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Business Segments (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Accounts receivable, net:    
Accounts receivable, net $ 2,837,050 $ 2,538,642
Total assets:    
Total assets 5,523,665 4,739,277
Aviation Segment
    
Accounts receivable, net:    
Accounts receivable, net 833,478 771,178
Allowance for bad debt 7,121 9,351
Marine segment
    
Accounts receivable, net:    
Accounts receivable, net 1,243,994 1,205,005
Allowance for bad debt 10,063 9,845
Land Segment
    
Accounts receivable, net:    
Accounts receivable, net 759,578 562,459
Allowance for bad debt 10,845 9,992
Operating Segments | Aviation Segment
    
Total assets:    
Total assets 1,878,198 1,708,569
Operating Segments | Marine segment
    
Total assets:    
Total assets 1,680,701 1,553,267
Operating Segments | Land Segment
    
Total assets:    
Total assets 1,784,749 1,304,436
Corporate
    
Total assets:    
Total assets $ 180,017 $ 173,005