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Changes in Accumulated Other Comprehensive Income (Loss) Balances (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 04, 2015 | Sep. 28, 2014 | Oct. 04, 2015 | Sep. 28, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income before reclassifications, tax |  |  | $ 0 |  |  |
Other comprehensive income before reclassifications, tax | $ 48 | $ (139) | (896) | $ 1,103 |  |
Other comprehensive income before reclassifications, tax |  |  |  | 0 |  |
Amounts reclassified from accumulated other comprehensive income, tax | (126) | (348) | (335) | (591) |  |
Amounts reclassified from accumulated other comprehensive income, tax | (42) | (42) | (127) | (127) |  |
Foreign currency translation adjustments, tax | 0 |  | 0 |  |  |
Unrealized gains (losses) on marketable securities, tax | 367 | 1,306 | 367 | 1,306 | $ 1,598 | $ 794
Retirement plans prior service benefit, tax | $ (580) | $ (411) | (580) | (411) | $ (453) | $ (284)
Unrealized Gains (Losses) on Marketable Securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), tax |  |  | (1,231) | 512 |  |
Retirement Plans Prior Service Benefit |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), tax |  |  | (127) | $ (127) |  |
Foreign currency translation reclassification adjustment |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), tax |  |  | $ 0 |  |  |

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