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Business Segment Information - Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Property and equipment additions $ 466 $ 410  
Depreciation and amortization 3,497 4,138  
Identifiable Assets 422,119   $ 438,549
Energy Solutions Segment [Member]      
Segment Reporting Information [Line Items]      
Property and equipment additions 18 236  
Depreciation and amortization 2,158 2,518  
Identifiable Assets 275,550   258,218
Industrial Solutions Segment [Member]      
Segment Reporting Information [Line Items]      
Property and equipment additions 75 9  
Depreciation and amortization 282 391  
Identifiable Assets 62,816   66,723
Fluid Handling Solutions Segment [Member]      
Segment Reporting Information [Line Items]      
Property and equipment additions 273 149  
Depreciation and amortization 994 1,198  
Identifiable Assets 75,714   100,917
Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Property and equipment additions 100 16  
Depreciation and amortization 63 $ 31  
Identifiable Assets $ 8,039   $ 12,691