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Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 89,413	$ 85,266	$ 81,179	$ 86,011	$ 93,854	$ 88,256	$ 81,089	$ 74,139	$ 341,869	$ 337,339	$ 345,051
Income (loss) from operations									17,990	10,002	8,024
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									210,319	211,185	188,955
Income (loss) from operations									33,886	28,797	14,565
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									91,347	80,699	93,960
Income (loss) from operations									5,679	6,308	8,800
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									40,203	45,455	63,037
Income (loss) from operations									5,558	7,730	14,059
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales											(901)
Income (loss) from operations									$ (27,133)	$ (32,833)	(26,649)
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations											$ (2,751)

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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-Topic 606
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