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Inventories - Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 23,498us-gaap_InventoryRawMaterialsNetOfReserves $ 13,101us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 5,753us-gaap_InventoryWorkInProcessNetOfReserves 4,472us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 6,285us-gaap_InventoryFinishedGoodsNetOfReserves 8,121us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories $ 35,536us-gaap_InventoryNet $ 25,694us-gaap_InventoryNet