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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Inventory Disclosure [Abstract] |  |
Finished goods | $ 43,212 | $ 39,048
Raw materials | 43,882 | 44,475
Total FIFO inventories | 87,094 | 83,523
Reserve to adjust inventories to LIFO value | (16,821) | (16,821)
Total LIFO inventories | $ 70,273 | $ 66,702

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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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