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Summary of Percentage of Revenues from Major Customers (Detail) (Sales)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Ford Motor Company
      
Revenue, Major Customer [Line Items]      
Percentage of revenues from major customers 21.90% 19.80% 19.40%
General Motors
      
Revenue, Major Customer [Line Items]      
Percentage of revenues from major customers 21.90% 21.10% 18.80%
BMW
      
Revenue, Major Customer [Line Items]      
Percentage of revenues from major customers 10.00% 10.60% 11.60%