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Pension Plans - 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	$ 47	$ 84
Interest cost	354	333
Expected return on plan assets	(488)	(496)
Recognized net actuarial loss	125	121
Net periodic pension cost (benefit)	$ 38	$ 42

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

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