Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	$ 100,692	$ 100,086
Amortizable intangible assets, accumulated amortization	(73,699)	(67,316)
Amortizable intangible assets, net carrying amount	26,993	32,770
Weighted Average Remaining Life (Years)	5 years 4 months 24 days	6 years 3 months 18 days
Gross carrying amount	113,719	113,113
Accumulated amortization	(73,699)	(67,316)
Net carrying amount	40,020	45,797
Patents and acquired technology
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	61,667	61,279
Amortizable intangible assets, accumulated amortization	(50,904)	(47,350)
Amortizable intangible assets, net carrying amount	10,763	13,929
Weighted Average Remaining Life (Years)	3 years 10 months 24 days	4 years 9 months 18 days
Customer Relationships
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	33,245	33,115
Amortizable intangible assets, accumulated amortization	(18,981)	(16,514)
Amortizable intangible assets, net carrying amount	14,264	16,601
Weighted Average Remaining Life (Years)	6 years 6 months	7 years 6 months
Trademarks, trade names and other
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	5,780	5,692
Amortizable intangible assets, accumulated amortization	(3,814)	(3,452)
Amortizable intangible assets, net carrying amount	1,966	2,240
Weighted Average Remaining Life (Years)	6 years 2 months 12 days	7 years 2 months 12 days
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