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Long-Term Employee Benefit Liabilities - Summary of Weighted Average Discount Rates Used in Measuring Company's Projected Retirement Medical Benefit Obligations and Net Periodic Benefit Cost (Detail) (Retirement Medical Benefits Plans [Member])
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Retirement Medical Benefits Plans [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Retirement medical benefit obligations 4.50% 3.60% 4.20%
Net periodic benefit cost 3.60% 4.20% 5.40%
Health care cost inflation 7.70% 8.00% 9.20%