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Components of Inventories (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Inventory Disclosure [Abstract] |  |
Finished products | $ 125,498 | $ 107,595
Raw materials | 17,733 | 15,529
Total Inventories | $ 143,231 | $ 123,124

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