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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Property and equipment additions	$ 1,306	$ 165	$ 1,897	$ 806
Depreciation and amortization	3,195	3,937	10,097	12,105
Identifiable Assets	405,219		405,219		$ 438,549
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	6	74	38	426
Depreciation and amortization	2,031	2,379	6,286	7,314
Identifiable Assets	265,511		265,511		258,218
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	533	63	697	103
Depreciation and amortization	225	361	795	1,143
Identifiable Assets	55,511		55,511		66,723
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	767	17	1,051	236
Depreciation and amortization	835	1,168	2,683	3,563
Identifiable Assets	75,409		75,409		100,917
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Property and equipment additions		11	111	41
Depreciation and amortization	104	$ 29	333	$ 85
Identifiable Assets	$ 8,788		$ 8,788		$ 12,691