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Business Segment Information - Net Sales and Income (Loss) from Operation by Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 93,854	$ 88,256	$ 81,089	$ 74,139	$ 73,543	$ 84,987	$ 93,870	$ 92,651	$ 337,339	$ 345,051	$ 417,011
Income (loss) from operations									10,002	8,024	(25,562)
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									211,185	188,955	254,806
Income (loss) from operations									28,398	14,565	30,582
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									75,414	87,838	101,909
Income (loss) from operations									5,635	8,123	8,481
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									50,740	69,159	61,788
Income (loss) from operations									8,402	14,736	(36,209)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales										(901)	(1,492)
Income (loss) from operations									$ (32,433)	(26,649)	(26,817)
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations										$ (2,751)	$ (1,599)

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