Retirement Benefit Plans - Weighted Average Actuarial Assumptions Used to Determine Projected Benefit Obligation for Defined Benefit Retirement Plans (Detail)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Discount rate	3.78%	4.32%	4.36%
Rate of compensation increase	3.29%	3.29%	3.29%
Foreign-based Defined Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Discount rate	1.27%	1.41%	1.86%
Rate of compensation increase	2.19%	2.08%	2.02%