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Earnings per Common Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Numerator:        
Net income attributable to World Fuel $ 48,600 $ 50,203 $ 95,015 $ 91,312
Denominator:        
Weighted average common shares for basic earnings per common share 71,173 70,856 71,083 70,400
Effect of dilutive securities (in shares) 594 702 690 899
Weighted average common shares for diluted earnings per common share 71,767 71,558 71,773 71,299
Weighted average securities which are not included in the calculation of diluted earnings per common share because their impact is anti-dilutive or their performance conditions have not been met (in shares) 774 124 422 70
Basic earnings per common share (in dollars per share) $ 0.68 $ 0.71 $ 1.34 $ 1.30
Diluted earnings per common share (in dollars per share) $ 0.68 $ 0.70 $ 1.32 $ 1.28