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Goodwill - Additional Information (Detail) oz in Millions, R in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) $ / oz R / kg oz | Dec. 31, 2018 ZAR (R) $ / oz R / kg oz | Dec. 31, 2017 USD ($) $ / oz R / kg oz | Dec. 31, 2017 ZAR (R) $ / oz R / kg oz | Dec. 31, 2016 USD ($) | Dec. 31, 2020 R / kg | Dec. 31, 2019 R / kg
Disclosure of information about Goodwill [line items] |  |  |  |  |  |  |  |  |  |
Impairment | $ | $ 71.7 |  |  | $ 277.8 |  |  | $ 0.0 |  |  |
Annual life of mine | 12 years |  | 12 years |  |  |  |  |  |  |
Nominal discount rate | 13.50% |  | 13.50% | 13.50% |  | 13.50% |  |  |  |
Resource ounces | oz | 24.5 |  | 24.5 | 29.0 |  | 29.0 |  |  |  |
Rand [member] |  |  |  |  |  |  |  |  |  |
Disclosure of information about Goodwill [line items] |  |  |  |  |  |  |  |  |  |
Nominal discount rate | 13.50% |  | 13.50% | 13.50% |  | 13.50% |  |  |  |
Fair value of gold per resource ounce | 17 |  | 17 | 17 |  | 17 |  |  |  |
South Deep Mine [member] |  |  |  |  |  |  |  |  |  |
Disclosure of information about Goodwill [line items] |  |  |  |  |  |  |  |  |  |
Long-term gold price | R / kg | 525,000 |  | 525,000 |  |  |  |  |  | 550,000 | 525,000
Nominal discount rate | 13.50% |  | 13.50% |  |  |  |  |  |  |
Fair value of gold per resource ounce | 17 |  | 17 |  |  |  |  |  |  |
Within one year [member] | Rand [member] |  |  |  |  |  |  |  |  |  |
Disclosure of information about Goodwill [line items] |  |  |  |  |  |  |  |  |  |
Long-term gold price | R / kg | 525,000 |  | 525,000 |  |  |  |  |  |  |
Within one year [member] | US Dollars [member] |  |  |  |  |  |  |  |  |  |
Disclosure of information about Goodwill [line items] |  |  |  |  |  |  |  |  |  |
Long-term gold price | 1,200 |  | 1,200 |  |  |  |  |  |  |
Later than one year [member] | Rand [member] |  |  |  |  |  |  |  |  |  |
Disclosure of information about Goodwill [line items] |  |  |  |  |  |  |  |  |  |
Long-term gold price | R / kg | 550,000 |  | 550,000 | 525,000 |  | 525,000 |  |  |  |
Annual life of mine | 75 years |  | 75 years | 78 years |  | 78 years |  |  |  |
Later than one year [member] | US Dollars [member] |  |  |  |  |  |  |  |  |  |
Disclosure of information about Goodwill [line items] |  |  |  |  |  |  |  |  |  |
Long-term gold price | 1,300 |  | 1,300 | 1,300 |  | 1,300 |  |  |  |
Annual life of mine | 75 years |  | 75 years | 78 years |  | 78 years |  |  |  |
Goodwill [member] | South Deep Mine [member] |  |  |  |  |  |  |  |  |  |
Disclosure of information about Goodwill [line items] |  |  |  |  |  |  |  |  |  |
Impairment | $ 71.7 | [1] | R 963.9 | $ 277.8 | [1] | R 3,495.0 | $ 0.0 | [1] |  |
[1] | For the year ended 31 December 2018, the Group recognised an impairment of R6,470.9 million (US$481.5 million) (2017: R3,495.0 billion (US$277.8 million) and 2016: Rnil (US$nil)) in respect of the South Deep cash-generating unit due to the deferral of production.

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