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Other Financial Statement Information - Inventories - Net (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 41,354 | $ 37,535
Work-in-process | 9,781 | 9,057
Finished Goods | 32,889 | 35,629
Inventory, gross | 84,024 | 82,221
Excess of current cost over LIFO cost | (2,964) | (2,784)
Noncurrent portion of inventory | (5,385) | (4,953)
Inventories - net | $ 75,675 | $ 74,484

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