Components of and Changes in Accumulated Other Comprehensive Income, Net of Related Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Mar. 26, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 542,557
Other comprehensive income	201	$ 765
Ending Balance	573,743
Unrealized Holding (Losses) Gains on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(71)
Other comprehensive income	64
Ending Balance	(7)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,018)
Other comprehensive income	137
Ending Balance	(2,881)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,089)
Other comprehensive income	201
Ending Balance	$ (2,888)