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Changes in Accumulated Other Comprehensive (Loss) Income (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 29, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amounts reclassified from accumulated other comprehensive income (loss), tax $ (145) $ (31)    
Foreign currency translation adjustments, tax 0 0 $ 0 $ 0
Unrealized (losses) gains on marketable securities, tax 988 36 946 (521)
Retirement plans prior service benefit, tax (1,124) (1,092) $ (1,124) $ (1,081)
Foreign Currency Translation Reclassification Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications, tax 0 0    
Amounts reclassified from accumulated other comprehensive income (loss), tax 0 0    
Other comprehensive income (loss), tax 0 0    
Unrealized (Losses) Gains on Marketable Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications, tax 187 577    
Amounts reclassified from accumulated other comprehensive income (loss), tax (145) (20)    
Other comprehensive income (loss), tax 42 557    
Amortization of Prior Service Credit        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications, tax 0 0    
Amounts reclassified from accumulated other comprehensive income (loss), tax 0 (11)    
Other comprehensive income (loss), tax $ 0 $ (11)