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Summary Quarterly Information (Unaudited) (Details) (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
Summary of unaudited quarterly result                      
Revenue $ 9,935,813 $ 9,911,673 $ 9,618,797 $ 9,479,055 $ 9,323,947 $ 9,510,792 $ 8,708,709 $ 7,079,406 $ 38,945,338 $ 34,622,854 $ 19,131,147
Gross profit 163,337 180,752 172,123 157,235 162,286 170,847 165,102 136,768 673,447 635,003 442,141
Net income including noncontrolling interest 45,025 52,898 54,882 48,546 53,030 53,842 50,673 41,657 201,351 199,202 146,503
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
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