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Assumption used to Value Shares (Detail) (ZAR) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Performance Shares |  |
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] |  |
Weighted average historical volatility (based on a statistical analysis of the share price on a weighted moving average basis for the expected term of the option) | 33.10% | 36.40%
Expected term (months) | 3 years | 3 years
Dividend yield | 4.60% | 1.60%
Weighted average fair value - Rand | 79.83 | 162.14
Performance Shares | US Interest Rates | 3 Year [Member] |  |
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] |  |
Weighted average risk free interest rate | 0.20% | 0.70%
Bonus Shares |  |
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] |  |
Weighted average historical volatility (based on a statistical analysis of the share price on a weighted moving average basis for the expected term of the option) | 32.00% | 29.40%
Dividend yield | 4.60% | 2.70%
Weighted average fair value - Rand | 72.42 | 115.61
Bonus Shares | Minimum |  |
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] |  |
Expected term (months) | 9 months | 9 months
Bonus Shares | Maximum |  |
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] |  |
Expected term (months) | 18 months | 18 months
Bonus Shares | SA Interest Rates | 3 Year [Member] |  |
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] |  |
Weighted average risk free interest rate | 4.10% | 5.50%

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- Definition The weighted average fair value of the share-based compensation awards/options. + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average expected volatility rate of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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