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Business Segment Information - Net Sales and Income from Operation by Business Segment (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
(Loss) income from operations (596) 1,018 4,603 9,651
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
(Loss) income from operations [1] (7,566) (7,797) (22,434) (21,299)
Engineered Systems Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales 44,779 49,709 130,196 149,429
(Loss) income from operations 4,301 7,276 16,105 24,479
Industrial Process Solutions Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales 35,200 27,716 100,355 83,652
(Loss) income from operations $ 2,669 $ 1,539 $ 10,932 $ 6,471
[1] Includes corporate compensation, professional services, information technology, and other general and administrative corporate expenses.