Accounts Receivable, net - Schedule of Account Receivable, net (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts Receivable Net [Line Items]
Allowance for doubtful accounts	$ (216)	$ (216)
Total accounts receivable, net	9,528	8,480
Security Products [Member]
Accounts Receivable Net [Line Items]
Accounts receivable, gross	8,871	7,952
Marine Components [Member]
Accounts Receivable Net [Line Items]
Accounts receivable, gross	$ 873	$ 744