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Employee Benefit Plans - Summary of Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Amounts recognized in accumulated comprehensive income:    
Accumulated net actuarial (gain) loss $ (235) $ 465
Income tax benefit (88) (199)
Accumulated other comprehensive (benefit) loss [1] $ (323) $ 266
[1] Tax benefit was $(88) and $(199) for the years ended December 31, 2017 and 2016, respectively, and $0 for 2015.