Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Apr. 01, 2016	Dec. 31, 2016
Equity [Abstract]
Foreign currency translation adjustments	$ (6,378)		$ (7,267)
Unrealized gain on investments	(225)		276
Actuarial Loss	(279)		(279)
Accumulated Other Comprehensive Loss	(6,882)		$ (7,270)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	889	$ 1,934
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	(499)	$ 79
Other Comprehensive Income (Loss), before Reclassifications, before Tax	390
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax	0
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	(2)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	$ (2)