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Inventories - Schedule of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 5,220us-gaap_InventoryRawMaterialsNetOfReserves $ 6,515us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 7,412us-gaap_InventoryWorkInProcessNetOfReserves 6,606us-gaap_InventoryWorkInProcessNetOfReserves
Finished products 51,190us-gaap_InventoryFinishedGoodsNetOfReserves 51,991us-gaap_InventoryFinishedGoodsNetOfReserves
Deferred cost of sales 6,855ofix_DeferredCostOfSalesNetOfReserves 7,566ofix_DeferredCostOfSalesNetOfReserves
Total Inventory $ 70,677us-gaap_InventoryNet [1] $ 72,678us-gaap_InventoryNet
[1] Unaudited