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Post-Employment and Other Long-Term Employees Benefits - Weighted Average Assumptions Used in Determination of Benefit Obligation and Plan Assets (Detail)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]      
Discount rate 3.19% 3.03%  
Salary increase rate 3.07% 2.65%  
Expected long-term rate of return on funds for the pension expense of the year 4.44% 4.76%  
Net periodic benefit cost, Discount rate 3.03% 3.83% 3.43%
Net periodic benefit cost, Salary increase rate 2.65% 2.82% 2.92%
Net periodic benefit cost, Expected long-term rate of return on funds for the pension expense of the year 4.76% 4.88% 4.43%