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Segment Results and Assets (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Corporate expenditure $ 39.4 $ 38.2 $ 30.8
Environmental rehabilitation 10.4 13.9 11.1
Employee termination costs 35.5 6.1 0.8
Corporate and Other
      
Segment Reporting Information [Line Items]      
Impairments of investments and assets recognized 140.7    
Tarkwa Mine
      
Segment Reporting Information [Line Items]      
Impairments of investments and assets recognized 204.6    
Damang
      
Segment Reporting Information [Line Items]      
Impairments of investments and assets recognized 188.9    
St Ives
      
Segment Reporting Information [Line Items]      
Impairments of investments and assets recognized 264.9    
Cerro Corona
      
Segment Reporting Information [Line Items]      
Impairments of investments and assets recognized $ 10.4