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Commitments - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Guarantees and Other Commitments [Line Items] |  |  |
Operating lease charges | $ 2.7 | $ 3.2 | $ 4.5
Environmental Guarantee Obligations |  |  |
Guarantees and Other Commitments [Line Items] |  |  |
Guarantees | 0.0 | 0.1 |
Environmental Guarantee Obligations | South African and Ghanaian Operations [Member] |  |  |
Guarantees and Other Commitments [Line Items] |  |  |
Guarantees | $ 59.0 | $ 67.0 |

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Details
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- Details
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