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Earnings per Common Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Numerator:        
Net income attributable to World Fuel $ 51,494 $ 52,655 $ 146,509 $ 143,967
Denominator:        
Weighted average common shares for basic earnings per common share 71,216 70,939 71,128 70,593
Effect of dilutive securities (in shares) 600 648 663 822
Weighted average common shares for diluted earnings per common share 71,816 71,587 71,791 71,415
Weighted average securities which are not included in the calculation of diluted earnings per common share (in shares) 452 119 307 85
Basic earnings per common share (in dollars per share) $ 0.72 $ 0.74 $ 2.06 $ 2.04
Diluted earnings per common share (in dollars per share) $ 0.72 $ 0.74 $ 2.04 $ 2.02