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Business and Geographic Information - Schedule of Disaggregates Net Sales By Reporting Unit (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation Of Revenue [Line Items]                      
Total net sales $ 30,000 $ 28,400 $ 23,800 $ 32,300 $ 29,600 $ 29,700 $ 33,700 $ 31,200 $ 114,537 $ 124,243 $ 118,217
Security Products                      
Disaggregation Of Revenue [Line Items]                      
Total net sales                 87,863 99,328 98,383
Marine Components                      
Disaggregation Of Revenue [Line Items]                      
Total net sales                 $ 26,674 $ 24,915 $ 19,834