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Events after the Reporting Date - Additional Information (Detail) $ in Millions | Feb. 14, 2018 R / shares | Jan. 24, 2018 USD ($)
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Dividends declared [member] |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Final dividend declared per share | R / shares | R 0.50 |
Sale o Arctic Platinum Project [member] |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Purchase consideration, cash |  | $ 40.0
Net smelter return, percentage |  | 2.00%
Royalty, capped percentage |  | 1.00%
Purchase consideration, royalty |  | $ 20.0
Royalty, uncapped percentage |  | 1.00%

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