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Borrowings - Schedule of Borrowings (Parenthetical) (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | $ 1,290,000,000 |  |  |  |
Profit on buy back of notes | 0 | $ 17,700,000 |  | $ 0 |
Carrying value of asset | 4,892,900,000 | 4,524,600,000 | [1] | $ 4,295,600,000 | [1]
Fleet assets and CIL plant [member] | Ghana [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Carrying value of asset | 183,600,000 | 95,500,000 |  |  |
US$70 million revolving senior secured credit facility [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 70,000,000 |  |  |  |
Amount available under the facility | 70,000,000 |  |  |  |
US$100 million revolving senior secured credit facility [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 100,000,000 |  |  |  |
Amount available under the facility | 100,000,000 |  |  |  |
US$1,510 Million Term Loan and Revolving Credit Facilities [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 1,510,000,000 |  |  |  |
Borrowing financed, description |  |  |  | These facilities were cancelled and refinanced through the US$1,290 million term loan and revolving credit facilities on 6 June 2016, resulting in the total amount available to be US$nil at 31 December 2016. |
Amount available under the facility |  | 0 |  |  |
US $1 Billion Notes [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 1,000,000,000 |  |  |  |
Unamortized transaction costs | 4,500,000 | 6,000,000 |  |  |
Profit on buy back of notes | 0 | $ 17,700,000 |  |  |
US$150 million revolving senior secured credit facility - old [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 150,000,000 |  |  |  |
US$150 million revolving senior secured credit facility - new [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 150,000,000 |  |  |  |
A$500 million syndicated revolving credit facility [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 500,000,000 |  |  |  |
Facility A (US $75 Million) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 75,000,000 |  |  |  |
Facility A (US $45 Million) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 45,000,000 |  |  |  |
Facility B (US $720 Million) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 720,000,000 |  |  |  |
Facility C (US $670 Million) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 670,000,000 |  |  |  |
Facility A (US $380 Million) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 380,000,000 |  |  |  |
Facility B (US $360 Million) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 360,000,000 |  |  |  |
Facility C (US $550 Million) [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 550,000,000 |  |  |  |
R 1,500 Million Nedbank Revolving Credit Facility [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 1,500,000,000 |  |  |  |
US$1,290 Million Term Loan and Revolving Credit Facilities [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 1,290,000,000 |  |  |  |
US $147.6 Million Notes [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Face amount of borrowings | 1,510,000,000 |  |  |  |
Purchase of notes, amount | 147,600,000 |  |  |  |
Purchase price per US$1,000 | $ 880 |  |  |  |
Borrowing financed, description | The purchase of the notes amounting to US$147.6 million was financed by drawing down under the US$1,510 million term loan and revolving credit facilities. The Group recognised a profit of US$17.7 million on the buy back of the notes. |  |  |  |
[1] | As Restated - Refer note 40 for further details.

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