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Weighted-Average Assumptions to Determine Net Periodic Postretirement Cost (Detail)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
U.S. postretirement plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.20% 5.10% 4.20%
Health care cost trend rate 6.50% 7.00% 7.50%
Foreign Postretirement Benefit Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.52% 5.17% 4.39%
Health care cost trend rate 5.18% 5.11% 6.47%