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Changes in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss), tax | $ (17) | $ (86) | $ (47) | $ (24) |  |
Reclassification of unrealized gains on equity securities, net of tax | (6) | (68) | (26) | 11 |  |
Foreign currency translation adjustments, tax | 0 | 0 | 0 | 0 | $ 0 | $ 0
Unrealized (losses) gains on marketable securities, tax | 709 | (511) | 709 | (511) | (521) | 1,815
Retirement plans prior service benefit, tax | (1,102) | (1,045) | (1,102) | (1,045) | $ (1,081) | $ (932)
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 |  |
Reclassification of income tax effects from the Tax Reform Act, net of tax |  |  |  | 0 |  |
Unrealized (Losses) Gains on Marketable Securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications, tax |  |  | 1,256 | (774) |  |
Amounts reclassified from accumulated other comprehensive income (loss), tax | (6) | (68) | 26 | 11 |  |
Other comprehensive income (loss), tax |  |  | 1,230 | (733) |  |
Reclassification of income tax effects from the Tax Reform Act, net of tax |  |  |  | (691) |  |
Reclassification of unrealized gains on equity securities, net of tax |  |  |  | (902) |  |
Amortization of 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 | $ (11) | $ (18) | (21) | (35) |  |
Other comprehensive income (loss), tax |  |  | $ (21) | (35) |  |
Reclassification of income tax effects from the Tax Reform Act, net of tax |  |  |  | (78) |  |
Reclassification of unrealized gains on equity securities, net of tax |  |  |  | $ 0 |  |

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