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Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Net sales $ 86,961 $ 66,641 $ 167,946 $ 123,811
Air Pollution Control Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales 41,798 32,939 83,514 59,687
Energy Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales 27,303 16,835 51,652 32,116
Fluid Handling and Filtration Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales 17,745 16,650 32,939 32,145
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Net sales 115 217 (159) (137)
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net sales 91,737 70,791 176,109 130,905
Operating Segments [Member] | Air Pollution Control Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales 43,833 35,576 87,390 63,660
Operating Segments [Member] | Energy Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales 29,445 18,120 54,526 34,310
Operating Segments [Member] | Fluid Handling and Filtration Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales 18,459 17,095 34,193 32,935
Inter-segment Elimination [Member]        
Segment Reporting Information [Line Items]        
Net sales (3,735) (4,147) (6,689) (6,430)
Inter-segment Elimination [Member] | Air Pollution Control Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales (597) (44) (722) (44)
Inter-segment Elimination [Member] | Energy Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales (559) (15) (593) (322)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales   (161)   (161)
Inter-segment Elimination [Member] | Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Net sales 115 217 (159) (137)
Inter-segment Elimination [Member] | Air Pollution Control Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales (1,476) (2,461) (3,283) (3,490)
Inter-segment Elimination [Member] | Air Pollution Control Segment [Member] | Energy Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales (559) (15) (593) (322)
Inter-segment Elimination [Member] | Air Pollution Control Segment [Member] | Fluid Handling and Filtration Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales   (161)   (161)
Inter-segment Elimination [Member] | Energy Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales (1,560) (1,284) (2,255) (2,193)
Inter-segment Elimination [Member] | Energy Segment [Member] | Air Pollution Control Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales (582) (1) (619) (1)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales (699) (402) (1,151) (747)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member] | Air Pollution Control Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales (15) (43) (103) (43)
Inter-segment Elimination [Member] | Corporate and Other [Member] | Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 115 $ 217 $ (159) $ (137)