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Executive Benefit Agreements, Employee Savings Plans and Collective Bargaining Agreements - Life Insurance Premiums (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Compensation Related Costs [Abstract]      
Cost of life insurance premiums $ 14 $ 481 $ 1,040
Decreases (increases) in cash surrender values 162 (51) (586)
Net cost of life insurance premiums included in SG&A $ 176 $ 430 $ 454