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Inventories - Additional Information (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Inventory Disclosure [Abstract] |  |
Raw materials and supplies in inventory, percentage | 43.00% | 37.00%
Finished and semi-finished products in inventory, percentage | 57.00% | 63.00%
Lower of cost or market adjustments | $ 1.9 | $ 2.2

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