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GF Management Scheme Options Outstanding (Detail) (GF Management Incentive Scheme) | 12 Months Ended |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  | 12 Months Ended
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Dec. 31, 2011 ZAR Year | Dec. 31, 2010 | Jun. 30, 2010 | Jun. 30, 2009 | Jun. 30, 2008 | Dec. 31, 2011 Range 1 Year | Dec. 31, 2011 Range 2 Year | Dec. 31, 2011 Range 3 Year | Dec. 31, 2011 Range 4 Year | Dec. 31, 2011 South Africa Rand ZAR | Dec. 31, 2010 South Africa Rand ZAR | Jun. 30, 2010 South Africa Rand ZAR | Jun. 30, 2009 South Africa Rand ZAR | Jun. 30, 2008 South Africa Rand ZAR | Dec. 31, 2011 South Africa Rand Range 1 ZAR | Dec. 31, 2011 South Africa Rand Range 2 ZAR | Dec. 31, 2011 South Africa Rand Range 3 ZAR | Dec. 31, 2011 South Africa Rand Range 4 ZAR | Dec. 31, 2011 U.S. Dollar USD ($) | Dec. 31, 2010 U.S. Dollar USD ($) | Jun. 30, 2010 U.S. Dollar USD ($) | Jun. 30, 2009 U.S. Dollar USD ($) | Jun. 30, 2008 U.S. Dollar USD ($) | Dec. 31, 2011 U.S. Dollar Range 1 USD ($) | Dec. 31, 2011 U.S. Dollar Range 2 USD ($) | Dec. 31, 2011 U.S. Dollar Range 3 USD ($) | Dec. 31, 2011 U.S. Dollar Range 4 USD ($)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable options, Price range, lower limit | 60.40 |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00 | 85.00 | 110.00 | 135.00 |  |  |  |  |  | $ 7.38 | $ 10.46 | $ 13.53 | $ 16.61
Exercisable options, Contractual life (in years) | 0.31 |  |  |  |  | 0.24 | 0.34 | 1.03 | 1.16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable options, Price range, upper limit | 140.66 |  |  |  |  |  |  |  |  |  |  |  |  |  | 84.99 | 109.99 | 134.99 | 159.99 |  |  |  |  |  | $ 10.45 | $ 13.52 | $ 16.60 | $ 19.68
Exercisable options, Number of options | 311,225 | 976,533 | 1,352,633 | 2,304,421 | 4,212,219 | 260,926 | 28,499 | 14,000 | 7,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable options, Weighted average exercise price |  |  |  |  |  |  |  |  |  | 73.48 | 75.85 | 76.15 | 77.20 | 78.38 | 67.54 | 90.67 | 111.66 | 140.66 | $ 9.04 | $ 11.24 | $ 10.06 | $ 9.58 | $ 9.80 | $ 8.31 | $ 11.15 | $ 13.73 | $ 17.30

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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including 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 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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 + Details
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- Definition The weighted average price as of the beginning of the year 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e)(1) -SubTopic 10 -Topic 718 -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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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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