Schedule of Available for Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 730,528	$ 855,786
Available-for-sale marketable securities, Unrealized Gain	4,403	3,689
Available-for-sale marketable securities, Unrealized (Loss)	(713)	(1,515)
Available-for-sale marketable securities, Fair Market Value	734,218	857,960
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses	204,285	241,760
U.S. Government Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	191,856	202,573
Available-for-sale marketable securities, Unrealized Gain	92	75
Available-for-sale marketable securities, Unrealized (Loss)	(85)	(60)
Available-for-sale marketable securities, Fair Market Value	191,863	202,588
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses	91,951	84,498
U.S. Treasury Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	321,184	468,084
Available-for-sale marketable securities, Unrealized Gain	236	94
Available-for-sale marketable securities, Unrealized (Loss)	(124)	(283)
Available-for-sale marketable securities, Fair Market Value	321,296	467,895
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses	23,205	108,212
Commercial Paper
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	116,758	105,583
Available-for-sale marketable securities, Unrealized Gain	13	16
Available-for-sale marketable securities, Unrealized (Loss)	(4)	(1)
Available-for-sale marketable securities, Fair Market Value	116,767	105,598
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses	38,906	7,993
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	81,913	65,747
Available-for-sale marketable securities, Unrealized Gain	1,337	762
Available-for-sale marketable securities, Unrealized (Loss)	(463)	(1,122)
Available-for-sale marketable securities, Fair Market Value	82,787	65,387
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses	49,413	40,355
Equity And Debt Mutual Funds
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	11,483	10,463
Available-for-sale marketable securities, Unrealized Gain	2,725	2,742
Available-for-sale marketable securities, Unrealized (Loss)	(37)	(49)
Available-for-sale marketable securities, Fair Market Value	14,171	13,156
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses	810	702
Certificates of Deposit and Time Deposits
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	7,257	3,258
Available-for-sale marketable securities, Fair Market Value	7,257	3,258
Non-U.S. Government Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	77	78
Available-for-sale marketable securities, Fair Market Value	$ 77	$ 78