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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Compensation And Retirement Disclosure [Abstract]
Service cost	$ 307	$ 368	$ 617	$ 743
Interest cost	108	159	216	321
Expected return on plan assets	(407)	(348)	(817)	(703)
Amortization of actuarial losses	235	199	472	402
Net periodic pension cost	$ 243	$ 378	$ 488	$ 763

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

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