Employee Benefit Plans - Components of Net Periodic Defined Benefit Cost (Income) (Detail) - Defined Benefit Pension Plans - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 355	$ 474	$ 710	$ 948
Expected return on plan assets	(461)	(477)	(922)	(954)
Recognized actuarial losses	380	406	760	812
Total	$ 274	$ 403	$ 548	$ 806