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Executive Benefits Agreements and Employees Savings Plans - Life Insurance Premiums (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Compensation Related Costs [Abstract]      
Cost of life insurance premiums $ 1,040 $ 1,077 $ 1,006
Increases in cash surrender values (586) (714) (681)
Net cost of life insurance premiums included in SG&A $ 454 $ 363 $ 325