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Restructuring - Net Pretax Benefits (Charges), Incurred by Segment (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
employee
Sep. 30, 2014
USD ($)
employee
Sep. 30, 2015
USD ($)
employee
Sep. 30, 2014
USD ($)
employee
Restructuring Cost and Reserve [Line Items]        
Approximate Number of Employees | employee 109 5 154 23
Restructuring charges $ 2,733 $ 2,006 $ 8,775 $ 2,372
Changes in estimates     (12)  
Total pretax charge, net of reversals 2,733 2,006 8,763 2,372
Refined Coal        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 0 0 0 0
Changes in estimates     0  
Total pretax charge, net of reversals 0 0 0 0
Emission Control - ACI        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 316 408 2,030 760
Changes in estimates     (10)  
Total pretax charge, net of reversals 316 408 2,020 760
Emissions Control - BCSI        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 364 0 364 0
Changes in estimates     0  
Total pretax charge, net of reversals 364 0 364 0
Research & Development        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 1,937 0 2,023 0
Changes in estimates     0  
Total pretax charge, net of reversals 1,937 0 2,023 0
All Other and Corporate        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 116 1,598 4,358 1,612
Changes in estimates     (2)  
Total pretax charge, net of reversals $ 116 $ 1,598 $ 4,356 $ 1,612