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Summary of Percentage of Revenues from Major Customers (Detail) (Sales) | 12 Months Ended
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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%

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