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Segmented Information - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2012
Center
Operations
Markets
Employee
Country
Aug. 31, 2012
Segment Reporting Information [Line Items]    
Number of manufacturing operations 313  
Number of product development, engineering and sales centres 88  
Number of countries in which entity operates 29  
Number of employees 119,000  
Number of primary markets 2  
Interest acquired in E-Car partnership   27.00%
E-Car [Member]
    
Segment Reporting Information [Line Items]    
Interest acquired in E-Car partnership   27.00%
Percentage of non-controlling interest in an equity accounted investment 73.00%