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Valuation Allowance for Deferred Tax Assets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Valuation Allowance [Line Items]    
Valuation allowance for deferred tax assets $ 324.4 $ 152.4
Orogen Investments SA (Luxembourg)
    
Valuation Allowance [Line Items]    
Valuation allowance for deferred tax assets 37.9 39.2
Gold Fields Arctic Platinum Oy
    
Valuation Allowance [Line Items]    
Valuation allowance for deferred tax assets 28.8 30.3
Living Gold (Pty) Limited
    
Valuation Allowance [Line Items]    
Valuation allowance for deferred tax assets 4.8 3.9
Gold Fields Operations
    
Valuation Allowance [Line Items]    
Valuation allowance for deferred tax assets   33.2
GFI Joint Venture Holdings
    
Valuation Allowance [Line Items]    
Valuation allowance for deferred tax assets 252.3 44.6
Other
    
Valuation Allowance [Line Items]    
Valuation allowance for deferred tax assets $ 0.6 $ 1.2