Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross carrying Amount	$ 166,405	$ 166,469
Accumulated amortization	119,198	110,016
Net carrying value	47,207	56,453
Weighted average life in years	9 years 3 months 18 days	9 years 3 months 18 days
Patents
Finite-Lived Intangible Assets [Line Items]
Gross carrying Amount	19,104	19,035
Accumulated amortization	18,226	17,985
Net carrying value	878	1,050
Weighted average life in years	9 years 1 month 6 days	9 years 1 month 6 days
Developed Technology Rights
Finite-Lived Intangible Assets [Line Items]
Gross carrying Amount	76,414	76,639
Accumulated amortization	59,147	56,524
Net carrying value	17,267	20,115
Weighted average life in years	7 years 6 months	7 years 6 months
Trademarks And Tradenames
Finite-Lived Intangible Assets [Line Items]
Gross carrying Amount	12,677	12,561
Accumulated amortization	6,633	5,579
Net carrying value	6,044	6,982
Weighted average life in years	12 years 1 month 6 days	12 years 1 month 6 days
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying Amount	56,700	56,630
Accumulated amortization	33,761	28,450
Net carrying value	22,939	28,180
Weighted average life in years	11 years 1 month 6 days	11 years 1 month 6 days
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross carrying Amount	1,510	1,604
Accumulated amortization	1,431	1,478
Net carrying value	$ 79	$ 126
Weighted average life in years	9 years 4 months 24 days	9 years