Business Segment Information - Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Property and equipment additions		$ 934	$ 743	$ 2,367	$ 1,740
Depreciation and amortization		2,941	2,467	7,609	7,373
Identifiable assets		486,229		486,229		$ 416,197
Engineered Systems Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions		96	15	128	79
Depreciation and amortization		1,398	1,061	3,253	3,198
Identifiable assets		320,261		320,261		262,558
Industrial Process Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions		330	241	743	603
Depreciation and amortization		1,153	1,070	3,212	3,212
Identifiable assets		149,311		149,311		141,975
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Property and equipment additions		508	487	1,496	1,058
Depreciation and amortization		390	$ 336	1,144	$ 963
Identifiable assets	[1]	$ 16,657		$ 16,657		$ 11,664

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