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Business Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
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Jun. 30, 2012
Business Segments        
Number of reportable operating business segments     3  
Revenue:        
Total revenue $ 10,479,604 $ 9,618,797 $ 20,663,633 $ 19,097,852
Gross profit:        
Gross profit 188,458 172,123 370,837 329,358
Income from operations:        
Income from operations 68,736 72,358 135,677 131,614
Operating Segments
        
Income from operations:        
Income from operations 79,057 82,243 156,576 152,721
Aviation segment
        
Revenue:        
Total revenue 3,745,070 3,547,871 7,675,658 6,959,418
Gross profit:        
Gross profit 76,041 69,171 153,025 134,085
Income from operations:        
Income from operations 33,873 25,960 68,753 52,793
Marine segment
        
Revenue:        
Total revenue 3,967,109 3,767,144 7,684,248 7,671,335
Gross profit:        
Gross profit 52,332 51,748 94,014 106,825
Income from operations:        
Income from operations 24,062 27,931 39,321 55,376
Land segment
        
Revenue:        
Total revenue 2,767,425 2,303,782 5,303,727 4,467,099
Gross profit:        
Gross profit 60,085 51,204 123,798 88,448
Income from operations:        
Income from operations 21,122 28,352 48,502 44,552
Corporate
        
Income from operations:        
Corporate overhead $ 10,321 $ 9,885 $ 20,899 $ 21,107