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Weighted-Average Assumptions to Determine Net Periodic Postretirement Cost (Detail) - Postretirement Benefit Plans
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
U.S. Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.14% 4.60% 4.20%
Health care cost trend rate 6.50% 6.50% 6.50%
Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.55% 4.77% 4.52%
Health care cost trend rate 5.50% 5.50% 5.18%