Contractual Maturities of Available-for-Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities
Available for sale securities, Cost	$ 584,299	$ 663,625
Available for sale securities, Fair Market Value	586,421	667,388
Due In One Year Or Less
Schedule of Available-for-sale Securities
Available for sale securities, Cost	384,180
Available for sale securities, Fair Market Value	384,334
Due After One Year Through Five Years
Schedule of Available-for-sale Securities
Available for sale securities, Cost	173,407
Available for sale securities, Fair Market Value	175,657
Due After Five Years Through Ten Years
Schedule of Available-for-sale Securities
Available for sale securities, Cost	3,131
Available for sale securities, Fair Market Value	3,188
Due After Ten Years
Schedule of Available-for-sale Securities
Available for sale securities, Cost	23,581
Available for sale securities, Fair Market Value	23,242
Available-for-sale Securities
Schedule of Available-for-sale Securities
Available for sale securities, Cost	584,299
Available for sale securities, Fair Market Value	$ 586,421