Pension and Postretirement Benefits - Weighted-Average Assumptions Used to Measure Defined Benefit Pension and Other Postretirement Plans (Detail)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Pension Plans [Member] | U.S. Pension Plans [Member]
Weighted average assumptions used to determine net periodic benefit obligations at December 31,
Discount rate		4.10%	3.60%
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate		3.60%	4.10%
Expected return on plan assets	[1]	4.00%	4.20%
Pension Plans [Member] | Non-U. S. Pension Plans [Member]
Weighted average assumptions used to determine net periodic benefit obligations at December 31,
Discount rate		2.10%	3.95%
Rate of compensation increase	[2]	1.60%
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate		2.10%	4.10%
Expected return on plan assets	[1]	3.50%	4.70%
Rate of compensation increase	[2]	1.60%
Other Postretirement Plans [Member]
Weighted average assumptions used to determine net periodic benefit obligations at December 31,
Discount rate		4.10%
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate		4.10%

[1] The expected long-term rate of return on plan assets was derived using historical returns by asset category and expectations of future performance.

[2] The rate of compensation increase relates solely to the defined benefit plans that factor compensation increases into the valuation.