Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Net sales	$ 88,256	$ 84,987	$ 243,485	$ 271,508
(Loss) income from operations	(10,441)	5,630	4,272	16,235
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	56,552	44,279	147,661	150,487
(Loss) income from operations	8,156	5,921	17,682	20,280
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	20,258	21,638	56,379	67,737
(Loss) income from operations	1,638	1,523	4,279	6,356
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	11,446	20,105	39,445	54,269
(Loss) income from operations	1,836	4,299	7,234	11,756
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales		(1,035)		(985)
(Loss) income from operations	(21,911)	(5,403)	(24,691)	(20,349)
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
(Loss) income from operations	$ (160)	$ (710)	$ (232)	$ (1,808)