Revenue recognition - Schedule of Disaggregates Net Sales By Reporting Unit (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation Of Revenue [Line Items]
Net sales	$ 36,616	$ 41,675	$ 77,767	$ 83,725
Security Products
Disaggregation Of Revenue [Line Items]
Net sales	25,672	28,837	53,014	58,418
Marine Components
Disaggregation Of Revenue [Line Items]
Net sales	$ 10,944	$ 12,838	$ 24,753	$ 25,307