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Summary of Significant Accounting Policies (Details) | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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Navistar [Member] |  |  |
Sales Revenue, Goods, Net, Percentage | 18.00% | 24.00% | 24.00%
Deere [Member] |  |  |
Sales Revenue, Goods, Net, Percentage | 13.00% | 15.00% | 14.00%

X
- Definition The percentage of net product revenue to total net revenue from the sale of goods as of year end. + References No definition available. + Details
Name: | us-gaap_SalesRevenueGoodsNetPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant