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Inventories - Inventories, Net of Reserves (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 58,082 | $ 59,164
In-process and finished | 96,883 | 92,231
Supplies | 41,079 | 39,020
Total | $ 196,044 | $ 190,415

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