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Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 78,680 | $ 75,170 | $ 150,572 | $ 155,656
Engineered Systems Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 43,360 | 49,074 | 85,417 | 99,720
Industrial Process Solutions Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 35,320 | 26,096 | 65,155 | 55,936
Intra - Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (8,794) | (6,919) | (13,942) | (15,391)
Intra - Segment Sales [Member] | Engineered Systems Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (3,513) | (2,984) | (5,887) | (7,790)
Intra - Segment Sales [Member] | Industrial Process Solutions Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (5,281) | (3,935) | (8,055) | (7,601)
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 88,314 | 82,807 | 165,723 | 172,306
Operating Segments [Member] | Engineered Systems Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 47,069 | 52,369 | 91,545 | 107,978
Operating Segments [Member] | Industrial Process Solutions Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 41,245 | 30,438 | 74,178 | 64,328
Inter-segment Elimination [Member] | Industrial Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (196) | (311) | (241) | (468)
Inter-segment Elimination [Member] | Energy Inter Segment Sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (644) | (407) | (968) | (791)
Inter-segment Elimination [Member] | Engineered Systems Segment [Member] | Industrial Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (196) | (311) | (241) | (468)
Inter-segment Elimination [Member] | Industrial Process Solutions Segment [Member] | Energy Inter Segment Sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ (644) | $ (407) | $ (968) | $ (791)

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