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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 474	$ 372	$ 948	$ 744
Expected return on plan assets	(477)	(590)	(954)	(1,180)
Recognized actuarial losses	406	365	812	730
Total	$ 403	$ 147	$ 806	$ 294