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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Property and equipment additions	$ 883	$ 2,544	$ 2,875	$ 3,746
Depreciation and amortization	2,576	2,633	7,224	8,153
Identifiable assets	422,090		422,090		$ 408,637
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	148	57	446	218
Depreciation and amortization	1,245	1,544	3,690	4,684
Identifiable assets	265,858		265,858		254,752
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions		59	215	222
Depreciation and amortization	475	327	1,123	998
Identifiable assets	72,931		72,931		64,725
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	132	2,135	686	2,624
Depreciation and amortization	679	668	1,942	2,140
Identifiable assets	67,118		67,118		71,572
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	603	293	1,528	682
Depreciation and amortization	177	$ 94	469	$ 331
Identifiable assets	$ 16,183		$ 16,183		$ 17,588