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Changes in Accumulated Other Comprehensive (Loss) Income (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 02, 2017 | Apr. 03, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income, tax | $ (102) | $ (35) |  |
Foreign currency translation adjustments, tax | 0 | 0 | $ 0 | $ 0
Unrealized gains on marketable securities, tax | 565 | 805 | 209 | (459)
Retirement plans prior service benefit, tax | (816) | (668) | $ (778) | $ (622)
Foreign currency translation reclassification adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive (loss) income before reclassifications, tax | 0 | 0 |  |
Amounts reclassified from accumulated other comprehensive income, 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 (loss) income before reclassifications, tax | 420 | 1,253 |  |
Amounts reclassified from accumulated other comprehensive income, tax | (64) | 11 |  |
Other comprehensive income (loss), tax | 356 | 1,264 |  |
Amortization of prior service credit |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive (loss) income before reclassifications, tax | 0 | 0 |  |
Amounts reclassified from accumulated other comprehensive income, tax | (38) | (46) |  |
Other comprehensive income (loss), tax | $ (38) | $ (46) |  |

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