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Directors Affected by GF Management Scheme Modification (Detail) (GF Management Incentive Scheme, ZAR) | Dec. 31, 2011 Year | Dec. 31, 2010 | Jun. 30, 2010 | Jun. 30, 2009 | Jun. 30, 2008
--- | --- | --- | --- | --- | ---
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Number of options | 311,225 | 976,533 | 1,352,633 | 2,304,421 | 4,212,219
Contractual life extended by (years) | 0.31 |  |  |  |
Nicholas J. Holland |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Number of options |  | 191,500 | 13,334 | 172,499 |
Weighted average price (Rand) |  | 75.44 | 46.23 | 76.59 |
Contractual life extended by (years) |  | 0.80 | 0.87 | 0.38 |
Paul Schmidt |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Number of options |  | 15,934 |  |  |
Weighted average price (Rand) |  | 74.75 |  |  |
Contractual life extended by (years) |  | 0.64 |  |  |
Kofi Ansah |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Number of options |  | 6,700 |  | 6,700 |
Weighted average price (Rand) |  | 68.59 |  | 68.59 |
Contractual life extended by (years) |  | 0.50 |  | 0.39 |
Rupert L. Pennant-Rea |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Number of options |  | 20,000 | 5,000 | 25,000 |
Weighted average price (Rand) |  | 78.49 | 110.03 | 84.79 |
Contractual life extended by (years) |  | 0.50 | 0.71 | 0.39 |
Chris I. Von Christierson |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Number of options |  | 10,000 | 10,000 | 20,000 |
Weighted average price (Rand) |  | 88.38 | 110.03 | 99.21 |
Contractual life extended by (years) |  | 0.50 | 0.71 | 0.39 |
Alan J. Wright |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Number of options |  |  | 10,000 | 55,000 |
Weighted average price (Rand) |  |  | 110.03 | 68.41 |
Contractual life extended by (years) |  |  | 0.71 | 0.39 |
Terence P. Goodlace |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Number of options |  |  |  | 3,167 |
Weighted average price (Rand) |  |  |  | 154.65 |
Contractual life extended by (years) |  |  |  | 0.01 |

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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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