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Derivative Financial Instruments and Fair Value and Credit Risk of Financial Instruments - Additional information (Detail) $ in Millions			3 Months Ended	12 Months Ended
	Nov. 26, 2014 $ / bbl bbl	Sep. 10, 2014 $ / bbl bbl	Mar. 31, 2015 $ / bbl bbl	Dec. 31, 2015 USD ($) $ / T	Dec. 31, 2014 USD ($) $ / T	Dec. 31, 2013 USD ($) $ / T
Derivative [Line Items]
Transfers between levels of fair value hierarchy				There were no transfers during the years ended December, 31 2015 and 2014.
Commodity Contract
Derivative [Line Items]
Average recorded price net of refining charges (per ton) | $ / T				4,787	6,827	6,575
Applicable three month forward copper price | $ / T				4,650
Commodity cash settle and swap transaction, volume | bbl	283,500		63,000
Derivative contracts, price per barrel	96.00		94.00
Derivative contracts, percent of usage		50.00%
Derivative contracts, spot price per barrel		99.10
Commodity Contract | Product Sales
Derivative [Line Items]
Gain (loss) on mark-to-market value of contracts | $				$ (1.6)	$ (8.1)	$ (7.9)
Commodity Contract | London Metal Exchange
Derivative [Line Items]
LME copper prices, average price per ton | $ / T				5,376	6,861	7,324
Commodity Contract | Brent Crude
Derivative [Line Items]
Derivative contracts, spot price per barrel	78.50
Commodity Contract | Gold Fields Australia (Pty) Limited
Derivative [Line Items]
Commodity cash settle and swap transaction, volume | bbl		136,500
Derivative contracts, price per barrel		115.00
Energy Related Derivative
Derivative [Line Items]
Oil derivative contracts | $				$ 1.5	$ 10.3
Unionized Employees Concentration Risk [Member] | Workforce Subject to Collective Bargaining Arrangements [Member]
Derivative [Line Items]
Unionized workforce participation				76.00%
Unionized Employees Concentration Risk [Member] | Workforce Subject to Collective Bargaining Arrangements [Member] | Peru
Derivative [Line Items]
Unionized workforce participation				10.00%
Unionized Employees Concentration Risk [Member] | Workforce Subject to Collective Bargaining Arrangements [Member] | Australia
Derivative [Line Items]
Unionized workforce participation				0.00%
Unionized Employees Concentration Risk [Member] | Workforce Subject to Collective Bargaining Arrangements [Member] | South Africa
Derivative [Line Items]
Unionized workforce participation				93.00%
Unionized Employees Concentration Risk [Member] | Workforce Subject to Collective Bargaining Arrangements [Member] | Ghana
Derivative [Line Items]
Unionized workforce participation				96.00%

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Average recorded price net of refining charges.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The average forward price on the group of price risk forward or futures contracts, such as gas futures contracts.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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