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Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Inventory Disclosure [Line Items] |  |
Raw materials and component parts | $ 147,177 | $ 155,577
Work-in-process | 38,467 | 40,506
Finished goods | 63,920 | 58,175
Total | $ 249,564 | $ 254,258

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