Revenue recognition - Schedule of Disaggregation of Net Sales By Reporting Unit (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation Of Revenue [Line Items]
Net sales	$ 35,887	$ 36,616	$ 73,858	$ 77,767
Security Products
Disaggregation Of Revenue [Line Items]
Net sales	28,213	25,672	58,100	53,014
Marine Components
Disaggregation Of Revenue [Line Items]
Net sales	$ 7,674	$ 10,944	$ 15,758	$ 24,753