Revenue recognition - Schedule of Disaggregates Net Sales By Reporting Unit (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation Of Revenue [Line Items]
Net sales	$ 41,675	$ 36,253	$ 83,725	$ 72,177
Security Products
Disaggregation Of Revenue [Line Items]
Net sales	28,837	27,587	58,418	53,472
Marine Components
Disaggregation Of Revenue [Line Items]
Net sales	$ 12,838	$ 8,666	$ 25,307	$ 18,705