Stock-based Compensation Expense and the Related Tax Benefit Recognized in the Consolidated Statements of Income (Detail) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	$ 5,437	$ 6,088	$ 19,313	$ 19,010
Income tax benefit	(1,574)	(1,900)	(5,565)	(5,993)
Total stock-based compensation expense after income taxes	3,863	4,188	13,748	13,017
Cost of goods sold
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	941	969	2,462	2,836
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,152	1,213	3,997	3,734
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 3,344	$ 3,906	$ 12,854	$ 12,440