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Business Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Item
Jun. 30, 2011
Business Segments        
Number of reportable operating business segments     3  
Revenue:        
Total revenue $ 9,618,797 $ 8,708,709 $ 19,097,852 $ 15,788,115
Gross profit:        
Gross profit 172,123 165,102 329,358 301,870
Income from operations:        
Income from operations 72,358 66,103 131,614 121,628
Operating Segments
        
Income from operations:        
Income from operations 82,243 77,413 152,721 143,601
Aviation segment
        
Revenue:        
Total revenue 3,547,871 3,364,829 6,959,418 6,011,421
Gross profit:        
Gross profit 69,171 82,027 134,085 152,155
Income from operations:        
Income from operations 25,960 37,624 52,793 75,794
Marine segment
        
Revenue:        
Total revenue 3,767,144 3,532,983 7,671,335 6,532,402
Gross profit:        
Gross profit 51,748 50,674 106,825 90,889
Income from operations:        
Income from operations 27,931 25,763 55,376 43,118
Land segment
        
Revenue:        
Total revenue 2,303,782 1,810,897 4,467,099 3,244,292
Gross profit:        
Gross profit 51,204 32,401 88,448 58,826
Income from operations:        
Income from operations 28,352 14,026 44,552 24,689
Corporate
        
Income from operations:        
Corporate overhead $ 9,885 $ 11,310 $ 21,107 $ 21,973