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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]          
Property and equipment additions $ 3,638 $ 222 $ 3,848 $ 341  
Depreciation and amortization 5,132 3,491 10,328 6,943  
Identifiable Assets 591,702   591,702   $ 598,819
Environmental Segment [Member]          
Segment Reporting Information [Line Items]          
Property and equipment additions 115 17 228 81  
Depreciation and amortization 907 1,104 1,874 2,257  
Identifiable Assets 131,047   131,047   135,171
Energy Segment [Member]          
Segment Reporting Information [Line Items]          
Property and equipment additions 220 139 304 179  
Depreciation and amortization 2,939 760 5,741 1,431  
Identifiable Assets 270,196   270,196   283,002
Fluid Handling and Filtration Segment [Member]          
Segment Reporting Information [Line Items]          
Property and equipment additions 3,301 63 3,310 68  
Depreciation and amortization 1,254 1,590 2,648 3,186  
Identifiable Assets 161,378   161,378   161,394
Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Property and equipment additions 2 3 6 13  
Depreciation and amortization 32 $ 37 65 $ 69  
Identifiable Assets $ 29,081   $ 29,081   $ 19,252