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Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Intra- Segment Sales $ (3,398) $ (2,245) $ (9,828) $ (6,650)
Net Sales to Outside Customers 63,300 49,796 187,111 128,590
Air Pollution Control Segment [Member]
        
Segment Reporting Information [Line Items]        
Intra- Segment Sales (1,634) (1,206) (5,124) (4,911)
Net Sales to Outside Customers 27,709 23,441 87,396 68,030
Energy Segment [Member]
        
Segment Reporting Information [Line Items]        
Intra- Segment Sales (1,200) (839) (3,393) (1,539)
Net Sales to Outside Customers 17,977 19,243 50,093 50,262
Fluid Handling Filtration Segment [Member]
        
Segment Reporting Information [Line Items]        
Intra- Segment Sales (564) (200) (1,311) (200)
Net Sales to Outside Customers 17,584 6,895 49,729 9,785
Corporate and Other [Member]
        
Segment Reporting Information [Line Items]        
Net Sales to Outside Customers 30 217 (107) 513
Operating Segments [Member]
        
Segment Reporting Information [Line Items]        
Total Sales 67,289 52,694 198,194 136,047
Operating Segments [Member] | Air Pollution Control Segment [Member]
        
Segment Reporting Information [Line Items]        
Total Sales 29,920 24,858 93,580 73,579
Operating Segments [Member] | Energy Segment [Member]
        
Segment Reporting Information [Line Items]        
Total Sales 19,193 20,212 53,503 51,933
Operating Segments [Member] | Fluid Handling Filtration Segment [Member]
        
Segment Reporting Information [Line Items]        
Total Sales 18,176 7,208 51,111 10,119
Operating Segments [Member] | Corporate and Other [Member]
        
Segment Reporting Information [Line Items]        
Total Sales   416   416
Inter-segment Elimination [Member]
        
Segment Reporting Information [Line Items]        
Inter-Segment Sales to Air Pollution Control (44) (243) (88) (266)
Inter-Segment Sales by APC to Energy Segment (444) (211) (766) (239)
Inter-Segment Sales to Fluid Handling Filtration (133)   (294) (399)
Inter-Segment Sales to Corporate and Other 30 (199) (107) 97
Inter-segment Elimination [Member] | Air Pollution Control Segment [Member]
        
Segment Reporting Information [Line Items]        
Inter-Segment Sales by APC to Energy Segment (444) (211) (766) (239)
Inter-Segment Sales to Fluid Handling Filtration (133)   (294) (399)
Inter-segment Elimination [Member] | Energy Segment [Member]
        
Segment Reporting Information [Line Items]        
Inter-Segment Sales to Air Pollution Control (16) (130) (17) (132)
Inter-segment Elimination [Member] | Fluid Handling Filtration Segment [Member]
        
Segment Reporting Information [Line Items]        
Inter-Segment Sales to Air Pollution Control (28) (113) (71) (134)
Inter-segment Elimination [Member] | Corporate and Other [Member]
        
Segment Reporting Information [Line Items]        
Inter-Segment Sales to Corporate and Other $ 30 $ (199) $ (107) $ 97