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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, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
segment
Dec. 31, 2010
Dec. 31, 2009
Business Segments, Geographic Information, and Major Customers                      
Number of reportable operating business segments                 3    
Revenue:                      
Total revenue $ 9,323,947 $ 9,510,792 $ 8,708,709 $ 7,079,406 $ 5,828,777 $ 4,987,074 $ 4,397,275 $ 3,918,021 $ 34,622,854 $ 19,131,147 $ 11,295,177
Gross profit:                      
Gross profit 162,286 170,847 165,102 136,768 123,647 112,107 107,569 98,818 635,003 442,141 375,591
Income from operations:                      
Income from operations                 256,972 180,866 153,995
Depreciation and amortization                      
Total depreciation and amortization                 40,530 19,106 16,956
Capital expenditures:                      
Total capital expenditures                 19,492 15,188 6,493
Operating Segments
                      
Income from operations:                      
Income from operations                 304,442 218,955 183,876
Aviation Segment
                      
Revenue:                      
Total revenue                 12,866,019 7,132,749 4,049,565
Gross profit:                      
Gross profit                 306,112 215,130 163,730
Income from operations:                      
Income from operations                 146,411 118,351 75,462
Depreciation and amortization                      
Total depreciation and amortization                 23,392 5,105 5,391
Capital expenditures:                      
Total capital expenditures                 2,230 510 585
Marine Segment
                      
Revenue:                      
Total revenue                 14,565,086 9,220,998 6,040,643
Gross profit:                      
Gross profit                 195,109 165,344 168,890
Income from operations:                      
Income from operations                 95,982 84,656 97,636
Depreciation and amortization                      
Total depreciation and amortization                 3,942 4,178 3,288
Capital expenditures:                      
Total capital expenditures                 3,714 3,109 820
Land Segment
                      
Revenue:                      
Total revenue                 7,191,749 2,777,400 1,204,969
Gross profit:                      
Gross profit                 133,782 61,667 42,971
Income from operations:                      
Income from operations                 62,049 15,948 10,778
Depreciation and amortization                      
Total depreciation and amortization                 9,825 7,362 5,808
Capital expenditures:                      
Total capital expenditures                 3,031 1,243 476
Corporate
                      
Income from operations:                      
Corporate overhead                 47,470 38,089 29,881
Depreciation and amortization                      
Total depreciation and amortization                 3,371 2,461 2,469
Capital expenditures:                      
Total capital expenditures                 $ 10,517 $ 10,326 $ 4,612