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Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Inventory Disclosure [Line Items]
Raw materials and component parts	$ 136,868	$ 139,229
Work-in-process	36,915	33,025
Finished goods	65,792	62,696
Total	$ 239,575	$ 234,950

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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