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GF Management Scheme Options Outstanding (Detail) (GF Management Incentive Scheme)	12 Months Ended														12 Months Ended									12 Months Ended
	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

X

- 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



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-Name Statement of Financial Accounting Standard (FAS)

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-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.



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X

- 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

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-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

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X

- 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

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-Publisher FASB

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X

- 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

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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.



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