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Tax Years Open for Assessments (Parenthetical) (Detail) (Maximum) | 12 Months Ended
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Dec. 31, 2011
SOUTH AFRICA |
Income Tax Examination [Line Items] |
Revenue Authorities tax examination period | 3 years
AUSTRALIA |
Income Tax Examination [Line Items] |
Revenue Authorities tax examination period | 4 years
PERU |
Income Tax Examination [Line Items] |
Revenue Authorities tax examination period | 4 years

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- Definition Income Tax Examination, Years Subject to Examination + References No definition available. + Details
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- Details
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Period Type: | duration