Defined Contribution Plans, Pension and Other Post-Retirement Benefit Plans - Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S. Pension and Other Post-Retirement Benefit Plans
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate (as a percent)	3.87%	4.05%	3.73%
Expected return on plan assets (as a percent)	7.00%	7.50%	7.50%
Non-U.S. Pension Plans
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate (as a percent)	2.70%	3.90%	3.50%
Expected return on plan assets (as a percent)	3.70%	5.00%	4.60%