Business Segment Information - Goodwill (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Goodwill	$ 161,820	$ 152,020	$ 152,156
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Goodwill	99,785	97,007	97,143
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Goodwill	30,458	23,436	23,436
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Goodwill	$ 31,577	$ 31,577	$ 31,577