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Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]    
Net Sales to Outside Customers $ 57,170 $ 34,361
Air Pollution Control Segment [Member]
    
Segment Reporting Information [Line Items]    
Net Sales to Outside Customers 26,748 20,520
Energy Segment [Member]
    
Segment Reporting Information [Line Items]    
Net Sales to Outside Customers 15,281 12,023
Fluid Handling Filtration Segment [Member]
    
Segment Reporting Information [Line Items]    
Net Sales to Outside Customers 15,495 1,645
Corporate and Other [Member]
    
Segment Reporting Information [Line Items]    
Net Sales to Outside Customers (354) 173
Operating Segments [Member]
    
Segment Reporting Information [Line Items]    
Total Sales 60,114 35,785
Operating Segments [Member] | Air Pollution Control Segment [Member]
    
Segment Reporting Information [Line Items]    
Total Sales 28,084 22,086
Operating Segments [Member] | Energy Segment [Member]
    
Segment Reporting Information [Line Items]    
Total Sales 16,190 12,054
Operating Segments [Member] | Fluid Handling Filtration Segment [Member]
    
Segment Reporting Information [Line Items]    
Total Sales 15,840 1,645
Intra-segment [Member]
    
Segment Reporting Information [Line Items]    
Intra- Segment Sales (2,283) (1,185)
Intra-segment [Member] | Air Pollution Control Segment [Member]
    
Segment Reporting Information [Line Items]    
Intra- Segment Sales (1,029) (1,156)
Intra-segment [Member] | Energy Segment [Member]
    
Segment Reporting Information [Line Items]    
Intra- Segment Sales (909) (29)
Intra-segment [Member] | Fluid Handling Filtration Segment [Member]
    
Segment Reporting Information [Line Items]    
Intra- Segment Sales (345)  
Inter-segment Elimination [Member]
    
Segment Reporting Information [Line Items]    
Inter-segment Sales to Air Pollution Control   (2)
Inter-segment Sales by APC to Energy Segment (307) (16)
Inter-segment Sales to Fluid Handling Filtration   (394)
Inter-segment Sales to Corporate and Other (354) 173
Inter-segment Elimination [Member] | Air Pollution Control Segment [Member]
    
Segment Reporting Information [Line Items]    
Inter-segment Sales by APC to Energy Segment (307) (16)
Inter-segment Sales to Fluid Handling Filtration   (394)
Inter-segment Elimination [Member] | Energy Segment [Member]
    
Segment Reporting Information [Line Items]    
Inter-segment Sales to Air Pollution Control   (2)
Inter-segment Elimination [Member] | Corporate and Other [Member]
    
Segment Reporting Information [Line Items]    
Inter-segment Sales to Corporate and Other $ (354) $ 173