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Changes in Accumulated Other Comprehensive Income (Loss) Balances (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 02, 2016 | Oct. 04, 2015 | Oct. 02, 2016 | Oct. 04, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss), tax | $ (196) | $ (168) | $ (257) | $ (462) |  |
Foreign currency translation adjustments, tax | 0 | 0 | 0 | 0 | $ 0 | $ 0
Unrealized gains on marketable securities, tax | 1,794 | 367 | 1,794 | 367 | (459) | 1,598
Retirement plans prior service benefit, tax | (727) | (580) | (727) | (580) | $ (622) | $ (453)
Foreign currency translation reclassification adjustments |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications, tax |  |  | 0 | 0 |  |
Amounts reclassified from accumulated other comprehensive income (loss), tax |  |  | 0 | 0 |  |
Other comprehensive income (loss), tax |  |  | 0 | 0 |  |
Unrealized Gains (Losses) on Marketable Securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications, tax |  |  | 2,405 | (896) |  |
Amounts reclassified from accumulated other comprehensive income (loss), tax | $ (150) | $ (126) | (152) | (335) |  |
Other comprehensive income (loss), tax |  |  | 2,253 | (1,231) |  |
Retirement Plans Prior Service Credit |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications, tax |  |  | 0 | 0 |  |
Amounts reclassified from accumulated other comprehensive income (loss), tax |  |  | (105) | (127) |  |
Other comprehensive income (loss), tax |  |  | $ (105) | $ (127) |  |

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