Employee Benefits - Pension and Other Defined Contribution Retirement Plan Expenses (Detail) - Pension Plans - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 399	$ 474	$ 1,199	$ 1,422
Interest cost on projected benefit obligation	4,263	5,453	12,789	16,359
Expected return on plan assets	(7,082)	(6,983)	(21,248)	(20,949)
Net amortization and deferrals	1,857	1,276	5,573	3,827
Net periodic benefit (income) cost	(563)	220	(1,687)	659
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	5,940	4,873	17,820	14,619
Interest cost on projected benefit obligation	3,245	4,435	9,736	13,305
Expected return on plan assets	(11,614)	(10,904)	(34,842)	(32,712)
Net amortization and deferrals	3,834	2,922	11,502	8,766
Net periodic benefit (income) cost	$ 1,405	$ 1,326	$ 4,216	$ 3,978