Derivative Instruments - Information Regarding Effect of Forward Contracts, Net of Underlying Exposure, on Consolidated Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) reclassified from accumulated other comprehensive income (loss) into net income	$ (44)	$ 0	$ (101)	$ 0
Designated as Hedging Instrument | Accumulated other comprehensive income (loss), net of tax
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) in Shareholders' equity on derivatives (effective portion)	32	0	32	0
Designated as Hedging Instrument | Product revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income (loss) into net income (effective portion)	(50)	0	(33)	0
Designated as Hedging Instrument | Research, development, and engineering expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income (loss) into net income (effective portion)	(15)	0	(40)	0
Designated as Hedging Instrument | Selling, general, and administrative expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income (loss) into net income (effective portion)	21	0	(28)	0
Designated as Hedging Instrument | Foreign currency gain (loss)
Information regarding the effect of the forward contracts, net of the underlying exposure, on the Consolidated Statements of Operations
Gains (losses) recognized in net income on derivatives (ineffective portion and discontinued derivatives)	0	0	0	0
Not Designated as Hedging Instrument | Foreign currency gain (loss)
Information regarding the effect of the forward contracts, net of the underlying exposure, on the Consolidated Statements of Operations
Gains (losses) recognized in net income	$ 425	$ (186)	$ 252	$ 10