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Inventories - Schedule of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 4,330	$ 6,515
Work-in-process	7,317	6,606
Finished products	50,699	51,991
Deferred cost of sales	8,556ofix_DeferredCostOfSalesNetOfReserves	7,566ofix_DeferredCostOfSalesNetOfReserves
Total Inventory	$ 70,902us-gaap_InventoryNet	$ 72,678us-gaap_InventoryNet

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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