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Nature of Business, Acquisitions, Significant Accounting Policies and Recent Accounting Pronouncements (Details 2) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator:                      
Net income attributable to World Fuel $ 42,836 $ 51,494 $ 48,600 $ 46,415 $ 50,062 $ 52,655 $ 50,203 $ 41,109 $ 189,345 $ 194,029 $ 146,865
Denominator:                      
Weighted average common shares for basic earnings per common share                 71,154 70,687 62,168
Effect of dilutive securities (in shares)                 663 823 1,273
Weighted average common shares for diluted earnings per common share                 71,817 71,510 63,441
Weighted average securities which are not included in the calculation of diluted earnings per common share (in shares)                 603 103 305
Basic earnings per common share (in dollars per share) $ 0.60 $ 0.72 $ 0.68 $ 0.65 $ 0.70 $ 0.74 $ 0.71 $ 0.59 $ 2.66 $ 2.74 $ 2.36
Diluted earnings per common share (in dollars per share) $ 0.60 $ 0.72 $ 0.68 $ 0.65 $ 0.70 $ 0.74 $ 0.70 $ 0.58 $ 2.64 $ 2.71 $ 2.31