Pensions and Postretirement Benefits Other than Pensions - Weighted Average Assumptions Used to Determine Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.78%	3.70%
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.12%	4.05%
United States | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.09%	4.05%
United States | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.12%	4.05%
Foreign Plan | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate	1.99%	2.80%
Foreign Plan | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	0.00%	0.00%