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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Property and equipment additions	$ 1,016	$ 779	$ 1,992	$ 1,201
Depreciation and amortization	2,452	2,749	4,648	5,520
Identifiable assets	418,392		418,392		$ 408,637
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	101	111	298	161
Depreciation and amortization	1,224	1,561	2,445	3,141
Identifiable assets	260,184		260,184		254,752
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	55	102	215	163
Depreciation and amortization	334	337	648	671
Identifiable assets	74,303		74,303		64,725
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	135	337	554	489
Depreciation and amortization	649	734	1,263	1,472
Identifiable assets	68,653		68,653		71,572
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	725	229	925	388
Depreciation and amortization	245	$ 117	292	$ 236
Identifiable assets	$ 15,252		$ 15,252		$ 17,588