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Goodwill - Additional Information (Detail) oz in Millions, R in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / oz R / kg oz | Dec. 31, 2017 ZAR (R) $ / oz R / kg oz | Dec. 31, 2016 USD ($) $ / oz R / kg oz | Dec. 31, 2015 USD ($)
Disclosure of information about Goodwill [Line Items] |  |  |  |
Impairment | $ | $ 277.8 |  | $ 0.0 | $ 0.0
Annual life of mine | 78 years | 78 years | 79 years |
Nominal discount rate | 13.50% | 13.50% | 13.50% |
Fair value of gold per resource ounce | 17.0 | 17.0 | 60.0 |
Resource ounces | oz | 29.0 | 29.0 | 26.0 |
South Deep Mine [member] |  |  |  |
Disclosure of information about Goodwill [Line Items] |  |  |  |
Impairment | $ 277.8 | R 3,495.0 |  |
Long-term gold price | R / kg | 525,000 | 525,000 |  |
Nominal discount rate | 13.50% | 13.50% |  |
Fair value of gold per resource ounce | 17 | 17 |  |
Rand [member] |  |  |  |
Disclosure of information about Goodwill [Line Items] |  |  |  |
Long-term gold price | R / kg | 525,000 | 525,000 | 600,000 |
Fair value of gold per resource ounce | 17 | 17 | 60 |
US Dollars [member] |  |  |  |
Disclosure of information about Goodwill [Line Items] |  |  |  |
Long-term gold price | 1,300 | 1,300 | 1,300 |

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- Definition The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B67_d_v&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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