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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
		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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Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent.

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