Geographic Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Jul. 01, 2011	Apr. 01, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Sales	$ 66,413	$ 69,520	$ 70,379	$ 65,186	$ 65,480	$ 78,704	$ 82,609	$ 77,503	$ 271,498	$ 304,296	$ 285,892
Percentage of Total									100.00%	100.00%	100.00%
UNITED STATES
Segment Reporting Information [Line Items]
Sales									86,310	102,792	95,223
Percentage of Total									31.80%	33.80%	33.30%
Asia-Pacific
Segment Reporting Information [Line Items]
Sales									67,717	72,201	82,558
Percentage of Total									24.90%	23.70%	28.90%
JAPAN
Segment Reporting Information [Line Items]
Sales									27,808	30,597	32,784
Percentage of Total									10.20%	10.10%	11.50%
Europe
Segment Reporting Information [Line Items]
Sales									81,815	91,637	73,460
Percentage of Total									30.10%	30.10%	25.70%
Other Country
Segment Reporting Information [Line Items]
Sales									$ 7,848	$ 7,069	$ 1,867
Percentage of Total									3.00%	2.30%	0.60%