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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Compensation And Retirement Disclosure [Abstract]      
Discount rate 3.83% 3.43%  
Salary increase rate 2.82% 2.92%  
Expected long-term rate of return on funds for the pension expense of the year 4.88% 4.43%  
Net periodic benefit cost, Discount rate 3.43% 4.14% 4.68%
Net periodic benefit cost, Salary increase rate 2.92% 2.99% 3.13%
Net periodic benefit cost, Expected long-term rate of return on funds for the pension expense of the year 4.43% 4.57% 4.99%