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Cash Equivalents and Investments - Contractual Maturities of Available-for-Sale Debt Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 29, 2013
Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]    
Due within one year $ 33,033  
Due in 1-5 years 93,749  
Due in 5-10 years 10,309  
Due after 10 years 131,291  
Total $ 268,382 $ 204,457