Business Segment Information - Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Property and equipment additions		$ 2,616	$ 3,945	$ 5,655
Depreciation and amortization		9,853	9,921	10,609
Identifiable assets		416,197	419,314
Engineered Systems Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions		100	550	434
Depreciation and amortization		4,249	4,957	6,084
Identifiable assets		262,558	270,573
Industrial Process Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions		721	1,349	3,641
Depreciation and amortization		4,299	4,199	4,115
Identifiable assets		141,975	135,204
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Property and equipment additions		1,795	2,046	1,580
Depreciation and amortization		1,305	765	$ 410
Identifiable assets	[1]	$ 11,664	$ 13,537

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