Employee Benefit Plans - Components of Net Periodic Defined Benefit Cost (Income) (Detail) - Defined Benefit Pension Plans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1,808	$ 2,072	$ 2,302
Expected return on plan assets	(3,043)	(2,770)	(2,911)
Amortization of actuarial (gain) loss	1,937	1,704	1,474
Settlement cost		87
Total	$ 702	$ 1,093	$ 865