Goodwill And Other Intangible Assets (Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 67,443		$ 67,443		$ 37,883
Accumulated Amortization	(28,426)		(28,426)		(25,216)
Net Amount	39,017		39,017		12,667
Amortization expense	1,670	843	3,210	2,514
Current Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	18,978		18,978		12,718
Accumulated Amortization	(11,975)		(11,975)		(11,403)
Net Amount	7,003		7,003		1,315
Patent And Patent Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	27,972		27,972		23,392
Accumulated Amortization	(14,175)		(14,175)		(12,079)
Net Amount	13,797		13,797		11,313
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	20,493		20,493		1,773
Accumulated Amortization	(2,276)		(2,276)		(1,734)
Net Amount	$ 18,217		$ 18,217		$ 39