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Business Segments, Geographic Information, and Major Customers (Details) (USD $)
In Thousands, 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
Item
Dec. 31, 2011
Dec. 31, 2010
Business Segments, Geographic Information, and Major Customers                      
Number of reportable operating business segments                 3    
Revenue:                      
Total 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:                      
Gross profit 163,337 180,752 172,123 157,235 162,286 170,847 165,102 136,768 673,447 635,003 442,141
Income from operations:                      
Income from operations                 257,023 256,972 180,866
Depreciation and amortization:                      
Depreciation and amortization                 36,714 40,530 19,106
Capital expenditures:                      
Total capital expenditures                 28,454 19,492 15,188
Operating Segments
                      
Income from operations:                      
Income from operations                 306,673 304,442 218,955
Aviation segment
                      
Revenue:                      
Total revenue                 14,692,042 12,866,019 7,132,749
Gross profit:                      
Gross profit                 294,601 306,112 215,130
Income from operations:                      
Income from operations                 128,153 146,411 118,351
Depreciation and amortization:                      
Depreciation and amortization                 17,381 23,392 5,105
Capital expenditures:                      
Total capital expenditures                 4,713 2,230 510
Marine segment
                      
Revenue:                      
Total revenue                 14,750,425 14,565,086 9,220,998
Gross profit:                      
Gross profit                 208,028 195,109 165,344
Income from operations:                      
Income from operations                 103,229 95,982 84,656
Depreciation and amortization:                      
Depreciation and amortization                 5,387 3,942 4,178
Capital expenditures:                      
Total capital expenditures                 8,981 3,714 3,109
Land segment
                      
Revenue:                      
Total revenue                 9,502,871 7,191,749 2,777,400
Gross profit:                      
Gross profit                 170,818 133,782 61,667
Income from operations:                      
Income from operations                 75,291 62,049 15,948
Depreciation and amortization:                      
Depreciation and amortization                 10,406 9,825 7,362
Capital expenditures:                      
Total capital expenditures                 7,243 3,031 1,243
Corporate
                      
Income from operations:                      
Corporate overhead                 49,650 47,470 38,089
Depreciation and amortization:                      
Depreciation and amortization                 3,540 3,371 2,461
Capital expenditures:                      
Total capital expenditures                 $ 7,517 $ 10,517 $ 10,326