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BUSINESS SEGMENT INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenues        
Revenues $ 500,106 $ 443,029 $ 1,002,663 $ 824,790
Operating profit:        
Operating profit 119,858 119,267 250,715 225,593
Interest expense (650) (998) (1,246) (2,077)
Interest income 4 3 9 7
Other (expense) income, net (880) (10) 40 324
Income before income taxes 118,332 118,262 249,518 223,847
Identifiable assets at June 30, 2012 1,383,641   1,383,641  
Capital expenditures     204,202 203,763
Depreciation and amortization 53,950 44,893 105,520 84,430
Technical Services
        
Revenues        
Revenues 461,643 406,736 923,164 756,138
Operating profit:        
Operating profit 112,371 109,509 235,902 209,425
Identifiable assets at June 30, 2012 1,138,612   1,138,612  
Capital expenditures     168,976  
Depreciation and amortization     90,154  
Support Services
        
Revenues        
Revenues 38,463 36,293 79,499 68,652
Operating profit:        
Operating profit 12,543 13,154 26,528 23,089
Identifiable assets at June 30, 2012 194,979   194,979  
Capital expenditures     32,620  
Depreciation and amortization     15,189  
Corporate
        
Operating profit:        
Operating profit (3,152) (3,474) (8,407) (8,410)
Identifiable assets at June 30, 2012 50,050   50,050  
Capital expenditures     2,606  
Depreciation and amortization     177  
All other segment
        
Operating profit:        
Operating profit $ (1,904) $ 78 $ (3,308) $ 1,489