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Business Segment Information - Goodwill (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Goodwill $ 152,156 $ 166,951 $ 170,153
Energy Solutions Segment [Member]      
Segment Reporting Information [Line Items]      
Goodwill 97,930 98,408 101,610
Industrial Solutions Segment [Member]      
Segment Reporting Information [Line Items]      
Goodwill 22,419 22,419 $ 22,419
Fluid Handling Solutions Segment [Member]      
Segment Reporting Information [Line Items]      
Goodwill $ 31,807 $ 46,124