Pension and Other Postretirement Benefits - Discount Rates Used to Determine the Benefit Obligations (Detail)	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.05%	3.00%
Minimum [Member] | Defined Benefit Pension Plan [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.25%	4.23%
Minimum [Member] | Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.98%	4.09%
Maximum [Member] | Defined Benefit Pension Plan [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.31%	4.34%
Maximum [Member] | Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.35%	4.33%