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Pension Benefit Plan - Summarization of Components of Net Periodic Pension Cost (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Service cost	$ 375	$ 308
Interest cost	162	187
Expected return on plan assets	(355)	(399)
Amortization of actuarial losses	203	64
Net periodic pension cost	$ 385	$ 160

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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