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Goodwill and Identifiable Intangible Assets (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Identifiable intangible assets      
Gross Carrying Amount $ 241,662,000 $ 226,502,000  
Accumulated Amortization 95,632,000 73,236,000  
Net 146,030,000 153,266,000  
Total intangible assets, Gross carrying value 262,834,000 245,509,000  
Total intangible assets, Net carrying value 167,202,000 172,273,000  
Increase (decrease) goodwill 483,591,000 470,506,000 346,246,000
Intangible amortization expense 22,400,000 18,100,000 25,000,000
Future estimated amortization of identifiable intangible assets      
2014 21,426,000    
2015 18,823,000    
2016 16,512,000    
2017 14,443,000    
2018 13,041,000    
Thereafter 61,785,000    
Land segment
      
Identifiable intangible assets      
Total intangible assets, Net carrying value 129,840,000 126,743,000  
Increase (decrease) goodwill 298,996,000 291,243,000 173,215,000
Aviation segment
      
Identifiable intangible assets      
Total intangible assets, Net carrying value 31,632,000 38,874,000  
Increase (decrease) goodwill 115,507,000 109,332,000 102,509,000
2012 Acquisitions
      
Identifiable intangible assets      
Increase (decrease) goodwill   121,188,000  
Increase (decrease) identifiable intangible assets   87,150,000  
2012 Acquisitions | Land segment | Adjustment
      
Identifiable intangible assets      
Increase (decrease) goodwill (2,000,000)    
Increase (decrease) identifiable intangible assets 3,300,000    
Increase (decrease) in identifiable intangible assets (900,000)    
Increase in assumed liabilities 400,000    
2012 Acquisitions | Land segment | Reclassification
      
Identifiable intangible assets      
Increase (decrease) goodwill (6,500,000)    
2012 Acquisitions | Aviation segment | Reclassification
      
Identifiable intangible assets      
Increase (decrease) goodwill 6,500,000    
2011 Acquisitions
      
Identifiable intangible assets      
Increase (decrease) goodwill     46,282,000
Increase (decrease) identifiable intangible assets     23,414,000
2011 Acquisitions | Land segment | Reclassification
      
Identifiable intangible assets      
Increase (decrease) goodwill   2,900,000  
2011 Acquisitions | Aviation segment | Adjustment
      
Identifiable intangible assets      
Increase (decrease) goodwill   1,800,000  
Increase (decrease) identifiable intangible assets   (1,100,000)  
2011 Acquisitions | Aviation segment | Reclassification
      
Identifiable intangible assets      
Increase (decrease) goodwill   (2,900,000)  
Trademark/trade name rights
      
Identifiable intangible assets      
Indefinite lived Intangible Assets 21,172,000 19,007,000  
Customer relationships
      
Identifiable intangible assets      
Gross Carrying Amount 188,276,000 173,376,000  
Accumulated Amortization 79,688,000 61,562,000  
Net 108,588,000 111,814,000  
Supplier agreements
      
Identifiable intangible assets      
Gross Carrying Amount 33,648,000 33,248,000  
Accumulated Amortization 7,310,000 5,531,000  
Net 26,338,000 27,717,000  
Others
      
Identifiable intangible assets      
Gross Carrying Amount 19,738,000 19,878,000  
Accumulated Amortization 8,634,000 6,143,000  
Net $ 11,104,000 $ 13,735,000