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Business Segment Information - Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Property and equipment additions $ 222 $ 296 $ 341 $ 711  
Depreciation and amortization 3,491 2,619 6,943 5,389  
Identifiable Assets 416,741   416,741   $ 414,365
Air Pollution Control Segment [Member]          
Segment Reporting Information [Line Items]          
Property and equipment additions 17 132 81 268  
Depreciation and amortization 1,104 383 2,257 778  
Identifiable Assets 132,457   132,457   133,899
Energy Segment [Member]          
Segment Reporting Information [Line Items]          
Property and equipment additions 139 33 179 67  
Depreciation and amortization 760 564 1,431 1,219  
Identifiable Assets 101,372   101,372   91,850
Fluid Handling and Filtration Segment [Member]          
Segment Reporting Information [Line Items]          
Property and equipment additions 63 119 68 333  
Depreciation and amortization 1,590 1,637 3,186 3,325  
Identifiable Assets 170,413   170,413   172,779
Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Property and equipment additions 3 12 13 43  
Depreciation and amortization 37 $ 35 69 $ 67  
Identifiable Assets $ 12,499   $ 12,499   $ 15,837