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Earnings per Common Share (Details) (USD $)
In Thousands, except Per Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Numerator:        
Net income attributable to World Fuel (in dollars) $ 50,203 $ 36,977 $ 91,312 $ 70,680
Denominator:        
Weighted average common shares for basic earnings per common share 70,856 59,418 70,400 59,371
Effect of dilutive securities 702 1,267 899 1,275
Weighted average common shares for diluted earnings per common share 71,558 60,685 71,299 60,646
Weighted average anti-dilutive securities which are not included in the calculation of diluted earnings per common share 124 297 70 205
Basic earnings per common share (in dollars per share) $ 0.71 $ 0.62 $ 1.30 $ 1.19
Diluted earnings per share (in dollars per share) $ 0.70 $ 0.61 $ 1.28 $ 1.17