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Executive Benefit Agreements, Employee Savings Plans and Collective Bargaining Agreements - Life Insurance Policies (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Compensation Related Costs [Abstract]    
Total face value of life insurance policies $ 4,500 $ 4,670
Total cash surrender values of life insurance policies 1,804 2,270
Loans on cash surrender values (1,482) (1,409)
Net cash surrender values $ 322 $ 861