Cash Equivalents and Investments - Company's Cash Equivalents and Investments Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	$ 240,741	$ 267,070
Money-market funds [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Cash equivalents measured at fair value	541,663	444,480
Asset-backed and mortgage-backed agency securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	132,122	142,756
Asset-backed and mortgage-backed non-agency securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	570	607
Government and agency securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	84,004	94,396
Corporate debt securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	15,050	15,490
Commercial paper [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	8,995	13,821
Long-term investments in equity securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	3,051	2,921
Level 1 [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	35,534	35,521
Level 1 [Member] | Money-market funds [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Cash equivalents measured at fair value	541,663	444,480
Level 1 [Member] | Government and agency securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	35,534	35,521
Level 1 [Member] | Long-term investments in equity securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	3,051	2,921
Level 2 [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	205,207	231,549
Level 2 [Member] | Asset-backed and mortgage-backed agency securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	132,122	142,756
Level 2 [Member] | Asset-backed and mortgage-backed non-agency securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	570	607
Level 2 [Member] | Government and agency securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	48,470	58,875
Level 2 [Member] | Corporate debt securities [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	15,050	15,490
Level 2 [Member] | Commercial paper [Member]
Company's Cash Equivalents and Investments measured at Fair Value [Line Items]
Investments measured at fair value	$ 8,995	$ 13,821