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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