Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2015	Sep. 26, 2014	Oct. 02, 2015	Sep. 26, 2014	Dec. 31, 2014
Equity [Abstract]
Foreign currency translation adjustments	$ (2,289)		$ (2,289)		$ (1,523)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(221)		(221)		311
Unrealized gain on investments	(757)		(757)		(768)
Accumulated Other Comprehensive Loss	(3,267)		(3,267)		$ (1,980)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	(364)	$ (670)	(766)	$ (440)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(550)	0	(218)	0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	(928)	(308)	17	(333)
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(967)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax			0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	$ (127)	$ 0	(314)	$ 0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax			0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			(314)
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax			0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax			0
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax			(6)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent			$ (6)