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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%