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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, 2011
Jun. 30, 2010
Jun. 30, 2009
BASIC EARNINGS PER SHARE        
Net income attributable to Gold Fields shareholders $ 12.6 $ 881.5 $ 391.0 $ 160.9
Shares outstanding-beginning of year 705,903,511 720,796,887 704,749,849 653,200,682
Weighted average number of shares issued 5,108,162 1,579,341 614,351 17,127,580
Weighted average number of shares issued at the end of the year 711,011,673 722,376,228 705,364,200 670,328,262
Basic earnings per share $ 0.02 $ 1.22 $ 0.55 $ 0.24
DILUTED EARNINGS PER SHARE        
Net income attributable to Gold Fields shareholders $ 12.6 $ 881.5 $ 391.0 $ 160.9
Weighted average number of shares issued at the end of the year 711,011,673 722,376,228 705,364,200 670,328,262
Effect of dilutive securities 8,677,377 8,411,270 9,185,642 7,462,470
Weighted Average Number of Shares Outstanding, Diluted 719,689,050 730,787,498 714,549,842 677,790,732
Diluted earnings per share $ 0.02 $ 1.21 $ 0.55 $ 0.24