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Short-Term Investments - Maturities of Short-Term Investments (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 27, 2014 | Dec. 31, 2013
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Investments, Debt and Equity Securities [Abstract] |  |
Less than one year | $ 52,594 | $ 55,278
Due in 1 - 2 years | 22,644 | 24,974
Total short-term investments, Estimated Fair Value | $ 75,238 | $ 80,252

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