Segment Information - Revenue by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Segment Reporting Information [Line Items]
Sales	$ 110,107	$ 101,949	$ 210,571	$ 212,514
United States [Member]
Segment Reporting Information [Line Items]
Sales	84,875	73,291	168,088	155,279
China [Member]
Segment Reporting Information [Line Items]
Sales	9,681	7,176	14,433	14,906
Singapore [Member]
Segment Reporting Information [Line Items]
Sales	11,987	20,810	22,492	40,237
Other [Member]
Segment Reporting Information [Line Items]
Sales	$ 3,564	$ 672	$ 5,558	$ 2,092