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Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Apr. 01, 2018 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |
Effective tax rate | (16.10%) | 9.20% |
Expense related to remeasurement of deferred tax assets and liabilities |  | $ 1.7 |
Tax savings due to the tax holiday | $ 2.1 | $ 3.0 |
Tax savings due to the tax holiday, per share | $ 0.01 | $ 0.01 |
Reduction in un recognized tax benefits | $ 22.4 |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 0.2 |  |
Accrued interest and penalties | 0.6 |  | $ 0.3
Interest and penalties related to income tax, expense (benefit) | 0.3 | $ 0.1 |
Discrete tax benefits | 30.2 | 6.0 |
Discrete tax benefit, Other |  | 0.7 |
Discrete tax benefits, stock based compensation | 3.8 | 7.6 |
Discrete tax benefits, net | 30.2 | 6.0 |
Income Tax Reconciliation Tax Contingencies Other Tax Expense | 0.5 | $ 0.6 |
Uncertain tax positions | 13.5 |  | $ 43.4
Net decrease in uncertain tax positions | 29.9 |  |
Release of Tax Reserve Discrete Tax Credit | 28.8 |  |
Research Tax Credit Carryforward [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net decrease in uncertain tax positions | 7.4 |  |
United States |  |  |
Income Taxes [Line Items] |  |  |
Discrete tax expense | 2.9 |  |
Net decrease in uncertain tax positions | $ 22.4 |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies. + References No definition available. + Details
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