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Risk Management Activities - Market Risk - Commodity Price - Gold and Copper - Additional Information (Detail) $ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
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Dec. 31, 2018 USD ($) R / kg Ounce_of_Gold oz | Nov. 30, 2018 R / kg Ounce_of_Gold | Oct. 31, 2018 R / kg Ounce_of_Gold | Apr. 01, 2018 $ / oz oz | Mar. 31, 2018 AUD ($) $ / oz $ / oz oz | Feb. 28, 2018 USD ($) oz | Jan. 31, 2018 $ / oz oz | Nov. 30, 2017 R / kg Ounce_of_Gold $ / Tonne T | Dec. 31, 2019 $ / oz oz | Dec. 31, 2018 USD ($) $ / oz R / kg Ounce_of_Gold oz
Asia [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Marked-to-market value of the hedge | $ 8.4 |  |  |  |  |  |  |  |  | $ 8.4
Australia [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Total realized gain |  |  |  |  | $ 8.4 | $ 8.4 |  |  |  |
Commodity price risk [member] | Fair value hedges [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Forwards notional value for the period January 2019 to December 2019 | oz |  |  |  |  | 173,000 |  |  |  |  |
Commodity price risk [member] | Fair value hedges [member] | Floor rate [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Strike price of gold | $ / oz |  |  |  |  | 1,789 |  |  |  |  |
Commodity price risk [member] | Fair value hedges [member] | Interest rate caps [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Strike price of gold | $ / oz |  |  |  |  | 1,720 |  |  |  |  |
Commodity price risk [member] | Fair value hedges [member] | Peru [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Total realized gain |  |  |  |  |  |  |  |  |  | 4.8
Marked-to-market value of the hedge | 1.2 |  |  |  |  |  |  |  |  | 1.2
Number of tonnes committed under contract | T |  |  |  |  |  |  |  | 29,400 |  |
Commodity price risk [member] | Fair value hedges [member] | Peru [member] | Floor rate [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Strike price of copper | $ / Tonne |  |  |  |  |  |  |  | 6,600 |  |
Commodity price risk [member] | Fair value hedges [member] | Peru [member] | Interest rate caps [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Strike price of copper | $ / Tonne |  |  |  |  |  |  |  | 7,431 |  |
Commodity price risk [member] | Fair value hedges [member] | Ghana [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Forwards notional value for the period January 2019 to December 2019 | oz |  |  |  | 488,900 |  |  | 488,900 |  |  |
Total realized gain |  |  |  |  |  |  |  |  |  | 19.6
Marked-to-market value of the hedge | $ 2.4 |  |  |  |  |  |  |  |  | $ 2.4
Commodity price risk [member] | Fair value hedges [member] | Ghana [member] | Floor rate [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Strike price of gold | $ / oz |  |  |  | 1,300 |  |  | 1,300 |  |  |
Commodity price risk [member] | Fair value hedges [member] | Ghana [member] | Interest rate caps [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Strike price of gold | $ / oz |  |  |  | 1,418 |  |  | 1,418 |  |  |
Commodity price risk [member] | Fair value hedges [member] | Asia [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Forwards notional value for the period January 2019 to December 2019 | oz | 283,000 |  |  |  |  | 221,000 |  |  |  | 283,000
Strike price of gold |  |  |  |  |  | 1,714 |  |  |  | 1,751
Average strike rate | 1,751 |  |  |  |  |  |  |  |  |
Marked-to-market value of the hedge | $ (3.9) |  |  |  |  |  |  |  |  | $ (3.9)
Commodity price risk [member] | Fair value hedges [member] | Australia [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Forwards notional value for the period January 2019 to December 2019 | oz |  |  |  |  | 452,800 |  |  |  |  | 629,000
Commodity price risk [member] | Fair value hedges [member] | Australia [member] | Floor rate [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Strike price of gold | $ / oz |  |  |  |  | 1,703 |  |  |  |  | 1,778
Commodity price risk [member] | Fair value hedges [member] | Australia [member] | Interest rate caps [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Strike price of gold |  |  |  |  | 1,767 |  |  |  |  | 1,847
Abnormally large changes in asset prices or foreign exchange rates [member] | Commodity price risk [member] | Fair value hedges [member] | Asia [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Forwards notional value for the period January 2019 to December 2019 | oz |  |  |  |  |  |  |  |  | 456,000 |
Abnormally large changes in asset prices or foreign exchange rates [member] | Commodity price risk [member] | Fair value hedges [member] | Asia [Member] | Floor rate [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Strike price of gold | $ / oz |  |  |  |  |  |  |  |  | 1,869 |
Abnormally large changes in asset prices or foreign exchange rates [member] | Commodity price risk [member] | Fair value hedges [member] | Asia [Member] | Interest rate caps [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Strike price of gold | $ / oz |  |  |  |  |  |  |  |  | 1,800 |
South Africa [member] | Commodity price risk [member] | South deep [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Marked-to-market value of the hedge | (2.0) |  |  |  |  |  |  |  |  | $ (2.0)
South Africa [member] | Commodity price risk [member] | Fair value hedges [member] | South deep [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Total realized gain |  |  |  |  |  |  |  |  |  | 8.9
Marked-to-market value of the hedge | $ 0.4 |  |  |  |  |  |  |  |  | $ 0.4
Number of ounces committed under contract | Ounce_of_Gold | 99,615 | 69,543 | 69,543 |  |  |  |  | 63,996 |  |
Strike price of gold | R / kg | 616,581 | 615,103 | 615,103 |  |  |  |  |  |  |
South Africa [member] | Commodity price risk [member] | Fair value hedges [member] | Floor rate [member] | South deep [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Strike price of gold | R / kg |  |  |  |  |  |  |  | 600,000 |  |
South Africa [member] | Commodity price risk [member] | Fair value hedges [member] | Interest rate caps [member] | South deep [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Strike price of gold | R / kg |  |  |  |  |  |  |  | 665,621 |  |
South Africa [member] | Abnormally large changes in asset prices or foreign exchange rates [member] | Commodity price risk [member] | Fair value hedges [member] | South deep [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |
Number of ounces committed under contract | Ounce_of_Gold |  |  |  |  |  |  |  |  |  | 30,072
Strike price of gold | R / kg |  |  |  |  |  |  |  |  |  | 620,000

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