Revenue recognition - Schedule of Disaggregates Net Sales By Reporting Unit (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Net sales	$ 40,355	$ 42,864	$ 118,122	$ 126,589
Security Products
Disaggregation Of Revenue [Line Items]
Net sales	31,376	28,493	84,390	86,911
Marine Components
Disaggregation Of Revenue [Line Items]
Net sales	$ 8,979	$ 14,371	$ 33,732	$ 39,678