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Schedule of One Percent Point Change in assumed Health Care Cost Trends Rate (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure  
Effect of one percentage point increase on total service and interest cost components $ 6
Effect of one percentage point increase on postretirement benefit obligations 139
Effect of one percentage point decrease on total service and interest cost components (6)
Effect of one percentage point decrease on postretirement benefit obligations $ (133)