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Summarized Financial Information of Rusoro (Detail) (Rusoro Mining Limited, USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2011
Jun. 30, 2010
Rusoro Mining Limited
      
Schedule of Equity Method Investments [Line Items]      
Current assets $ 69.3 $ 72.2 $ 64.3
Non-current assets 957.3 917.8 956.7
Current liabilities 101.8 133.2 95.1
Non-current liabilities 346.9 208.7 355.5
Shareholders' equity excluding non controlling interest 576.7 646.0 570.4
Revenues 42.7 [1] 118.6 [1] 98.5 [1]
Gross (loss)/income 3.2 [1] (2.2) [1] 9.4 [1]
Net income/(loss) $ 7.4 [1] $ 0.3 [1] $ (117.6) [1]
[1] The results of Rusoro for the Gold Fields' fiscal year ended December 31, 2011 are for the nine months to September 2011 (six months ended December 31, 2010: three months ended September 30, 2010; fiscal year ended June 30, 2010).