Pensions and Postretirement Benefits Other than Pensions - Components of Net Periodic Benefit Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8,906	$ 10,363
Interest cost	50,560	48,001
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,573	1,948	$ 2,003
Interest cost	9,887	9,251	10,063
Amortization of prior service credit	(409)	(541)	(566)
Net periodic benefit cost	11,051	10,658	11,500
United States | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	8,906	10,363	9,860
Interest cost	39,499	36,840	39,251
Expected return on plan assets	(48,034)	(54,035)	(54,058)
Amortization of actuarial loss	32,432	32,939	37,122
Amortization of prior service credit	703	0	0
Net periodic benefit cost	33,506	26,107	32,175
International | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	11,061	11,161	11,525
Expected return on plan assets	(11,554)	(12,073)	(11,262)
Amortization of actuarial loss	3,411	4,264	5,448
Amortization of prior service credit	309	0	0
Effect of settlements	4,262
Net periodic benefit cost	$ 7,489	$ 3,352	$ 5,711