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Earnings Per Share (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2010
Jun. 30, 2009
Earnings Per Share Disclosure [Line Items]          
Shares outstanding - beginning of year 720,796,887   723,735,186 705,903,511 704,749,849
Net income attributable to Gold Fields shareholders $ 12.6 $ 654.3 $ 881.5 $ 391.0  
Weighted average number of shares issued 5,108,162 3,724,271 1,579,341 614,351  
Weighted average number of shares issued at the end of the year 711,011,673 727,459,457 722,376,228 705,364,200  
Basic earnings per share $ 0.02 $ 0.90 $ 1.22 $ 0.55  
Net income attributable to Gold Fields shareholders $ 12.6 $ 654.3 $ 881.5 $ 391.0  
Weighted average number of shares issued at the end of the year 711,011,673 727,459,457 722,376,228 705,364,200  
Effect of dilutive securities 8,677,377 3,264,493 8,411,270 9,185,642  
Weighted Average Number of Shares Outstanding, Diluted 719,689,050 730,723,950 730,787,498 714,549,842  
Diluted earnings per share $ 0.02 $ 0.90 $ 1.21 $ 0.55