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Changes in Accumulated Other Comprehensive Income (Loss) Balances (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 05, 2015 | Jun. 29, 2014 | Jul. 05, 2015 | Jun. 29, 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 | $ (1,648) | $ 558 | (944) | $ 1,242 |  |
Other comprehensive income before reclassifications, tax |  |  |  | 0 |  |
Amounts reclassified from accumulated other comprehensive income, tax | (40) | (141) | (209) | (243) |  |
Amounts reclassified from accumulated other comprehensive income, tax | (42) | (42) | (85) | (85) |  |
Foreign currency translation adjustments, tax | 0 |  | 0 |  |  |
Unrealized gains (losses) on marketable securities, tax | 445 | 1,793 | 445 | 1,793 | $ 1,598 | $ 794
Retirement plans prior service benefit, tax | $ (538) | $ (369) | (538) | (369) | $ (453) | $ (284)
Unrealized Gains (Losses) on Marketable Securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), tax |  |  | (1,153) | 999 |  |
Retirement Plans Prior Service Benefit |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), tax |  |  | (85) | $ (85) |  |
Foreign currency translation reclassification adjustment |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), tax |  |  | $ 0 |  |  |

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