Retirement Plans - Components of Net Periodic Benefit Cost for Domestic Retirement Plans (Detail) - United States - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1,674	$ 1,887	$ 1,980
Recognized net actuarial loss	2,091	1,849	1,646
Net periodic benefit cost	$ 3,765	$ 3,736	$ 3,626
Discount rate	3.25%	3.75%	4.00%