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Pension and Other Benefit Plans - Weighted-Average Assumed Discount Rate, Compensation Increases and Expected Long-Term Rate of Return on Plan Assets Used to Determine Net Pension Cost for US and International Plans (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 3.70% 4.20%  
US Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.20% 4.50% 4.15%
Compensation increases 4.00% 4.00% 4.00%
Return on plan assets 7.25% 7.25% 7.25%
International      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.13% 4.36% 4.07%
Compensation increases 4.81% 4.81% 4.79%
Return on plan assets 7.40% 7.40% 7.40%