Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 324,140	$ 316,011	$ 341,869
Engineered Systems Segment [Member]
Segment Reporting Information [Line Items]
Net sales	186,926	205,494	210,319
Industrial Process Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	137,214	110,517	131,550
Intra - Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(24,016)	(24,131)	(16,509)
Intra - Segment Sales [Member] | Engineered Systems Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(9,483)	(11,333)	(6,650)
Intra - Segment Sales [Member] | Industrial Process Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(14,533)	(12,798)	(9,859)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	350,266	342,837	360,445
Operating Segments [Member] | Engineered Systems Segment [Member]
Segment Reporting Information [Line Items]
Net sales	197,380	218,290	217,359
Operating Segments [Member] | Industrial Process Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	152,886	124,547	143,086
Inter-segment Elimination [Member] | Industrial Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(971)	(1,463)	(390)
Inter-segment Elimination [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(1,139)	(1,232)	(1,677)
Inter-segment Elimination [Member] | Engineered Systems Segment [Member] | Industrial Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(971)	(1,463)	(390)
Inter-segment Elimination [Member] | Industrial Process Solutions Segment [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	$ (1,139)	$ (1,232)	$ (1,677)