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Inventories - Schedule of Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Components:
For manufacturing of systems	$ 51,323orbk_RawMaterialsGoodsInventory	$ 25,540orbk_RawMaterialsGoodsInventory
For servicing of systems	35,824orbk_RawMaterialsServicesInventory	27,756orbk_RawMaterialsServicesInventory
Inventory Gross	87,147us-gaap_InventoryGross	53,296us-gaap_InventoryGross
Work in process	25,266	11,843
Finished products	44,617	28,799
Inventory Net	$ 157,030us-gaap_InventoryNet	$ 93,938us-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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