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Postretirement Benefit Plans - Weighted-Average Assumptions used to Determine Benefit Obligations (Detail)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cost Assumptions:      
Expected return on plan assets 8.00% 9.00% 9.00%
U.S. Pension Plans [Member]
     
Obligation Assumptions:      
Discount rate 4.10% 4.80%  
Rate of future compensation increase        
Cost Assumptions:      
Discount rate 4.80% 5.70%  
Expected return on plan assets 8.00% 9.00%  
International Pension Plan [Member]
     
Obligation Assumptions:      
Discount rate 3.10% 4.80%  
Rate of future compensation increase 3.20% 2.50%  
Cost Assumptions:      
Discount rate 4.80% 5.00%  
Expected return on plan assets 4.70% 4.80%