Stock-Based Compensation Expense - Stock-Based Compensation Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013	Dec. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 3,298,000	$ 2,220,000	$ 11,258,000	$ 8,299,000
Tax benefit from compensation expense	1,098,000	721,000	3,670,000	2,725,000
Recognized Period Costs Capitalized Amount	0		0		0
Product cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	242,000	160,000	795,000	564,000
Service cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	31,000	33,000	138,000	143,000
Research, development, and engineering
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	856,000	546,000	2,900,000	2,009,000
Selling, general, and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 2,169,000	$ 1,481,000	$ 7,425,000	$ 5,583,000