Business Segment Information - Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Property and equipment additions	$ 423	$ 466
Depreciation and amortization	2,771	3,497
Identifiable assets	396,669		$ 392,582
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	50	18
Depreciation and amortization	1,580	2,158
Identifiable assets	261,164		245,842
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	61	75
Depreciation and amortization	334	286
Identifiable assets	59,058		55,582
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	152	273
Depreciation and amortization	738	990
Identifiable assets	72,621		72,507
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	160	100
Depreciation and amortization	119	$ 63
Identifiable assets	$ 3,826		$ 18,651