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 |