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Net Sales - Summary of Net Sales Disaggregated by Principal Markets (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Net sales: |  |  |  |
Net sales | $ 75,495 | $ 79,781 | $ 291,174 | $ 283,430
Chemical [Member] |  |  |  |
Net sales: |  |  |  |
Net sales | 75,495 | 79,781 | 291,174 | 283,430
Chemical [Member] | Agricultural Products [Member] |  |  |  |
Net sales: |  |  |  |
Net sales | 35,494 | 35,998 | 154,790 | 146,291
Chemical [Member] | Industrial Acids and Other Chemical Products [Member] |  |  |  |
Net sales: |  |  |  |
Net sales | 30,552 | 34,788 | 105,579 | 105,700
Chemical [Member] | Mining Products [Member] |  |  |  |
Net sales: |  |  |  |
Net sales | $ 9,449 | $ 8,995 | $ 30,805 | $ 31,439

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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