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Tax Years Open for Assessments (Parenthetical) (Detail) - Latest Tax Year | 12 Months Ended
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Dec. 31, 2015
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 The number of years after filing that the tax authorities are allowed to reopen, examine and, if necessary, amend the tax returns. + References No definition available. + Details
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Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Period Type: |