Pension and Other Postretirement Benefits - Discount Rates and Weighted-Average Wage Increases Used to Determine the Benefit Obligations (Detail)	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Pension Plan [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Wage increases		3.00%
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.00%	2.45%
Minimum [Member] | Defined Benefit Pension Plan [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.23%	3.63%
Minimum [Member] | Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.09%	3.46%
Maximum [Member] | Defined Benefit Pension Plan [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.34%	3.72%
Maximum [Member] | Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.33%	3.69%