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Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 79,979 | $ 77,425 | $ 230,551 | $ 233,081
Energy Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 17 | (111) | (985) | (902)
Engineered Systems Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 44,779 | 49,709 | 130,196 | 149,429
Industrial Process Solutions Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 35,200 | 27,716 | 100,355 | 83,652
Industrial Process Solutions Segment [Member] | Energy Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 17 | (111) | (985) | (902)
Intra-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (780) | (4,188) | (14,722) | (19,579)
Intra-Segment Sales [Member] | Engineered Systems Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (472) | (1,071) | (6,359) | (8,861)
Intra-Segment Sales [Member] | Industrial Process Solutions Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (308) | (3,117) | (8,363) | (10,718)
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 81,084 | 82,147 | 246,807 | 254,453
Operating Segments [Member] | Engineered Systems Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 45,559 | 51,203 | 137,104 | 159,181
Operating Segments [Member] | Industrial Process Solutions Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 35,525 | 30,944 | 109,703 | 95,272
Inter-Segment Elimination [Member] | Industrial Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (308) | (423) | (549) | (891)
Inter-Segment Elimination [Member] | Engineered Systems Segment [Member] | Industrial Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ (308) | $ (423) | $ (549) | $ (891)

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