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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Net income attributable to World Fuel $ 51,016 $ 48,600 $ 99,741 $ 95,015
Denominator:        
Weighted average common shares for basic earnings per common share 71,516 71,173 71,483 71,083
Effect of dilutive securities (in shares) 502 594 616 690
Weighted average common shares for diluted earnings per common share 72,018 71,767 72,099 71,773
Weighted average securities which are not included in the calculation of diluted earnings per common share (in shares) 468 774 461 422
Basic earnings per common share (in dollars per share) $ 0.71 $ 0.68 $ 1.40 $ 1.34
Diluted earnings per common share (in dollars per share) $ 0.71 $ 0.68 $ 1.38 $ 1.32