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Customer Claims - Additional Information (Detail) - Surfactants [Member] | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Dec. 31, 2017 USD ($) Claim | Dec. 31, 2016 Claim | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Number of customer claims | Claim |  |  | 2 |
Insurance claims reserve amount | $ |  |  |  | $ 7,367,000
Claim paid | $ | $ 703,000 | $ 2,709,000 |  |
Number of claims and reversed | Claim |  | 1 |  |

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI http://asc.fasb.org/extlink&oid=123368208&loc=d3e12565-110249 + Details
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