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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Property and equipment additions	$ 779	$ 126	$ 1,201	$ 591
Depreciation and amortization	2,749	3,459	5,520	6,956
Identifiable assets	391,726		391,726		$ 392,582
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	111	15	161	32
Depreciation and amortization	1,561	2,190	3,141	4,348
Identifiable assets	252,051		252,051		245,842
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	102	90	163	165
Depreciation and amortization	337	208	671	494
Identifiable assets	57,839		57,839		55,582
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	337	11	489	284
Depreciation and amortization	734	999	1,472	1,989
Identifiable assets	71,461		71,461		72,507
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	229	10	388	110
Depreciation and amortization	117	$ 62	236	$ 125
Identifiable assets	$ 10,375		$ 10,375		$ 18,651