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RESTRUCTURING CHARGES (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Changes to accrued liability balance related to restructuring charges  
Beginning balance $ 1,776
Additions for costs expensed 3,047
Less non-cash expenses (83)
Reductions for payments (2,918)
Ending balance 1,822
Restructuring charges by segment  
Costs incurred in 2012 3,047
Cumulative costs incurred 14,674
Total expected costs 16,292
Estimated additional charges 1,600
North America contract operations
  
Restructuring charges by segment  
Costs incurred in 2012 400
Cumulative costs incurred 453
Total expected costs 653
International contract operations
  
Restructuring charges by segment  
Costs incurred in 2012 95
Cumulative costs incurred 597
Total expected costs 927
Aftermarket services
  
Restructuring charges by segment  
Costs incurred in 2012 66
Cumulative costs incurred 488
Total expected costs 538
Fabrication
  
Restructuring charges by segment  
Costs incurred in 2012 474
Cumulative costs incurred 2,048
Total expected costs 2,198
Other
  
Restructuring charges by segment  
Costs incurred in 2012 2,012
Cumulative costs incurred 11,088
Total expected costs $ 11,976