Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 1,480,158	$ 1,522,354
Other comprehensive loss	(8,259)	(2,666)
Balance	1,550,673	1,470,228
Foreign Currency Translation Reclassification Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(23,514)	(12,523)
Other comprehensive loss before reclassifications, net of tax	(8,779)	(4,659)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0	0
Other comprehensive loss	(8,779)	(4,659)
Balance	(32,293)	(17,182)
Unrealized Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	3,480	(1,845)
Other comprehensive loss before reclassifications, net of tax	1,037	2,100
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(515)	(70)
Other comprehensive loss	522	2,030
Balance	4,002	185
Amortization of Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	1,180	1,328
Other comprehensive loss before reclassifications, net of tax	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(2)	(37)
Other comprehensive loss	(2)	(37)
Balance	1,178	1,291
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(18,854)	(13,040)
Other comprehensive loss before reclassifications, net of tax	(7,742)	(2,559)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(517)	(107)
Other comprehensive loss	(8,259)	(2,666)
Balance	$ (27,113)	$ (15,706)