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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
Net income attributable to World Fuel $ 51,472 $ 51,494 $ 151,213 $ 146,509
Denominator:        
Weighted average common shares for basic earnings per common share 71,371 71,216 71,387 71,128
Effect of dilutive securities (in shares) 506 600 583 663
Weighted average common shares for diluted earnings per common share 71,877 71,816 71,970 71,791
Weighted average securities which are not included in the calculation of diluted earnings per common share (in shares) 457 452 455 307
Basic earnings per common share (in dollars per share) $ 0.72 $ 0.72 $ 2.12 $ 2.06
Diluted earnings per common share (in dollars per share) $ 0.72 $ 0.72 $ 2.10 $ 2.04