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Pension Benefit Plan - Summarization of Components of Net Periodic Pension Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Service cost	$ 368	$ 303	$ 743	$ 611
Interest cost	159	185	321	372
Expected return on plan assets	(348)	(394)	(703)	(793)
Amortization of actuarial losses	199	63	402	127
Net periodic pension cost	$ 378	$ 157	$ 763	$ 317

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

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