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Share Capital - Additional Information (Detail) R / shares in Units, $ / shares in Units, $ in Millions, R in Billions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
May 25, 2017 $ / shares shares | May 24, 2017 $ / shares shares | Mar. 17, 2016 | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 ZAR (R) | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2016 ZAR (R) R / shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Shares authorised |  |  | 1,000,000,000 |  |  |  |  |
Par value per share | $ / shares |  |  | $ 0.50 |  |  |  |  |
Shares issued | $ | [1] |  |  |  |  |  | $ 151.5 |
Share placement price per share | R / shares |  |  |  |  |  |  |  | R 59.50
Top of range [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Buy back of ordinary shares during any financial year as percentage of issued share capital |  |  | 20.00% |  |  |  |  |
Top of Range Issued Share Capital [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Percentage of authorised but unissued share capital as percentage of issued share capital |  |  | 5.00% |  |  |  |  |
Private Placement [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Shares issued |  |  |  |  | $ 151.5 | R 2.3 | $ 151.5 | R 2.3
Number of shares issued |  |  |  |  |  |  | 38,857,913 |
Private Placement [member] | 50 Day Moving Average [Member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Percentage of discount on share price |  |  |  | 0.70% |  |  |  |
Private Placement [member] | 30 Day Volume Weighted Average [Member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Percentage of discount on share price |  |  |  | 6.00% |  |  |  |
Ordinary Shares [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Shares authorised |  |  | 1,000,000,000 |  |  |  |  |
No par value per share | $ / shares |  | $ 0 | $ 0 |  | $ 0 |  | $ 0 |
Increase in number of shares authorised |  | 2,000,000,000 |  |  |  |  |  |
Number of shares issued |  |  |  |  | 820,614,217 |  | 820,606,945 |
[1] | As Restated - Refer note 40 for further details.

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