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Post-Retirement and Other Long-Term Employees Benefits - Weighted Average Assumptions Used in Determination of Benefit Obligation and Plan Asset (Detail)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Discount rate 3.43% 4.14%  
Salary increase rate 2.92% 2.99%  
Expected long-term rate of return on funds for the pension expense of the year 4.43% 4.57%  
Net periodic benefit cost, Discount rate 4.14% 4.68% 5.11%
Net periodic benefit cost, Salary increase rate 2.99% 3.13% 3.08%
Net periodic benefit cost, Expected long-term rate of return on funds for the pension expense of the year 4.57% 4.99% 5.28%