Goodwill And Other Intangible Assets (Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 37,883		$ 37,883		$ 37,883
Accumulated Amortization	(26,756)		(26,756)		(25,216)
Net Amount	11,127		11,127		12,667
Amortization expense	770	836	1,540	1,671
Current Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	12,718		12,718		12,718
Accumulated Amortization	(11,611)		(11,611)		(11,403)
Net Amount	1,107		1,107		1,315
Patent And Patent Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	23,392		23,392		23,392
Accumulated Amortization	(13,385)		(13,385)		(12,079)
Net Amount	10,007		10,007		11,313
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	1,773		1,773		1,773
Accumulated Amortization	(1,760)		(1,760)		(1,734)
Net Amount	$ 13		$ 13		$ 39