Share-based Compensation Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 30, 2012	Sep. 28, 2013	Sep. 30, 2012
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Share-based compensation expense	$ 7,067,000	$ 1,693,000	$ 25,357,000	$ 2,329,000
Cost of revenue
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Share-based compensation expense	340,000	132,000	3,049,000	134,000
Research and development
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Share-based compensation expense	2,468,000	328,000	8,846,000	360,000
Sales and marketing
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Share-based compensation expense	2,735,000	473,000	8,427,000	559,000
General and administrative
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Share-based compensation expense	$ 1,524,000	$ 760,000	$ 5,035,000	$ 1,276,000