necessary, amend the income tax determined by the relevant Group entity in the last four years, as from the date the tax returns have been filed.
[4] | The Ghanaian Tax Authorities have the right to examine and, if necessary, amend the income tax determined by the relevant Group entity for any year without limitation to the years which may be reassessed.

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- Definition A brief description of status of the tax examination, significant findings to date, and the entity's position with respect to the findings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Tax year that remains open to examination under enacted tax laws, in CCYY format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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