Components of and Changes in Accumulated Other Comprehensive Income, Net of Related Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 721,469
Other comprehensive loss	(9,481)	$ 1,549
Ending Balance	627,095
Unrealized Holding (Losses) Gains on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	1,120
Other comprehensive loss	(1,579)
Ending Balance	(459)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,332)
Other comprehensive loss	(7,902)
Ending Balance	(11,234)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,212)
Other comprehensive loss	(9,481)
Ending Balance	$ (11,693)