Employee Benefit Plans - Components of Net Periodic Defined Benefit Cost (Income) (Detail) - Defined Benefit Pension Plans - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 474	$ 372	$ 1,422	$ 1,116
Expected return on plan assets	(477)	(590)	(1,431)	(1,770)
Recognized actuarial losses	406	365	1,218	1,095
Total	$ 403	$ 147	$ 1,209	$ 441