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RESTRUCTURING CHARGES (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Changes to accrued liability balance related to restructuring charges        
Beginning balance     $ 1,776,000  
Additions for costs expensed 1,515,000 2,941,000 5,828,000 2,941,000
Less non-cash expenses     (83,000)  
Reductions for payments     (7,118,000)  
Ending balance 403,000   403,000  
Restructuring charges by segment        
Costs incurred in 2012     5,828,000  
Cumulative costs incurred     17,422,000  
Total expected costs     17,937,000  
Estimated additional charges     500,000  
North America contract operations
        
Restructuring charges by segment        
Costs incurred in 2012     605,000  
Cumulative costs incurred     658,000  
Total expected costs     658,000  
International contract operations
        
Restructuring charges by segment        
Costs incurred in 2012     622,000  
Cumulative costs incurred     1,124,000  
Total expected costs     1,423,000  
Aftermarket services
        
Restructuring charges by segment        
Costs incurred in 2012     460,000  
Cumulative costs incurred     882,000  
Total expected costs     882,000  
Fabrication
        
Restructuring charges by segment        
Costs incurred in 2012     798,000  
Cumulative costs incurred     2,372,000  
Total expected costs     2,422,000  
Other
        
Restructuring charges by segment        
Costs incurred in 2012     3,343,000  
Cumulative costs incurred     12,386,000  
Total expected costs     $ 12,552,000