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Commitments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
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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