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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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- Definition The funds intended to fund environmental rehabilitation obligations of the entity and are not available for general purposes of the entity. + References No definition available. + Details
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