Stock Incentive Plans - Stock-Based Compensation Expense Related to Stock Options, RSUs and Restricted Stock (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 9,073	$ 9,264	$ 9,169
Tax benefit for expense associated with non-qualified options	(1,298)	(1,234)	(1,321)
Total stock-based compensation expense, net of tax	7,775	8,030	7,848
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	465	422	412
Selling, General and Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	4,443	4,351	4,316
Research and Development Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	4,165	4,491	4,441
Operating Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 8,608	$ 8,842	$ 8,757