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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						6 Months Ended	12 Months Ended
	Dec. 31, 2010 2005 Share Plan USD ($)	Dec. 31, 2010 2005 Share Plan ZAR	Dec. 31, 2012 2005 Share Plan USD ($)	Dec. 31, 2012 2005 Share Plan ZAR	Dec. 31, 2011 2005 Share Plan USD ($)	Dec. 31, 2011 2005 Share Plan ZAR	Jun. 30, 2010 2005 Share Plan USD ($)	Jun. 30, 2010 2005 Share Plan ZAR	Dec. 31, 2010 Restricted Stock 2005 Share Plan	Dec. 31, 2012 Restricted Stock 2005 Share Plan	Dec. 31, 2011 Restricted Stock 2005 Share Plan	Jun. 30, 2010 Restricted Stock 2005 Share Plan	Dec. 31, 2011 Stock Appreciation Rights ZAR	Dec. 31, 2010 Stock Appreciation Rights ZAR	Jun. 30, 2010 Stock Appreciation Rights ZAR	Dec. 31, 2010 Stock Appreciation Rights 2005 Share Plan	Dec. 31, 2012 Stock Appreciation Rights 2005 Share Plan USD ($)	Dec. 31, 2012 Stock Appreciation Rights 2005 Share Plan ZAR	Dec. 31, 2011 Stock Appreciation Rights 2005 Share Plan	Jun. 30, 2010 Stock Appreciation Rights 2005 Share Plan
Number of Options
Beginning Balance									8,438,663	7,369,112	7,650,081	6,831,964				5,660,272	5,030,143	5,030,143	5,270,597	4,609,626
Granted during the period									381,115		3,165,342	3,177,552				307,070			1,638,484	1,564,217
Exercised and released									(355,779)	(1,798,082)	(2,559,552)	(341,309)				(13,329)	(259,455)	(259,455)	(1,247,317)
Forfeited									(753,918)	(584,814)	(886,759)	(619,793)				(683,416)	(451,779)	(451,779)	(631,621)	(513,571)
Conditions for vesting not met									(60,000)			(609,751)
Ending Balance									7,650,081	4,986,216	7,369,112	8,438,663				5,270,597	4,318,909	4,318,909	5,030,143	5,660,272
Average price
Average price, at beginning of year	$ 14.00	106.00	$ 13.27	107.91	$ 15.63	105.53	$ 13.83	111.50					119.17	93.89	90.84
Granted during the period	$ 14.52	103.66			$ 16.51	119.17	$ 11.98	90.84
Exercised and released	$ 14.44	103.07	$ 12.99	106.36	$ 15.38	111.06
Forfeited	$ 14.57	104.01	$ 14.30	117.14	$ 15.33	110.69	$ 14.43	109.40
Conditions for vesting not met
Average price, at end of year	$ 15.63	105.53	$ 12.53	107.37	$ 13.27	107.91	$ 14.00	106.00					119.17	93.89	90.84		$ 12.53	107.48

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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.

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Gross number of share options (or share units) granted during the period.

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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.

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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.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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