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Accounting Policies - Summary of Significant Assumptions Used in the Group's Impairment Assessments (FVLCOD calculations) (Parenthetical) (Detail)	Dec. 31, 2017 USD_per_Ounce
Australia [member]
Disclosure of changes in accounting estimates [line items]
Resource value per ounce	293

X

- Definition

Resource value per ounce.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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X

- Details

Name:	srt_StatementGeographicalAxis=country_AU
Namespace Prefix:
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Period Type: