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Provision Calculation using Undiscounted Closure Cost Estimates (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Asset Retirement Obligations [Line Items] |  |
Total closure cost estimate | $ 355.2 | $ 492.4
South Africa |  |
Asset Retirement Obligations [Line Items] |  |
Total closure cost estimate | 33.3 | 246.6
Ghana |  |
Asset Retirement Obligations [Line Items] |  |
Total closure cost estimate | 83.3 | 79.3
Australia |  |
Asset Retirement Obligations [Line Items] |  |
Total closure cost estimate | 196.6 | 125.1
Peru |  |
Asset Retirement Obligations [Line Items] |  |
Total closure cost estimate | $ 42.0 | $ 41.4

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- Definition Undiscounted amount of the accrual for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 1 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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