Business Segment Information - Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Property and equipment additions		$ 767	$ 505	$ 1,432	$ 997
Depreciation and amortization		2,379	2,471	4,668	4,906
Identifiable assets		481,729		481,729		$ 416,197
Engineered Systems Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions		27	55	32	64
Depreciation and amortization		960	1,070	1,855	2,137
Identifiable assets		315,743		315,743		262,558
Industrial Process Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions		340	172	412	362
Depreciation and amortization		1,009	1,073	2,059	2,141
Identifiable assets		152,689		152,689		141,975
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Property and equipment additions		400	278	988	571
Depreciation and amortization		410	$ 328	754	$ 628
Identifiable assets	[1]	$ 13,297		$ 13,297		$ 11,664

[1] Corporate and Other assets consist primarily of cash and income tax related assets.