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Details of Performance Vesting Restricted Shares and Share Appreciation Rights Granted Under Share Plan (Detail) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended |
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Dec. 31, 2011 Stock Appreciation Rights ZAR | Dec. 31, 2010 Stock Appreciation Rights ZAR | Jun. 30, 2010 Stock Appreciation Rights ZAR | Jun. 30, 2009 Stock Appreciation Rights ZAR | Dec. 31, 2011 2005 Share Plan South Africa Rand ZAR | Dec. 31, 2010 2005 Share Plan South Africa Rand ZAR | Jun. 30, 2010 2005 Share Plan South Africa Rand ZAR | Jun. 30, 2009 2005 Share Plan South Africa Rand ZAR | Jun. 30, 2008 2005 Share Plan South Africa Rand ZAR | Dec. 31, 2011 2005 Share Plan U.S. Dollar USD ($) | Dec. 31, 2010 2005 Share Plan U.S. Dollar USD ($) | Jun. 30, 2010 2005 Share Plan U.S. Dollar USD ($) | Jun. 30, 2009 2005 Share Plan U.S. Dollar USD ($) | Jun. 30, 2008 2005 Share Plan U.S. Dollar USD ($) | Dec. 31, 2010 2005 Share Plan Restricted Stock | Dec. 31, 2011 2005 Share Plan Restricted Stock | Jun. 30, 2010 2005 Share Plan Restricted Stock | Jun. 30, 2009 2005 Share Plan Restricted Stock | Dec. 31, 2010 2005 Share Plan Stock Appreciation Rights | Dec. 31, 2011 2005 Share Plan Stock Appreciation Rights | Jun. 30, 2010 2005 Share Plan Stock Appreciation Rights | Jun. 30, 2009 2005 Share Plan Stock Appreciation Rights | Dec. 31, 2011 2005 Share Plan Stock Appreciation Rights South Africa Rand ZAR | Dec. 31, 2011 2005 Share Plan Stock Appreciation Rights U.S. Dollar USD ($)
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,438,663 | 7,650,081 | 6,831,964 | 5,396,887 | 5,660,272 | 5,270,597 | 4,609,626 | 3,837,937 |  |
Granted during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 381,115 | 3,165,342 | 3,177,552 | 2,616,171 | 307,070 | 1,638,484 | 1,564,217 | 1,311,271 |  |
Exercised and released |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (355,779) | (2,559,552) | (341,309) | (73,954) | (13,329) | (1,247,317) |  |  |  |
Forfeited |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (753,918) | (886,759) | (619,793) | (880,240) | (683,416) | (631,621) | (513,571) | (539,582) |  |
Conditions for vesting not met |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (60,000) |  | (609,751) | (226,900) |  |  |  |  |  |
Ending Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,650,081 | 7,369,112 | 8,438,663 | 6,831,964 | 5,270,597 | 5,030,143 | 5,660,272 | 4,609,626 |  |
Average price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted during the period |  |  |  |  | 119.17 | 103.66 | 90.84 | 108.90 |  | $ 16.51 | $ 14.52 | $ 11.98 | $ 12.09 |  |  |  |  |  |  |  |  |  |  |
Exercised and released |  |  |  |  | 111.06 | 103.07 |  |  |  | $ 15.38 | $ 14.44 |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited |  |  |  |  | 110.69 | 104.01 | 109.40 | 121.07 |  | $ 15.33 | $ 14.57 | $ 14.43 | $ 13.44 |  |  |  |  |  |  |  |  |  |  |
Conditions for vesting not met |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average price, at end of year | 119.17 | 93.89 | 90.84 | 108.90 | 107.91 | 105.53 | 106.00 | 111.50 | 112.73 | $ 13.27 | $ 15.63 | $ 14.00 | $ 13.83 | $ 14.09 |  |  |  |  |  |  |  |  | 107.91 | $ 13.27

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- Definition The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period. + 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)(e) -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)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period. + 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)(f) -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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(d) -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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period. + 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)(d) -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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The addition or reduction in the number of reserved shares that could potentially be issued under the option plan attributable to reasons other than grants, exercises, forfeitures, and expirations during the reporting period. + 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) -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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price at which grantees could acquire or could have acquired the underlying shares with respect to any other type of change in shares reserved for issuance under the stock option plan during the reporting period. + 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) -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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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