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Components of and Changes in Accumulated Other Comprehensive Income, Net of Related Income Taxes (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 627,095   $ 721,469  
Other comprehensive loss 4,548 $ 1,381 (4,933) $ 2,930
Ending Balance 649,121   649,121  
Unrealized Holding (Losses) Gains on Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     1,120  
Other comprehensive loss     1,237  
Ending Balance 2,357   2,357  
Foreign Currency Translation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (3,332)  
Other comprehensive loss     (6,170)  
Ending Balance (9,502)   (9,502)  
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (11,693)   (2,212)  
Other comprehensive loss     (4,933)  
Ending Balance $ (7,145)   $ (7,145)