Business and Geographic Segments - Business Segment Information by Geographical Areas (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Total net sales	$ 19,300	$ 21,300	$ 22,200	$ 20,400	$ 18,700	$ 20,100	$ 21,100	$ 19,900	$ 83,196	$ 79,815	$ 76,138
Total assets	150,183				141,526				150,183	141,526	160,072
Net property and equipment	33,727				51,127				33,727	51,127	59,903
United States [Member]
Segment Reporting Information [Line Items]
Net property and equipment	33,727				33,704				33,727	33,704	42,570
Canada [Member]
Segment Reporting Information [Line Items]
Net property and equipment					9,681					9,681	9,444
Taiwan [Member]
Segment Reporting Information [Line Items]
Net property and equipment					7,742					7,742	7,889
Point of destination [Member] | United States [Member]
Segment Reporting Information [Line Items]
Total net sales									78,268	75,594	71,993
Point of destination [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Total net sales									2,194	1,982	1,940
Point of destination [Member] | Mexico [Member]
Segment Reporting Information [Line Items]
Total net sales									1,249	1,060	904
Point of destination [Member] | Other [Member]
Segment Reporting Information [Line Items]
Total net sales									1,485	1,179	1,301
Security Products [Member]
Segment Reporting Information [Line Items]
Total net sales									73,715	71,397	68,005
Total assets	69,143				69,185				69,143	69,185	68,929
Furniture Components [Member]
Segment Reporting Information [Line Items]
Total assets					50,174					50,174	52,761
Marine Components [Member]
Segment Reporting Information [Line Items]
Total net sales									9,481	8,418	8,133
Total assets	9,689				10,531				9,689	10,531	11,337
Corporate and eliminations [Member]
Segment Reporting Information [Line Items]
Total assets	$ 71,351				$ 11,636				$ 71,351	$ 11,636	$ 27,045