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Executive Benefit Agreement, Employee Savings Plans and Collective Bargaining Agreements - Executive Benefit Agreements (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Compensation Related Costs [Abstract]    
Total undiscounted death benefit $ 2,500 $ 2,424
Total accrued death benefit $ 2,585 $ 2,533