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Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Interest income and interest expense $ (8,052) $ (5,981)
Reclassifications, net of tax 107 0
Unrealized Gains (Losses) on Marketable Securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, net of tax 70 (1,668)
Amortization of Prior Service Credit    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, net of tax [1] 37 61
Accumulated Other Comprehensive Income (Loss)    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, net of tax 107 769
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Marketable Securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Interest income and interest expense $ 70 $ (1,668)
[1] The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit. See Note R: “Retirement Plans.”