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Business Segments, Geographic Information, and Major Customers (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounts receivable, net:      
Accounts receivable, net $ 2,193,866 $ 2,160,561  
Goodwill      
Goodwill 470,506 346,246 287,434
Identifiable intangible assets, net:      
Identifiable intangible assets, net 172,273 107,620  
Total assets:      
Total assets 4,107,751 3,697,246  
Aviation segment
      
Accounts receivable, net:      
Accounts receivable, net 674,973 569,086  
Allowance for bad debt 8,997 8,441  
Goodwill      
Goodwill 109,332 102,509 61,608
Identifiable intangible assets, net:      
Identifiable intangible assets, net 38,874 42,880  
Total assets:      
Total assets 1,463,423 1,149,031  
Marine segment
      
Accounts receivable, net:      
Accounts receivable, net 1,069,833 1,261,340  
Allowance for bad debt 7,742 9,495  
Goodwill      
Goodwill 69,931 70,522 71,220
Identifiable intangible assets, net:      
Identifiable intangible assets, net 6,656 8,659  
Total assets:      
Total assets 1,330,796 1,568,378  
Land segment
      
Accounts receivable, net:      
Accounts receivable, net 449,060 330,135  
Allowance for bad debt 6,980 6,365  
Goodwill      
Goodwill 291,243 173,215 154,606
Identifiable intangible assets, net:      
Identifiable intangible assets, net 126,743 56,081  
Total assets:      
Total assets 1,145,756 816,595  
Corporate
      
Total assets:      
Total assets $ 167,776 $ 163,242