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Short-Term Investments - Maturities of Short-Term Investments (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 28, 2013 | Dec. 31, 2012
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Investments Debt And Equity Securities [Abstract] |  |
Less than one year | $ 53,589 | $ 76,779
Due in 1 - 2 years | 24,889 | 27,727
Total short-term investments, Estimated Fair Value | $ 78,478 | $ 104,506

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