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Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Apr. 01, 2018 | Dec. 31, 2018
Income Tax [Line Items] |  |  |
Income tax expense at U.S federal statutory corporate tax rate | 21.00% | 21.00% |
Foreign tax rate differential | 9.00% | 7.00% |
Discrete tax benefit related to stock option exercises | 8.00% | 13.00% |
Increase in reserves for income taxes, net of deferred tax benefit | $ 622 |  |
Interest and penalties included in reserve | 90 |  |
Liability for uncertain tax positions | 8,776 |  |
Reserve for income taxes classified as a noncurrent iability | 7,748 |  | $ 7,106
Reserve for income taxes classified an noncurrent deferred tax assets | 1,028 |  |
Interest and penalties, gross | 940 |  |
Minimum decrease in income tax expense due to release in reserves | 1,300 |  |
Maximum decrease in income tax expense due to release in reserves | $ 1,400 |  |
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 | Ireland |  |  |
Income Tax [Line Items] |  |  |
Income tax expense at U.S federal statutory corporate tax rate | 12.50% |  |
Foreign tax authority | China |  |  |
Income Tax [Line Items] |  |  |
Income tax expense at U.S federal statutory corporate tax rate | 25.00% |  |
Foreign tax authority | Domestic Tax Authority [Member] |  |  |
Income Tax [Line Items] |  |  |
Income tax expense at U.S federal statutory corporate tax rate | 21.00% |  |

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