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Estimated Capital Allowances (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2014
Abosso Goldfields Limited
Operating Loss Carryforwards [Line Items]
Maximum number of years losses can be carried forward	5 years
Gold Fields Arctic Platinum Oy
Operating Loss Carryforwards [Line Items]
Maximum number of years losses can be carried forward	10 years

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Tax Loss Carryforwards, Maximum Period Carried Forward

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