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Senior Secured Revolving Credit Facility (Detail) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended									12 Months Ended
	Dec. 31, 2010 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Jun. 30, 2010 USD ($)	Dec. 31, 2012 ZAR	Nov. 28, 2012 USD ($)	Nov. 28, 2012 ZAR	Nov. 16, 2012 ZAR	Oct. 24, 2012 USD ($)	Oct. 24, 2012 ZAR	Dec. 31, 2012 Collateralized $60 million senior secured revolving credit facility USD ($)	Dec. 31, 2011 Collateralized $60 million senior secured revolving credit facility USD ($)
Debt Instrument [Line Items]
Opening balance					3,000.0	$ 700.1	6,000.0	1,000.0	$ 58.3	500.0	$ 50.0
Long and short-term loans raised	1,543.8	1,451.0	1,167.9	1,619.9							23.0	70.0
Long and short-term loans repaid	(1,330.8)	(975.9)	(654.6)	(1,637.5)							(73.0)	(20.0)
Closing balance		$ 350.0			3,000.0	$ 700.1	6,000.0	1,000.0	$ 58.3	500.0		$ 50.0

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

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