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Goodwill and Identifiable Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Goodwill    
Balance at the beginning of the period $ 287,434 $ 153,841
Acquisition of business 44,526 133,244
Adjustment of purchase price allocations - 2010 Acquisitions 15,192  
Foreign currency translation of Brazil subsidiary goodwill (906) 349
Balance at the end of the period 346,246 287,434
Marine Segment
    
Goodwill    
Balance at the beginning of the period 71,220 55,714
Acquisition of business 1,963 15,157
Adjustment of purchase price allocations - 2010 Acquisitions (1,755)  
Foreign currency translation of Brazil subsidiary goodwill (906) 349
Balance at the end of the period 70,522 71,220
Aviation Segment
    
Goodwill    
Balance at the beginning of the period 61,608 16,137
Acquisition of business 38,506 45,471
Adjustment of purchase price allocations - 2010 Acquisitions 2,395  
Balance at the end of the period 102,509 61,608
Land Segment
    
Goodwill    
Balance at the beginning of the period 154,606 81,990
Acquisition of business 4,057 72,616
Adjustment of purchase price allocations - 2010 Acquisitions 14,552  
Balance at the end of the period $ 173,215 $ 154,606