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Executive Benefit Agreements, Employee Savings Plans and Collective Bargaining Agreements - Life Insurance Policies (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Compensation Related Costs [Abstract]    
Total face value of life insurance policies $ 4,670 $ 21,242
Total cash surrender values of life insurance policies 2,270 5,007
Loans on cash surrender values (1,409) (1,288)
Net cash surrender values $ 861 $ 3,719