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Business Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012 segment | Mar. 31, 2011
Business Segments |  |
Number of reportable operating business segments | 3 |
Revenue: |  |
Total revenue | $ 9,479,055 | $ 7,079,406
Gross profit: |  |
Gross profit | 157,235 | 136,768
Income from operations: |  |
Income from operations | 59,256 | 55,525
Operating Segments |  |
Income from operations: |  |
Income from operations | 70,478 | 66,188
Aviation segment |  |
Revenue: |  |
Total revenue | 3,411,547 | 2,646,592
Gross profit: |  |
Gross profit | 64,914 | 70,128
Income from operations: |  |
Income from operations | 26,833 | 38,170
Marine segment |  |
Revenue: |  |
Total revenue | 3,904,191 | 2,999,419
Gross profit: |  |
Gross profit | 55,077 | 40,215
Income from operations: |  |
Income from operations | 27,445 | 17,355
Land segment |  |
Revenue: |  |
Total revenue | 2,163,317 | 1,433,395
Gross profit: |  |
Gross profit | 37,244 | 26,425
Income from operations: |  |
Income from operations | 16,200 | 10,663
Corporate |  |
Income from operations: |  |
Corporate overhead | $ 11,222 | $ 10,663

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