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Taxes (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
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense at U.S. federal statutory corporate tax rate | 21.00% | 21.00% | 21.00% | 21.00% |
Decrease in effective tax rate | 7.00% | 7.00% | 7.00% | 7.00% |
Decrease in effective tax rate for difference between deduction for tax purposes and compensation cost recognized from stock option exercises | 2.00% | 1.00% | 4.00% | 5.00% |
Increase in reserves for income taxes, net of deferred tax benefit | $ 952 |  | $ 952 |  |
Interest and penalties included in reserve |  |  | 155 |  |
Liability for uncertain tax positions | 9,119 |  | 9,119 |  |
Reserve for income taxes classified as a noncurrent iability | 8,091 |  | 8,091 |  | $ 7,106
Reserve for income taxes classified an noncurrent deferred tax assets | 1,028 |  | 1,028 |  |
Interest and penalties, gross | $ 1,019 |  | 1,019 |  |
Minimum decrease in income tax expense due to release in reserves |  |  | 1,250 |  |
Maximum decrease in income tax expense due to release in reserves |  |  | $ 1,350 |  |
Tax years open to examination by Internal Revenue Service |  |  | 2015 through 2018 |  |
Tax years open to examination by various taxing authorities for other entities |  |  | 2014 through 2018 |  |
Foreign Tax Authority | Revenue Commissioners, Ireland |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense at U.S. federal statutory corporate tax rate |  |  | 12.50% |  |
Foreign Tax Authority | State Administration of Taxation, China |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense at U.S. federal statutory corporate tax rate |  |  | 25.00% |  |
Domestic Tax Authority |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense at U.S. federal statutory corporate tax rate |  |  | 21.00% |  |

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