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Derivative Financial Instruments and Fair Value and Credit Risk of Financial Instruments - Additional information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
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Jun. 30, 2013 bbl | Dec. 31, 2013 bbl | Dec. 31, 2012 | Dec. 31, 2011
Unionized Employees Concentration Risk [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Unionized workforce participation |  | 74.00% |  |
Unionized Employees Concentration Risk [Member] | Peru |  |  |  |
Derivative [Line Items] |  |  |  |
Unionized workforce participation |  | 14.00% |  |
Unionized Employees Concentration Risk [Member] | Australia |  |  |  |
Derivative [Line Items] |  |  |  |
Unionized workforce participation |  | 0.00% |  |
Unionized Employees Concentration Risk [Member] | South Africa |  |  |  |
Derivative [Line Items] |  |  |  |
Unionized workforce participation |  | 91.00% |  |
Unionized Employees Concentration Risk [Member] | Ghana |  |  |  |
Derivative [Line Items] |  |  |  |
Unionized workforce participation |  | 95.00% |  |
Commodity Contract |  |  |  |
Derivative [Line Items] |  |  |  |
LME copper prices, average price per ton |  | 7,324 | 7,951 | 8,836
LME copper prices, average provisional price (per ton) |  | 6,575 |  |
Applicable forward copper price |  | 7,142 |  |
Commodity cash settle and swap transaction, volume | 7,500 |  |  |
Derivative contracts, price per barrel | 115.00 |  |  |
Commodity cash settle and swap transaction outstanding, volume |  | 30,000 |  |
Commodity cash settle and swap transaction, mark-to-market value |  | $ 0.3 |  |
Commodity Contract | Sales |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) on mark-to-market value of contracts |  | $ (7.9) | $ 15.6 | $ (20.6)

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- Definition Commodity average provisional price + References No definition available. + Details
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- Definition Volume of Commodity Sold + References No definition available. + Details
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