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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Compensation And Retirement Disclosure [Abstract]
Service cost	$ 303	$ 306	$ 611	$ 603
Interest cost	185	147	372	290
Expected return on plan assets	(394)	(307)	(793)	(606)
Amortization of actuarial losses	63	75	127	148
Net periodic pension cost	$ 157	$ 221	$ 317	$ 435

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