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Business Segment Information - Goodwill (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Goodwill $ 152,780 $ 166,951 $ 170,153
Energy Solutions Segment [Member]      
Segment Reporting Information [Line Items]      
Goodwill 98,554 98,408  
Industrial Solutions Segment [Member]      
Segment Reporting Information [Line Items]      
Goodwill 22,419 22,419  
Fluid Handling Solutions Segment [Member]      
Segment Reporting Information [Line Items]      
Goodwill $ 31,807 $ 46,124