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Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 74,139	$ 92,651
Income from Operations	12,150	1,350
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	39,973	53,709
Income from Operations	3,624	3,824
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	17,797	23,303
Income from Operations	1,369	2,898
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	16,207	15,816
Income from Operations	3,210	3,309
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales	162	(177)
Income from Operations	4,533	(8,011)
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Income from Operations	$ (586)	$ (670)

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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