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Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, net of tax      
Amortization of Prior Service Credit        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, net of tax $ 37 $ 61 $ 74 123
Accumulated Other Comprehensive Income (Loss)        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, net of tax $ 64 $ 260 $ 171 $ 769