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Risk Management Activities - Schedule of Contractually Due Undiscounted Cash Flows Resulting from Maturities of All Financial Liabilities, Including Interest Payments (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) R / $	Dec. 31, 2016 USD ($) R / $		Dec. 31, 2015 USD ($)
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Funding from environmental trust funds | $	$ 55.5	$ 44.5	[1]	$ 35.0
Closing foreign exchange rate [member]
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Foreign exchange rate | R / $	12.58	14.03
Liquidity Risk [Member] | South Africa and Ghana [member]
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Funding from environmental trust funds | $	$ 55.5	$ 44.5
Liquidity Risk [Member] | US dollar borrowings [member]
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings interest rate description	Spot LIBOR (one month fix) rate adjusted by specific facility agreement 1.5638%	Spot LIBOR (one month fix) rate adjusted by specific facility agreement 0.75611%
Borrowings adjustment to interest rate	1.5638%	0.75611%
Liquidity Risk [Member] | Australian Dollar borrowings [member]
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings interest rate description	Spot Bank Bill Swap Bid Rate (BBSY) (one month fix) rate adjusted by specific facility agreement 1.76%
Borrowings adjustment to interest rate	1.76%
Liquidity Risk [Member] | Rand borrowing [member] | Uncommitted credit facility [member]
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings interest rate description	Spot JIBAR (one month fix) rate adjusted by specific facility agreement 6.908%
Borrowings adjustment to interest rate	6.908%
Average bank overnight borrowing rate on uncommitted credit facilities	8.30%	8.30%
Liquidity Risk [Member] | Closing foreign exchange rate [member]
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Foreign exchange rate | R / $	12.58	14.03
[1] As Restated - Refer note 40 for further details.

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The funds intended to fund environmental rehabilitation obligations of the entity and are not available for general purposes of the entity.

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- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2017-01-01
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The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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