Cash Equivalents and Investments - Gross Unrealized Losses and Fair Values of Company's Short-Term Investments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous unrealized loss position, Less than 12 Months, Fair Value	$ 75,562	$ 96,967
Available-for-sale Securities, Continuous unrealized loss position, Less than 12 Months, Unrealized Losses	(1,523)	(2,099)
Available-for-sale Securities, Continuous unrealized loss position, Greater than 12 Months, Fair Value	17,484	11,668
Available-for-sale Securities, Continuous unrealized loss position, Greater than 12 Months, Unrealized Losses	(499)	(373)
Asset-backed and mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous unrealized loss position, Less than 12 Months, Fair Value	54,072	63,788
Available-for-sale Securities, Continuous unrealized loss position, Less than 12 Months, Unrealized Losses	(1,340)	(1,856)
Available-for-sale Securities, Continuous unrealized loss position, Greater than 12 Months, Fair Value	17,484	11,668
Available-for-sale Securities, Continuous unrealized loss position, Greater than 12 Months, Unrealized Losses	(499)	(373)
Government and agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous unrealized loss position, Less than 12 Months, Fair Value	18,507	27,053
Available-for-sale Securities, Continuous unrealized loss position, Less than 12 Months, Unrealized Losses	(160)	(201)
Available-for-sale Securities, Continuous unrealized loss position, Greater than 12 Months, Fair Value
Available-for-sale Securities, Continuous unrealized loss position, Greater than 12 Months, Unrealized Losses
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous unrealized loss position, Less than 12 Months, Fair Value	2,983	6,126
Available-for-sale Securities, Continuous unrealized loss position, Less than 12 Months, Unrealized Losses	(23)	(42)
Available-for-sale Securities, Continuous unrealized loss position, Greater than 12 Months, Fair Value
Available-for-sale Securities, Continuous unrealized loss position, Greater than 12 Months, Unrealized Losses