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Business Segments (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Accounts receivable, net:    
Accounts receivable, net $ 2,514,683 $ 2,193,866
Total assets:    
Total assets 4,656,400 4,107,751
Corporate
    
Total assets:    
Total assets 191,107 167,776
Operating Segments | Aviation segment
    
Accounts receivable, net:    
Accounts receivable, net 725,468 674,973
Allowance for bad debt 10,304 8,997
Total assets:    
Total assets 1,715,578 1,463,423
Operating Segments | Marine segment
    
Accounts receivable, net:    
Accounts receivable, net 1,186,126 1,069,833
Allowance for bad debt 9,314 7,742
Total assets:    
Total assets 1,454,056 1,330,796
Operating Segments | Land segment
    
Accounts receivable, net:    
Accounts receivable, net 603,089 449,060
Allowance for bad debt 7,391 6,980
Total assets:    
Total assets $ 1,295,659 $ 1,145,756