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Employee Benefit Plans - Summary of Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Amounts recognized in accumulated comprehensive income: |  |  |  |
Accumulated net actuarial gain |  | $ 235 | $ 235 |
Income tax (expense) benefit |  | (86) | 88 |
Accumulated other comprehensive gain | [1] | $ 149 | $ 323 | $ (266)
[1] | Tax expense (benefit) was $86, $(88) and $(199) for the years ended December 31, 2018, 2017 and 2016, respectively.

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