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Weighted-Average Assumptions to Determine Net Periodic Postretirement Cost (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. postretirement plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.60%	4.20%	5.10%
Health care cost trend rate	6.50%	6.50%	7.00%
Foreign Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.77%	4.52%	5.17%
Health care cost trend rate	5.50%	5.18%	5.11%