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Tax Years Open for Assessments (Detail)
 12 Months Ended
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.