Annual report pursuant to Section 13 and 15(d)

Revenue Recognition - Net Sales Disaggregated by Product Line and Geographic Area (Detail)

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Revenue Recognition - Net Sales Disaggregated by Product Line and Geographic Area (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Disaggregation Of Revenue [Line Items]                      
Net sales $ 25,671 $ 27,154 $ 27,954 $ 16,710 $ 23,082 $ 25,286 $ 21,643 $ 20,593 $ 97,489 $ 90,604 $ 91,831
Asia [Member]                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 25,614 5,517 10,292
Canada [Member]                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 6,538 8,907 16,602
Middle East [Member]                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 4,843 13,112 2,610
South America [Member]                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 6,202 3,783 324
U.S. [Member]                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 52,724 58,042 59,441
All Other [Member]                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 1,568 1,243 2,562
Heat Transfer Equipment [Member]                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 41,133 31,986 24,785
Vacuum Equipment [Member]                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 36,792 33,354 34,461
All Other [Member]                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 $ 19,564 $ 25,264 $ 32,585