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Inventory - Additional Information (Detail)
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12 Months Ended | |
|---|---|---|
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Dec. 31, 2012
D
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Dec. 31, 2011
D
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| Inventories [Line Items] | ||
| Inventory rotation days | 81 | |
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New Inventory Rotation Methodology
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| Inventories [Line Items] | ||
| Inventory rotation days | 45 | 30 |