Business Segment Information - Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Property and equipment additions	$ 3,945	$ 5,655	$ 3,090
Depreciation and amortization	9,921	10,609	13,272
Identifiable assets	419,314	408,637
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	550	434	205
Depreciation and amortization	4,957	6,084	8,112
Identifiable assets	270,573	254,752
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	371	402	756
Depreciation and amortization	1,589	1,320	1,067
Identifiable assets	69,465	64,725
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	978	3,239	1,226
Depreciation and amortization	2,610	2,795	3,517
Identifiable assets	65,739	71,572
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	2,046	1,580	903
Depreciation and amortization	765	410	$ 576
Identifiable assets	$ 13,537	$ 17,588