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Details of Performance Vesting Restricted Shares and Share Appreciation Rights Granted under Share Plan (Detail) |  |  |  | 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 ($) | Dec. 31, 2011 2005 Share Plan ZAR | Dec. 31, 2013 2005 Share Plan Restricted Stock | Dec. 31, 2012 2005 Share Plan Restricted Stock | Dec. 31, 2011 2005 Share Plan Restricted Stock | Dec. 31, 2013 2005 Share Plan Stock Appreciation Rights USD ($) | 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
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  |  |  |  |  | 4,986,216 | 7,369,112 | 7,650,081 | 4,318,909 | 4,318,909 | 5,030,143 | 5,030,143 | 5,270,597
Spin-off of Sibanye Gold - forfeited |  |  |  |  |  |  |  |  |  | (2,221,264) |  |  | (1,077,878) | (1,077,878) |  |  |
Granted during the period |  |  |  |  |  |  |  |  |  |  |  | 3,165,342 |  |  |  |  | 1,638,484
Additional awards due to spin-off of Sibanye |  |  |  |  |  |  |  |  |  | 538,562 |  |  | 465,346 | 465,346 |  |  |
Exercised and released |  |  |  |  |  |  |  |  |  | (1,857,614) | (1,798,082) | (2,559,552) |  |  | (259,455) | (259,455) | (1,247,317)
Forfeited |  |  |  |  |  |  |  |  |  | (214,929) | (584,814) | (886,759) | (554,649) | (554,649) | (451,779) | (451,779) | (631,621)
Ending Balance |  |  |  |  |  |  |  |  |  | 1,230,971 | 4,986,216 | 7,369,112 | 3,151,728 | 3,151,728 | 4,318,909 | 4,318,909 | 5,030,143
Average price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average price, at beginning of year |  |  | 119.17 | $ 12.53 | 107.37 | $ 13.27 | 107.91 | $ 15.63 | 105.53 |  |  |  | $ 12.53 | 107.37 |  |  |
Spin-off of Sibanye Gold - forfeited |  |  |  | $ 11.99 | 106.58 |  |  |  |  |  |  |  |  |  |  |  |
Granted during the period |  |  |  |  |  |  |  | $ 16.51 | 119.17 |  |  |  |  |  |  |  |
Additional awards due to spin-off of Sibanye |  |  |  | $ 10.72 | 95.34 |  |  |  |  |  |  |  |  |  |  |  |
Exercised and released |  |  |  |  |  | $ 12.99 | 106.36 | $ 15.38 | 111.06 |  |  |  |  |  |  |  |
Forfeited |  |  |  | $ 10.61 | 101.83 | $ 14.30 | 117.14 | $ 15.33 | 110.69 |  |  |  |  |  |  |  |
Average price, at end of year |  |  | 119.17 | $ 8.89 | 91.91 | $ 12.53 | 107.37 | $ 13.27 | 107.91 |  |  |  | $ 8.89 | 91.91 | $ 12.53 | 107.37 |

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- Definition Net number of share options (or share units) granted during the period after the spin-off of discontinued operations to uphold the rules of the share plans which require that the fair value of an employee's share portfolio pre and post corporate action remain the same. + References No definition available. + Details
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- Definition The number of shares under options that were canceled during the reporting period as a result of the spin-off of discontinued operations. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options relating to share options (or share units) granted during the period after the spin-off of discontinued operations to uphold the rules of the share plans which require that the fair value of an employee's share portfolio pre and post corporate action remain the same. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated due to the spin-off of discontinued operations. + References No definition available. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3) -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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