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Executive Benefit Agreements, Employee Savings Plans and Collective Bargaining Agreements - Executive Benefit Agreements (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Compensation Related Costs [Abstract]    
Total undiscounted death benefits $ 4,208 $ 4,501
Total accrued death benefits 4,007 4,040
Total undiscounted executive benefits 201 913
Total accrued executive benefits $ 168 $ 564