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Adoption of ASC 606 - Summary of Net Sales Disaggregated by Principal Markets (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 94,730 | $ 79,781 | $ 103,199 | $ 100,450 | $ 88,917 | $ 92,390 | $ 122,853 | $ 123,344 | $ 378,160 | $ 427,504 | $ 374,585
Chemical [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 378,160 | 427,504 | 374,585
Chemical [Member] | Agricultural Products [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 187,164 | 184,054 | 166,180
Chemical [Member] | Industrial Acids and Other Chemical Products [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 148,598 | 196,029 | 155,744
Chemical [Member] | Mining Products [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 42,398 | 38,854 | 43,532
Chemical [Member] | Other Products [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | $ 8,567 | $ 9,129

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