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Changes in Accumulated Other Comprehensive Income Balances (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 03, 2016 | Apr. 05, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income before reclassifications, tax | $ 0 |  |  |
Other comprehensive income (loss) before reclassifications, net of tax | 1,253 | $ 704 |  |
Amounts reclassified from accumulated other comprehensive income, tax | 11 | (169) |  |
Amounts reclassified from accumulated other comprehensive income, tax | (46) | (42) |  |
Foreign currency translation adjustments, tax | 0 |  | $ 0 |
Unrealized gains on marketable securities, tax | 805 | 2,133 | (459) | $ 1,598
Retirement plans prior service benefit, tax | (668) | (495) | $ (622) | $ (453)
Foreign currency translation reclassification adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), tax | 0 |  |  |
Unrealized Gains (Losses) on Marketable Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), tax | 1,264 |  |  |
Retirement Plans Prior Service Credit |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), tax | $ (46) | $ (169) |  |

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