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Commitments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Commitments and Contingencies Disclosure [Line Items] |  |
Guarantees | $ 0.1 | $ 0.5
South African, Ghanaian and Australian Asset Retirement Obligation |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Guarantees | 121.1 | 193.8
Guarantee Obligations |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Guarantees | $ 0.1 | $ 0.5

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- Definition Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12201-110248 + Details
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