Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2012	Dec. 31, 2011
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	$ 100,622	$ 100,086
Amortizable intangible assets, accumulated amortization	(72,179)	(67,316)
Amortizable intangible assets, net carrying amount	28,443	32,770
Gross carrying amount	113,649	113,113
Accumulated amortization	(72,179)	(67,316)
Net carrying amount	41,470	45,797
Patents and acquired technology
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	61,622	61,279
Amortizable intangible assets, accumulated amortization	(50,067)	(47,350)
Amortizable intangible assets, net carrying amount	11,555	13,929
Customer relationships
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	33,230	33,115
Amortizable intangible assets, accumulated amortization	(18,382)	(16,514)
Amortizable intangible assets, net carrying amount	14,848	16,601
Trademarks, trade names and other
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	5,770	5,692
Amortizable intangible assets, accumulated amortization	(3,730)	(3,452)
Amortizable intangible assets, net carrying amount	2,040	2,240
Trade names
Schedule of Intangible Assets Disclosure [Line Items]
Non-amortizable intangible assets, gross carrying amount	13,027	13,027
Non-amortizable intangible assets, accumulated amortization
Non-amortizable intangible assets, net carrying amount	$ 13,027	$ 13,027