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Goodwill and Identifiable Intangible Assets (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Goodwill    
Balance at the beginning of the period $ 346,246,000 $ 287,434,000
Acquisition of business 123,193,000 44,526,000
Adjustment of purchase price allocations 1,757,000 15,192,000
Foreign currency translation of non-USD functional currency subsidiary goodwill (690,000) (906,000)
Balance at the end of the period 470,506,000 346,246,000
Aviation segment
    
Goodwill    
Balance at the beginning of the period 102,509,000 61,608,000
Acquisition of business 8,028,000 38,506,000
Adjustment of purchase price allocations (1,106,000) 2,395,000
Foreign currency translation of non-USD functional currency subsidiary goodwill (99,000)  
Balance at the end of the period 109,332,000 102,509,000
Goodwill segment reallocation (2,900,000)  
Marine segment
    
Goodwill    
Balance at the beginning of the period 70,522,000 71,220,000
Acquisition of business   1,963,000
Adjustment of purchase price allocations   (1,755,000)
Foreign currency translation of non-USD functional currency subsidiary goodwill (591,000) (906,000)
Balance at the end of the period 69,931,000 70,522,000
Land segment
    
Goodwill    
Balance at the beginning of the period 173,215,000 154,606,000
Acquisition of business 115,165,000 4,057,000
Adjustment of purchase price allocations 2,863,000 14,552,000
Balance at the end of the period 291,243,000 173,215,000
Goodwill segment reallocation $ 2,900,000