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Summarize Information relating to Options Outstanding (Detail) |  |  |  |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2013 Stock Appreciation Rights ZAR | Dec. 31, 2012 Stock Appreciation Rights ZAR | Dec. 31, 2011 Stock Appreciation Rights ZAR | Dec. 31, 2013 2005 Share Plan USD ($) | Dec. 31, 2013 2005 Share Plan ZAR | Dec. 31, 2012 2005 Share Plan USD ($) | Dec. 31, 2012 2005 Share Plan ZAR | Dec. 31, 2011 2005 Share Plan USD ($) | Dec. 31, 2011 2005 Share Plan ZAR | Dec. 31, 2010 2005 Share Plan USD ($) | Dec. 31, 2010 2005 Share Plan ZAR | Dec. 31, 2013 2005 Share Plan Stock Appreciation Rights USD ($) | Dec. 31, 2013 2005 Share Plan Stock Appreciation Rights ZAR | Dec. 31, 2012 2005 Share Plan Stock Appreciation Rights USD ($) | Dec. 31, 2012 2005 Share Plan Stock Appreciation Rights ZAR | Dec. 31, 2011 2005 Share Plan Stock Appreciation Rights | Dec. 31, 2010 2005 Share Plan Stock Appreciation Rights | Dec. 31, 2013 2005 Share Plan Stock Appreciation Rights Range 1 USD ($) | Dec. 31, 2013 2005 Share Plan Stock Appreciation Rights Range 1 ZAR | Dec. 31, 2012 2005 Share Plan Stock Appreciation Rights Range 1 USD ($) | Dec. 31, 2012 2005 Share Plan Stock Appreciation Rights Range 1 ZAR | Dec. 31, 2013 2005 Share Plan Stock Appreciation Rights Range 2 USD ($) | Dec. 31, 2013 2005 Share Plan Stock Appreciation Rights Range 2 ZAR | Dec. 31, 2012 2005 Share Plan Stock Appreciation Rights Range 2 USD ($) | Dec. 31, 2012 2005 Share Plan Stock Appreciation Rights Range 2 ZAR | Dec. 31, 2013 2005 Share Plan Stock Appreciation Rights Range 3 USD ($) | Dec. 31, 2013 2005 Share Plan Stock Appreciation Rights Range 3 ZAR | Dec. 31, 2012 2005 Share Plan Stock Appreciation Rights Range 3 USD ($) | Dec. 31, 2012 2005 Share Plan Stock Appreciation Rights Range 3 ZAR | Dec. 31, 2013 2005 Share Plan Stock Appreciation Rights Range 4 USD ($) | Dec. 31, 2013 2005 Share Plan Stock Appreciation Rights Range 4 ZAR | Dec. 31, 2012 2005 Share Plan Stock Appreciation Rights Range 4 USD ($) | Dec. 31, 2012 2005 Share Plan Stock Appreciation Rights Range 4 ZAR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding SARS, Price range, lower limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.80 | 60.00 | $ 7.00 | 60.00 | $ 8.23 | 85.00 | $ 9.93 | 85.00 | $ 10.65 | 110.00 | $ 12.84 | 110.00 | $ 13.07 | 135.00 | $ 15.76 | 135.00
Outstanding SARS, Price range, upper limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.22 | 84.99 | $ 9.92 | 84.99 | $ 10.64 | 109.99 | $ 12.83 | 109.99 | $ 13.06 | 134.99 | $ 15.75 | 134.99 | $ 15.47 | 159.99 | $ 18.67 | 159.99
Outstanding SARS, Number of options |  |  |  |  |  |  |  |  |  |  |  | 3,151,728 | 3,151,728 | 4,318,909 | 4,318,909 | 5,030,143 | 5,270,597 | 873,064 | 873,064 | 3,400 | 3,400 | 1,217,915 | 1,217,915 | 2,625,234 | 2,625,234 | 1,033,784 | 1,033,784 | 1,652,471 | 1,652,471 | 26,965 | 26,965 | 37,804 | 37,804
Outstanding SARS, Weighted average exercise price |  |  | 119.17 | $ 8.89 | 91.91 | $ 12.53 | 107.37 | $ 13.27 | 107.91 | $ 15.63 | 105.53 | $ 8.89 | 91.91 | $ 12.53 | 107.37 |  |  | $ 7.33 | 75.81 | $ 8.11 | 69.48 | $ 9.00 | 93.10 | $ 11.60 | 99.45 | $ 10.00 | 103.36 | $ 13.96 | 119.65 | $ 11.46 | 118.45 | $ 15.90 | 136.29
Outstanding SARS, Contractual life |  |  |  |  |  |  |  |  |  |  |  | 2 years 1 month 2 days | 2 years 1 month 2 days | 3 years | 3 years |  |  | 2 years 2 months 19 days | 2 years 2 months 19 days | 1 year 11 months 12 days | 1 year 11 months 12 days | 10 months 24 days | 10 months 24 days | 2 years 6 months 7 days | 2 years 6 months 7 days | 3 years 4 months 2 days | 3 years 4 months 2 days | 3 years 8 months 19 days | 3 years 8 months 19 days | 4 years 4 days | 4 years 4 days | 5 years 4 days | 5 years 4 days

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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