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Short-Term Investments - Summary of Short-Term Investments (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 26, 2014 | Dec. 31, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | $ 55,168 | $ 80,212
Gross Unrealized Gains | 31 | 62
Gross Unrealized Losses | (48) | (22)
Total short-term investments, Estimated Fair Value | 55,151 | 80,252
State, municipal and local government agencies bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 25,719 | 40,426
Gross Unrealized Gains | 26 | 38
Gross Unrealized Losses | (31) | (15)
Total short-term investments, Estimated Fair Value | 25,714 | 40,449
Corporate bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 26,150 | 33,483
Gross Unrealized Gains | 5 | 20
Gross Unrealized Losses | (17) | (7)
Total short-term investments, Estimated Fair Value | 26,138 | 33,496
Commercial paper [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 3,299 | 2,299
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Total short-term investments, Estimated Fair Value | 3,299 | 2,299
U.S. federal government bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 0 | 4,004
Gross Unrealized Gains | 0 | 4
Gross Unrealized Losses | 0 | 0
Total short-term investments, Estimated Fair Value | $ 0 | $ 4,008

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