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Restructuring Charges (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Changes to accrued liability balance related to restructuring charges    
Beginning balance $ 1,776  
Additions for costs expensed 6,636 11,594
Less non-cash expenses (83) (1,575)
Reductions for payments (8,329) (8,243)
Ending balance   1,776
Restructuring charges by segment    
Costs incurred 6,636 11,594
Total costs incurred 18,230  
North America contract operations
    
Restructuring charges by segment    
Costs incurred 968 53
Total costs incurred 1,021  
International contract operations
    
Restructuring charges by segment    
Costs incurred 800 502
Total costs incurred 1,302  
Aftermarket services
    
Restructuring charges by segment    
Costs incurred 485 422
Total costs incurred 907  
Fabrication
    
Restructuring charges by segment    
Costs incurred 902 1,574
Total costs incurred 2,476  
Other
    
Restructuring charges by segment    
Costs incurred 3,481 9,043
Total costs incurred $ 12,524